Capacitor components now label their terminal nodes as '+' and '-' instead of '1' and '2' when 'Polarized' property is ticked

Diode components now label their terminal nodes as 'A' (anode) and 'K' (cathode) instead of '1' and '2'
<org.diylc.appframework.update.Change> <changeType>IMPROVEMENT</changeType> <description>When saving building blocks, present a drop down list with most recently used building blocks for quick selection</description> </org.diylc.appframework.update.Change>
2026-11-07 20:34:55 +10:00 · 2026-09-04 13:13:03 +02:00 · 2026-09-03 22:29:34 +02:00 · 2026-09-03 21:39:14 +02:00 · 2026-09-03 19:14:32 +02:00 · 2026-09-03 19:12:17 +02:00
644 changed files with 37260 additions and 29802 deletions
@@ -14,10 +14,10 @@ jobs:
      - name: Checkout code
        uses: actions/checkout@v3

-      - name: Set up JDK 17
+      - name: Set up JDK 21
        uses: actions/setup-java@v3
        with:
-          java-version: '17'
+          java-version: '21'
          distribution: 'temurin'
          cache: maven

@@ -1,3 +1,4 @@
 {
-    "java.configuration.updateBuildConfiguration": "interactive"
+    "java.configuration.updateBuildConfiguration": "disabled",
+    "java.compile.nullAnalysis.mode": "disabled"
 }
@@ -1,63 +1,95 @@
-<h3><a name="News"></a>Introduction<a href="#Introduction" class="section_anchor"></a></h3>
-<p align="justify">
-DIY Layout Creator (DIYLC) is a specialized software tool designed for hobbyists and electronics enthusiasts to create circuit layouts on stripboard, perfboard, PCB, and point-to-point wiring. It provides an intuitive, drag-and-drop interface for placing components, arranging connections, and visualizing circuit designs before assembly. With a built-in component library and customization options, it allows users to design layouts with precision and clarity. The software is particularly useful for designing, analyzing, and debugging guitar wiring diagrams, helping musicians and builders plan and troubleshoot custom wiring configurations for pickups, switches, and controls. Its versatility makes it an ideal solution for DIY electronics projects, prototyping, and documentation.</p>
-<br>
-<a href="https://github.com/bancika/diy-layout-creator/releases/latest">Click here</a> to get the latest version for all platforms.</a><br>
-<a href="https://github.com/bancika/diy-layout-creator/tree/wiki">Click here</a> to read the user documentation as well as developer documentation.<br>
-<br>
-<b>Mac users</b>: in most instances, the Gatekeeper will block DIYLC and mark it as damaged because it's a 3rd party app from an independent vendor (me). <a href="[https://support.apple.com/en-us/HT202491](https://support.apple.com/kb/ph18657?locale=en_US)">This document</a> covers how to allow DIYLC on your Mac.
+### 🛠️ Introduction

-<h3><a name="Samples"></a>Samples<a href="#Samples" class="section_anchor"></a></h3>
+DIY Layout Creator (DIYLC) is a specialized software tool designed for hobbyists and electronics enthusiasts to create circuit layouts on stripboard, perfboard, PCB, and point-to-point wiring. 

-<h4>Point-to-point tube amplifier</h4>
-<p align="center"><a href="http://diy-fever.com/wordpress/wp-content/gallery/diylc/slo.png" rel="nofollow"><img src="https://diy-fever.com/wordpress/wp-content/gallery/diylc/cache/slo.png-nggid041072-ngg0dyn-450x350-00f0w010c010r110f110r010t010.png"></a></p>
-<h4>Guitar wiring</h4>
-<p align="center"><a href="http://diy-fever.com/wordpress/wp-content/gallery/diylc/travelcaster.png" rel="nofollow"><img src="https://diy-fever.com/nextgen-image/1073/450x350/34b70d759e46422208d61e376b4633dc"></a></p>
-<h4>PCB tube amplifier</h4>
-<p align="center"><a href="http://diy-fever.com/wordpress/wp-content/gallery/diylc/iic.png" rel="nofollow"><img src="https://diy-fever.com/nextgen-image/1070/450x350/ccb592ec5828b6f5bc75e840438918f1"></a></p>
-<h4>Perfboard guitar effect</h4>
-<p align="center"><a href="http://diy-fever.com/wordpress/wp-content/gallery/diylc/split.png" rel="nofollow"><img src="https://diy-fever.com/nextgen-image/1069/450x350/358e43165de40e9c4043726c9efde4a7"></a></p>
+It provides an intuitive, drag-and-drop interface for placing components, arranging connections, and visualizing circuit designs before assembly. With a built-in component library and customization options, it allows users to design layouts with precision and clarity. 

-<h3><a name="Key Features"></a>Features<a href="#Features" class="section_anchor"></a></h3>
-<ul>
-   <li>platform independence, will run on any machine having Java JRE/JDK 8 or newer </li>
-   <li>easy to use interface, most of the operations can be done using mouse </li>
-   <li>draw PCB, perfboard, stripboard or point-to-point circuit layouts layouts, schematics and guitar wiring diagrams </li>
-   <li>high flexibility, has the API to allow plug-ins and new components to be added</li>
-   <li>improved performance and reduced memory consumption compared to the previous versions </li>
-   <li>save default values for each property of a component individually </li>
-   <li>group components together and treat them as one, e.g. move, edit or delete </li>
-   <li>export the output to image, PDF or printer </li>
-   <li>export PCB trace mask suitable for toner transfer </li>
-   <li>export PCB designs to Gerber for fabrication </li>
-   <li>create a Bill of Materials as a part of the project or export it to few different file formats </li>
-   <li>analyze guitar wirings and show detailed pickup configuration in each switch configuration</li>
-   <li>zoom in/out feature </li>
-   <li>configurable grid spacing on the project level </li>
-   <li>auto update checks for new versions </li>
-   <li>import files created with older versions of the application </li>   
-   <li>cloud feature - share your projects, search through the cloud and download other users' projects </li>
-   <li>highlight connected areas to simplify validation and circuit debugging</li>
-   <li>analyze guitar wiring diagrams and visualize pickup wirings for each switch configuration</li>
-   <li>export circuits to SPICE-compatible netlists</li>
-</ul>
-<p>To report bugs or request a new feature go to <a href="https://github.com/bancika/diy-layout-creator/issues" rel="nofollow">Issues</a> page and create a new issue describing your problem or request. </p>
-<p>To join the discussion or request technical assistance, use the dedicated <a href="http://groups.google.com/group/diy-layout-creator" rel="nofollow">Discussion Group</a>. </p>
-<h3><a name="Want_to_contribute?"></a>Want to contribute?<a href="#Want_to_contribute?" class="section_anchor"></a></h3>
-<p align="justify"><strong>DIYLC is provided free of charge and can be used and redistributed freely. Please note that it takes a lot of time and effort to build, test and maintain it and to interact with the growing community of users. If you find DIYLC useful and want to support further development, these are some of the ways you can contribute</strong></p>
-<ul>
-   <li><a href="https://www.patreon.com/c/user?u=5213116">Become a Patreon.</a></li>
-   <li><a href="https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=U6GLS8HLTSU88">Make a one-time donation with PayPal.</a></li>
-   <li>Help with adding the information to the <a href="https://github.com/bancika/diy-layout-creator/blob/wiki/Manual.md">user manual</a> or other project documentation.</li>
-   <li>Extend the component base, read <a href="https://github.com/bancika/diy-layout-creator/blob/wiki/ComponentAPI.md" rel="nofollow">this wiki</a> to learn how to create new components. </li>
-   <li>Add a new functionality though plug-ins, read <a href="https://github.com/bancika/diy-layout-creator/blob/wiki/PluginAPI.md" rel="nofollow">this wiki</a> to learn how to create new plug-ins. </li>
-</ul>
-<!--<p align="center"><a href="https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=U6GLS8HLTSU88" rel="nofollow"><img src="https://www.paypal.com/en_US/i/btn/btn_donateCC_LG.gif"></a> </p>-->
-<h3><a name="License_information"></a>License information<a href="#License_information" class="section_anchor"></a></h3>
-<p>Source code is released under <a href="https://www.gnu.org/licenses/gpl-3.0.txt">GNU General Public License version 3</a>. Contact the project owner to obtain a license in case you plan to use the source code, or any part of it, in commercial purposes. </p>
-<p></p>
-<h3><a name="Credits"></a>Credits<a href="#Credits" class="section_anchor"></a></h3>
-<ul>
-   <li>Big thanks goes to folks from the following online communities for contributing ideas and helped test the app: <a href="http://www.diystompboxes.com/smfforum/" rel="nofollow">DIY Stompboxes</a>, <a href="http://ax84.com/bbs" rel="nofollow">AX84</a> and <a href="http://freestompboxes.org" rel="nofollow">Free Stompboxes</a>. </li>
-   <li>I'm happy to report that DIYLC 4 is the fastest version ever. <a href="http://www.yourkit.com/java/profiler/index.jsp" rel="nofollow">YourKit Java Profiler</a> helped tremendously with memory and performance profiling and pointed me to places in the code that took longer to run or consumed more memory than I'd like them to. I strongly recommend this tool to anyone developing Java or .NET applications because it helps finding bottlenecks and allocation hot-spots very fast.<br><br>YourKit is kindly supporting open source projects with its full-featured Java Profiler.<br>YourKit, LLC is the creator of innovative and intelligent tools for profiling Java and .NET applications.<br>Take a look at YourKit's leading software products: <a href="http://www.yourkit.com/java/profiler/index.jsp" rel="nofollow">YourKit Java Profiler</a> and <a href="http://www.yourkit.com/.net/profiler/index.jsp" rel="nofollow">YourKit .NET Profiler</a> </li>
-</ul>
+🎸 **Perfect for guitar pedal builders, guitar, synth, audio and HAM enthusiasts!** DIYLC is particularly useful for designing, analyzing, and debugging guitar wiring diagrams, helping musicians and builders plan and troubleshoot custom wiring configurations for pickups, switches, and controls. Its versatility makes it an ideal solution for DIY electronics projects, prototyping, and documentation.
+
+### 🚀 Quick Links
+* **[⬇️ Download the latest release](https://github.com/bancika/diy-layout-creator/releases/latest)** for all platforms.
+* **[📄 Read the Wiki](https://github.com/bancika/diy-layout-creator/tree/wiki)** for free user and developer documentation.
+
+> 🍎 **Mac users:** Gatekeeper may block DIYLC since it's from an independent developer. [Read this guide](https://support.apple.com/kb/ph18657?locale=en_US) on how to easily allow DIYLC on your Mac.
+
+---
+
+### 📖 The Official DIYLC Guide
+
+<a href="https://www.diy-fever.com/diylc-book">
+  <img src="https://www.diy-fever.com/diylc/book/book_v1_thumb.png" alt="DIYLC Official Guide" width="220" align="left" style="margin-right: 20px; margin-bottom: 20px;">
+</a>
+
+**Master DIY Layout Creator and streamline your design workflow!**
+
+The **Official DIYLC Guide (v1.0)** is a comprehensive 174-page eBook that goes way beyond the basics. It features step-by-step design workflows for everything from multi-layer PCBs to hot-rodded point-to-point tube amps. Learn to master advanced tools like the Virtual Multimeter, Netlist generation, the Guitar Wiring Analyzer, and the new AI Assistant.
+
+🎉 **Launch Special:** Get **40% off** during our 14-day introductory sale! Buying v1.0 guarantees you free lifetime updates as the app evolves.
+
+👉 **[Click here to grab your copy!](https://www.diy-fever.com/diylc-book)**
+
+*Active Patreon supporters get an additional 50% off or a completely free copy. Check the [Patreon feed](https://www.patreon.com/c/user?u=5213116) for your VIP link!*
+
+<br clear="all">
+
+---
+
+### 🖼️ Gallery & Samples
+
+<p align="center">
+  <img src="https://diy-fever.com/wordpress/wp-content/gallery/diylc/slo.png" width="48%" alt="Point-to-point tube amplifier">
+  <img src="https://diy-fever.com/wordpress/wp-content/gallery/diylc/travelcaster.png" width="48%" alt="Guitar wiring">
+  <br>
+  <sup><i>Left: Point-to-point tube amplifier &nbsp; | &nbsp; Right: Guitar wiring</i></sup>
+  <br><br>
+  <img src="https://diy-fever.com/wordpress/wp-content/gallery/diylc/iic.png" width="48%" alt="PCB tube amplifier">
+  <img src="https://diy-fever.com/wordpress/wp-content/gallery/diylc/split.png" width="48%" alt="Perfboard guitar effect">
+  <br>
+  <sup><i>Left: PCB tube amplifier &nbsp; | &nbsp; Right: Perfboard guitar effect</i></sup>
+</p>
+
+---
+
+### ✨ Key Features
+* 🆓 **Free for Life**: A true old-school offline app—the app you download is yours forever and the files you created are yours.
+* 💻 **Platform Independence:** Runs locally on any machine capable of running Java JRE/JDK 21 or newer.
+* 🖱️ **Intuitive UI:** Easy-to-use interface; most operations can be done seamlessly with a mouse.
+* 🎛️ **Versatile Designs:** Draw PCB, perfboard, stripboard, or point-to-point layouts, schematics, guitar wiring diagrams or custom faceplates.
+* 🔌 **Highly Extensible:** API allows custom plug-ins and new components to be added easily.
+* 🚀 **Optimized:** Improved performance and reduced memory consumption.
+* 💾 **Smart Defaults:** Save default values individually for each component property.
+* 🖨️ **Export Options:** Export outputs to image, PDF, or printer.
+* 📄 **Toner Transfer & Gerber:** Export PCB trace masks for toner transfer or Gerber files for fabrication.
+* 📋 **Bill of Materials:** Create a BOM within the project or export to multiple file formats.
+* 🔍 **Guitar Wiring Analysis:** Analyze guitar wirings and visualize detailed pickup configurations for each switch state.
+* ☁️ **Cloud Integration:** Share your projects, search the cloud, and download other users' designs.
+* 🤖 **AI Powered:** Features a built-in AI assistant to help answer general electronics questions, guide you through DIYLC's usability, and provide insights or troubleshooting for the specific circuit you are designing.
+* ⚡ **Circuit Analysis:** Various tools aimed to help you debug and analyze your circuits.
+* 📈 **SPICE Netlists:** Export circuits directly to SPICE-compatible netlists.
+
+---
+
+### 🐛 Support & Community
+* **Found a bug or have a feature request?** Head over to the [Issues page](https://github.com/bancika/diy-layout-creator/issues) to open a ticket.
+* **Need technical assistance or want to chat?** Join the discussion in our [Google Group](http://groups.google.com/group/diy-layout-creator).
+
+---
+
+### ❤️ Want to contribute?
+DIYLC is provided free of charge and can be used and redistributed freely. Building, testing, and maintaining this tool—while supporting our growing community—takes a significant amount of time and effort. 
+
+If you find DIYLC useful, here are the best ways you can support its future development:
+* 🧡 **[Become a Patreon](https://www.patreon.com/c/user?u=5213116):** Join the inner circle for exclusive perks.
+* 📖 **[Purchase the Official DIYLC Guide](https://www.diy-fever.com/diylc-book):** Level up your layout skills while directly supporting the app!
+* ☕ **[Make a PayPal donation](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=U6GLS8HLTSU88):** A one-time donation helps keep the lights on.
+* 📝 **Documentation:** Help us improve the [user manual](https://github.com/bancika/diy-layout-creator/blob/wiki/Manual.md) or other project docs.
+* 🧩 **Extend the App:** Read the [Component API Wiki](https://github.com/bancika/diy-layout-creator/blob/wiki/ComponentAPI.md) to add new components, or the [Plugin API Wiki](https://github.com/bancika/diy-layout-creator/blob/wiki/PluginAPI.md) to create new plug-ins.
+
+---
+
+### 📜 License Information
+The source code is released under the [GNU General Public License version 3](https://www.gnu.org/licenses/gpl-3.0.txt). Please contact the project owner to obtain a commercial license if you plan to use the source code, or any part of it, for commercial purposes.
+
+### 🙌 Credits
+* Huge thanks to the online communities that contributed ideas and helped test the app: [DIY Stompboxes](http://www.diystompboxes.com/smfforum/), [AX84](http://ax84.com/bbs), and [Free Stompboxes](http://freestompboxes.org).
+* DIYLC is highly optimized thanks to [YourKit Java Profiler](http://www.yourkit.com/java/profiler/index.jsp). YourKit is kindly supporting open-source projects with its full-featured Java Profiler, which helped tremendously with memory and performance profiling. *YourKit, LLC is the creator of innovative and intelligent tools for profiling Java and .NET applications.*
@@ -147,3 +147,10 @@ buildNumber.properties

