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  Creating a spotlight  (Read 1789 times)
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Offline SlashOwnsU

Innocent Bystander

Java games rock!

« Posted 2004-11-07 15:36:40 »

hello people!

I'm making a game resembling parappa the rapper (for those of you who remember)
so I got a dude rapping on a stage
what I wanna do is create multiple spotlights that light up the stage
the spotlights start from the top, spread their light down (in a triangle) and light up the floor with an oval
what I do is that I draw a triangle polygon that represents the light...this triangle is semi-transparent and has the "lighting the scene up" effect
I also draw a trasparent oval on the floor
code looks like

g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, intensity));
           Polygon p = new Polygon();
     //fromX and fromY are the starting point of the light
           p.addPoint(fromX, fromY);
 //atX and atY the center of the oval of light on the floor...radX and radY the radius
           p.addPoint(atX - radX, atY);
           p.addPoint(atX + radX, atY);
           g2.fillOval(atX - radX, atY - radY, radX * 2, radY * 2);
                 //correction light
           g2.fillArc(atX - radX, atY - radY, radX * 2, radY * 2, 0, -180);
           g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 1.0f));

now the problem is that drawing the filled polygon every time is too slow (I'm using bufferStrategy, which is the fastest drawing technique I know so far)
it lowers my FPS by like 20 FPS

anyone has any alternatives to that method ?
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