7 files changed, 43 insertions, 15 deletions
diff --git a/src/jcgp/gui/population/ChromosomePane.java b/src/jcgp/gui/population/ChromosomePane.java
index 7826dcc..a87a054 100644
--- a/src/jcgp/gui/population/ChromosomePane.java
+++ b/src/jcgp/gui/population/ChromosomePane.java
@@ -20,8 +20,8 @@ import jcgp.gui.GUI;
  */
 public class ChromosomePane extends ScrollPane {
 
-	private GUINode[][] guiNodes;
 	private GUIInput[] guiInputs;
+	private GUINode[][] guiNodes;
 	private GUIOutput[] guiOutputs;
 
 	private Pane content;
diff --git a/src/jcgp/gui/population/FunctionSelector.java b/src/jcgp/gui/population/FunctionSelector.java
index d96617c..14614e5 100644
--- a/src/jcgp/gui/population/FunctionSelector.java
+++ b/src/jcgp/gui/population/FunctionSelector.java
@@ -46,7 +46,7 @@ public class FunctionSelector extends VBox {
 			l.addEventFilter(MouseEvent.MOUSE_ENTERED, new EventHandler<MouseEvent>() {
 				@Override
 				public void handle(MouseEvent event) {
-					((Label) event.getSource()).setStyle("-fx-background-color: " + Constants.SOFT_HIGHLIGHT_COLOUR + "; -fx-border-color: #B0B0B0; -fx-border-width: 0 0 1 0; -fx-padding: 2");
+					((Label) event.getSource()).setStyle("-fx-background-color: " + Constants.SOFT_HIGHLIGHT_PAINT + "; -fx-border-color: #B0B0B0; -fx-border-width: 0 0 1 0; -fx-padding: 2");
 				}
 			});
 			l.addEventFilter(MouseEvent.MOUSE_EXITED, new EventHandler<MouseEvent>() {
diff --git a/src/jcgp/gui/population/GUIConnection.java b/src/jcgp/gui/population/GUIConnection.java
index c17033a..3a0ad67 100644
--- a/src/jcgp/gui/population/GUIConnection.java
+++ b/src/jcgp/gui/population/GUIConnection.java
@@ -21,4 +21,6 @@ public interface GUIConnection {
 	 */
 	public void setStateRecursively(GUIGeneState state);
 	
+	public void setLockRecursively(boolean value);
+	
 }
diff --git a/src/jcgp/gui/population/GUIGene.java b/src/jcgp/gui/population/GUIGene.java
index d6f9638..02b87e7 100644
--- a/src/jcgp/gui/population/GUIGene.java
+++ b/src/jcgp/gui/population/GUIGene.java
@@ -54,6 +54,8 @@ public abstract class GUIGene extends Group {
 
 	private Text text;
 	private Circle mainCircle;
+	
+	private int lock = 0;
 
 	/**
 	 * Initialises the {@code Text} and {@code Circle} objects so that all genes are standardised.
@@ -66,7 +68,7 @@ public abstract class GUIGene extends Group {
 		text.setWrappingWidth(Constants.NODE_RADIUS * 2);
 		text.setX(-Constants.NODE_RADIUS);
 
-		mainCircle = new Circle(Constants.NODE_RADIUS, Constants.NEUTRAL_COLOUR);
+		mainCircle = new Circle(Constants.NODE_RADIUS, Constants.NEUTRAL_PAINT);
 		mainCircle.setStroke(Paint.valueOf("black"));
 		
 		getChildren().addAll(mainCircle, text);
@@ -105,24 +107,21 @@ public abstract class GUIGene extends Group {
 	public final void setState(GUIGeneState newState) {
 		switch (newState) {
 		case NEUTRAL:
-			mainCircle.setFill(Constants.NEUTRAL_COLOUR);
-			setLinesVisible(false);
+			mainCircle.setFill(isLocked() ? Constants.HARD_HIGHLIGHT_PAINT : Constants.NEUTRAL_PAINT);
+			setLinesVisible(isLocked() ? true : false);
 			break;
 		case HOVER:
-			mainCircle.setFill(Constants.MEDIUM_HIGHLIGHT_COLOUR);
+			mainCircle.setFill(Constants.MEDIUM_HIGHLIGHT_PAINT);
 			setLinesVisible(true);
 			break;
 		case EXTENDED_HOVER:
-			mainCircle.setFill(Constants.SOFT_HIGHLIGHT_COLOUR);
-			setLinesVisible(false);
+			mainCircle.setFill(Constants.SOFT_HIGHLIGHT_PAINT);
+			setLinesVisible(isLocked() ? true : false);
 			break;
 		case ACTIVE_HOVER:
-			mainCircle.setFill(Constants.SOFT_HIGHLIGHT_COLOUR);
+			mainCircle.setFill(Constants.SOFT_HIGHLIGHT_PAINT);
 			setLinesVisible(true);
 			break;
-			
-		default:
-			break;
 		}
 		currentState = newState;
 	}
@@ -134,4 +133,18 @@ public abstract class GUIGene extends Group {
 	 * @param value the visibility value.
 	 */
 	protected abstract void setLinesVisible(boolean value);
+	
+	public boolean isLocked() {
+		return lock > 0;
+	}
+	
+	public void setLock(boolean value) {
+		if (value) {
+			lock++;
+		} else if (lock > 0) {
+			lock--;
+		} else {
+			lock = 0;
+		}
+	}
 }
diff --git a/src/jcgp/gui/population/GUIInput.java b/src/jcgp/gui/population/GUIInput.java
index 9b5f567..d899585 100644
--- a/src/jcgp/gui/population/GUIInput.java
+++ b/src/jcgp/gui/population/GUIInput.java
@@ -68,4 +68,9 @@ public class GUIInput extends GUIGene implements GUIConnection {
 	 */
 	@Override
 	protected void setLinesVisible(boolean value) {}
+
+	@Override
+	public void setLockRecursively(boolean value) {
+		setLock(value);
+	}
 }
diff --git a/src/jcgp/gui/population/GUINode.java b/src/jcgp/gui/population/GUINode.java
index 230d167..ee98f22 100644
--- a/src/jcgp/gui/population/GUINode.java
+++ b/src/jcgp/gui/population/GUINode.java
@@ -37,13 +37,13 @@ public class GUINode extends GUIGene implements GUIMutable, GUIConnection {
 		node.setGUIObject(this);
 
 		// create the output socket
-		Circle output = new Circle(Constants.NODE_RADIUS, 0, Constants.SOCKET_RADIUS, Constants.SOCKET_COLOUR);
+		Circle output = new Circle(Constants.NODE_RADIUS, 0, Constants.SOCKET_RADIUS, Constants.SOCKET_PAINT);
 		output.setStroke(Paint.valueOf("black"));
 		
 		// create input sockets
 		sockets = new Circle[GUI.resources.arity()];
 		for (int l = 0; l < sockets.length; l++) {
-			sockets[l] = new Circle(Constants.SOCKET_RADIUS, Constants.SOCKET_COLOUR);
+			sockets[l] = new Circle(Constants.SOCKET_RADIUS, Constants.SOCKET_PAINT);
 			sockets[l].setStroke(Paint.valueOf("black"));
 			sockets[l].setId(String.valueOf(l));
 			// relocate them
@@ -128,4 +128,12 @@ public class GUINode extends GUIGene implements GUIMutable, GUIConnection {
 			lines[i].setVisible(value);
 		}
 	}
+
+	@Override
+	public void setLockRecursively(boolean value) {
+		setLock(value);
+		for (int i = 0; i < GUI.resources.arity(); i++) {
+			((GUIConnection) ((Gene) node.getConnection(i)).getGUIObject()).setLockRecursively(value);
+		}
+	}
 }
diff --git a/src/jcgp/gui/population/GUIOutput.java b/src/jcgp/gui/population/GUIOutput.java
index b281833..9ffef1d 100644
--- a/src/jcgp/gui/population/GUIOutput.java
+++ b/src/jcgp/gui/population/GUIOutput.java
@@ -35,7 +35,7 @@ public class GUIOutput extends GUIGene implements GUIMutable {
 		output.setGUIObject(this);
 
 		// create input socket
-		Circle socket = new Circle(-Constants.NODE_RADIUS, 0, Constants.SOCKET_RADIUS, Constants.SOCKET_COLOUR);
+		Circle socket = new Circle(-Constants.NODE_RADIUS, 0, Constants.SOCKET_RADIUS, Constants.SOCKET_PAINT);
 		socket.setStroke(Paint.valueOf("black"));
 		socket.setId(String.valueOf(0));
 		Position.connect(line, (GUIGene) ((Gene) output.getSource()).getGUIObject());