 # Avoid ignoring Maven wrapper jar file (.jar files are usually ignored)
 !/.mvn/wrapper/maven-wrapper.jar
+
+######################
+######  Custom  ######
+######################
+
+# Deployment folder
+deploy/
@@ -1,8 +1,10 @@
 <component name="ProjectRunConfigurationManager">
  <configuration default="false" name="DIYLCStarter" type="Application" factoryName="Application" nameIsGenerated="true">
+    <option name="ALTERNATIVE_JRE_PATH" value="temurin-21" />
+    <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="true" />
    <option name="MAIN_CLASS_NAME" value="org.diylc.DIYLCStarter" />
    <module name="diylc-swing" />
-    <option name="VM_PARAMETERS" value="-Xms1024m -Xmx4096m -Dsun.java2d.uiScale=1.5 -Dorg.diylc.scriptRun=true -Dfile.encoding=UTF-8 --add-exports java.desktop/com.apple.eawt.event=ALL-UNNAMED --add-exports java.desktop/com.apple.eio=ALL-UNNAMED --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.text=ALL-UNNAMED --add-opens java.desktop/java.awt=ALL-UNNAMED --add-opens java.desktop/java.awt.font=ALL-UNNAMED --add-opens java.desktop/java.awt.geom=ALL-UNNAMED" />
+    <option name="VM_PARAMETERS" value="-Xms1024m -Xmx4096m -Ddorg.diylc.debugAreaPerformance=true -Dorg.diylc.scriptRun=true -Ddorg.diylc.cloud.baseUrl=http://localhost:8080 -Dfile.encoding=UTF-8 --add-exports java.desktop/com.apple.eawt.event=ALL-UNNAMED --add-exports java.desktop/com.apple.eio=ALL-UNNAMED --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.text=ALL-UNNAMED --add-opens java.desktop/java.awt=ALL-UNNAMED --add-opens java.desktop/java.awt.font=ALL-UNNAMED --add-opens java.desktop/java.awt.geom=ALL-UNNAMED" />
    <extension name="coverage">
      <pattern>
        <option name="PATTERN" value="org.diylc.*" />
@@ -0,0 +1,17 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="RegressionTestRunner" type="Application" factoryName="Application" nameIsGenerated="true">
+    <option name="MAIN_CLASS_NAME" value="org.diylc.RegressionTestRunner" />
+    <module name="diylc-swing" />
+    <option name="PROGRAM_PARAMETERS" value="$PROJECT_DIR$/../diylc-regression-data TEST" />
+    <option name="VM_PARAMETERS" value="--add-exports java.desktop/com.apple.eawt.event=ALL-UNNAMED --add-exports java.desktop/com.apple.eio=ALL-UNNAMED --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.text=ALL-UNNAMED --add-opens java.desktop/java.awt=ALL-UNNAMED --add-opens java.desktop/java.awt.font=ALL-UNNAMED --add-opens java.desktop/java.awt.geom=ALL-UNNAMED" />
+    <extension name="coverage">
+      <pattern>
+        <option name="PATTERN" value="org.diylc.*" />
+        <option name="ENABLED" value="true" />
+      </pattern>
+    </extension>
+    <method v="2">
+      <option name="Make" enabled="true" />
+    </method>
+  </configuration>
+</component>
@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -0,0 +1,123 @@
+#!/bin/bash
+
+# Script to build all Maven profiles and copy zip files to deployment folder
+# Usage: ./build-all-profiles.sh [to-deploy-folder]
+
+set -e  # Exit on error
+
+# Parse arguments
+DEPLOY_DIR="${1:-}"
+
+# Configuration
+PROJECT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+SWING_MODULE_DIR="${PROJECT_DIR}/diylc-swing"
+DEPLOY_DIR="${DEPLOY_DIR:-${PROJECT_DIR}/deploy}"
+
+# List of profiles to build
+PROFILES=(
+    "universal-zip"
+    "linux-appimage"
+    "win64-zip"
+    "win64-installer"
+    "mac-x86"
+    "mac-arm"
+)
+
+echo "=========================================="
+echo "Building all Maven profiles"
+echo "=========================================="
+echo "Project directory: ${PROJECT_DIR}"
+echo "Swing module directory: ${SWING_MODULE_DIR}"
+echo "Deployment directory: ${DEPLOY_DIR}"
+echo "Tests: Skipped"
+echo ""
+
+# Create deployment directory if it doesn't exist
+mkdir -p "${DEPLOY_DIR}"
+
+# Change to project root directory
+cd "${PROJECT_DIR}"
+
+# Build each profile (clean before each one)
+TARGET_DIR="${SWING_MODULE_DIR}/target"
+TOTAL_ZIP_COUNT=0
+
+for profile in "${PROFILES[@]}"; do
+    echo "----------------------------------------"
+    echo "Building profile: ${profile}"
+    echo "----------------------------------------"
+    
+    # Clean and build from root, specifying the swing module and profile
+    # This ensures dependencies (diylc-core, diylc-library) are built first
+    mvn clean package -pl diylc-swing -am -P"${profile}" -DskipTests || {
+        echo "ERROR: Failed to build profile ${profile}"
+        echo "Continuing with next profile..."
+        continue
+    }
+    
+    echo "✓ Profile ${profile} built successfully"
+    
+    # Copy zip and exe files immediately after each build (before next clean)
+    if [ -d "${TARGET_DIR}" ]; then
+        echo "Looking for artifacts in ${TARGET_DIR}..."
+        PROFILE_FILE_COUNT=0
+        
+        # Find all zip files in target directory (excluding DIYLC-notarize.zip)
+        while IFS= read -r -d '' zipfile; do
+            filename=$(basename "${zipfile}")
+            # Skip DIYLC-notarize.zip files
+            if [[ "${filename}" != "DIYLC-notarize.zip" ]] && [ -f "${zipfile}" ]; then
+                dest="${DEPLOY_DIR}/${filename}"
+                
+                echo "  → Copying: ${filename}"
+                cp "${zipfile}" "${dest}"
+                TOTAL_ZIP_COUNT=$((TOTAL_ZIP_COUNT + 1))
+                PROFILE_FILE_COUNT=$((PROFILE_FILE_COUNT + 1))
+            fi
+        done < <(find "${TARGET_DIR}" -maxdepth 1 -type f -name "*.zip" -print0 2>/dev/null)
+        
+        # Find all exe files in target directory
+        while IFS= read -r -d '' exefile; do
+            if [ -f "${exefile}" ]; then
+                filename=$(basename "${exefile}")
+                dest="${DEPLOY_DIR}/${filename}"
+                
+                echo "  → Copying: ${filename}"
+                cp "${exefile}" "${dest}"
+                TOTAL_ZIP_COUNT=$((TOTAL_ZIP_COUNT + 1))
+                PROFILE_FILE_COUNT=$((PROFILE_FILE_COUNT + 1))
+            fi
+        done < <(find "${TARGET_DIR}" -maxdepth 1 -type f -name "*.exe" -print0 2>/dev/null)
+        
+        if [ ${PROFILE_FILE_COUNT} -eq 0 ]; then
+            echo "  ⚠ Warning: No artifacts found for profile ${profile}"
+            # List what's actually in the target directory for debugging
+            echo "  Debug: Files in target directory:"
+            ls -la "${TARGET_DIR}"/*.{zip,exe} 2>/dev/null | head -5 || echo "    (no zip/exe files found)"
+        else
+            echo "  ✓ Copied ${PROFILE_FILE_COUNT} file(s) from ${profile}"
+        fi
+    else
+        echo "  ⚠ Warning: Target directory ${TARGET_DIR} does not exist"
+    fi
+    
+    echo ""
+done
+
+echo "=========================================="
+echo "Copying summary"
+echo "=========================================="
+if [ ${TOTAL_ZIP_COUNT} -eq 0 ]; then
+    echo "No artifacts were copied"
+else
+    echo "✓ Copied ${TOTAL_ZIP_COUNT} file(s) total to ${DEPLOY_DIR}"
+fi
+
+echo ""
+echo "=========================================="
+echo "Build and deployment complete!"
+echo "=========================================="
+echo "Deployment folder: ${DEPLOY_DIR}"
+echo "Files:"
+ls -lh "${DEPLOY_DIR}"/*.{zip,exe} 2>/dev/null || echo "  (no zip/exe files found)"
+
@@ -7,15 +7,15 @@
    <parent>
        <groupId>org.diylc</groupId>
        <artifactId>diylc-parent</artifactId>
-        <version>5.2.0</version>
+        <version>6.4.0</version>
    </parent>
    
