ground work for graph analysis

diylc/diylc-core/src/org/diylc/common/IGraphProcessor.java

@@ -0,0 +1,32 @@
+/*
+
+    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.common;
+
+import java.util.Map;
+
+import org.diylc.graph.Graph;
+import org.diylc.graph.GraphKey;
+
+public interface IGraphProcessor {
+
+  Map<GraphKey, Graph> extractGraphs();
+}

diylc/diylc-core/src/org/diylc/common/IPlugInPort.java

@@ -53,7 +53,7 @@ import org.diylc.core.Theme;
  * @see EventType
  */
 public interface IPlugInPort extends ISelectionProcessor, IMouseProcessor, IKeyProcessor, IVariantProcessor,
-    IBlockProcessor {
+    IBlockProcessor, IGraphProcessor {
 
   public static final String ANTI_ALIASING_KEY = "antiAliasing";
   public static final String HI_QUALITY_RENDER_KEY = "hiQualityRender";

diylc/diylc-core/src/org/diylc/components/AbstractComponent.java

@@ -35,7 +35,7 @@ import java.lang.reflect.Array;
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
 import java.util.Arrays;
-
+
 import org.diylc.common.HorizontalAlignment;
 import org.diylc.common.VerticalAlignment;
 import org.diylc.core.IDIYComponent;
@@ -279,5 +279,10 @@ public abstract class AbstractComponent<T> implements IDIYComponent<T> {
       return Arrays.equals((Object[]) o1, (Object[]) o2);
     }
     return o1.equals(o2);
+  }
+  
+  @Override
+  public String getControlPointNodeName(int index) {
+    return getName() + "." + index;
   }
 }

diylc/diylc-core/src/org/diylc/core/IDIYComponent.java

@@ -110,8 +110,18 @@ public interface IDIYComponent<T> extends Serializable {
    *         same component</b>. The other control point must be able to overlap too.
    */
   boolean canControlPointOverlap(int index);
-
+
-  VisibilityPolicy getControlPointVisibilityPolicy(int index);
+  /**  
+   * @param index
+   * @return {@link VisibilityPolicy} of the control point.
+   */
+  VisibilityPolicy getControlPointVisibilityPolicy(int index);
+  
+  /**  
+   * @param index
+   * @return name of the control point node, if the control point represents a graph node, null otherwise.
+   */
+  String getControlPointNodeName(int index);
 
   /**
    * Draws the component onto the {@link Graphics2D}.
@@ -153,5 +163,5 @@ public interface IDIYComponent<T> extends Serializable {
    * @param other
    * @return
    */
-  boolean equalsTo(IDIYComponent<?> other);
+  boolean equalsTo(IDIYComponent<?> other); 
 }

diylc/diylc-core/src/org/diylc/core/ISwitch.java

@@ -0,0 +1,51 @@
+/*
+
+    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;
+
+/**
+ * Interface for all component that can act as switches. They must have at least one position.
+ * 
+ * @author Branislav Stojkovic
+ */
+public interface ISwitch {
+
+  /**
+   * @return a positive number of positions.
+   */
+  int getPositionCount();
+  
+  /**   
+   * @param position
+   * @return name of switch positions, e.g. "ON", "OFF"...
+   */
+  String getPositionName(int position);
+  
+  /**
+   * Tests control point connectivity.
+   *  
+   * @param index1
+   * @param index2
+   * @param position
+   * @return true if the two points are connected in the given switch position, false otherwise.
+   */
+  boolean arePointsConnected(int index1, int index2, int position);
+}

diylc/diylc-core/src/org/diylc/graph/Graph.java

@@ -1,25 +1,29 @@
 package org.diylc.graph;
 
-import java.util.Dictionary;
+import java.util.HashSet;
 import java.util.Set;
 
 public class Graph {
   
-  private Dictionary<String, Position> positions;
+  private Set<Vertex> vertices = new HashSet<Vertex>();
-  private Set<Node> nodes;
 
-  public Graph() {
+  public Graph() {    
   }
 
-  public Dictionary<String, Position> getPositions() {
+  public Set<Vertex> getVertices() {
-    return positions;
+    return vertices;
-  }
-
-  public Set<Node> getNodes() {
-    return nodes;
   }
   
-  public boolean nodesMatch(Graph other) {
+  public boolean verticesMatch(Graph other) {
-    return this.nodes.equals(other.nodes);
+    return this.vertices.equals(other.vertices);
+  }
+  
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    for (Vertex v : vertices) {
+      sb.append("\t").append(v.getNode1()).append(" - ").append(v.getNode2()).append("\n");
+    }
+    return sb.toString();
   }
 }

diylc/diylc-core/src/org/diylc/graph/GraphKey.java

@@ -0,0 +1,54 @@
+package org.diylc.graph;
+
+import java.util.List;
+
+public class GraphKey {
+  
+  private List<Position> positions;
+
+  public GraphKey(List<Position> positions) {
+    super();
+    this.positions = positions;
+  }
+
+  public List<Position> getPositions() {
+    return positions;
+  }
+
+  @Override
+  public int hashCode() {
+    final int prime = 31;
+    int result = 1;
+    result = prime * result + ((positions == null) ? 0 : positions.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;
+    GraphKey other = (GraphKey) obj;
+    if (positions == null) {
+      if (other.positions != null)
+        return false;
+    } else if (!positions.equals(other.positions))
+      return false;
+    return true;
+  }
+  
+  @Override
+  public String toString() {   
+    StringBuilder sb = new StringBuilder();
+    for (Position s : positions)
+    {
+      if (sb.length() > 0)
+        sb.append(":");
+      sb.append(s.toString());      
+    }
+    return sb.toString();
+  }
+}

diylc/diylc-core/src/org/diylc/graph/Node.java

@@ -1,24 +1,25 @@
 package org.diylc.graph;
 
