MouseEvent in Line-DragKing

Question

hai,
In the following code if Frame is replaced by JFrame
it is not painted properly.
Leave the exceptions.
I want to implement the same using JFrame
Thanks in advance
anu
---------Start--DragKing.java---------
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
public class DragKing
extends Frame //javax.swing.JFrame
implements MouseListener, MouseMotionListener {
protected Point2D[] mPoints;
protected Point2D mSelectedPoint;
public DragKing() {
super("DragKing v1.0");
createUI();
wireEvents();
protected void createUI() {
setSize(300, 300);
setLocation(100, 100);
setVisible(true);
mPoints = new Point2D[9];
// Cubic curve.
mPoints[0] = new Point2D.Double(50, 75);
mPoints[1] = new Point2D.Double(100, 100);
mPoints[2] = new Point2D.Double(200, 50);
mPoints[3] = new Point2D.Double(250, 75);
// Quad curve.
mPoints[4] = new Point2D.Double(50, 175);
mPoints[5] = new Point2D.Double(150, 150);
mPoints[6] = new Point2D.Double(250, 175);
// Line
mPoints[7] = new Point2D.Double(50, 275);
mPoints[8] = new Point2D.Double(250, 275);
mSelectedPoint = null;
protected void wireEvents() {
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
dispose();
System.exit(0);
addMouseListener(this);
addMouseMotionListener(this);
public void paint(Graphics g) { paint((Graphics2D)g); }
public void paint(Graphics2D g) {
g.setPaint(Color.black);
// Draw the cubic curve.
CubicCurve2D c = new CubicCurve2D.Float();
c.setCurve(
mPoints[0].getX(), mPoints[0].getY(),
mPoints[1].getX(), mPoints[1].getY(),
mPoints[2].getX(), mPoints[2].getY(),
mPoints[3].getX(), mPoints[3].getY());
g.draw(c);
// Draw the quadratic curve.
QuadCurve2D q = new QuadCurve2D.Float();
q.setCurve(
mPoints[4].getX(), mPoints[4].getY(),
mPoints[5].getX(), mPoints[5].getY(),
mPoints[6].getX(), mPoints[6].getY());
g.draw(q);
// Draw the line.
Line2D l = new Line2D.Float();
l.setLine(
mPoints[7].getX(), mPoints[7].getY(),
mPoints[8].getX(), mPoints[8].getY());
g.draw(l);
for (int i = 0; i < mPoints.length; i++) {
// If the point is selected, use the selected color.
if (mPoints[i] == mSelectedPoint)
g.setPaint(Color.red);
else
g.setPaint(Color.blue);
// Draw the point.
g.fill(getControlPoint(mPoints));
protected Shape getControlPoint(Point2D p) {
// Create a small square around the given point.
int side = 4;
return new Rectangle2D.Double(
p.getX() - side / 2, p.getY() - side / 2,
side, side);
public void mouseClicked(MouseEvent me) {}
public void mousePressed(MouseEvent me) {
mSelectedPoint = null;
for (int i = 0; i < mPoints.length; i++) {
Shape s = getControlPoint(mPoints[i]);
if (s.contains(me.getPoint())) {
mSelectedPoint = mPoints[i];
break;
repaint();
public void mouseReleased(MouseEvent me) {}
public void mouseMoved(MouseEvent me) {}
public void mouseDragged(MouseEvent me) {
if (mSelectedPoint != null) {
mSelectedPoint.setLocation(me.getPoint());
repaint();
public void mouseEntered(MouseEvent me) {}
public void mouseExited(MouseEvent me) {}
public static void main(String[] args) {
new DragKing();
---------End--DragKing.java---------

Answer 1

hai,
I got it.
the pbm is I've not called super.paint() in my paint md.
anu