    <artifactId>diylc-core</artifactId>
    <!-- No need to specify version - it inherits from parent -->
    
    <properties>
-        <maven.compiler.source>17</maven.compiler.source>
-        <maven.compiler.target>17</maven.compiler.target>
+        <maven.compiler.source>21</maven.compiler.source>
+        <maven.compiler.target>21</maven.compiler.target>
    </properties>
    
    <dependencies>
@@ -60,7 +60,7 @@
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
-            <version>2.16.1</version>
+            <version>2.22.1</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -0,0 +1,95 @@
+/*
+
+    DIY Layout Creator (DIYLC).
+    Copyright (c) 2009-2025 held jointly by the individual authors.
+
+    This file is part of DIYLC.
+
+    DIYLC is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    DIYLC is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with DIYLC.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+package org.diylc.announcements;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+/**
+ * Utility methods for detecting and extracting URLs from announcements and HTML.
+ */
+public class AnnouncementUtils {
+
+  private static final Pattern HREF_PATTERN = Pattern.compile(
+      "href=[\"']([^\"']+)[\"']", Pattern.CASE_INSENSITIVE);
+
+  /**
+   * Extracts the first URL found in the text or HTML.
+   *
+   * @param html text or HTML content
+   * @return first URL found, or null if none
+   */
+  public static String extractFirstUrl(String html) {
+    List<String> urls = extractUrls(html);
+    return urls.isEmpty() ? null : urls.get(0);
+  }
+
+  /**
+   * Extracts all unique URLs found in the HTML href attributes in order of appearance.
+   *
+   * @param html text or HTML content
+   * @return list of unique URLs
+   */
+  public static List<String> extractUrls(String html) {
+    List<String> urls = new ArrayList<String>();
+    if (html == null || html.isEmpty()) {
+      return urls;
+    }
+
+    Matcher hrefMatcher = HREF_PATTERN.matcher(html);
+    while (hrefMatcher.find()) {
+      String url = hrefMatcher.group(1).trim();
+      url = normalizeUrl(url);
+      if (!urls.contains(url)) {
+        urls.add(url);
+      }
+    }
+
+    return urls;
+  }
+
+  /**
+   * Checks whether the HTML contains any link.
+   *
+   * @param html text or HTML content
+   * @return true if at least one URL is detected, false otherwise
+   */
+  public static boolean containsLink(String html) {
+    return extractFirstUrl(html) != null;
+  }
+
+  /**
+   * Normalizes a URL to ensure it has a valid protocol if starting with www.
+   */
+  public static String normalizeUrl(String url) {
+    if (url == null) {
+      return null;
+    }
+    String trimmed = url.trim();
+    if (trimmed.startsWith("www.")) {
+      return "http://" + trimmed;
+    }
+    return trimmed;
+  }
+}
@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -29,6 +29,7 @@ import java.io.Serializable;
 import java.util.List;
 import java.util.Set;

+import org.diylc.core.ComponentGroup;
 import org.diylc.core.IDIYComponent;

 /**
@@ -44,19 +45,21 @@ public class ComponentTransferable implements Transferable, Serializable {
  public static final DataFlavor listFlavor = new DataFlavor(ComponentTransferable.class, "application/diylc");
  
  private List<IDIYComponent<?>> components;
-  private Set<Set<IDIYComponent<?>>> groups;
+  private Set<ComponentGroup> groups;
+  private String name;

  public ComponentTransferable() {
    super();
  }
  
-  public ComponentTransferable(List<IDIYComponent<?>> components) {
+  public ComponentTransferable(List<IDIYComponent<?>> components, String name) {
    super();
    this.components = components;
+    this.name = name;
    this.groups = null;
  }

-  public ComponentTransferable(List<IDIYComponent<?>> components, Set<Set<IDIYComponent<?>>> groups) {
+  public ComponentTransferable(List<IDIYComponent<?>> components, Set<ComponentGroup> groups) {
    super();
    this.components = components;
    this.groups = groups;
@@ -84,7 +87,11 @@ public class ComponentTransferable implements Transferable, Serializable {
    return components;
  }
  
-  public Set<Set<IDIYComponent<?>>> getGroups() {
+  public Set<ComponentGroup> getGroups() {
    return groups;
  }
+
+  public String getName() {
+    return name;
+  }
 }
@@ -1,6 +1,6 @@
 /*
 * 
- * DIY Layout Creator (DIYLC). Copyright (c) 2009-2018 held jointly by the individual authors.
+ * DIY Layout Creator (DIYLC). Copyright (c) 2009-2025 held jointly by the individual authors.
 * 
 * This file is part of DIYLC.
 * 
@@ -17,15 +17,11 @@
 */
 package org.diylc.clipboard;

-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Objects;
-import java.util.Set;
+import java.util.*;
 import java.util.stream.Collectors;
 import org.apache.log4j.Logger;

+import org.diylc.core.ComponentGroup;
 import org.diylc.core.IDIYComponent;

 public class ComponentTransferableFactory {
@@ -40,13 +36,19 @@ public class ComponentTransferableFactory {
    return instance;
  }
  
-  public ComponentTransferable build(Collection<IDIYComponent<?>> selectedComponents, Set<Set<IDIYComponent<?>>> groups) {
-    Set<IDIYComponent<?>> originalComponentSet = new HashSet<IDIYComponent<?>>(selectedComponents);
+  public ComponentTransferable build(Collection<IDIYComponent<?>> selectedComponents, Set<ComponentGroup> groups) {
+
    List<IDIYComponent<?>> originalComponents = new ArrayList<IDIYComponent<?>>(selectedComponents);
+
+    Map<UUID, UUID> idMap = new HashMap<>();
+
    List<IDIYComponent<?>> clonedComponents = originalComponents.stream(
        ).map(x -> {
          try {
-            return x.clone();
+            IDIYComponent<?> clone = x.clone();
+            clone.setId(UUID.randomUUID());
+            idMap.put(x.getId(), clone.getId());
+            return clone;
          } catch (CloneNotSupportedException e) {
            LOG.error(e);
            return null;
@@ -54,22 +56,18 @@ public class ComponentTransferableFactory {
        })
        .filter(Objects::nonNull)
        .collect(Collectors.toList());
-    Set<Set<IDIYComponent<?>>> clonedGroups = new HashSet<Set<IDIYComponent<?>>>();
-    
-    for (Set<IDIYComponent<?>> group : groups) {
-      if (group.isEmpty())
-        continue;
-      
-      if (originalComponentSet.contains(group.iterator().next())) {
-        Set<IDIYComponent<?>> clonedGroup = new HashSet<IDIYComponent<?>>();
-        clonedGroups.add(clonedGroup);
-        for (int i = 0; i < originalComponents.size(); i++) {
-          if (group.contains(originalComponents.get(i))) {
-            clonedGroup.add(clonedComponents.get(i));
-          }
-        }
-      }
-    }
+
+    Set<ComponentGroup> clonedGroups = groups.stream()
+        .map(group -> {
+          Set<UUID> newIds = group.getComponentIds().stream()
+              .map(idMap::get)
+              .filter(Objects::nonNull)
+              .collect(Collectors.toSet());
+          // Only create group if it has at least one valid ID
+          return newIds.isEmpty() ? null : new ComponentGroup(newIds, group.getName());
+        })
+        .filter(Objects::nonNull)
+        .collect(Collectors.toSet());
    
    return new ComponentTransferable(clonedComponents, clonedGroups);
  }
@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -0,0 +1,43 @@
+/*
+
+    DIY Layout Creator (DIYLC).
+    Copyright (c) 2009-2025 held jointly by the individual authors.
+
+    This file is part of DIYLC.
+
+    DIYLC is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    DIYLC is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with DIYLC.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+package org.diylc.common;
+
+/**
+ * The two ways a saved {@link BuildingBlock} can be placed on the canvas.
+ *
+ * @author Branislav Stojkovic
+ */
+public enum BlockInstantiationMode {
+
+  /**
+   * The block's components are cloned as individual, independently selectable components and
+   * grouped together (the original, and only, behavior before composite mode was introduced).
+   */
+  GROUP,
+
+  /**
+   * The block's components are cloned and wrapped in a single
+   * {@code org.diylc.components.composite.CompositeComponent} that behaves as one rigid
+   * component with its own name, aggregating the control points of all its children.
+   */
+  COMPOSITE
+}
@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,6 +1,6 @@
 /*
 * 
- * DIY Layout Creator (DIYLC). Copyright (c) 2009-2018 held jointly by the individual authors.
+ * DIY Layout Creator (DIYLC). Copyright (c) 2009-2025 held jointly by the individual authors.
 * 
 * This file is part of DIYLC.
 * 
@@ -56,14 +56,14 @@ public class ComponentType implements Serializable {
  private boolean enableCache;
  private List<String[]> datasheet;
  private int datasheetCreationStepCount;
-  
-  public ComponentType() {  
+
+  public ComponentType() {
  }

  public ComponentType(String name, String description, CreationMethod creationMethod, String category,
      String namePrefix, String author, Icon icon, Class<? extends IDIYComponent<?>> instanceClass, double zOrder,
-      boolean flexibleZOrder, BomPolicy bomPolicy, boolean autoEdit, IComponentTransformer transformer, 
-      KeywordPolicy keywordPolicy, String keywordTag, boolean enableCache, List<String[]> datasheet, 
+      boolean flexibleZOrder, BomPolicy bomPolicy, boolean autoEdit, IComponentTransformer transformer,
+      KeywordPolicy keywordPolicy, String keywordTag, boolean enableCache, List<String[]> datasheet,
      int datasheetCreationStepCount) {
    super();
    this.name = name;
@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -68,5 +68,9 @@ public enum DrawOption {
  /**
   * Whether locked components should be rendered as transparent or not.
   */
-  LOCKED_ALPHA;
+  LOCKED_ALPHA,
+  /**
+   * When applied, all colors will be converted to blackest black or whitest white
+   */
+  MONOCHROMATIC;
 }
@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -19,13 +19,12 @@
    along with DIYLC.  If not, see <http://www.gnu.org/licenses/>.

 */
-package org.diylc.swing.gui;
+package org.diylc.common;

 import java.io.File;
 import java.util.List;
 import java.util.Set;

-import org.diylc.common.PropertyWrapper;
 import org.diylc.core.IView;

 public class DummyView implements IView {
@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -21,7 +21,6 @@
 */
 package org.diylc.common;

-import java.awt.Rectangle;
 import java.awt.geom.Point2D;

 import org.diylc.core.Project;
@@ -45,18 +44,17 @@ public enum EventType {
   * has been either reloaded or loaded with undo/redo operations.
   */
  PROJECT_LOADED,
+  /**
+   * Called when the current project is saved to a file. The first parameter is the current file name.
+   */
+  PROJECT_SAVED,
  /**
   * Called when either current file name or modified flag are changed. The first parameter is the
   * current file name, the second one is a boolean modified flag.
   */
  FILE_STATUS_CHANGED,
  /**
-   * Called when selection rectangle is changed. Object of type {@link Rectangle} is the only
-   * parameter and it contains the new selection rectangle.
-   */
-  SELECTION_RECT_CHANGED,
-  /**
-   * Called when component selection is changed. New {@link ComponentSelection} is attached as a
+   * Called when component selection is changed. New list of components and control point map is attached as a
   * parameter.
   */
  SELECTION_CHANGED,
@@ -114,5 +112,10 @@ public enum EventType {
  /**
   * Signals that the Cloud account is logged out.
   */
-  CLOUD_LOGGED_OUT;
+  CLOUD_LOGGED_OUT,
+  /**
+   * Called when the mouse hovers over sticky control points (nodes) in tooltip mode.
+   * Parameters: String text (semicolon-separated component and node names, or null), Point point.
+   */
+  NODE_NAME_HOVER_TOOLTIP;
 }
@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -25,13 +25,28 @@ import java.io.IOException;

 public interface IBlockProcessor {

-  public static final String BLOCKS_KEY = "buildingBlocks";  
+  public static final String BLOCKS_KEY = "buildingBlocks";
  public static final String DEFAULT_BLOCKS_IMPORTED_KEY = "defaultBlocksImported";

+  /**
+   * Prefix that marks a string as a reference to a building block rather than a component class
+   * name. Used wherever components and blocks share a single identifier list, such as keyboard
+   * shortcuts ({@code COMPONENT_SHORTCUT_KEY}) and the recently used list
+   * ({@link org.diylc.common.IPlugInPort#RECENT_COMPONENTS_KEY}). A block identifier looks like
+   * {@code "block:My Block Name"}.
+   */
+  public static final String BLOCK_PREFIX = "block:";
+
  void saveSelectionAsBlock(String blockName);

-  void loadBlock(String blockName) throws InvalidBlockException;
-  
+  /**
+   * Loads the block in the given {@link BlockInstantiationMode}. {@link BlockInstantiationMode#COMPOSITE}
+   * (a single rigid component) is the default mode used by most call sites (see design decision D10 in
+   * {@code docs/plans/composite-building-blocks.md}); {@link BlockInstantiationMode#GROUP} instantiates
+   * the block as a group of loose components.
+   */
+  void loadBlock(String blockName, BlockInstantiationMode mode) throws InvalidBlockException;
+
  void deleteBlock(String blockName);
  
  int importBlocks(String fileName) throws IOException;
@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -0,0 +1,52 @@
+/*
+    DIY Layout Creator (DIYLC).
+    Copyright (c) 2009-2025 held jointly by the individual authors.
+
+    This file is part of DIYLC.
+
+    DIYLC is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    DIYLC is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with DIYLC.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+package org.diylc.common;
+
+import java.util.Set;
+
+import org.diylc.core.ComponentGroup;
+
+/**
+ * Interface for component grouping operations.
+ * 
+ * @author Branislav Stojkovic
+ */
+public interface IGroupProcessor {
+
+  /**
+   * Returns the set of component groups in the current project. Each group is a set of components
+   * that are grouped together.
+   *
+   * @return set of component groups
+   */
+  Set<ComponentGroup> getComponentGroups();
+
+  /**
+   * Groups all selected components.
+   */
+  void groupSelectedComponents();
+
+  /**
+   * Ungroups all selected components.
+   */
+  void ungroupSelectedComponents();
+}
+
@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -41,16 +41,18 @@ import org.diylc.core.IDIYComponent;
 import org.diylc.core.Project;
 import org.diylc.core.Template;
 import org.diylc.core.Theme;
+import org.diylc.core.measures.ResizeDimensions;
 import org.diylc.core.measures.Size;
+import org.diylc.filter.IComponentFilter;
 import org.diylc.test.ITestProcessor;

 /**
 * Interface for communication between plug-ins and the application. Plug-ins may acquire
 * information or make changes through this interface. Application events are dispatched to plug-ins
 * through {@link MessageDispatcher}
- * 
+ *
 * @author Branislav Stojkovic
- * 
+ *
 * @see IPlugIn
 * @see MessageDispatcher
 * @see IMessageListener
@@ -84,18 +86,24 @@ public interface IPlugInPort extends ISelectionProcessor, IMouseProcessor, IKeyP
  public static final String RENUMBER_ON_PASTE_KEY = "renumberOnPaste";
  public static final String RULER_IN_SUBDIVISION_KEY = "rulerInSubdivision";
  public static final String CACHING_ENABLED_KEY = "cachingEnabled";
-  
+  public static final String FONT_SCALE_FACTOR_KEY = "fontScaleFactor";
+  public static final String SHOW_RESIZE_DIMENSIONS_TOOLTIP_KEY = "showResizeDimensionsTooltip";
+  public static final String AUTO_UNIT_CONVERSION_KEY = "autoUnitConversion";
+
+
  public static final String RULER_IN_SUBDIVISION_2 = "base of 2";
  public static final String RULER_IN_SUBDIVISION_10 = "base of 10";
  public static final String RULER_IN_SUBDIVISION_DEFAULT = RULER_IN_SUBDIVISION_10;
-  
+
  public static final String SNAP_TO_NONE = "None";
  public static final String SNAP_TO_GRID = "Grid";
  public static final String SNAP_TO_COMPONENTS = "Components";
  public static final String SNAP_TO_DEFAULT = SNAP_TO_GRID;
-  
+
+  public static final String SHOW_NODE_NAME_TOOLTIPS_KEY = "showNodeNameTooltips";
+
  public static final String LOCKED_ALPHA = "lockedAlpha";
-  
+
  public static final String LANGUAGE = "language";
  public static final String LANGUAGE_DEFAULT = "English";

@@ -108,25 +116,25 @@ public interface IPlugInPort extends ISelectionProcessor, IMouseProcessor, IKeyP
  public static final int NOBUTTON = 0;
  public static final int BUTTON1 = 1;
  public static final int BUTTON2 = 2;
-  public static final int BUTTON3 = 3;  
+  public static final int BUTTON3 = 3;

  /**
   * Returns size of the canvas that takes project dimensions into account as well as zoom level.
   * Each dimension is calculated as the product of the actual size and the number of pixels per
   * unit. If <code>useZoom</code> is set to true, the result is scaled by zoom factor.
-   * 
+   *
   * @param useZoom
   * @param includeExtraSpace
-   * 
+   *
   * @return canvas dimensions
   */
  Dimension getCanvasDimensions(boolean useZoom, boolean includeExtraSpace);

  /**
   * Returns an instance of {@link Cursor} that should be used at the specified location.
-   * 
+   *
   * Note: point coordinates are scaled for zoom factor.
-   * 
+   *
   * @param point
   * @param ctrlDown
   * @param shiftDown
@@ -137,14 +145,14 @@ public interface IPlugInPort extends ISelectionProcessor, IMouseProcessor, IKeyP

  /**
   * Returns an instance of currently loaded project.
-   * 
+   *
   * @return
   */
  Project getCurrentProject();

  /**
   * Loads specified {@link Project}.
-   * 
+   *
   * @param project
   * @param freshStart
   * @param filename file name when loading from a file
@@ -158,22 +166,22 @@ public interface IPlugInPort extends ISelectionProcessor, IMouseProcessor, IKeyP

  /**
   * Loads a project from the specified file.
-   * 
+   *
   * @param fileName
   */
  void loadProjectFromFile(String fileName);

  /**
   * Saves the current project into the specified file.
-   * 
+   *
   * @param fileName
   * @param isBackup
   */
  void saveProjectToFile(String fileName, boolean isBackup);
-  
+
  /**
   * Exports the current project into one or more files - one per layer and potentially drill layer.
-   * 
+   *
   * @param fileNameBase
   * @param g2d
   */
@@ -191,7 +199,7 @@ public interface IPlugInPort extends ISelectionProcessor, IMouseProcessor, IKeyP

  /**
   * Shows a user dialog if there are changes to confirm that it's safe to proceed.
-   * 
+   *
   * @return true, if file actions (new, open, close) can be taken
   */
  boolean allowFileAction();
@@ -200,7 +208,7 @@ public interface IPlugInPort extends ISelectionProcessor, IMouseProcessor, IKeyP
   * Returns all available {@link ComponentType}s classified by category. Result is a {@link Map}
   * between category name to a {@link List} of all {@link ComponentType}s that share that category
   * name.
-   * 
+   *
   * @return
   */
  Map<String, List<ComponentType>> getComponentTypes();
@@ -208,7 +216,7 @@ public interface IPlugInPort extends ISelectionProcessor, IMouseProcessor, IKeyP
  /**
   * Draws project on the provided {@link Graphics2D}. If the provided filter is not null, it will
   * be used to filter the components that are shown.
-   * 
+   *
   * @param g2d
   * @param drawOptions specific drawing options
   * @param filter
@@ -222,35 +230,35 @@ public interface IPlugInPort extends ISelectionProcessor, IMouseProcessor, IKeyP

  /**
   * Returns current zoom level where <code>zoomLevel = 1.0d</code> means 100%.
-   * 
+   *
   * @return current zoom level
   */
  double getZoomLevel();

  /**
   * Changes current zoom level where <code>zoomLevel = 1.0d</code> means 100%
-   * 
+   *
   * @param zoomLevel new zoom leve
   */
  void setZoomLevel(double zoomLevel);

  /**
   * Returns current version number.
-   * 
+   *
   * @return
   */
  VersionNumber getCurrentVersionNumber();
-  
+
  /**
-   * Returns few most recent versions. 
-   * 
+   * Returns few most recent versions.
+   *
   * @return
   */
  List<Version> getRecentUpdates();

  /**
   * Adds a list of components to the project.
-   * 
+   *
   * @param componentTransferable
   * @param autoGroup
   * @param assignNewNames
@@ -269,7 +277,7 @@ public interface IPlugInPort extends ISelectionProcessor, IMouseProcessor, IKeyP

  /**
   * Sets default value for the specified property name for currently selected component types.
-   * 
+   *
   * @param propertyName display name for property
   * @param value new default value, must not be null
   */
@@ -277,7 +285,7 @@ public interface IPlugInPort extends ISelectionProcessor, IMouseProcessor, IKeyP

  /**
   * Sets default value for the specified property name for projects.
-   * 
+   *
   * @param clazz class to set defaults to
   * @param propertyName display name for property
   * @param value new default value, must not be null
@@ -291,6 +299,15 @@ public interface IPlugInPort extends ISelectionProcessor, IMouseProcessor, IKeyP
   */
  List<PropertyWrapper> getMutualSelectionProperties();

+  /**
+   * Available only during resizing, returns the dimensions of the component being resized.
+   * Otherwise returns null.
+   *
+   * @return ResizeDimensions with width, height (in mm or in depending on configuration), 
+   *         and length (if component implements IHaveLength), or null if not resizing
+   */
+  ResizeDimensions getResizeDimensions();
+
  void editSelection();

  /**
@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -31,7 +31,7 @@ import org.diylc.core.ExpansionMode;
 import org.diylc.core.IDIYComponent;
 import org.diylc.core.measures.Size;

-public interface ISelectionProcessor {
+public interface ISelectionProcessor extends IGroupProcessor {

  /**
   * Returns the current {@link ComponentTransferable}.
@@ -89,16 +89,6 @@ public interface ISelectionProcessor {
   */
  void rotateSelection(int direction);

-  /**
-   * Groups all selected components.
-   */
-  void groupSelectedComponents();
-
-  /**
-   * Ungroups all selected components.
-   */
-  void ungroupSelectedComponents();
-
  /**
   * Mirrors selected components in the given axis.
   * 
@@ -3,6 +3,8 @@ package org.diylc.common;
 import org.diylc.appframework.simplemq.MessageDispatcher;
 import org.diylc.plugins.chatbot.service.ChatbotService;
 import org.diylc.plugins.cloud.service.CloudService;
+import org.diylc.plugins.compare.service.CompareService;
+import org.diylc.presenter.DrawingManager;

 public interface IServiceManager {

@@ -10,5 +12,9 @@ public interface IServiceManager {

  ChatbotService getChatbotService();

+  CompareService getCompareService();
+
  MessageDispatcher<EventType> getMessageDispatcher();
+
+  DrawingManager getDrawingManager();
 }
@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,6 +1,6 @@
 /*
 * 
- * DIY Layout Creator (DIYLC). Copyright (c) 2009-2018 held jointly by the individual authors.
+ * DIY Layout Creator (DIYLC). Copyright (c) 2009-2025 held jointly by the individual authors.
 * 
 * This file is part of DIYLC.
 * 
@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -0,0 +1,89 @@
+/*
+
+    DIY Layout Creator (DIYLC).
+    Copyright (c) 2009-2025 held jointly by the individual authors.
+
+    This file is part of DIYLC.
+
+    DIYLC is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    DIYLC is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with DIYLC.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+package org.diylc.common;
+
+import java.io.Serializable;
+import java.math.BigDecimal;
+
+public class Percentage implements Serializable, Cloneable {
+
+  private static final long serialVersionUID = 1L;
+
+  private BigDecimal value;
+
+  public Percentage(BigDecimal value) {
+    this.value = value;
+  }
+
+  public Percentage(double value) {
+    this.value = BigDecimal.valueOf(value);
+  }
+  
+  public Percentage(int value) {
+    this.value = BigDecimal.valueOf((long) value);
+  }
+
+  public BigDecimal getValue() {
+    return value;
+  }
+
+  public void setValue(BigDecimal value) {
+    this.value = value;
+  }
+
+  @Override
+  public int hashCode() {
+    final int prime = 31;
+    int result = 1;
+    result = prime * result + ((value == null) ? 0 : value.stripTrailingZeros().hashCode());
+    return result;
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    if (this == obj)
+      return true;
+    if (obj == null)
+      return false;
+    if (getClass() != obj.getClass())
+      return false;
+    Percentage other = (Percentage) obj;
+    if (value == null) {
+      if (other.value != null)
+        return false;
+    } else if (value.compareTo(other.value) != 0)
+      return false;
+    return true;
+  }
+
+  @Override
+  public String toString() {
+    if (value == null) return "null%";
+    BigDecimal stripped = value.stripTrailingZeros();
+    return String.format("%s%%", stripped.toPlainString());
+  }
+
+  @Override
+  public Object clone() throws CloneNotSupportedException {
+    return super.clone();
+  }
+}
@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -24,8 +24,11 @@ package org.diylc.common;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;

+import org.diylc.appframework.miscutils.ConfigurationManager;
 import org.diylc.core.IDynamicPropertySource;
 import org.diylc.core.IPropertyValidator;
+import org.diylc.core.measures.Size;
+import org.diylc.core.measures.SizeUnit;

 /**
 * Entity class for editable properties extracted from component objects. Represents a single
@@ -65,7 +68,8 @@ public class PropertyWrapper implements Cloneable {
  public void readFrom(Object object) throws IllegalArgumentException, IllegalAccessException,
      InvocationTargetException, SecurityException, NoSuchMethodException {
    this.ownerObject = object;
-    this.value = getGetter().invoke(object);
+    Object value = getGetter().invoke(object);
+    this.value = value;
  }

  // public void readUniqueFrom(IDIYComponent component)
@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -30,6 +30,7 @@ import java.lang.reflect.Array;
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
 import java.util.Arrays;
+import java.util.UUID;
 import java.util.stream.Collectors;

 import org.diylc.core.IDIYComponent;
@@ -52,6 +53,7 @@ public abstract class AbstractComponent<T> implements IDIYComponent<T> {

  private static final long serialVersionUID = 1L;

+  protected UUID id = UUID.randomUUID();
  protected String name = "";

  public static Color SELECTION_COLOR = Color.red;
@@ -62,6 +64,7 @@ public abstract class AbstractComponent<T> implements IDIYComponent<T> {
  public static Color LIGHT_METAL_COLOR = Color.decode("#EEEEEE");
  public static Color COPPER_COLOR = Color.decode("#DA8A67");
  public static Color GOLD_COLOR = Color.decode("#F4B301");
+  public static Color BRASS_COLOR = Color.decode("#B8860B");
  public static Color FR4_COLOR = Color.decode("#6B9B6B");
  public static Color FR4_LIGHT_COLOR = Color.decode("#BABE71");
  public static Color PHENOLIC_COLOR = Color.decode("#F8EBB3");
@@ -78,6 +81,19 @@ public abstract class AbstractComponent<T> implements IDIYComponent<T> {
    this.name = name;
  }

+  @Override
+  public UUID getId() {
+    if (id == null) {
+      id = UUID.randomUUID();
+    }
+    return id;
+  }
+
+  @Override
+  public void setId(UUID id) {
+    this.id = id;
+  }
+
  @Override
  public boolean canControlPointOverlap(int index) {
    return false;
@@ -186,10 +202,14 @@ public abstract class AbstractComponent<T> implements IDIYComponent<T> {
            field.setAccessible(true);
            Object value = field.get(this);

+            if (field.getName().equalsIgnoreCase("id")) {
+              value = getId();
+            }
+
            // Deep copy point arrays.
            // TODO: something nicer
            if (value != null && value.getClass().isArray()
-                && value.getClass().getComponentType().isAssignableFrom(Point2D.class)) {
+                && Point2D.class.isAssignableFrom(value.getClass().getComponentType())) {
              Object newArray = Array.newInstance(value.getClass().getComponentType(), Array.getLength(value));
              for (int i = 0; i < Array.getLength(value); i++) {
                Point2D p = (Point2D) Array.get(value, i);
@@ -274,11 +294,6 @@ public abstract class AbstractComponent<T> implements IDIYComponent<T> {
    return null;
  }
  
-  @Override
-  public String[] getSectionNames(int pointIndex) {   
-    return null;
-  }
-  
  @Override
  public boolean canPointMoveFreely(int pointIndex) {   
    return true;
@@ -1,6 +1,6 @@
 /*
 * 
- * DIY Layout Creator (DIYLC). Copyright (c) 2009-2018 held jointly by the individual authors.
+ * DIY Layout Creator (DIYLC). Copyright (c) 2009-2025 held jointly by the individual authors.
 * 
 * This file is part of DIYLC.
 * 
@@ -37,16 +37,14 @@ import com.thoughtworks.xstream.annotations.XStreamOmitField;
 import org.diylc.common.IPlugInPort;
 import org.diylc.common.LineStyle;
 import org.diylc.common.ObjectCache;
-import org.diylc.core.ComponentState;
-import org.diylc.core.IDrawingObserver;
-import org.diylc.core.Project;
-import org.diylc.core.VisibilityPolicy;
+import org.diylc.core.*;
 import org.diylc.core.annotations.EditableProperty;
 import org.diylc.core.measures.Size;
 import org.diylc.core.measures.SizeUnit;
 import org.diylc.utils.Constants;

