use clip to improve performance

diy-layout-creator --username bancika@gmail.com/DIYLC/src/org/diylc/components/AbstractComponent.java

@@ -2,6 +2,7 @@ package org.diylc.components;
 
 import java.awt.Color;
 import java.awt.Font;
+import java.awt.Shape;
 
 import org.diylc.core.IDIYComponent;
 import org.diylc.core.annotations.EditableProperty;
@@ -19,7 +20,7 @@ public abstract class AbstractComponent<T> implements IDIYComponent<T> {
 	private static final long serialVersionUID = 1L;
 
 	protected String name = "";
-	
+
 	public static Color SELECTION_COLOR = Color.red;
 	public static Color LABEL_COLOR = Color.black;
 	public static Color LABEL_COLOR_SELECTED = Color.red;
@@ -35,7 +36,7 @@ public abstract class AbstractComponent<T> implements IDIYComponent<T> {
 	public void setName(String name) {
 		this.name = name;
 	}
-	
+
 	@Override
 	public boolean canControlPointOverlap(int index) {
 		return false;
@@ -56,4 +57,17 @@ public abstract class AbstractComponent<T> implements IDIYComponent<T> {
 	protected int getClosestOdd(double x) {
 		return ((int) x / 2) * 2 + 1;
 	}
+
+	/**
+	 * @param clip
+	 * @return true if none of the control points lie in the clip rectangle.
+	 */
+	protected boolean checkPointsClipped(Shape clip) {
+		for (int i = 0; i < getControlPointCount(); i++) {
+			if (clip.contains(getControlPoint(i))) {
+				return false;
+			}
+		}
+		return true;
+	}
 }

diy-layout-creator --username bancika@gmail.com/DIYLC/src/org/diylc/components/AbstractCurvedComponent.java

@@ -63,6 +63,9 @@ public abstract class AbstractCurvedComponent<T> extends AbstractTransparentComp
 	@Override
 	public void draw(Graphics2D g2d, ComponentState componentState, Project project,
 			IDrawingObserver drawingObserver) {
+		if (checkPointsClipped(g2d.getClip())) {
+			return;
+		}
 		if (componentState == ComponentState.SELECTED || componentState == ComponentState.DRAGGING) {
 			// Do not track guidelines.
 			drawingObserver.stopTracking();

diy-layout-creator --username bancika@gmail.com/DIYLC/src/org/diylc/components/AbstractLeadedComponent.java

@@ -65,6 +65,9 @@ public abstract class AbstractLeadedComponent<T> extends AbstractTransparentComp
 		Shape shape = getBodyShape();
 		// If there's no body, just draw the line connecting the ending points.
 		if (shape == null) {
+			if (checkPointsClipped(g2d.getClip())) {
+				return;
+			}
 			g2d.setStroke(ObjectCache.getInstance().fetchBasicStroke(getLeadThickness()));
 			g2d.setColor(shouldShadeLeads() ? getLeadColor(componentState).darker()
 					: getLeadColor(componentState));