+import org.diylc.core.IDIYComponent;
+
 
 public class Node {
 
-  private String type;
+  private IDIYComponent<?> component;
-  private String component;
+  private int pointIndex;
-  private String terminal;
 
-  public Node() {}
+  public Node(IDIYComponent<?> component, int pointIndex) {
-
+    super();
-  public String getType() {
+    this.component = component;
-    return type;
+    this.pointIndex = pointIndex;
   }
 
-  public String getComponent() {
+  public IDIYComponent<?> getComponent() {
     return component;
   }
 
-  public String getTerminal() {
+  public int getPointIndex() {
-    return terminal;
+    return pointIndex;
   }
 
   @Override
@@ -26,8 +27,7 @@ public class Node {
     final int prime = 31;
     int result = 1;
     result = prime * result + ((component == null) ? 0 : component.hashCode());
-    result = prime * result + ((terminal == null) ? 0 : terminal.hashCode());
+    result = prime * result + pointIndex;
-    result = prime * result + ((type == null) ? 0 : type.hashCode());
     return result;
   }
 
@@ -45,21 +45,13 @@ public class Node {
         return false;
     } else if (!component.equals(other.component))
       return false;
-    if (terminal == null) {
+    if (pointIndex != other.pointIndex)
-      if (other.terminal != null)
-        return false;
-    } else if (!terminal.equals(other.terminal))
-      return false;
-    if (type == null) {
-      if (other.type != null)
-        return false;
-    } else if (!type.equals(other.type))
       return false;
     return true;
   }
 
   @Override
   public String toString() {
-    return type + "." + component + "." + terminal;
+    return component.getName() + "." + pointIndex + " @ (" + component.getControlPoint(pointIndex).getX() + ":" + component.getControlPoint(pointIndex).getY() + ")";
   }
 }

diylc/diylc-core/src/org/diylc/graph/Position.java

@@ -1,33 +1,33 @@
 package org.diylc.graph;
 
+import org.diylc.core.IDIYComponent;
+import org.diylc.core.ISwitch;
+
 public class Position {
 
-  private String ownerType;
+  private ISwitch theSwitch;
-  private String owner;
+  private int position;
-  private String name;
+
-  
+  public Position(ISwitch theSwitch, int position) {
-  public Position() {    
+    super();
+    this.theSwitch = theSwitch;
+    this.position = position;
   }
 
-  public String getOwnerType() {
+  public ISwitch getSwitch() {
-    return ownerType;
+    return theSwitch;
   }
 
-  public String getOwner() {
+  public int getPosition() {
-    return owner;
+    return position;
-  }
-
-  public String getName() {
-    return name;
   }
 
   @Override
   public int hashCode() {
     final int prime = 31;
     int result = 1;
-    result = prime * result + ((name == null) ? 0 : name.hashCode());
+    result = prime * result + position;
-    result = prime * result + ((owner == null) ? 0 : owner.hashCode());
+    result = prime * result + ((theSwitch == null) ? 0 : theSwitch.hashCode());
-    result = prime * result + ((ownerType == null) ? 0 : ownerType.hashCode());
     return result;
   }
 
@@ -40,26 +40,18 @@ public class Position {
     if (getClass() != obj.getClass())
       return false;
     Position other = (Position) obj;
-    if (name == null) {
+    if (position != other.position)
-      if (other.name != null)
-        return false;
-    } else if (!name.equals(other.name))
       return false;
-    if (owner == null) {
+    if (theSwitch == null) {
-      if (other.owner != null)
+      if (other.theSwitch != null)
         return false;
-    } else if (!owner.equals(other.owner))
+    } else if (!theSwitch.equals(other.theSwitch))
-      return false;
-    if (ownerType == null) {
-      if (other.ownerType != null)
-        return false;
-    } else if (!ownerType.equals(other.ownerType))
       return false;
     return true;
   }
 
   @Override
   public String toString() {
-    return ownerType + "." + owner + "." + name;
+    return (theSwitch instanceof IDIYComponent<?> ? ((IDIYComponent<?>) theSwitch).getName() + "." : "") + theSwitch.getPositionName(position);
   }
 }

diylc/diylc-core/src/org/diylc/graph/Vertex.java

@@ -5,7 +5,9 @@ public class Vertex {
   private Node node1;
   private Node node2;
 
-  public Vertex() {
+  public Vertex(Node node1, Node node2) {
+    this.node1 = node1;
+    this.node2 = node2;
   }
 
   public Node getNode1() {

diylc/diylc-core/src/org/diylc/presenter/DrawingManager.java

@@ -486,20 +486,33 @@ public class DrawingManager {
     ConfigurationManager.getInstance().writeValue(IPlugInPort.THEME_KEY, theme);
     messageDispatcher.dispatchMessage(EventType.REPAINT);
   }
-
+  
-  @SuppressWarnings("unchecked")
   public void findContinuityAreaAtPoint(Project project, Point p) {
+    List<Area> areas = getContinuityAreas(project);
+
+    for (Area a : areas) {
+      if (a.contains(p)) {
+        continuityArea = a;
+        return;
+      }
+    }
+
+    continuityArea = null;
+  }
+  
+  @SuppressWarnings("unchecked")
+  public List<Area> getContinuityAreas(Project project) {
     // Find all individual continuity areas for all components
     List<Area> preliminaryAreas = new ArrayList<Area>();
     List<Boolean> checkBreakout = new ArrayList<Boolean>();
-    List<Connection> connections = new ArrayList<Connection>();
+    List<Line2D> connections = new ArrayList<Line2D>();
     for (IDIYComponent<?> c : project.getComponents()) {
       ComponentArea a = getComponentArea(c);
 
       ComponentType type =
           ComponentProcessor.getInstance().extractComponentTypeFrom((Class<? extends IDIYComponent<?>>) c.getClass());
       if (type.isContinuity()) {
-        connections.add(new Connection(c.getControlPoint(0), c.getControlPoint(c.getControlPointCount() - 1)));
+        connections.add(new Line2D.Double(c.getControlPoint(0), c.getControlPoint(c.getControlPointCount() - 1)));
       }
 
       if (a == null || a.getOutlineArea() == null)
@@ -532,18 +545,18 @@ public class DrawingManager {
     }
 
     crunchAreas(areas, connections);
-
+    
-    for (Area a : areas) {
+    return areas;
-      if (a.contains(p)) {
-        continuityArea = a;
-        return;
-      }
-    }
-
-    continuityArea = null;
   }
 
-  private boolean crunchAreas(List<Area> areas, List<Connection> connections) {
+  /**
+   * Merges all areas that either overlap or are joined by connections.
+   * 
+   * @param areas
+   * @param connections
+   * @return
+   */
+  private boolean crunchAreas(List<Area> areas, List<Line2D> connections) {
     boolean isChanged = false;
 
     List<Area> newAreas = new ArrayList<Area>();
@@ -564,8 +577,8 @@ public class DrawingManager {
           a1.add(a2);
           consumed.set(j, true);
         } else { // maybe there's a connection between them
-          for (Connection p : connections) {
+          for (Line2D p : connections) {
-            if ((a1.contains(p.pointA) && a2.contains(p.pointB)) || (a1.contains(p.pointB) && a2.contains(p.pointA))) {
+            if ((a1.contains(p.getP1()) && a2.contains(p.getP2())) || (a1.contains(p.getP2()) && a2.contains(p.getP1()))) {
               a1.add(a2);
               consumed.set(j, true);
               break;
@@ -624,24 +637,4 @@ public class DrawingManager {
 
     return toReturn;
   }
-
-  class Connection {
-
-    private Point pointA;
-    private Point pointB;
-
-    public Connection(Point pointA, Point pointB) {
-      super();
-      this.pointA = pointA;
-      this.pointB = pointB;
-    }
-
-    public Point getPointA() {
-      return pointA;
-    }
-
-    public Point getPointB() {
-      return pointB;
-    }
-  }
 }

diylc/diylc-core/src/org/diylc/presenter/Presenter.java

@@ -24,6 +24,7 @@ import java.awt.Point;
 import java.awt.Rectangle;
 import java.awt.dnd.DnDConstants;
 import java.awt.geom.Area;
+import java.awt.geom.Line2D;
 import java.awt.geom.Point2D;
 import java.awt.geom.Rectangle2D;
 import java.io.BufferedInputStream;
@@ -67,6 +68,7 @@ import org.diylc.common.PropertyWrapper;
 import org.diylc.common.VariantPackage;
 import org.diylc.core.ExpansionMode;
 import org.diylc.core.IDIYComponent;
+import org.diylc.core.ISwitch;
 import org.diylc.core.IView;
 import org.diylc.core.Project;
 import org.diylc.core.Template;
@@ -74,6 +76,11 @@ import org.diylc.core.Theme;
 import org.diylc.core.annotations.IAutoCreator;
 import org.diylc.core.measures.Size;
 import org.diylc.core.measures.SizeUnit;
+import org.diylc.graph.Graph;
+import org.diylc.graph.GraphKey;
+import org.diylc.graph.Node;
+import org.diylc.graph.Position;
+import org.diylc.graph.Vertex;
 import org.diylc.utils.Constants;
 
 import com.thoughtworks.xstream.XStream;
@@ -2677,4 +2684,271 @@ public class Presenter implements IPlugInPort {
     
     ConfigurationManager.getInstance().writeValue(TEMPLATES_KEY, newVariantMap);
   }
+  
+  @SuppressWarnings("unchecked")
+  @Override
+  public Map<GraphKey, Graph> extractGraphs() {    
+    Map<GraphKey, Graph> result = new HashMap<GraphKey, Graph>();
+    List<Node> nodes = new ArrayList<Node>();
+    
+    List<ISwitch> switches = new ArrayList<ISwitch>();
+    for (IDIYComponent<?> c : currentProject.getComponents()) {
+      ComponentType type =
+          ComponentProcessor.getInstance().extractComponentTypeFrom((Class<? extends IDIYComponent<?>>) c.getClass());
+      // extract nodes
+      if (!type.isContinuity()) {
+        for (int i = 0; i < c.getControlPointCount(); i++) {
+          String nodeName = c.getControlPointNodeName(i);
+          if (nodeName != null) {
+            nodes.add(new Node(c, i));
+          }
+        }
+      }
+      
+      // extract switches
+      if (ISwitch.class.isAssignableFrom(type.getInstanceClass()))
+        switches.add((ISwitch)c);
+    }
+    
+    // save us the trouble
+    if (nodes.isEmpty())
+      return null;
+    
+    // if there are no switches, make one with 1 position so we get 1 result back
+    if (switches.isEmpty())
+      switches.add(new ISwitch() {
+        
+        @Override
+        public String getPositionName(int position) {
+          return "Default";
+        }
+        
+        @Override
+        public int getPositionCount() {
+          return 1;
+        }
+        
+        @Override
+        public boolean arePointsConnected(int index1, int index2, int position) {
+          return false;
+        }
+      });
+    
+    // construct all possible combinations
+    int[] positions = new int[switches.size()];
+    for (int i = 0; i < switches.size(); i++)
+      positions[i] = 0;
+    
+    // grab continuity areas
+    List<Area> continuity = drawingManager.getContinuityAreas(currentProject);
+    
+    int i = switches.size() - 1;
+    while (i >= 0) {
+      // process the current combination
+      Map<ISwitch, Integer> switchPositions = new HashMap<ISwitch, Integer>();
+      List<Position> posList = new ArrayList<Position>();
+      for (int j = 0; j < positions.length; j++) {
+        switchPositions.put(switches.get(j), positions[j]);
+        posList.add(new Position(switches.get(j), positions[j]));
+      }
+      List<Line2D> connections = getConnections(switchPositions);  
+      Graph graph = constructGraph(nodes, connections, continuity);
+      result.put(new GraphKey(posList), graph);
+      
+      // find the next combination if possible
+      if (positions[i] < switches.get(i).getPositionCount() - 1) {
+        positions[i]++;
+      } else {
+        while (i >= 0 && positions[i] == switches.get(i).getPositionCount() - 1)
+          i--;
+        if (i >= 0) {
+          positions[i]++;
+          for (int j = i + 1; j < positions.length; j++)
+            positions[j] = 0;
+          i = switches.size() - 1;
+        }        
+      }
+    }
+        
+    return result;
+  }
+  
+  private Graph constructGraph(List<Node> nodes, List<Line2D> connections, List<Area> continuityAreas) {
+    Graph graph = new Graph();
+    
+    StringBuilder sb = new StringBuilder();
+    sb.append("Nodes:").append("\n");
+    for (Node n : nodes) {
+      sb.append(n.toString()).append("\n");
+    }
+    sb.append("Connections:").append("\n");
+    for (Line2D n : connections) {
+      sb.append(n.getP1()).append(":").append(n.getP2()).append("\n");
+    }
+    LOG.debug(sb.toString());
+
+    double t = DrawingManager.CONTROL_POINT_SIZE;
+    for (int i = 0; i < nodes.size() - 1; i++)
+      for (int j = i + 1; j < nodes.size(); j++) {
+        Node node1 = nodes.get(i);
+        Node node2 = nodes.get(j);
+        Point2D point1 = node1.getComponent().getControlPoint(node1.getPointIndex());
+        Point2D point2 = node2.getComponent().getControlPoint(node2.getPointIndex());
+        
+        // try both directions
+        if (point1.distance(point2) < t || 
+            checkGraphConnection(point1, point2, connections, continuityAreas, new boolean[connections.size()]) || 
+            checkGraphConnection(point2, point1, connections, continuityAreas, new boolean[connections.size()])) {
+          graph.getVertices().add(new Vertex(node1, node2));        
+        }        
+      }
+    
+    return graph;
+  }
+  
+  private boolean checkGraphConnection(Point2D point1, Point2D point2, List<Line2D> connections,
+      List<Area> continuityAreas, boolean[] visited) {
+    double t = DrawingManager.CONTROL_POINT_SIZE;
+    
+    if (point1.distance(point2) < t)
+      return true;
+    
+    for (Area a : continuityAreas) {
+      if (a.contains(point1) && a.contains(point2))
+        return true;
+    }
+    
+    for (int i = 0; i < connections.size(); i++) {
+      if (visited[i])
+        continue;
+      
+      Line2D c = connections.get(i);
+      if (point1.distance(c.getP1()) < t) {
+        visited[i] = true;
+        if (checkGraphConnection(c.getP2(), point2, connections, continuityAreas, visited))          
+          return true;        
+      }
+      if (point1.distance(c.getP2()) < t) {
+        visited[i] = true;
+        if (checkGraphConnection(c.getP1(), point2, connections, continuityAreas, visited))          
+          return true;        
+      }
+    }
+    
+    return false;
+  }
+
+  @SuppressWarnings("unchecked")
+  private List<Line2D> getConnections(Map<ISwitch, Integer> switchPositions) {
+    List<Line2D> connections = new ArrayList<Line2D>();
+    for (IDIYComponent<?> c : currentProject.getComponents()) {
+      ComponentType type =
+          ComponentProcessor.getInstance().extractComponentTypeFrom((Class<? extends IDIYComponent<?>>) c.getClass());
+      // handle direct connections
+      if (type.isContinuity()) {
+        connections.add(new Line2D.Double(c.getControlPoint(0), c.getControlPoint(c.getControlPointCount() - 1)));
+      }
+      // handle switches
+      if (ISwitch.class.isAssignableFrom(type.getInstanceClass()) && switchPositions.containsKey(c)) {
+        int position = switchPositions.get(c);
+        ISwitch s = (ISwitch)c;
+        for (int i = 0; i < c.getControlPointCount() - 1; i++)
+          for (int j = i + 1; j < c.getControlPointCount(); j++)
+            if (s.arePointsConnected(i, j, position))
+              connections.add(new Line2D.Double(c.getControlPoint(i), c.getControlPoint(j)));
+      }
+    }   
+    
+//    // grab continuity areas
+//    List<Area> continuity = drawingManager.getContinuityAreas(currentProject);
+//    
+//    mergeConnections(connections, continuity);
+    
+    return connections;
+  }
+  
+//  private void mergeConnections(List<Line2D> connections, List<Area> continuity) {
+//    List<Line2D> merged = new ArrayList<Line2D>();
+//    boolean[] visited = new boolean[connections.size()];
+//    for (int i = 0; i < visited.length; i++)
+//      visited[i] = false;
+//    
+//    double t = DrawingManager.CONTROL_POINT_SIZE;
+//    
+//    for (int i = 0; i < visited.length - 1; i++) {
+//      if (visited[i])
+//        continue;
+//      for (int j = i + 1; j < visited.length; j++) {
+//        if (visited[j])
+//          continue;
+//        Line2D c1 = connections.get(i);
+//        Line2D c2 = connections.get(j);
+//        Point2D p1 = null;
+//        Point2D p2 = null;
+//        boolean connected = false;
+//        // test direct continuity between two connections        
+//        if (!connected && c1.getP1().distance(c2.getP1()) < t) {
+//          connected = true;
+//          p1 = c1.getP2();
+//          p2 = c2.getP2();
+//        }
+//        if (!connected && c1.getP1().distance(c2.getP2()) < t) {
+//          connected = true;
+//          p1 = c1.getP2();
+//          p2 = c2.getP1();
+//        }
+//        if (!connected && c1.getP2().distance(c2.getP1()) < t) {
+//          connected = true;
+//          p1 = c1.getP1();
+//          p2 = c2.getP2();
+//        }
+//        if (!connected && c1.getP2().distance(c2.getP2()) < t) {
+//          connected = true;
+//          p1 = c1.getP1();
+//          p2 = c2.getP1();
+//        }
+//        // if that failed, try using continuity areas
+//        if (!connected) {
+//          for (Area a : continuity) {
+//            if (!connected && a.contains(c1.getP1()) && a.contains(c2.getP1())) {
+//              connected = true;
+//              p1 = c1.getP2();
+//              p2 = c2.getP2();
+//              break;
+//            }
+//            if (!connected && a.contains(c1.getP1()) && a.contains(c2.getP2())) {
+//              connected = true;
+//              p1 = c1.getP2();
+//              p2 = c2.getP1();
+//              break;
+//            }
+//            if (!connected && a.contains(c1.getP2()) && a.contains(c2.getP1())) {
+//              connected = true;
+//              p1 = c1.getP1();
+//              p2 = c2.getP2();
+//              break;
+//            }
+//            if (!connected && a.contains(c1.getP2()) && a.contains(c2.getP2())) {
+//              connected = true;
+//              p1 = c1.getP1();
+//              p2 = c2.getP1();
+//              break;
+//            }
+//          }
+//        }
+//        
+//        if (connected) {
+//          visited[i] = visited[j] = true;
+//          merged.add(new Line2D.Double(p1, p2));
+//        }
+//      }
+//    }
+//    
+//    // replace connections with merged 
+//    if (!merged.isEmpty()) {
+////      connections.clear();
+//      connections.addAll(merged);
+//      mergeConnections(connections, continuity); // attempt another round of merging if needed
+//    }
+//  }
 }

diylc/diylc-core/test/org/diylc/testcomponents/MockDIYComponent.java

@@ -163,5 +163,10 @@ public class MockDIYComponent extends AbstractComponent<Capacitance> {
   @Override
   public void drawIcon(Graphics2D g2d, int width, int height) {
     g2d.drawString("X", 10, 10);
+  }
+
+  @Override
+  public String getControlPointNodeName(int index) {
+    return null;
   }
 }

diylc/diylc-library/src/org/diylc/components/boards/BlankBoard.java

@@ -122,6 +122,11 @@ public class BlankBoard extends AbstractBoard {
 
   public void setType(Type type) {
     this.type = type;
+  }
+  
+  @Override
+  public String getControlPointNodeName(int index) {
+    return null;
   }
 
   static enum Type {

diylc/diylc-library/src/org/diylc/components/boards/Breadboard.java

@@ -364,7 +364,12 @@ public class Breadboard extends AbstractComponent<Void> {
   }
 
   @Override
-  public void setValue(Void value) {}
+  public void setValue(Void value) {}
+  
+  @Override
+  public String getControlPointNodeName(int index) {
+    return null;
+  }
 
   public enum BreadboardSize {
     Half, Full

diylc/diylc-library/src/org/diylc/components/boards/EyeletBoard.java

@@ -119,6 +119,11 @@ public class EyeletBoard extends AbstractBoard {
 
   public void setSpacing(Size spacing) {
     this.spacing = spacing;
+  }
+  
+  @Override
+  public String getControlPointNodeName(int index) {
+    return null;
   }
 
   @Override

diylc/diylc-library/src/org/diylc/components/boards/MarshallPerfBoard.java

@@ -103,6 +103,11 @@ public class MarshallPerfBoard extends AbstractBoard {
 
   public void setSpacing(Size spacing) {
     this.spacing = spacing;
+  }
+  
+  @Override
+  public String getControlPointNodeName(int index) {
+    return null;
   }
 
   @Override

diylc/diylc-library/src/org/diylc/components/boards/PerfBoard.java

@@ -112,6 +112,11 @@ public class PerfBoard extends AbstractBoard {
 
   public void setSpacing(Size spacing) {
     this.spacing = spacing;
+  }
+  
+  @Override
+  public String getControlPointNodeName(int index) {
+    return null;
   }
 
   @Override

diylc/diylc-library/src/org/diylc/components/boards/TerminalStrip.java

@@ -449,5 +449,10 @@ public class TerminalStrip extends AbstractTransparentComponent<String> {
 
   public void setBorderColor(Color borderColor) {
     this.borderColor = borderColor;
+  }
+  
+  @Override
+  public String getControlPointNodeName(int index) {
+    return "TerminalStrip" + index;
   }
 }

diylc/diylc-library/src/org/diylc/components/boards/TriPadBoard.java

@@ -236,5 +236,10 @@ public class TriPadBoard extends AbstractBoard {
     } else {
       this.stripSpan = stripSpan;
     }
+  }
+  
+  @Override
+  public String getControlPointNodeName(int index) {
+    return null;
   }
 }

diylc/diylc-library/src/org/diylc/components/boards/VeroBoard.java

@@ -148,6 +148,11 @@ public class VeroBoard extends AbstractBoard {
 
   public void setOrientation(OrientationHV orientation) {
     this.orientation = orientation;
+  }
+  
+  @Override
+  public String getControlPointNodeName(int index) {
+    return null;
   }
 
   @Override

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

@@ -162,4 +162,9 @@ public class CopperTrace extends AbstractLeadedComponent<Void> {
   protected boolean IsCopperArea() {
     return true;
   }
+  
+  @Override
+  public String getControlPointNodeName(int index) {   
+    return null;
+  }
 }

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

@@ -111,4 +111,9 @@ public class CurvedTrace extends AbstractCurvedComponent<Void> {
   public LineStyle getStyle() {   
     return super.getStyle();
   }
+  
+  @Override
+  public String getControlPointNodeName(int index) {   
+    return null;
+  }
 }

diylc/diylc-library/src/org/diylc/components/connectivity/CutLine.java

@@ -157,4 +157,9 @@ public class CutLine extends AbstractTransparentComponent<Void> {
 
