My repaint() doesnt work

Hope somebody can help. I had posted this qtn on another site and got a response pointing to a java sun site talking about paint in general. unfortunately did not help.
the issue is as follows:
Heres the problem
Have this drawing application with menus and stuff. so i draw box/lines/ circle etc. and when the mouse is released, i add the positions etc to an array, in my paint program, i parse thru the array and show the stuff. Now whatever i draw, doesnt appear immediately (although i have a repaint() (also tried validate, revalidate and every command i have learnt/come across).
funny thing is, if i press my alt key, the "file" menu option will appear to be selected, when i press escape, the drawing window gets focus and immediately all my drawings appear. So my question, how do i make it do that.
Additionally (while i am on the roll here) in my menu option i have a File/New when this is selected, i clear the array and do a repaint(). that works beautifully and all the drawing are gone. but if i click on a icon (designated as "new") that wont do anything until i go thru that pressing alt (or switching to another application using alt+tab and then coming back to my paint program).
Any ideas?
To add further this is how my code looks
there is a frame called drawingWindow (my highest level).
got a container Container drawBoard = getContentPane(); which is added to my frame.
i got menubar and toolbar created and added to the drawingWindow
Then i got this class which contains the paintcomponent routine.
JPanel drawingArea = new DrawGraphics();
and this is added to the container.
drawBoard.add(drawingArea,BorderLayout.CENTER);
as i mentioned earlier: when i draw something, the repaint doesnt show the stuff immediately. instead i have to switch to some other applications that overlaps this java program and when i switch back i will see my paint.
why so and how can i ever get it to work.
Thank you in advance.

The same kind of problem I was also having some time back but what i did was sounding funny to me, but i did it.... as there is no way.Just do resize kind of operation.
After calling repaint method , just get the current size of window, set it to next size and again set it back to original size.Screen will flicker for a fraction of second.It was working very well to me.Maybe it will help you too.......

Similar Messages

Traffic light repaint not working via button

I created a traffic light, a button is pressed and the colors should cycle yellow>green>yellow>red etc.. as a normal traffic light would
when i press the start button, the repaint(); doesnt work, system.output shows me the number which corresponds to the light changes but somehow the graphics/paint is not updated.
what am i doing wrong?
package test2; 
 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import javax.swing.JButton; 
import javax.swing.JOptionPane; 
import javax.swing.JPanel; 
 
public class Traffic_Lights extends JPanel implements ActionListener { 
 
private Light_Controller LightController; 
private JButton jStart, jStop; 
 
public Traffic_Lights() { 
jStart = new JButton("START"); 
jStop = new JButton("EXIT"); 
 
// Register Listeners with buttons 
jStart.addActionListener(this); 
jStop.addActionListener(this); 
LightController = new Light_Controller(); 
this.add(jStart); 
this.add(jStop); 
} 
// Adding the traffic light 
 
 
/** 
* This method traps the button click events 
*/ 
public void actionPerformed(ActionEvent e) { 
// Rotate button is clicked 
if (e.getSource() == jStart) { 
// Change the color displayed 
LightController.changeColor(); 
package test2; 
import java.awt.*; 
import java.awt.geom.Rectangle2D; 
import javax.swing.JComponent; 
import javax.swing.JPanel; 
 
 
public class Light_Controller extends JPanel { 
 
private int lightState = 1; 
 
 
public void changeColor() { 
lightState++; 
System.out.println(lightState); 
if (lightState > 5) { 
lightState = 2; 
 
} 
 
this.repaint(); 
 
} 
 
/** 
* This method draws the traffic light on the screen 
*/ 
public void paintComponent(Graphics g) { 
super.paintComponent(g); 
 
Graphics2D g1 = (Graphics2D) g; 
// Draws the traffic light 
// Draw out white frame 
g.setColor(new Color(255,255,255)); 
g.fillRoundRect(35,15,120,225,30,30); 
 
// Draw inner black frame 
g.setColor(new Color(0,0,0)); 
g.fillRoundRect(50,30,90,195,30,30); 
g.drawRoundRect(35,15,120,225,30,30); 
 
// RED dim 
g.setColor(new Color(100,0,0)); 
g.fillOval(70,40,50,50); 
 
// YELLOW dim 
g.setColor(new Color(100,100,0)); 
g.fillOval(70,100,50,50); 
 
// GREEN dim 
g.setColor(new Color(0,100,0)); 
g.fillOval(70,160,50,50); 
 
// Draw traffic light stand 
g.setColor(new Color(50,50,50)); 
g.fillRect(80,240,30,30); 
 
switch(lightState) { 
case 1: 
// red glows 
g.setColor(new Color(255, 0, 0)); 
g.fillOval(70, 40, 50, 50); 
g1.fill(new Rectangle2D.Double(440, 450, 60, 5)); 
g1.fill(new Rectangle2D.Double(350, 240, 60, 5)); 
g1.fill(new Rectangle2D.Double(345, 360, 5, 80)); 
g1.fill(new Rectangle2D.Double(500, 250, 5, 90)); 
break; 
 