-public abstract class AbstractCurvedComponent<T> extends AbstractTransparentComponent<T> {
+public abstract class AbstractCurvedComponent<T> extends AbstractTransparentComponent<T> implements
+    IHaveLength {

  private static final long serialVersionUID = 1L;
  
@@ -151,10 +149,7 @@ public abstract class AbstractCurvedComponent<T> extends AbstractTransparentComp
      path.curveTo(p[4].getX(), p[4].getY(), p[5].getX(), p[5].getY(), p[6].getX(), p[6].getY());
    }

-    Composite oldComposite = g2d.getComposite();
-    if (alpha < MAX_ALPHA) {
-      g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 1f * alpha / MAX_ALPHA));
-    }
+    Composite oldComposite = applyAlpha(g2d);

    drawCurve(path, g2d, componentState, drawingObserver);

@@ -337,8 +332,12 @@ public abstract class AbstractCurvedComponent<T> extends AbstractTransparentComp
    // }
  }
  
-  @EditableProperty
+  @EditableProperty(name = "Length")
  public Size getLength() {
+    return calculateLength();
+  }
+
+  public Size calculateLength() {
    double d = 0;
      try {
      Point2D[] p = getControlPoints();
@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -22,24 +22,57 @@
 package org.diylc.components;

 import org.diylc.core.annotations.EditableProperty;
+import org.diylc.core.ComponentState;
+import org.diylc.common.Percentage;
+
+import java.awt.*;

 public abstract class AbstractTransparentComponent<T> extends AbstractComponent<T> {

  private static final long serialVersionUID = 1L;
+  private static final boolean OUTLINE_MODE_WHILE_DRAGGING = false;

-  public static byte MAX_ALPHA = 127;
+  public static byte MAX_ALPHA_LEGACY = Byte.MAX_VALUE;
+  public static int MAX_ALPHA = 100;

-  protected Byte alpha = MAX_ALPHA;
+  @Deprecated
+  protected Byte alpha;

-  @EditableProperty
-  public Byte getAlpha() {
-    if (alpha == null) {
-      alpha = MAX_ALPHA;
+  protected Percentage alphaPercent = new Percentage(100);
+
+  @EditableProperty(name = "Alpha")
+  public Percentage getAlpha() {
+    if (alphaPercent == null) {
+      if (alpha != null) {
+        alphaPercent = new Percentage(Math.round(100f * alpha / MAX_ALPHA_LEGACY));
+        alpha = null;
+      } else {
+        alphaPercent = new Percentage(100);
+      }
    }
-    return alpha;
+    return alphaPercent;
  }

-  public void setAlpha(Byte alpha) {
-    this.alpha = alpha;
+  public void setAlpha(Percentage alphaPercent) {
+    this.alphaPercent = alphaPercent;
+  }
+
+  public Composite applyAlpha(Graphics2D g2d, ComponentState componentState) {
+    Composite oldComposite = g2d.getComposite();
+    double alpha = (OUTLINE_MODE_WHILE_DRAGGING && componentState == ComponentState.DRAGGING) ? 0 :
+        getAlpha().getValue().doubleValue();
+    if (alpha < MAX_ALPHA) {
+      g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, (float)(alpha / 100d)));
+    }
+    return oldComposite;
+  }
+
+  public Composite applyAlpha(Graphics2D g2d) {
+    Composite oldComposite = g2d.getComposite();
+    double alpha = getAlpha().getValue().doubleValue();
+    if (alpha < MAX_ALPHA) {
+      g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, (float)(alpha / 100d)));
+    }
+    return oldComposite;
  }
 }
@@ -0,0 +1,296 @@
+/*
+
+    DIY Layout Creator (DIYLC).
+    Copyright (c) 2009-2025 held jointly by the individual authors.
+
+    This file is part of DIYLC.
+
+    DIYLC is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    DIYLC is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with DIYLC.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+package org.diylc.components.composite;
+
+import java.awt.Color;
+import java.awt.Composite;
+import java.awt.Graphics2D;
+import java.awt.Stroke;
+import java.awt.geom.Point2D;
+import java.awt.geom.Rectangle2D;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+import org.diylc.components.AbstractComponent;
+import org.diylc.components.AbstractTransparentComponent;
+import org.diylc.core.ComponentState;
+import org.diylc.core.IDIYComponent;
+import org.diylc.core.IDrawingObserver;
+import org.diylc.core.Project;
+import org.diylc.core.VisibilityPolicy;
+import org.diylc.core.annotations.BomPolicy;
+import org.diylc.core.annotations.ComponentDescriptor;
+import org.diylc.core.annotations.EditableProperty;
+import org.diylc.utils.Constants;
+
+/**
+ * Instantiation of a {@code BuildingBlock} as a single, rigid component rather than a group of
+ * loose ones. Wraps an embedded list of child components and aggregates their control points,
+ * so it can be placed, moved, rotated and wired up like any other component while the netlist,
+ * BOM and AI project description still see its individual terminals (see
+ * {@link #getControlPointNodeName(int)}).
+ *
+ * @author Branislav Stojkovic
+ */
+@ComponentDescriptor(
+    name = "Building Block",
+    description = "A group of components instantiated as a single rigid component",
+    category = "Building Blocks",
+    author = "Branislav Stojkovic",
+    instanceNamePrefix = "BLK",
+    zOrder = IDIYComponent.COMPONENT,
+    flexibleZOrder = true,
+    bomPolicy = BomPolicy.SHOW_ALL_NAMES,
+    autoEdit = false,
+    enableCache = false,
+    transformer = CompositeComponentTransformer.class,
+    hiddenInPalette = true)
+public class CompositeComponent extends AbstractTransparentComponent<String> {
+
+  private static final long serialVersionUID = 1L;
+
+  private List<IDIYComponent<?>> childComponents = new ArrayList<IDIYComponent<?>>();
+
+  // Name of the building block this instance was created from. Drives its display identity in
+  // the BOM, netlist report and AI project description (see ComponentProcessor.getDisplayTypeName).
+  private String blockName;
+
+  // Free-form label the user can edit after placement, independent of blockName. Shown in the BOM.
+  private String value;
+
+  // Flat index mapping a composite control point index to (child ordinal, child point index).
+  // Rebuilt lazily since children never change after construction and the arrays are not
+  // serialized (transient).
+  private transient int[] childOf;
+  private transient int[] pointOf;
+
+  /**
+   * Required no-arg constructor, used reflectively by {@code ComponentProcessor} and XStream.
+   */
+  public CompositeComponent() {
+    super();
+  }
+
+  private void buildIndexIfNeeded() {
+    if (childOf != null) {
+      return;
+    }
+    int total = 0;
+    for (IDIYComponent<?> c : childComponents) {
+      total += c.getControlPointCount();
+    }
+    int[] newChildOf = new int[total];
+    int[] newPointOf = new int[total];
+    int idx = 0;
+    for (int ci = 0; ci < childComponents.size(); ci++) {
+      IDIYComponent<?> c = childComponents.get(ci);
+      int count = c.getControlPointCount();
+      for (int pi = 0; pi < count; pi++) {
+        newChildOf[idx] = ci;
+        newPointOf[idx] = pi;
+        idx++;
+      }
+    }
+    childOf = newChildOf;
+    pointOf = newPointOf;
+  }
+
+  /**
+   * @return the embedded child components, in save order. Never {@code null}.
+   */
+  public List<IDIYComponent<?>> getChildComponents() {
+    if (childComponents == null) {
+      childComponents = new ArrayList<IDIYComponent<?>>();
+    }
+    return childComponents;
+  }
+
+  @EditableProperty(name = "Block", defaultable = false, sortOrder = 1)
+  public String getBlockName() {
+    return blockName;
+  }
+
+  /**
+   * Sets the source block name. Deliberately not named {@code setBlockName} so that
+   * {@code ComponentProcessor}'s getter/setter matching does not turn the "Block" property
+   * editable in the property editor - it is metadata about the instance, not a value the user
+   * should be able to change after placement.
+   */
+  public void initBlockName(String blockName) {
+    this.blockName = blockName;
+  }
+
+  @Override
+  public int getControlPointCount() {
+    buildIndexIfNeeded();
+    return childOf.length;
+  }
+
+  @Override
+  public Point2D getControlPoint(int index) {
+    buildIndexIfNeeded();
+    return childComponents.get(childOf[index]).getControlPoint(pointOf[index]);
+  }
+
+  @Override
+  public void setControlPoint(Point2D point, int index) {
+    buildIndexIfNeeded();
+    childComponents.get(childOf[index]).setControlPoint(point, pointOf[index]);
+  }
+
+  @Override
+  public boolean isControlPointSticky(int index) {
+    buildIndexIfNeeded();
+    return childComponents.get(childOf[index]).isControlPointSticky(pointOf[index]);
+  }
+
+  @Override
+  public boolean canControlPointOverlap(int index) {
+    buildIndexIfNeeded();
+    return childComponents.get(childOf[index]).canControlPointOverlap(pointOf[index]);
+  }
+
+  @Override
+  public VisibilityPolicy getControlPointVisibilityPolicy(int index) {
+    buildIndexIfNeeded();
+    return childComponents.get(childOf[index]).getControlPointVisibilityPolicy(pointOf[index]);
+  }
+
+  @Override
+  public String getControlPointNodeName(int index) {
+    buildIndexIfNeeded();
+    return childComponents.get(childOf[index]).getControlPointNodeName(pointOf[index]);
+  }
+
+  /**
+   * The composite is always rigid: it moves and rotates as a unit and never stretches. See design
+   * decision D4 in {@code docs/plans/composite-building-blocks.md}.
+   */
+  @Override
+  public boolean canPointMoveFreely(int pointIndex) {
+    return false;
+  }
+
+  @Override
+  public void createdIn(Project project) {
+    for (IDIYComponent<?> c : getChildComponents()) {
+      c.createdIn(project);
+    }
+  }
+
+  @Override
+  @EditableProperty
+  public String getValue() {
+    return value;
+  }
+
+  @Override
+  public void setValue(String value) {
+    this.value = value;
+  }
+
+  @Override
+  public void draw(Graphics2D g2d, ComponentState componentState, boolean outlineMode, Project project,
+      IDrawingObserver drawingObserver) {
+    Composite oldComposite = applyAlpha(g2d, componentState);
+    for (IDIYComponent<?> c : getChildComponents()) {
+      // Children always draw in their normal state - the composite draws its own selection
+      // outline below instead of letting every child paint its own highlight.
+      c.draw(g2d, componentState, outlineMode, project, drawingObserver);
+    }
+    g2d.setComposite(oldComposite);
+  }
+
+  @Override
+  public void drawIcon(Graphics2D g2d, int width, int height) {
+    // Must not touch `components` - ComponentProcessor draws this on a default-constructed,
+    // childless instance to build the palette icon.
+    g2d.setColor(LIGHT_METAL_COLOR);
+    g2d.fillRect(2, 2, width - 4, height - 4);
+    g2d.setColor(METAL_COLOR);
+    g2d.drawRect(2, 2, width - 4, height - 4);
+    int halfW = width / 2;
+    int halfH = height / 2;
+    g2d.drawLine(halfW, 2, halfW, height - 2);
+    g2d.drawLine(2, halfH, width - 2, halfH);
+  }
+
+  /**
+   * Deep-clones the composite together with all its children, so that two placed instances never
+   * share child objects (that would make moving one instance move the other - see the "clone()
+   * is the sharp edge" risk in {@code docs/plans/composite-building-blocks.md}). Preserves this
+   * component's own id and every child's id, matching {@link AbstractComponent#clone()}'s
+   * contract of copying identity by default - callers that need a genuinely new component
+   * reassign ids themselves, exactly as {@code BuildingBlockManager.loadBlock} does when it
+   * clones each source component individually to place a brand new instance of a block. This also
+   * keeps id-sensitive reflective comparisons (like the default {@code equalsTo} most child
+   * component classes inherit) working correctly between a composite and its own clone, which the
+   * undo dirty-check in {@code Presenter.notifyProjectModifiedIfNeeded} relies on.
+   */
+  @Override
+  public IDIYComponent<String> clone() throws CloneNotSupportedException {
+    CompositeComponent clone = new CompositeComponent();
+    clone.setId(getId());
+    clone.setName(getName());
+    clone.blockName = this.blockName;
+    clone.value = this.value;
+    // matches AbstractComponent.clone(), which shallow-copies the Percentage reference
+    clone.setAlpha(getAlpha());
+    List<IDIYComponent<?>> clonedComponents = new ArrayList<IDIYComponent<?>>(getChildComponents().size());
+    for (IDIYComponent<?> c : getChildComponents()) {
+      clonedComponents.add(c.clone());
+    }
+    clone.childComponents = clonedComponents;
+    return clone;
+  }
+
+  /**
+   * Overridden because {@link AbstractComponent#equalsTo(IDIYComponent)} compares the
+   * {@code components} field with {@code List.equals()}, which falls back to child object
+   * identity since no component class overrides {@code Object.equals()} - two structurally
+   * identical composites built from different object graphs (e.g. an original and its clone)
+   * would otherwise never compare equal, defeating the undo dirty-check in
+   * {@code Presenter.notifyProjectModifiedIfNeeded}.
+   */
+  @Override
+  public boolean equalsTo(IDIYComponent<?> other) {
+    if (!(other instanceof CompositeComponent)) {
+      return false;
+    }
+    CompositeComponent o = (CompositeComponent) other;
+    if (!Objects.equals(getName(), o.getName()) || !Objects.equals(blockName, o.blockName)
+        || !Objects.equals(value, o.value) || !Objects.equals(getAlpha(), o.getAlpha())) {
+      return false;
+    }
+    List<IDIYComponent<?>> otherComponents = o.getChildComponents();
+    if (getChildComponents().size() != otherComponents.size()) {
+      return false;
+    }
+    for (int i = 0; i < childComponents.size(); i++) {
+      if (!childComponents.get(i).equalsTo(otherComponents.get(i))) {
+        return false;
+      }
+    }
+    return true;
+  }
+}
@@ -0,0 +1,97 @@
+/*
+
+    DIY Layout Creator (DIYLC).
+    Copyright (c) 2009-2025 held jointly by the individual authors.
+
+    This file is part of DIYLC.
+
+    DIYLC is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    DIYLC is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with DIYLC.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+package org.diylc.components.composite;
+
+import java.awt.geom.Point2D;
+
+import org.diylc.common.ComponentType;
+import org.diylc.common.IComponentTransformer;
+import org.diylc.core.IDIYComponent;
+import org.diylc.presenter.ComponentProcessor;
+
+/**
+ * Rotates and mirrors a {@link CompositeComponent} by delegating to each child's own
+ * {@link IComponentTransformer}, around the same centre for every child so the assembly stays
+ * geometrically consistent. If any child's type cannot rotate (or mirror), the whole composite
+ * reports that it cannot either - silently leaving one child un-rotated would be worse (see
+ * design decision D9 in {@code docs/plans/composite-building-blocks.md}).
+ *
+ * @author Branislav Stojkovic
+ */
+public class CompositeComponentTransformer implements IComponentTransformer {
+
+  @Override
+  public boolean canRotate(IDIYComponent<?> component) {
+    CompositeComponent composite = (CompositeComponent) component;
+    if (composite.getChildComponents().isEmpty())
+      return false;
+    for (IDIYComponent<?> child : composite.getChildComponents()) {
+      if (!childTransformer(child).canRotate(child))
+        return false;
+    }
+    return true;
+  }
+
+  @Override
+  public boolean canMirror(IDIYComponent<?> component) {
+    CompositeComponent composite = (CompositeComponent) component;
+    if (composite.getChildComponents().isEmpty())
+      return false;
+    for (IDIYComponent<?> child : composite.getChildComponents()) {
+      if (!childTransformer(child).canMirror(child))
+        return false;
+    }
+    return true;
+  }
+
+  @Override
+  public boolean mirroringChangesCircuit() {
+    // This transformer instance is shared by every CompositeComponent (ComponentProcessor caches
+    // one instance per class), so it has no access to a specific composite's children here.
+    // Conservatively assume mirroring can change the circuit, so the user is always warned - a
+    // spurious confirmation is far cheaper than silently flipping a board's pinout.
+    return true;
+  }
+
+  @Override
+  public void rotate(IDIYComponent<?> component, Point2D center, int direction) {
+    CompositeComponent composite = (CompositeComponent) component;
+    for (IDIYComponent<?> child : composite.getChildComponents()) {
+      childTransformer(child).rotate(child, center, direction);
+    }
+  }
+
+  @Override
+  public void mirror(IDIYComponent<?> component, Point2D center, int direction) {
+    CompositeComponent composite = (CompositeComponent) component;
+    for (IDIYComponent<?> child : composite.getChildComponents()) {
+      childTransformer(child).mirror(child, center, direction);
+    }
+  }
+
+  @SuppressWarnings({"unchecked", "rawtypes"})
+  private IComponentTransformer childTransformer(IDIYComponent<?> child) {
+    ComponentType type =
+        ComponentProcessor.getInstance().extractComponentTypeFrom((Class) child.getClass());
+    return type.getTransformer();
+  }
+}
@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -0,0 +1,43 @@
+package org.diylc.core;
+
+import java.io.Serializable;
+import java.util.Collection;
+import java.util.List;
+import java.util.Set;
+import java.util.UUID;
+import java.util.stream.Collectors;
+
+public class ComponentGroup implements Serializable {
+
+  private Set<UUID> componentIds;
+  private String name;
+
+  public ComponentGroup(Set<UUID> componentIds) {
+    this.componentIds = componentIds;
+  }
+
+  public ComponentGroup(Set<UUID> componentIds, String name) {
+    this.componentIds = componentIds;
+    this.name = name;
+  }
+
+  public static ComponentGroup from(Collection<IDIYComponent<?>> components, String name) {
+    Set<UUID> componentIds = components.stream()
+        .map(IDIYComponent::getId)
+        .filter(id -> id != null)
+        .collect(Collectors.toSet());
+    return new ComponentGroup(componentIds, name);
+  }
+
+  public Set<UUID> getComponentIds() {
+    return componentIds;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public void setName(String name) {
+    this.name = name;
+  }
+}
@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,6 +1,6 @@
 /*
 * 
- * DIY Layout Creator (DIYLC). Copyright (c) 2009-2018 held jointly by the individual authors.
+ * DIY Layout Creator (DIYLC). Copyright (c) 2009-2025 held jointly by the individual authors.
 * 
 * This file is part of DIYLC.
 * 
@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -25,6 +25,7 @@ import java.awt.Graphics2D;
 import java.awt.geom.Point2D;
 import java.awt.geom.Rectangle2D;
 import java.io.Serializable;
+import java.util.UUID;

 import org.diylc.core.annotations.ComponentDescriptor;
 import org.diylc.core.annotations.EditableProperty;
@@ -55,6 +56,10 @@ public interface IDIYComponent<T> extends Serializable, Cloneable {
  public static final int WIRING = 5;
  public static final int TEXT = 6;

+  UUID getId();
+
+  void setId(UUID id);
+
  /**
   * @return component instance name.
   */
@@ -132,13 +137,6 @@ public interface IDIYComponent<T> extends Serializable, Cloneable {
   */
  String getInternalLinkName(int index1, int index2);
  
-  /**   
-   * @param pointIndex  
-   * @return name of the internal section containing the specified point, or null if the component does not have internal sections.
-   * One point can be shared between multiple sections, in which case, the result may contain more than one element.
-   */
-  String[] getSectionNames(int pointIndex);
-  
  /**   
   * @param pointIndex
   * @return true if the control point can move without affecting other points' position, false otherwise
@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -0,0 +1,29 @@
+/*
+
+    DIY Layout Creator (DIYLC).
+    Copyright (c) 2009-2025 held jointly by the individual authors.
+
+    This file is part of DIYLC.
+
+    DIYLC is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    DIYLC is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with DIYLC.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+package org.diylc.core;
+
+import org.diylc.core.measures.Size;
+
+public interface IHaveLength {
+
+  Size calculateLength();
+}
@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -23,13 +23,9 @@ package org.diylc.core;

 import java.awt.Font;
 import java.io.Serializable;
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.Iterator;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
+import java.util.*;
+import java.util.stream.Collectors;
+
 import org.diylc.appframework.update.VersionNumber;

 import org.diylc.core.annotations.EditableProperty;
@@ -67,6 +63,7 @@ public class Project implements Serializable, Cloneable {
  private Integer dotSpacing;
  private List<IDIYComponent<?>> components;
  private Set<Set<IDIYComponent<?>>> groups;
+  private Set<ComponentGroup> groupsEx;
  private Set<Integer> lockedLayers;
  private Set<IDIYComponent<?>> lockedComponents;
  private Set<Integer> hiddenLayers;
@@ -75,6 +72,7 @@ public class Project implements Serializable, Cloneable {
  public Project() {
    components = new ArrayList<IDIYComponent<?>>();
    groups = new HashSet<Set<IDIYComponent<?>>>();
+    groupsEx = new HashSet<>();
    lockedLayers = new HashSet<Integer>();
    hiddenLayers = new HashSet<Integer>();
    lockedComponents = new HashSet<IDIYComponent<?>>();
@@ -153,22 +151,35 @@ public class Project implements Serializable, Cloneable {

  /**
   * List of components sorted by z-order ascending.
-   * 
+   * s
   * @return
   */
  public List<IDIYComponent<?>> getComponents() {
    return components;
  }

