Scaling, Rotating Components

Question

Was just working on a personal project in which I needed to scale a component, and this lead me to finding some bugs in code I'd posted here to rotate components. So I just thought I'd post the new PERFECT (for now) superclass to both of these problems, which you can find [here in TUS|http://tus.svn.sourceforge.net/viewvc/tus/tjacobs/ui/mod/] Enjoy!
package tjacobs.ui.mod;
import java.awt.Component;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.geom.AffineTransform;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLayeredPane;
import javax.swing.SwingUtilities;
public abstract class ModPanel extends JLayeredPane {
     private static final long serialVersionUID = 1L;
     protected Component glass;
     private Component lastComponent;
     @SuppressWarnings("serial")
     public ModPanel() {
          final JComponent mouseCatcher = new JComponent() {
               public void setCursor(Cursor c) {
               public Cursor getCursor() {
                    if (lastComponent != null) return lastComponent.getCursor();
                    return super.getCursor();
          glass = mouseCatcher;
          this.add(mouseCatcher);
          mouseCatcher.setLocation(new Point(0,0));
          this.setLayer(mouseCatcher, JLayeredPane.POPUP_LAYER + 100);
          addComponentListener(new ComponentAdapter() {
               public void componentResized(ComponentEvent ev) {
                    mouseCatcher.setSize(getSize());
          MyMouseListener listener = new MyMouseListener();
          mouseCatcher.addMouseListener(listener);
          mouseCatcher.addMouseMotionListener(listener);
          mouseCatcher.setFocusable(false);
     abstract protected Point modifyPoint(MouseEvent me);
     public void paint(Graphics g) {
          Graphics2D g2 = modifyGraphics(g);
          super.paint((Graphics) g2);
     public Graphics getGraphics() {
          return modifyGraphics(super.getGraphics());
     protected abstract Graphics2D modifyGraphics(Graphics g);
     private class MyMouseListener implements MouseListener, MouseMotionListener {
          @Override
          public void mouseClicked(MouseEvent arg0) {
               handle(arg0);
               arg0.consume();
          @Override
          public void mouseEntered(MouseEvent arg0) {
               //arg0.consume();
          @Override
          public void mouseExited(MouseEvent arg0) {
               //arg0.consume();
          @Override
          public void mousePressed(MouseEvent arg0) {
               handle(arg0);
               arg0.consume();
          @Override
          public void mouseReleased(MouseEvent arg0) {
               handle(arg0);
               arg0.consume();
          private void handle(MouseEvent me) {
               Point loc = me.getPoint();
               loc = modifyPoint(me);
               remove(glass);
               Component c = null;
               if (me.getID() == MouseEvent.MOUSE_RELEASED && lastComponent != null) {
                    c = lastComponent;
               } else {
                    c = SwingUtilities.getDeepestComponentAt(ModPanel.this, loc.x, loc.y);
               add(glass);
               if (c != null) {
                    MouseEvent ev = createNewMouseEvent(me, me.getID(), c, loc);
                    c.dispatchEvent(ev);
          private void handleMove(MouseEvent me) {
               Point loc = me.getPoint();
               Point loc2 = modifyPoint(me);
               remove(glass);
               Component c = null;
               if (me.getID() == MouseEvent.MOUSE_DRAGGED) c = lastComponent;
               else {
                    c = SwingUtilities.getDeepestComponentAt(ModPanel.this, loc2.x, loc2.y);
               if (c instanceof ZoomPanel) c= null;
               add(glass);
               if (c == glass || c== ModPanel.this) c = null;
               if (lastComponent != c && me.getID() != MouseEvent.MOUSE_DRAGGED) {
                    if (lastComponent != null) {
                         MouseEvent me1 = createNewMouseEvent(me, MouseEvent.MOUSE_EXITED, lastComponent, loc);
                         lastComponent.dispatchEvent(me1);
                    lastComponent = c;
                    if (c != null) {
                         MouseEvent me1 = createNewMouseEvent(me, MouseEvent.MOUSE_ENTERED, c, loc2);
                         c.dispatchEvent(me1);
               if (c != null && c != ModPanel.this) {
                    MouseEvent me1 = createNewMouseEvent(me, me.getID(), c, loc2);
                    c.dispatchEvent(me1);
          private MouseEvent createNewMouseEvent(MouseEvent me, int type, Component newComp, Point newPoint) {
               Point pt = SwingUtilities.convertPoint(ModPanel.this, newPoint, newComp);
               MouseEvent me2 = new MouseEvent(newComp, type, me.getWhen(), me.getModifiers() | me.getModifiersEx(), pt.x, pt.y, me.getClickCount(), me.isPopupTrigger(), me.getButton());
               return me2;
          @Override
          public void mouseDragged(MouseEvent arg0) {
               handleMove(arg0);
                arg0.consume();
          @Override
          public void mouseMoved(MouseEvent arg0) {
               handleMove(arg0);
               arg0.consume();
}Edited by: tjacobs01 on Jan 16, 2010 6:40 PM

Answer 1

Thanks for the great code. It is not perfect yet though, but that is easy to fix. You pass the modified mouse coordinates to 'getDeepestComponentAt'. This does not work. I am scaling down a slider to 50% and it only received events for the top-left rectangle. If you pass in the original coordinates, the mouse events will get through to the underlying component.
Regards,
Johan
Edited by: jstuyts on Feb 11, 2010 3:42 PM. Removed code block so the method name is inline in the text.