Odd behaviour in Graphics2D.drawImage - infinite loop?

Question

Hi,
I have the following code inside an overriden paintComponent (JPanel):
g2.drawImage(fc.getImage(),(int)fc.getSignificantPoint().getX(),
                                (int)fc.getSignificantPoint().getY(), vioPanel);fc is just an object that is a wrapper for an image and vioPanel is the JPanel class that has been overriden (it's not this because the drawing on g2 is done outside the jpanel class)
I'm getting some really strange behaviour that i can't explain: when the images are drawn i noticed they were flashing. so i put a system.out.println into the paintComponent method and it seems that calling the g2.drawImage method is causing the panel to be repainted constantly as if it is stuck in an infinite loop. Has anyone else experienced this? if so, do you know the solution?
If it helps, if you replace the vioPanel variable with new JPanel() the looping stops.
Cheers,
jj

Answer 1

hi,
VioPanel is a simple class that overrides JPanel with some extra functionality. Essentially tho, it overrides the paintComponent method as shown below and calls a method of a different object that draws the shapes and images. I tried putting all the code in that method into paintComponent (i.e. classic overriding of paintComponent), but still get the same problem.
public void paintComponent(Graphics g)
        super.paintComponent(g);
        dm.fireGraphics2DSequence();
    }The fireGraphics2DSequence method does all the drawing:
public void fireGraphics2DSequence()
        Graphics2D g2 = getPanelGraphics();
        g2.scale(magniFactor, magniFactor);
        //separate entities out
        ArrayList features = getFeatures();
        ArrayList lines = getLines();
        //draw map entities (lines and hubs first)
        for(int i = 0; i < lines.size(); i++)
            //draws shapes, which works fine
        //draw nodes
        g2.setColor(Color.black);
        for(int i = 0; i < features.size(); i++)
            FeatureCircle fc = (FeatureCircle)features.get(i);
            if (fc.isTagged()) continue;
            g2.drawImage(fc.getImage(),(int)fc.getSignificantPoint().getX(),
                                (int)fc.getSignificantPoint().getY(), vioPanel);
            //System.out.println("drawing "+i);
            if(entLabels) g2.drawString(fc.getName(),(float)fc.getSignificantPoint().getX(),
                                       (float)fc.getSignificantPoint().getY());
    }