Location of Icon in JLabel

Question

I am writing an application that responds to a mouse click in a JLabel. This Icon has to move as the window resizes (as default in GridLayout). Despite this I need to be able to translate clicking on the top corner of the ImageIcon to clicking on (0,0).
I know that this top corner will be red, so I could search the JLabel for the first pixel of that color. I'm not sure how to do that though.
If there is an easier way to figure out where the top corner of a particular icon in a label is, though, it would be greatly appreciated.
Thanks in advance,
Sarah

Answer 1

This is the function from BasicLabelUI that is used to position the icon.
iconR is the icon Rectangle.
    protected String layoutCL(
        JLabel label,                 
        FontMetrics fontMetrics,
        String text,
        Icon icon,
        Rectangle viewR,
        Rectangle iconR,
        Rectangle textR)
        return SwingUtilities.layoutCompoundLabel(
            (JComponent) label,
            fontMetrics,
            text,
            icon,
            label.getVerticalAlignment(),
            label.getHorizontalAlignment(),
            label.getVerticalTextPosition(),
            label.getHorizontalTextPosition(),
            viewR,
            iconR,
            textR,
            label.getIconTextGap());
    }This is the call to this method:
        JLabel label = (JLabel)c;
        String text = label.getText();
        Icon icon = (label.isEnabled()) ? label.getIcon() : label.getDisabledIcon();
        if ((icon == null) && (text == null)) {
            return;
        FontMetrics fm = SwingUtilities2.getFontMetrics(label, g);
        Insets insets = c.getInsets(paintViewInsets);
        paintViewR.x = insets.left;
        paintViewR.y = insets.top;
        paintViewR.width = c.getWidth() - (insets.left + insets.right);
        paintViewR.height = c.getHeight() - (insets.top + insets.bottom);
        paintIconR.x = paintIconR.y = paintIconR.width = paintIconR.height = 0;
        paintTextR.x = paintTextR.y = paintTextR.width = paintTextR.height = 0;
        String clippedText =
            layoutCL(label, fm, text, icon, paintViewR, paintIconR, paintTextR);