   @Override
   public void setValue(Void value) {}
+  
+  @Override
+  public String getControlPointNodeName(int index) {   
+    return null;
+  }
 }

diylc/diylc-library/src/org/diylc/components/connectivity/Dot.java

@@ -126,5 +126,10 @@ public class Dot extends AbstractComponent<Void> {
   }
 
   @Override
-  public void setValue(Void value) {}
+  public void setValue(Void value) {}
+  
+  @Override
+  public String getControlPointNodeName(int index) {   
+    return null;
+  }
 }

diylc/diylc-library/src/org/diylc/components/connectivity/Eyelet.java

@@ -164,5 +164,10 @@ public class Eyelet extends AbstractComponent<String> {
   @Override
   public void setValue(String value) {
     this.value = value;
+  }
+  
+  @Override
+  public String getControlPointNodeName(int index) {   
+    return null;
   }
 }

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

@@ -159,7 +159,12 @@ public class GroundFill extends AbstractComponent<Void> {
 
   @Deprecated
   @Override
-  public void setValue(Void value) {}
+  public void setValue(Void value) {}
+  
+  @Override
+  public String getControlPointNodeName(int index) {   
+    return null;
+  }
 
   @Override
   public void drawIcon(Graphics2D g2d, int width, int height) {

diylc/diylc-library/src/org/diylc/components/connectivity/HookupWire.java

@@ -132,5 +132,5 @@ public class HookupWire extends AbstractCurvedComponent<Void> {
 
   public void setStripeColor(Color stripeColor) {
     this.stripeColor = stripeColor;
-  }
+  }  
 }

diylc/diylc-library/src/org/diylc/components/connectivity/Line.java

@@ -262,6 +262,11 @@ public class Line extends AbstractLeadedComponent<Void> {
   @Override
   protected Size getDefaultLength() {
     return null;
+  }
+  
+  @Override
+  public String getControlPointNodeName(int index) {   
+    return null;
   }
 
   @Deprecated

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

@@ -182,6 +182,11 @@ public class SolderPad extends AbstractComponent<Void> {
   public Void getValue() {
     return null;
   }
+  
+  @Override
+  public String getControlPointNodeName(int index) {   
+    return null;
+  }
 
   @Override
   public void setValue(Void value) {}

diylc/diylc-library/src/org/diylc/components/connectivity/TraceCut.java

@@ -230,5 +230,10 @@ public class TraceCut extends AbstractComponent<Void> {
   @Override
   public String getName() {
     return super.getName();
+  }
+  
+  @Override
+  public String getControlPointNodeName(int index) {   
+    return null;
   }
 }

diylc/diylc-library/src/org/diylc/components/connectivity/Turret.java

@@ -162,5 +162,10 @@ public class Turret extends AbstractComponent<String> {
   @Override
   public void setValue(String value) {
     this.value = value;
+  }
+  
+  @Override
+  public String getControlPointNodeName(int index) {   
+    return null;
   }
 }

diylc/diylc-library/src/org/diylc/components/electromechanical/MiniRelay.java

@@ -31,7 +31,7 @@ import java.awt.Rectangle;
 import java.awt.geom.Area;
 import java.awt.geom.Rectangle2D;
 import java.awt.geom.RoundRectangle2D;
-
+
 import org.diylc.appframework.miscutils.ConfigurationManager;
 import org.diylc.common.Display;
 import org.diylc.common.IPlugInPort;
@@ -426,9 +426,7 @@ public class MiniRelay extends AbstractTransparentComponent<String> {
   }
 
   public static enum RelayType {
-
     SPDT, DPDT;
-
   }
 
   public static enum RelaySize {

diylc/diylc-library/src/org/diylc/components/electromechanical/MiniToggleSwitch.java

@@ -39,6 +39,7 @@ import org.diylc.components.AbstractTransparentComponent;
 import org.diylc.core.ComponentState;
 import org.diylc.core.IDIYComponent;
 import org.diylc.core.IDrawingObserver;
+import org.diylc.core.ISwitch;
 import org.diylc.core.Project;
 import org.diylc.core.Theme;
 import org.diylc.core.VisibilityPolicy;
@@ -52,7 +53,7 @@ import org.diylc.utils.Constants;
 @ComponentDescriptor(name = "Mini Toggle Switch", category = "Electro-Mechanical", author = "Branislav Stojkovic",
     description = "Panel mounted mini toggle switch", stretchable = false, zOrder = IDIYComponent.COMPONENT,
     instanceNamePrefix = "SW", autoEdit = false)
-public class MiniToggleSwitch extends AbstractTransparentComponent<ToggleSwitchType> {
+public class MiniToggleSwitch extends AbstractTransparentComponent<ToggleSwitchType> implements ISwitch {
 
   private static final long serialVersionUID = 1L;
 
@@ -377,5 +378,51 @@ public class MiniToggleSwitch extends AbstractTransparentComponent<ToggleSwitchT
 
   public void setBorderColor(Color borderColor) {
     this.borderColor = borderColor;
+  }
+  
+  // switch stuff
+  
+  @Override
+  public String getControlPointNodeName(int index) {
+    // we don't want the switch to produce any nodes, it just makes connections
+    return null;
+  }
+
+  @Override
+  public int getPositionCount() {
+    switch (switchType) {
+      case SPST:        
+      case SPDT:
+      case DPDT:
+      case _3PDT:
+      case _4PDT:
+      case _5PDT:
+        return 2;        
+      case _DP3T_mustang:
+        return 3;      
+    }
+    return 2;
+  }
+
+  @Override
+  public String getPositionName(int position) {
+    return Integer.toString(position);
+  }
+
+  @Override
+  public boolean arePointsConnected(int index1, int index2, int position) {
+    switch (switchType) {
+      case SPST:
+        return position == 1;
+      case SPDT:        
+      case DPDT:
+      case _3PDT:
+      case _4PDT:
+      case _5PDT:
+        return (index2 - index1) < 3 && index1 % 3 == position && index2 % 3 == position + 1;        
+      case _DP3T_mustang:
+        return (index2 - index1) < 3 && index1 % 3 == 0 && index2 % 3 == position + 1;      
+    }
+    return false;
   }
 }

diylc/diylc-library/src/org/diylc/components/electromechanical/PilotLampHolder.java

