Hi I'm making a flash light for a game. I make the flashlight using Arc2D and basically clip part of the map so that only that part shows up, but I also want part of the map to so up too.
Is there anyway to reverse my clipped region and get the region not being clipped?
How do I get the black region?
You can use the Area#subtract method to obtain the desired area:
Rectangle2D screen =
new Rectangle2D.Double(0,0,screenWidth, screenHeight);
Area result = new Area(screen);
Area clippingArea = new Area(yourArcClipShape);
result.subtract(clippingArea);
The result will then be the shape of the full screen, except for your original "arc" clipping shape - that is, the black area in the image.
Related answers, showing some light effects and image compositing:
