Traces, curved traces, ground fills, solder pads and PCB text call their layer 'Board Side', like every other part, and count as Board Side components in code; the saved field is still 'layer'

diylc/catalog_full.json

@@ -1011,12 +1011,17 @@
     "namePrefix" : "Trace",
     "description" : "Straight copper trace",
     "creationMethod" : "POINT_BY_POINT",
-    "notes" : [ "Use for copper on PCB layouts; for a wire link use Jumper or Hookup Wire", "A single straight segment on the copper side chosen by 'Layer'; chain segments end to end for bends, or use Curved Trace", "The whole length is copper: any terminal or copper on the same layer that it touches or crosses is connected, not just its ends, so traces of different nets must not cross" ],
+    "notes" : [ "Use for copper on PCB layouts; for a wire link use Jumper or Hookup Wire", "A single straight segment on the copper side chosen by 'Board Side'; chain segments end to end for bends, or use Curved Trace", "The whole length is copper: any terminal or copper on the same layer that it touches or crosses is connected, not just its ends, so traces of different nets must not cross" ],
     "properties" : [ {
       "name" : "Alpha",
       "type" : "Percentage",
       "format" : "number without the % sign, e.g. 100",
       "defaultValue" : "100"
+    }, {
+      "name" : "Board Side",
+      "type" : "PCBLayer",
+      "possibleValues" : [ "_1", "_2" ],
+      "defaultValue" : "_1"
     }, {
       "name" : "Color",
       "type" : "Color",
@@ -1032,11 +1037,6 @@
       "type" : "LineEndingStyle",
       "possibleValues" : [ "Round", "Flat" ],
       "defaultValue" : "Round"
-    }, {
-      "name" : "Layer",
-      "type" : "PCBLayer",
-      "possibleValues" : [ "_1", "_2" ],
-      "defaultValue" : "_1"
     }, {
       "name" : "Name",
       "type" : "String"
@@ -1064,6 +1064,11 @@
       "type" : "Percentage",
       "format" : "number without the % sign, e.g. 100",
       "defaultValue" : "100"
+    }, {
+      "name" : "Board Side",
+      "type" : "PCBLayer",
+      "possibleValues" : [ "_1", "_2" ],
+      "defaultValue" : "_1"
     }, {
       "name" : "Color",
       "type" : "Color",
@@ -1074,11 +1079,6 @@
       "type" : "LineEndingStyle",
       "possibleValues" : [ "Round", "Flat" ],
       "defaultValue" : "Round"
-    }, {
-      "name" : "Layer",
-      "type" : "PCBLayer",
-      "possibleValues" : [ "_1", "_2" ],
-      "defaultValue" : "_1"
     }, {
       "name" : "Name",
       "type" : "String"
@@ -1269,6 +1269,11 @@
       "type" : "Percentage",
       "format" : "number without the % sign, e.g. 100",
       "defaultValue" : "100"
+    }, {
+      "name" : "Board Side",
+      "type" : "PCBLayer",
+      "possibleValues" : [ "_1", "_2" ],
+      "defaultValue" : "_1"
     }, {
       "name" : "Color",
       "type" : "Color",
@@ -1279,11 +1284,6 @@
       "type" : "PointCount",
       "possibleValues" : [ "_3", "_4", "_5", "_6", "_7", "_8" ],
       "defaultValue" : "_4"
-    }, {
-      "name" : "Layer",
-      "type" : "PCBLayer",
-      "possibleValues" : [ "_1", "_2" ],
-      "defaultValue" : "_1"
     }, {
       "name" : "Name",
       "type" : "String"
@@ -1697,6 +1697,11 @@
       "type" : "Percentage",
       "format" : "number without the % sign, e.g. 100",
       "defaultValue" : "100"
+    }, {
+      "name" : "Board Side",
+      "type" : "PCBLayer",
+      "possibleValues" : [ "_1", "_2" ],
+      "defaultValue" : "_1"
     }, {
       "name" : "Color",
       "type" : "Color",
@@ -1713,11 +1718,6 @@
       "type" : "HoleType",
       "possibleValues" : [ "NONE", "PTH", "NTPH" ],
       "defaultValue" : "NTPH"
-    }, {
-      "name" : "Layer",
-      "type" : "PCBLayer",
-      "possibleValues" : [ "_1", "_2" ],
-      "defaultValue" : "_1"
     }, {
       "name" : "Node Name",
       "type" : "String"
@@ -12013,6 +12013,11 @@
     "description" : "Mirrored text for PCB artwork",
     "creationMethod" : "SINGLE_CLICK",
     "properties" : [ {
+      "name" : "Board Side",
+      "type" : "PCBLayer",
+      "possibleValues" : [ "_1", "_2" ],
+      "defaultValue" : "_1"
+    }, {
       "name" : "Color",
       "type" : "Color",
       "format" : "hex",
@@ -12037,11 +12042,6 @@
       "type" : "HorizontalAlignment",
       "possibleValues" : [ "LEFT", "CENTER", "RIGHT" ],
       "defaultValue" : "CENTER"
-    }, {
-      "name" : "Layer",
-      "type" : "PCBLayer",
-      "possibleValues" : [ "_1", "_2" ],
-      "defaultValue" : "_1"
     }, {
       "name" : "Orientation",
       "type" : "Orientation",

diylc/diylc-core/src/main/java/org/diylc/core/IBoardSideComponent.java

@@ -24,11 +24,11 @@ package org.diylc.core;
 import org.diylc.common.PCBLayer;
 
 /**
- * Interface for components mounted on one side of a board, such as a resistor or an IC. The side
+ * Interface for components on one side of a board, such as a resistor, an IC or a trace. The side
  * says where the part sits physically; it is separate from {@link ILayeredComponent}, which drives
  * continuity, because the leads of a through-hole part connect to copper on both sides whichever
- * side the part is mounted on. Components whose copper already has a layer (traces, pads, ground
- * fills) do not implement it.
+ * side the part is mounted on. Copper implements it through {@link IPCBLayerComponent}, whose layer
+ * is its side and also drives its continuity.
  * 
  * @author Branislav Stojkovic
  */

diylc/diylc-core/src/main/java/org/diylc/core/IPCBLayerComponent.java

@@ -25,14 +25,27 @@ import org.diylc.common.PCBLayer;
 
 /**
  * Interface for copper drawn on a layer of a PCB, such as a trace, pad, ground fill or PCB text.
- * Unlike {@link IBoardSideComponent}, the layer is where the copper itself is, and it also decides
- * which other copper it connects to.
+ * The layer is the copper's board side, shown to the user as 'Board Side', but unlike the side of a
+ * mounted part it also decides which other copper the copper connects to.
  * 
  * @author Branislav Stojkovic
  */
-public interface IPCBLayerComponent {
+public interface IPCBLayerComponent extends IBoardSideComponent {
 
   PCBLayer getLayer();
 
   void setLayer(PCBLayer layer);
+
+  /**
+   * @return the layer, with the deprecated inner layers counted as the bottom
+   */
+  @Override
+  default PCBLayer getBoardSide() {
+    return getLayer() == PCBLayer._2 ? PCBLayer._2 : PCBLayer._1;
+  }
+
+  @Override
+  default void setBoardSide(PCBLayer boardSide) {
+    setLayer(boardSide);
+  }
 }

diylc/diylc-core/src/main/java/org/diylc/presenter/MirrorPlacement.java

@@ -26,12 +26,11 @@ import java.util.Collection;
 import org.diylc.common.PCBLayer;
 import org.diylc.core.IBoardSideComponent;
 import org.diylc.core.IDIYComponent;
-import org.diylc.core.IPCBLayerComponent;
 
 /**
- * Puts components placed through an Underside Display mirror on the bottom of the board. A part
- * that is mounted on a side goes to the bottom, copper with a {@link PCBLayer} goes to the bottom
- * layer, and anything else is left as it is. Nothing is mirrored.
+ * Puts components placed through an Underside Display mirror on the bottom of the board. Parts and
+ * copper that have a board side go to the bottom, and anything else is left as it is. Nothing is
+ * mirrored.
  */
 public class MirrorPlacement {
 
@@ -42,8 +41,6 @@ public class MirrorPlacement {
     for (IDIYComponent<?> component : components) {
       if (component instanceof IBoardSideComponent sided) {
         sided.setBoardSide(PCBLayer._1);
-      } else if (component instanceof IPCBLayerComponent copper) {
-        copper.setLayer(PCBLayer._1);
       }
     }
   }

diylc/diylc-core/src/main/resources/update.xml

@@ -657,6 +657,10 @@
 					<changeType>IMPROVEMENT</changeType>
 					<description>Inner layers 1 to 6 are no longer offered for traces, pads and other copper, since boards are two-sided; projects that use them still open unchanged</description>
 				</org.diylc.appframework.update.Change>
+				<org.diylc.appframework.update.Change>
+					<changeType>IMPROVEMENT</changeType>
+					<description>The 'Layer' property of traces, curved traces, ground fills, solder pads and PCB text is now called 'Board Side', the same as on resistors, ICs and other parts</description>
+				</org.diylc.appframework.update.Change>
 				<org.diylc.appframework.update.Change>
 					<changeType>BUG_FIX</changeType>
 					<description>Rotated labels in pasted components and building blocks were drawn in the wrong place and at the wrong angle while following the mouse, until the components were placed</description>

diylc/diylc-library/src/main/java/org/diylc/components/connectivity/CopperTrace.java

@@ -52,7 +52,7 @@ import org.diylc.core.measures.Size;
 import org.diylc.core.measures.SizeUnit;
 
 @AiNote(value = "Use for copper on PCB layouts; for a wire link use Jumper or Hookup Wire", scope = Scope.SELECTION)
-@AiNote("A single straight segment on the copper side chosen by 'Layer'; chain segments end to end for bends, or use Curved Trace")
+@AiNote("A single straight segment on the copper side chosen by 'Board Side'; chain segments end to end for bends, or use Curved Trace")
 @AiNote("The whole length is copper: any terminal or copper on the same layer that it touches or crosses is connected, not just its ends, so traces of different nets must not cross")
 @ComponentDescriptor(name = "Copper Trace", author = "Branislav Stojkovic", category = "Connectivity",
     creationMethod = CreationMethod.POINT_BY_POINT, instanceNamePrefix = "Trace",
@@ -117,7 +117,7 @@ public class CopperTrace extends AbstractLeadedComponent<Void>
     this.thickness = thickness;
   }
 
-  @EditableProperty
+  @EditableProperty(name = "Board Side")
   @Override
   public PCBLayer getLayer() {
     if (layer == null) {

diylc/diylc-library/src/main/java/org/diylc/components/connectivity/CurvedTrace.java

@@ -105,7 +105,7 @@ public class CurvedTrace extends AbstractCurvedComponent<Void>
     this.size = size;
   }
 
-  @EditableProperty
+  @EditableProperty(name = "Board Side")
   @Override
   public PCBLayer getLayer() {
     if (layer == null) {

diylc/diylc-library/src/main/java/org/diylc/components/connectivity/GroundFill.java

@@ -152,7 +152,7 @@ public class GroundFill extends AbstractTransparentComponent<Void>
     this.pointCount = pointCount;
   }
 
-  @EditableProperty
+  @EditableProperty(name = "Board Side")
   @Override
   public PCBLayer getLayer() {
     if (layer == null) {

diylc/diylc-library/src/main/java/org/diylc/components/connectivity/SolderPad.java

@@ -190,7 +190,7 @@ public class SolderPad extends AbstractTransparentComponent<Void>
     this.holeSize = holeSize;
   }
 
-  @EditableProperty
+  @EditableProperty(name = "Board Side")
   @Override
   public PCBLayer getLayer() {
     if (layer == null) {

diylc/diylc-library/src/main/java/org/diylc/components/misc/PCBText.java

@@ -325,7 +325,7 @@ public class PCBText extends AbstractComponent<Void>
     this.horizontalAlignment = alignment;
   }
   
-  @EditableProperty
+  @EditableProperty(name = "Board Side")
   @Override
   public PCBLayer getLayer() {
     if (layer == null) {

diylc/diylc-library/src/test/java/org/diylc/components/BoardSideComponentsTest.java

@@ -29,9 +29,11 @@ import java.util.ArrayList;
 import java.util.List;
 
 import org.diylc.common.PCBLayer;
+import org.diylc.components.connectivity.CopperTrace;
 import org.diylc.components.misc.Label;
 import org.diylc.core.IBoardSideComponent;
 import org.diylc.core.IDIYComponent;
+import org.diylc.core.IPCBLayerComponent;
 import org.diylc.core.gerber.GerberLayer;
 import org.diylc.core.gerber.IGerberComponentSimple;
 import org.diylc.utils.ReflectionUtils;
@@ -73,10 +75,26 @@ public class BoardSideComponentsTest {
     }
   }
 