-  /**
-   * Set of grouped components.
-   * 
-   * @return
-   */
-  public Set<Set<IDIYComponent<?>>> getGroups() {
-    return groups;
+  public Set<ComponentGroup> getGroupsEx() {
+    if (groupsEx == null) {
+      groupsEx = new HashSet<>();
+
+      if (groups != null && !groups.isEmpty()) {
+        for (Set<IDIYComponent<?>> group : groups) {
+          Set<IDIYComponent<?>> nonNullIds =
+              group.stream().filter(Objects::nonNull).collect(Collectors.toSet());
+          if (!nonNullIds.isEmpty()) {
+            ComponentGroup newGroup = ComponentGroup.from(group, null);
+            groupsEx.add(newGroup);
+          }
+        }
+        groups.clear();
+      }
+    }
+    groupsEx.removeAll(groupsEx.stream().
+        filter(x -> x.getComponentIds() == null ||
+          x.getComponentIds().stream().noneMatch(Objects::nonNull)).collect(Collectors.toSet()));
+    return groupsEx;
  }
-  
+
  public Set<IDIYComponent<?>> getLockedComponents() {
    if (lockedComponents == null)
      lockedComponents = new HashSet<IDIYComponent<?>>();
@@ -292,6 +303,11 @@ public class Project implements Serializable, Cloneable {
        return false;
    } else if (!groups.equals(other.groups))
      return false;
+    if (groupsEx == null) {
+      if (other.groupsEx != null)
+        return false;
+    } else if (!groupsEx.equals(other.groupsEx))
+      return false;
    if (lockedLayers == null) {
      if (other.lockedLayers != null)
        return false;
@@ -356,12 +372,15 @@ public class Project implements Serializable, Cloneable {
      }
    }

-    for (Set<IDIYComponent<?>> group : this.groups) {
-      Set<IDIYComponent<?>> cloneGroup = new HashSet<IDIYComponent<?>>();
-      for (IDIYComponent<?> component : group) {
-        cloneGroup.add(cloneMap.get(component));
+    for (ComponentGroup group : this.getGroupsEx()) {
+      // Filter out null IDs when cloning groups
+      Set<UUID> validIds = group.getComponentIds().stream()
+          .filter(id -> id != null)
+          .collect(Collectors.toSet());
+      // Only add group if it has valid component IDs
+      if (!validIds.isEmpty()) {
+        project.getGroupsEx().add(new ComponentGroup(validIds, group.getName()));
      }
-      project.groups.add(cloneGroup);
    }
    
    for (IDIYComponent<?> component : this.getLockedComponents()) {
@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -123,9 +123,18 @@ public @interface ComponentDescriptor {
  boolean enableDatasheet() default false;
  
  /**
-   * If datasheet is enabled, this property determines how many columns define a component, e.g. in how many steps we can instantiate a component 
-   * 
+   * If datasheet is enabled, this property determines how many columns define a component, e.g. in how many steps we can instantiate a component
+   *
   * @return
   */
  int datasheetCreationStepCount() default 0;
+
+  /**
+   * @return true if the component type should not be listed in the palette (toolbox and
+   *         component tree), while still being resolvable via
+   *         {@code ComponentProcessor.extractComponentTypeFrom} for netlist, BOM and name
+   *         generation purposes. Used by component types that are only ever created
+   *         programmatically, e.g. {@code CompositeComponent}.
+   */
+  boolean hiddenInPalette() default false;
 }
@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -27,5 +27,7 @@ import java.lang.annotation.RetentionPolicy;
@Retention(RetentionPolicy.RUNTIME)  
 public @interface PercentEditor {
  
-  public byte _100PercentValue();
+  public int minValue() default 0;
+
+  public int maxValue() default 100;
 }
@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -1,7 +1,7 @@
 /*

    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
+    Copyright (c) 2009-2025 held jointly by the individual authors.

    This file is part of DIYLC.

@@ -300,7 +300,7 @@ public class GerberG2DWrapper extends Graphics2D

  @Override
  public AffineTransform getTransform() {
-    return tx;
+    return new AffineTransform(tx);
  }

  @Override
@@ -1,80 +1,84 @@
-/*
-
-    DIY Layout Creator (DIYLC).
-    Copyright (c) 2009-2018 held jointly by the individual authors.
-
-    This file is part of DIYLC.
-
-    DIYLC is free software: you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 3 of the License, or
-    (at your option) any later version.
-
-    DIYLC is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with DIYLC.  If not, see <http://www.gnu.org/licenses/>.
-
-*/
-package org.diylc.core.images;
-
-import org.apache.log4j.Logger;
-
-import java.awt.Image;
-import java.awt.image.BufferedImage;
-import java.io.IOException;
-import javax.imageio.ImageIO;
-import javax.swing.Icon;
-import javax.swing.ImageIcon;
-
-/**
- * Loads image resources as Icons.
- * 
- * @author Branislav Stojkovic
- */
-public enum IconLoader {
-
-  Delete("delete.png"), Add("add.png"), FolderOut("folder_out.png"), Garbage("garbage.png"), DiskBlue("disk_blue.png"), SaveAs(
-      "save_as.png"), Exit("exit.png"), DocumentPlainYellow("document_plain_yellow.png"), PhotoScenery(
-      "photo_scenery.png"), LightBulbOn("lightbulb_on.png"), LightBulbOff("lightbulb_off.png"), NotebookAdd(
-      "notebook_add.png"), FormGreen("form_green.png"), Gears("gears.png"), About("about.png"), WindowColors(
-      "window_colors.png"), WindowGear("window_gear.png"), NavigateCheck("navigate_check.png"), Undo("undo.png"), Error(
-      "error.png"), Warning("warning.png"), ZoomSmall("zoom_small.png"), MoveSmall("move_small.png"), Print("print.png"), PDF(
-      "pdf.png"), Excel("excel.png"), CSV("csv.png"), HTML("html.png"), Image("image.png"), Cut("cut.png"), Copy(
-      "copy.png"), Paste("paste.png"), Selection("selection.png"), BOM("bom.png"), BlackBoard("blackboard.png"), IdCard(
-      "id_card.png"), IdCardAdd("id_card_add.png"), Chest("chest.png"), Upload("upload.png"), Wrench("wrench.png"), Group(
-      "group.png"), Ungroup("ungroup.png"), TraceMask("trace_mask.png"), Faq("faq.png"), Component("component.png"), Plugin(
-      "plugin.png"), Manual("manual.png"), Donate("donate.png"), Bug("bug.png"), IconLarge("icon_large.png"), IconMedium(
-      "icon_medium.png"), IconSmall("icon_small.png"), DocumentEdit("document_edit.png"), EditComponent(
-      "edit_component.png"), Size("size.png"), Front("front.png"), Back("back.png"), Pens("pens.png"), Sort("sort.png"), ElementsSelection(
-      "elements_selection.png"), Schaller("schaller.png");
-
-  protected String name;
-
-  private IconLoader(String name) {
-    this.name = name;
-  }
-
-  public Icon getIcon() {
-    java.net.URL imgURL = getClass().getResource("/diylc-core-images/" + name);
-    if (imgURL != null) {
-      return new ImageIcon(imgURL, name);
-    } else {
-      Logger.getLogger(IconLoader.class).error("Couldn't find file: " + name);
-      return null;
-    }
-  }
-
-  public Image getImage() {
-    BufferedImage img = null;
-    try {
-      img = ImageIO.read(getClass().getResourceAsStream("/diylc-core-images/" + name));
-    } catch (IOException e) {
-      Logger.getLogger(IconLoader.class).error("Couldn't find file: " + name);
-    }
-    return img;
-  }
-}
+/*
+
+    DIY Layout Creator (DIYLC).
+    Copyright (c) 2009-2025 held jointly by the individual authors.
+
+    This file is part of DIYLC.
+
+    DIYLC is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    DIYLC is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with DIYLC.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+package org.diylc.core.images;
+
+import org.apache.log4j.Logger;
+
+import javax.imageio.ImageIO;
+import javax.swing.*;
+import java.awt.*;
+import java.awt.image.BufferedImage;
+import java.io.IOException;
+
+/**
+ * Loads image resources as Icons.
+ *
+ * @author Branislav Stojkovic
+ */
+public enum IconLoader {
+
+  About("about.png"), Add("add.png"), BOM("bom.png"), Back("back.png"), BlackBoard(
+      "blackboard.png"), Bug("bug.png"), CSV("csv.png"), Chest("chest.png"), Component(
+      "component.png"), Copy("copy.png"), Cut("cut.png"), Delete("delete.png"), DiskBlue(
+      "disk_blue.png"), DocumentEdit("document_edit.png"), DocumentPlainYellow(
+      "document_plain_yellow.png"), Donate("donate.png"), EditComponent(
+      "edit_component.png"), ElementsSelection("elements_selection.png"), Error("error.png"), Excel(
+      "excel.png"), Exit("exit.png"), Faq("faq.png"), FolderOut("folder_out.png"), FormGreen(
+      "form_green.png"), Front("front.png"), Garbage("garbage.png"), Gears("gears.png"), Group(
+      "group.png"), HTML("html.png"), IconLarge("icon_large.png"), IconMedium(
+      "icon_medium.png"), IconSmall("icon_small.png"), IdCard("id_card.png"), IdCardAdd(
+      "id_card_add.png"), Image("image.png"), LightBulbOff("lightbulb_off.png"), LightBulbOn(
+      "lightbulb_on.png"), Manual("manual.png"), MoveSmall("move_small.png"), NavigateCheck(
+      "navigate_check.png"), NotebookAdd("notebook_add.png"), PDF("pdf.png"), Paste(
+      "paste.png"), Pens("pens.png"), PhotoScenery("photo_scenery.png"), Plugin(
+      "plugin.png"), Print("print.png"), SaveAs("save_as.png"), Schaller("schaller.png"), Selection(
+      "selection.png"), Size("size.png"), Sort("sort.png"), TraceMask("trace_mask.png"), Undo(
+      "undo.png"), Ungroup("ungroup.png"), Upload("upload.png"), Warning(
+      "warning.png"), WindowColors("window_colors.png"), WindowGear("window_gear.png"), Wrench(
+      "wrench.png"), ZoomSmall("zoom_small.png");
+
+  protected String name;
+
+  private IconLoader(String name) {
+    this.name = name;
+  }
+
+  public Icon getIcon() {
+    java.net.URL imgURL = getClass().getResource("/diylc-core-images/" + name);
+    if (imgURL != null) {
+      return new ImageIcon(imgURL, name);
+    } else {
+      Logger.getLogger(IconLoader.class).error("Couldn't find file: " + name);
+      return null;
+    }
+  }
+
+  public Image getImage() {
+    BufferedImage img = null;
+    try {
+      img = ImageIO.read(getClass().getResourceAsStream("/diylc-core-images/" + name));
+    } catch (IOException e) {
+      Logger.getLogger(IconLoader.class).error("Couldn't find file: " + name);
+    }
+    return img;
+  }
+}
--- a/Show More
+++ b/Show More