Satish, I see that your code is NOT overriding the paintComponent, but the paint
method.
Make sure the paintComponent method looks like this:
protected void paintComponent(Graphics g) {
super.paintComponent(g);
..... // whatever you want to do
}
The call to super.paintComponent(g) is necessary to let the UI delegate to paint. This
would let it paint cleanly.
Hope this helps.
Ngan
Satish Annapureddy wrote:
> Hi,
>
> I am new to Java2D and am wondering if there are any
> issues with using Graphics2D with Swing components.
>
> In the example code attached below,
> I have a JPanel whose paintComponent() method is overridden
> to use Graphics2D to just draw a rectangle and a piece of text.
> When the window gets obscured and then exposed, I see some artifacts.
>
> However, if I use AWT Canvas instead of JPanel, the repainting works
> as expected.
>
> Also, I noticed that the Java2D demos override paint() method
> on DemoSurface
> which is a subclass of JPanel. Shouldn't they be overriding
> paintComponent()
> instead?
>
> I am using Blackdown's Linux port for Java version: 1.2 on Intel
> platform.
>
> Thanks,
> Satish.
>
> ------------------------------------------------------------------------
> import java.awt.*;
> import javax.swing.*;
> import java.awt.event.*;
> import java.awt.geom.*;
>
> public class Test2D extends JFrame {
> public Test2D() {
> JPanel panel = new DrawPanel();
> getContentPane().add(panel);
>
> // Canvas panel = new DrawPanel();
> // getContentPane().add(panel);
>
> pack();
> setVisible(true);
> }
> public static void main( String[] args ) {
> Test2D test = new Test2D();
> }
> }
>
> // class DrawPanel extends Canvas {
> // public void paint(Graphics g) {
> class DrawPanel extends JPanel {
> public void paint(Graphics g) {
> Graphics2D g2d = (Graphics2D)g;
> g2d.setBackground(Color.blue);
> g2d.setColor(Color.white);
> g2d.clearRect(0, 0, getWidth(), getHeight());
> g2d.setTransform(new AffineTransform());
> Rectangle2D rect = new Rectangle2D.Float(0, 0, getWidth()/2, getHeight()/2);
> g2d.fill(rect);
> g2d.drawString("Test2D", getWidth()/2, getHeight()/2);
> }
> public Dimension getPreferredSize() {
> return new Dimension(100, 100);
> }
> }
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