Clip a BufferedImage to an Area

Question

I'm trying to draw an image within a certain area. Right now I have code that fills an area with a RadialGradientPaint.

Area lightArea = ...
// fill the polygon with the gradient paint
g.setPaint(light.paint);
g.fill(lightArea);

I would like to draw a BufferedImage in that area instead of drawing a RadialGradientPaint. Is there a way I can do that?

score 2 · Answer 1 · edited May 23 '17 at 12:28

You could use BufferdImage#getSubimage

Rectangle bounds = area.getBounds();
BufferedImage img = master.getSubImage(0, 0, Math.min(bounds.width, master.getWidth()), Math.min(bounds.height, master.getHeight());

This assumes that the area is rectangular. If it's not, you cold create a mask image, based on the shape of the Area and use it to generate masked image (cookie cutting the image out of the shape)

As demonstrated here. The benefit of which is it allows for antialiasing

score 1 · Accepted Answer · answered Mar 04 '15 at 19:00

1

Use Graphics.setClip:

g.setClip(lightArea);
g.drawImage(yourImage, x, y, null);

See http://docs.oracle.com/javase/tutorial/2d/advanced/clipping.html for more details.

answered Mar 04 '15 at 19:00

Adrian Leonhard

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And don't forget to 1- reset the clip and 2- check to see if the new clip is still in the bounds of the old one... – MadProgrammer Mar 04 '15 at 20:36

Clip a BufferedImage to an Area

2 Answers2