Do not allow creating zero-length components

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

@@ -503,6 +503,10 @@ public class Presenter implements IPlugInPort {
               // On the second click, add the component to the
               // project.
               List<IDIYComponent<?>> componentSlot = instantiationManager.getComponentSlot();
+              Point firstPoint = componentSlot.get(0).getControlPoint(0);
+              // don't allow to create component with the same points
+              if (scaledPoint.equals(firstPoint))
+                return;
               componentSlot.get(0).setControlPoint(scaledPoint, 1);
               List<IDIYComponent<?>> newSelection = new ArrayList<IDIYComponent<?>>();
               for (IDIYComponent<?> component : componentSlot) {

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

@@ -18,7 +18,6 @@ import org.diylc.common.IPlugInPort;
 import org.diylc.common.ObjectCache;
 import org.diylc.common.Orientation;
 import org.diylc.components.AbstractTransparentComponent;
-import org.diylc.components.misc.Label;
 import org.diylc.components.transform.DIL_ICTransformer;
 import org.diylc.core.ComponentState;
 import org.diylc.core.IDIYComponent;

diylc/diylc-swing/update.xml

@@ -1654,6 +1654,10 @@
 					<changeType>NEW_FEATURE</changeType>
 					<description>Ability to set project-wide default font through 'Edit Project Settings' dialog.</description>
 				</org.diylc.appframework.update.Change>	
+				<org.diylc.appframework.update.Change>
+					<changeType>IMPROVEMENT</changeType>
+					<description>Do not allow creating zero-length components (i.e. traces, lines, etc)</description>
+				</org.diylc.appframework.update.Change>	
 				<org.diylc.appframework.update.Change>
 					<changeType>IMPROVEMENT</changeType>
 					<description>Hookup wire can be sent to back behind boards</description>