+  // copper starts on the bottom, where single-sided boards carry it
+  @Test
+  public void testCopperBoardSideIsItsLayer() {
+    CopperTrace trace = new CopperTrace();
+    assertEquals(PCBLayer._1, trace.getBoardSide());
+
+    trace.setBoardSide(PCBLayer._2);
+    assertEquals(PCBLayer._2, trace.getLayer());
+
+    // the deprecated inner layers are inside the board, which counts as the bottom
+    trace.setLayer(PCBLayer._3);
+    assertEquals(PCBLayer._1, trace.getBoardSide());
+  }
+
+  // parts, which start on top; copper starts on the bottom and is covered above
   private static List<IDIYComponent<?>> createBoardSideComponents() throws Exception {
     List<IDIYComponent<?>> components = new ArrayList<IDIYComponent<?>>();
     for (Class<?> type : ReflectionUtils.getIndexedClasses(IDIYComponent.class)) {
       if (IBoardSideComponent.class.isAssignableFrom(type)
+          && !IPCBLayerComponent.class.isAssignableFrom(type)
           && !Modifier.isAbstract(type.getModifiers())) {
         components.add((IDIYComponent<?>) type.getDeclaredConstructor().newInstance());
       }

diylc/diylc-library/src/test/java/org/diylc/plugins/chatbot/service/ComponentCatalogGeneratorTest.java

@@ -98,7 +98,7 @@ public class ComponentCatalogGeneratorTest {
     assertTrue("a switch carries its switching table", variants.get(0).containsKey("switching"));
 
     // the deprecated inner layers are kept only so that old files load
-    Map<String, Object> layer = findProperty(find(components, "connectivity.CopperTrace"), "Layer");
+    Map<String, Object> layer = findProperty(find(components, "connectivity.CopperTrace"), "Board Side");
     assertEquals(List.of("_1", "_2"), layer.get("possibleValues"));
   }
 

diylc/docs/plans/bottom-side-components.md

@@ -27,8 +27,12 @@ projects; the open questions below remain.
 - `IBoardSideComponent.sideOf(component)` is the one place that answers which side a component is
   on (Top for components without a side); drawing, the Gerber export and the silkscreen filter all
   use it. Copper that sits on a layer - `CopperTrace`, `CurvedTrace`, `GroundFill`, `SolderPad` and
-  `PCBText` - implements `IPCBLayerComponent` (`getLayer`/`setLayer`), which `PCBLayerFilter`, the
-  trace-mask print-out and `MirrorPlacement` use instead of looking the methods up by name.
+  `PCBText` - implements `IPCBLayerComponent` (`getLayer`/`setLayer`), which `PCBLayerFilter` and
+  the trace-mask print-out use to tell copper from parts. `IPCBLayerComponent` extends
+  `IBoardSideComponent`, reading and writing the side through the layer, with the deprecated inner
+  layers counted as the bottom, so copper has one side like any part. The copper's layer property
+  is shown as **Board Side**, the same as on parts; its field is still `layer`, so files are
+  unaffected.
 - A simple component's Gerber layer follows its side: the default
   `IGerberComponentSimple.getGerberLayer()` returns `SilkscreenBot` for an `IBoardSideComponent` on
   `_1` (Bottom) and `SilkscreenTop` otherwise. `GerberExporter.drawComponent`, package-private so
@@ -89,8 +93,9 @@ projects; the open questions below remain.
   - `BoardSideComponentsTest` checks that every such part starts on Top and takes Bottom, and
     that every part writing `SilkscreenTop` has a side, so a new part cannot be left out by
     accident.
-- `CopperTrace`, `CurvedTrace`, `GroundFill`, `SolderPad`, `PCBText` and `DrillHole` do **not**
-  implement it. Their `PCBLayer` already says where they are.
+- `CopperTrace`, `CurvedTrace`, `GroundFill`, `SolderPad` and `PCBText` implement it through
+  `IPCBLayerComponent`, and start on the bottom. `DrillHole` goes through the board and has no
+  side.
 
 ### diylc-swing
 
@@ -137,8 +142,7 @@ order.
   the part lands on the grid, and `DrawingManager.setSlotMirrorBoard` draws the part being placed
   through that mirror, under the cursor, seen from below like the parts already there. The board is
   forgotten when a project is loaded. On placement, `MirrorPlacement.placeOnBottom` sets an
-  `IBoardSideComponent` to `_1` (Bottom) and an `IPCBLayerComponent` to layer `_1`; nothing is
-  mirrored. Anything else, such as
+  `IBoardSideComponent`, part or copper, to `_1` (Bottom); nothing is mirrored. Anything else, such as
   a jumper, eyelet or wire, is placed at the reflected point unchanged. A part dragged in from
   the component tree or the toolbox goes through `Presenter.dragOver` and `dragEnded` instead,
   which pick the mirror and put the part on the bottom the same way.