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JPanel paintComponent method

Posted on 2008-10-26
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Last Modified: 2013-12-14
I am creating a frame that draws a picture (which is a JPanel) 4 times using a gridLayout(2,2). For some reason, the background rectangle which should be white, is only drawing itself in the top left hand corner and not in the others. Any suggestions?
public class CanadaFlag extends JPanel {
 
    public CanadaFlag() {
    }
    
    public void paintComponent(Graphics g) {
    	
    	Graphics2D g2 = (Graphics2D)g;  
    	Rectangle flag = new Rectangle();
    	flag.setBounds(this.getBounds());
    	
    	int h = (int)flag.getHeight();
   	int w = (int)flag.getWidth();
    	int xCoord = (int)flag.getX();
    	int yCoord = (int)flag.getY();
    	
 
    	g2.setColor(Color.WHITE);
    	g2.fillRect(xCoord,yCoord,w,h); //this only draws it in the 
//topleft.
 
//here is where i call the panel:
 
public class FlagsFrame extends JFrame {
 
    public FlagsFrame() {
    	Toolkit toolkit = Toolkit.getDefaultToolkit();
    	Dimension dimensions = toolkit.getScreenSize();
    	int height = dimensions.height;
    	setBounds(0,0,height,height);
    	setLayout(new GridLayout(2,2));
    	add(new CanadaFlag());
    	add(new CanadaFlag());
    	add(new CanadaFlag());	
    	add(new CanadaFlag());
    	setTitle("Designed by Eric Totte: Canadian-Olympic"); 	
    }    
}

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Question by:etotte1
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LVL 61

Accepted Solution

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Kevin Cross earned 1500 total points
ID: 22809465
Think the x and y coordinates are coming back the same for each of the four flags; therefore, I would pass the x and y coordinates in the constructor of flag something like this:

(these may not be the right location points, but using as an example)
add(new CanadaFlag(0, 0)); // top left
          add(new CanadaFlag(0, 20)); // bottom left
          add(new CanadaFlag(20, 0)); // top right      
          add(new CanadaFlag(20, 20)); // bottom right

Hope that makes sense and helps.
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Author Comment

by:etotte1
ID: 22809488
When i use methods like fillPolygon() the polygon shows up 4 times so the x and y coordinates are updating themselves as the coordinates used for the polygon are relative to the panel
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LVL 61

Expert Comment

by:Kevin Cross
ID: 22809932
I don't see any panels above, so I am not sure what you are trying to convey with your last statement.  If you saying that the new CanadaFlag() doesn't need x, y coordinates since it takes it from panel, then you must ensure that have JPanels added at the correct x, y coordinates and then add CanadaFlag() to each of the four JPanels you create.
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