I think the problem is that you, ever so little, are trying to paint outside
the clipping area. Depending on the stroke width, lines are drawn on both sides
of the specified line. If you alter your render method as follows:
[code]
public void render(final Graphics2D g2d) {
g2d.setColor(Color.RED);
final Rectangle r = new Rectangle(0, 0, 80, 80);
Rectangle clip = new Rectangle(-1, -1, 82, 82);
g2d.setClip(clip);
g2d.draw(r);
}
[/code]
you will see that the lines are always drawn correctly. In your version, only
half of the width of the line can be drawn. When scaling very small and due to
rounding problems, the drawing may disappear entirely.
Piet
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