no repaint while resizing when using .setPaint(gradient)

Question

As soon a I use gradients in my code, the repaint isn\'t done while resizing I get something like that while resizing (black rectangles where it has been resized, see image in t

Answer 1

I put together a test and found that the GradientPaint has woeful performance. Taking an average render time from 1.2 seconds (at 400x400 pixles) out to 20+ seconds.

I changed the GradientPaint for a LinearGradientPaint and found that the render time was around 1.3 seconds instead.

LinearGradientPaint lgp = new LinearGradientPaint(
                new Point2D.Float(0, minY),
                new Point2D.Float(0, maxY),
                new float[] {0f, 0.5f, 1f},
                new Color[] {Color.BLUE, Color.RED, Color.BLUE}
                );
g2d.setPaint(lgp);
    // Render all your samples, don't reapply or change you paint...

Sorry, my sample isn't very exciting...

You may find it better to render to a backing buffer in a background thread instead and paint the whole image to the screen once it's complete. This will stop the screen from becoming "paused"