@@ -422,5 +422,5 @@ public class PilotLampHolder extends AbstractMultiPartComponent<String> {
     updateControlPoints();
     // Invalidate the body
     body = null;
-  }  
+  }
 }

diylc/diylc-library/src/org/diylc/components/electromechanical/RCAJack.java

@@ -314,5 +314,10 @@ public class RCAJack extends AbstractMultiPartComponent<String> {
     updateControlPoints();
     // Invalidate the body
     body = null;
+  }
+  
+  @Override
+  public String getControlPointNodeName(int index) {
+    return getName() + (index == 0 ? "Tip" : "Sleeve");
   }
 }

diylc/diylc-library/src/org/diylc/components/guitar/HumbuckerPickup.java

@@ -567,6 +567,11 @@ public class HumbuckerPickup extends AbstractTransparentComponent<String> {
     this.coilType2 = coilType2;
     // Invalidate the body
     body = null;
+  }
+  
+  @Override
+  public String getControlPointNodeName(int index) {
+    return "PickupTerminal";
   }
 
   public static enum HumbuckerType {

diylc/diylc-library/src/org/diylc/components/guitar/JazzBassPickup.java

@@ -325,5 +325,10 @@ public class JazzBassPickup extends AbstractTransparentComponent<String> {
 
   public void setPoleColor(Color poleColor) {
     this.poleColor = poleColor;
+  }
+  
+  @Override
+  public String getControlPointNodeName(int index) {
+    return getName() + ".PickupTerminal";
   }
 }

diylc/diylc-library/src/org/diylc/components/guitar/LPSwitch.java

@@ -31,7 +31,7 @@ import java.awt.geom.AffineTransform;
 import java.awt.geom.Area;
 import java.awt.geom.GeneralPath;
 import java.awt.geom.Rectangle2D;
-
+
 import org.diylc.appframework.miscutils.ConfigurationManager;
 import org.diylc.common.IPlugInPort;
 import org.diylc.common.ObjectCache;

diylc/diylc-library/src/org/diylc/components/guitar/LeverSwitch.java

@@ -32,7 +32,7 @@ import java.awt.geom.Area;
 import java.awt.geom.Ellipse2D;
 import java.awt.geom.Rectangle2D;
 import java.awt.geom.RoundRectangle2D;
-
+
 import org.diylc.appframework.miscutils.ConfigurationManager;
 import org.diylc.common.IPlugInPort;
 import org.diylc.common.ObjectCache;
@@ -365,8 +365,8 @@ public class LeverSwitch extends AbstractTransparentComponent<String> {
     updateControlPoints();
     // Invalidate the body
     body = null;
-  }
+  }
-
+ 
   public enum LeverSwitchType {
     DP3T("DP3T (Standard Strat)"), _4P5T("4P5T (Super/Mega)"), DP5T("DP5T");
 

diylc/diylc-library/src/org/diylc/components/guitar/P90Pickup.java

@@ -33,7 +33,7 @@ import java.awt.geom.AffineTransform;
 import java.awt.geom.Area;
 import java.awt.geom.Ellipse2D;
 import java.awt.geom.RoundRectangle2D;
-
+
 import org.diylc.appframework.miscutils.ConfigurationManager;
 import org.diylc.common.HorizontalAlignment;
 import org.diylc.common.IPlugInPort;
@@ -349,6 +349,11 @@ public class P90Pickup extends AbstractTransparentComponent<String> {
 
   public void setPoleColor(Color poleColor) {
     this.poleColor = poleColor;
+  }
+  
+  @Override
+  public String getControlPointNodeName(int index) {
+    return getName() + ".PickupTerminal";
   }
 
   public enum P90Type {

diylc/diylc-library/src/org/diylc/components/guitar/PBassPickup.java

@@ -313,5 +313,10 @@ public class PBassPickup extends AbstractTransparentComponent<String> {
 
   public void setPoleColor(Color poleColor) {
     this.poleColor = poleColor;
+  }
+  
+  @Override
+  public String getControlPointNodeName(int index) {
+    return getName() + ".PickupTerminal";
   }
 }

diylc/diylc-library/src/org/diylc/components/guitar/SingleCoilPickup.java

@@ -33,7 +33,7 @@ import java.awt.geom.Area;
 import java.awt.geom.Ellipse2D;
 import java.awt.geom.Rectangle2D;
 import java.awt.geom.RoundRectangle2D;
-
+
 import org.diylc.appframework.miscutils.ConfigurationManager;
 import org.diylc.common.HorizontalAlignment;
 import org.diylc.common.IPlugInPort;
@@ -464,6 +464,11 @@ public class SingleCoilPickup extends AbstractTransparentComponent<String> {
 
   public void setPoleColor(Color poleColor) {
     this.poleColor = poleColor;
+  }
+  
+  @Override
+  public String getControlPointNodeName(int index) {
+    return getName() + ".PickupTerminal";
   }
 
   public enum SingleCoilType {

diylc/diylc-library/src/org/diylc/components/misc/BOM.java

@@ -29,7 +29,7 @@ import java.awt.Point;
 import java.awt.geom.Rectangle2D;
 import java.util.Iterator;
 import java.util.List;
-
+
 import org.diylc.components.AbstractComponent;
 import org.diylc.core.ComponentState;
 import org.diylc.core.IDIYComponent;
@@ -58,7 +58,12 @@ public class BOM extends AbstractComponent<Void> {
   private Size size = DEFAULT_SIZE;
 
   private Point point = new Point(0, 0);
-  private Color color = COLOR;
+  private Color color = COLOR;
+  
+  @Override
+  public String getControlPointNodeName(int index) {
+    return null;
+  }
 
   @Override
   public void draw(Graphics2D g2d, ComponentState componentState, boolean outlineMode, Project project,

diylc/diylc-library/src/org/diylc/components/misc/BatterySymbol.java

@@ -24,7 +24,7 @@ package org.diylc.components.misc;
 import java.awt.Graphics2D;
 import java.awt.Shape;
 import java.awt.geom.GeneralPath;
-
+
 import org.diylc.components.AbstractSchematicLeadedSymbol;
 import org.diylc.core.CreationMethod;
 import org.diylc.core.IDIYComponent;
@@ -130,7 +130,10 @@ public class BatterySymbol extends AbstractSchematicLeadedSymbol<String> {
         * width / 32);
     g2d.drawLine(height / 2 - 6 * width / 32, height / 2 - 3 * width / 32, height / 2 - 6 * width / 32, height / 2 - 7
         * width / 32);
+  }
+  
+  @Override
+  public String getControlPointNodeName(int index) {
+    return getName() + "." + (index == 0 ? "+" : "-");
   }
-
-
 }

diylc/diylc-library/src/org/diylc/components/misc/GroundSymbol.java

@@ -25,7 +25,7 @@ import java.awt.Color;
 import java.awt.Graphics2D;
 import java.awt.Point;
 import java.awt.Polygon;
-
+
 import org.diylc.common.ObjectCache;
 import org.diylc.components.AbstractComponent;
 import org.diylc.core.ComponentState;
@@ -134,6 +134,11 @@ public class GroundSymbol extends AbstractComponent<Void> {
   @Override
   public void setControlPoint(Point point, int index) {
     this.point = point;
+  }
+  
+  @Override
+  public String getControlPointNodeName(int index) {
+    return getName();
   }
 
   @Override

diylc/diylc-library/src/org/diylc/components/misc/Image.java

@@ -27,9 +27,9 @@ import java.awt.Graphics2D;
 import java.awt.Point;
 import java.awt.Shape;
 import java.awt.geom.Rectangle2D;
-
+
 import javax.swing.ImageIcon;
-
+
 import org.diylc.appframework.miscutils.IconImageConverter;
 import org.diylc.components.AbstractTransparentComponent;
 import org.diylc.core.ComponentState;
@@ -41,7 +41,7 @@ import org.diylc.core.annotations.BomPolicy;
 import org.diylc.core.annotations.ComponentDescriptor;
 import org.diylc.core.annotations.EditableProperty;
 import org.diylc.core.annotations.PercentEditor;
-
+
 import com.thoughtworks.xstream.annotations.XStreamConverter;
 
 @ComponentDescriptor(name = "Image", author = "Branislav Stojkovic", category = "Misc",
@@ -60,6 +60,11 @@ public class Image extends AbstractTransparentComponent<Void> {
     if (imgURL != null) {
       ICON = new ImageIcon(imgURL, name);
     }
+  }
+  
+  @Override
+  public String getControlPointNodeName(int index) {
+    return null;
   }
 
   private Point point = new Point(0, 0);

diylc/diylc-library/src/org/diylc/components/misc/Label.java

@@ -282,5 +282,10 @@ public class Label extends AbstractComponent<String> {
   @Override
   public void setValue(String value) {
     this.text = value;
+  }
+  
+  @Override
+  public String getControlPointNodeName(int index) {
+    return null;
   }
 }

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

@@ -311,5 +311,10 @@ public class PCBText extends AbstractComponent<Void> {
   }
 
   @Override
-  public void setValue(Void value) {}
+  public void setValue(Void value) {}
+  
+  @Override
+  public String getControlPointNodeName(int index) {
+    return null;
+  }
 }

diylc/diylc-library/src/org/diylc/components/semiconductors/BJTSymbol.java

@@ -27,7 +27,7 @@ import java.awt.Shape;
 import java.awt.geom.AffineTransform;
 import java.awt.geom.Area;
 import java.awt.geom.GeneralPath;
-
+
 import org.diylc.common.ObjectCache;
 import org.diylc.components.Abstract3LegSymbol;
 import org.diylc.core.IDIYComponent;
@@ -116,5 +116,10 @@ public class BJTSymbol extends Abstract3LegSymbol {
     this.polarity = polarity;
 
     body = null;
+  }
+  
+  @Override
+  public String getControlPointNodeName(int index) {
+    return getName() + "." + index;
   }
 }

diylc/diylc-library/src/org/diylc/components/shapes/AbstractShape.java

@@ -104,6 +104,11 @@ public abstract class AbstractShape extends AbstractTransparentComponent<Void> {
         Math.min(controlPoints[0].y, controlPoints[1].y));
     secondPoint.setLocation(Math.max(controlPoints[0].x, controlPoints[1].x),
         Math.max(controlPoints[0].y, controlPoints[1].y));
+  }
+  
+  @Override
+  public String getControlPointNodeName(int index) {
+    return null;
   }
 
   @Deprecated

diylc/diylc-swing/update.xml

@@ -2440,7 +2440,7 @@
 				</org.diylc.appframework.update.Change>		
 				<org.diylc.appframework.update.Change>
 					<changeType>IMPROVEMENT</changeType>
-					<description>Better rendering of TO-3 transformer package</description>
+					<description>Better rendering of TO-3 transistor package</description>
 				</org.diylc.appframework.update.Change>	
 				<org.diylc.appframework.update.Change>
 					<changeType>BUG_FIX</changeType>