case 2: 
// yellow glows 
g.setColor(new Color(255, 255, 0)); 
g.fillOval(70, 100, 50, 50); 
g1.fill(new Rectangle2D.Double(440, 450, 60, 5)); 
g1.fill(new Rectangle2D.Double(350, 240, 60, 5)); 
g1.fill(new Rectangle2D.Double(345, 360, 5, 80)); 
g1.fill(new Rectangle2D.Double(500, 250, 5, 90)); 
break; 
 
case 3: 
// green glows 
g.setColor(new Color(0, 255, 0)); 
g.fillOval(70, 160, 50, 50); 
g1.fill(new Rectangle2D.Double(440, 450, 60, 5)); 
g1.fill(new Rectangle2D.Double(350, 240, 60, 5)); 
g1.fill(new Rectangle2D.Double(345, 360, 5, 80)); 
g1.fill(new Rectangle2D.Double(500, 250, 5, 90)); 
break; 
 
case 4: 
// back to yellow glows 
g.setColor(new Color(255, 255, 0)); 
g.fillOval(70, 100, 50, 50); 
g1.fill(new Rectangle2D.Double(440, 450, 60, 5)); 
g1.fill(new Rectangle2D.Double(350, 240, 60, 5)); 
g1.fill(new Rectangle2D.Double(345, 360, 5, 80)); 
g1.fill(new Rectangle2D.Double(500, 250, 5, 90)); 
break; 
 
case 5: 
// back to red glows 
g.setColor(new Color(255, 0, 0)); 
g.fillOval(70, 40, 50, 50); 
g1.fill(new Rectangle2D.Double(440, 450, 60, 5)); 
g1.fill(new Rectangle2D.Double(350, 240, 60, 5)); 
g1.fill(new Rectangle2D.Double(345, 360, 5, 80)); 
g1.fill(new Rectangle2D.Double(500, 250, 5, 90)); 
break; 
} 
} 
} 

Code continued...
class Light_Controller extends JPanel {
 private int lightState = 1;
 public void changeColor() {
 lightState++;
 System.out.println(lightState);
 if (lightState > 5) {
 lightState = 2;
 this.repaint();
 public void paintComponent(Graphics g) {
 super.paintComponent(g);
 Graphics2D g1 = (Graphics2D) g;
 g.setColor(new Color(255, 255, 255));
 g.fillRoundRect(35, 15, 120, 225, 30, 30);
 g.setColor(new Color(0, 0, 0));
 g.fillRoundRect(50, 30, 90, 195, 30, 30);
 g.drawRoundRect(35, 15, 120, 225, 30, 30);
 g.setColor(new Color(100, 0, 0));
 g.fillOval(70, 40, 50, 50);
 g.setColor(new Color(100, 100, 0));
 g.fillOval(70, 100, 50, 50);
 g.setColor(new Color(0, 100, 0));
 g.fillOval(70, 160, 50, 50);
 g.setColor(new Color(50, 50, 50));
 g.fillRect(80, 240, 30, 30);
 switch (lightState) {
 case 1:
 g.setColor(new Color(255, 0, 0));
 g.fillOval(70, 40, 50, 50);
 g1.fill(new Rectangle2D.Double(440, 450, 60, 5));
 g1.fill(new Rectangle2D.Double(350, 240, 60, 5));
 g1.fill(new Rectangle2D.Double(345, 360, 5, 80));
 g1.fill(new Rectangle2D.Double(500, 250, 5, 90));
 break;
 case 2:
 g.setColor(new Color(255, 255, 0));
 g.fillOval(70, 100, 50, 50);
 g1.fill(new Rectangle2D.Double(440, 450, 60, 5));
 g1.fill(new Rectangle2D.Double(350, 240, 60, 5));
 g1.fill(new Rectangle2D.Double(345, 360, 5, 80));
 g1.fill(new Rectangle2D.Double(500, 250, 5, 90));
 break;
 case 3:
 g.setColor(new Color(0, 255, 0));
 g.fillOval(70, 160, 50, 50);
 g1.fill(new Rectangle2D.Double(440, 450, 60, 5));
 g1.fill(new Rectangle2D.Double(350, 240, 60, 5));
 g1.fill(new Rectangle2D.Double(345, 360, 5, 80));
 g1.fill(new Rectangle2D.Double(500, 250, 5, 90));
 break;
 case 4:
 g.setColor(new Color(255, 255, 0));
 g.fillOval(70, 100, 50, 50);
 g1.fill(new Rectangle2D.Double(440, 450, 60, 5));
 g1.fill(new Rectangle2D.Double(350, 240, 60, 5));
 g1.fill(new Rectangle2D.Double(345, 360, 5, 80));
 g1.fill(new Rectangle2D.Double(500, 250, 5, 90));
 break;
 case 5:
 g.setColor(new Color(255, 0, 0));
 g.fillOval(70, 40, 50, 50);
 g1.fill(new Rectangle2D.Double(440, 450, 60, 5));
 g1.fill(new Rectangle2D.Double(350, 240, 60, 5));
 g1.fill(new Rectangle2D.Double(345, 360, 5, 80));
 g1.fill(new Rectangle2D.Double(500, 250, 5, 90));
 break;
}

Repaint() doesnt call paint component

Hi all
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trigger's in mouse pressed, calls pageflip method, then in a pageflip method calls paintComponent
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MOTHERBOARD - MSI 645E MAX (MS-6547 Ver 2.0)
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