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  Simple Clipping  (Read 2645 times)
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Offline Shagroth

Senior Newbie

EQ Freak

« Posted 2005-12-26 09:17:31 »

Hello all,

  I implemented my own simple windowing system for my game.  Since I only want to render the window when something has changed, I need to ensure that when my underlying tile system does not draw over my window.  I was thinking of doing it this way:  Start with a clipping region that is the same dimensions as the JFrame that holds the game, and have each of my game windows "cookie-cut" out where they are drawn.  This solution seems simple enough, yet when looking at the Graphics and Shape API it seems that I cannot create an arbitrary shape without explicitly specifying the points (like with a polygon).

In other words, I can't figure out how to do this robustly.  I know there are some other simple design patterns out there, so if someone could tell me how to implement the solution I explained or point me in the right direction it would be much appreciated!

-Mike Smiley

Offline rolz

Junior Devvie

Chief Technopolitan

« Reply #1 - Posted 2005-12-26 11:54:04 »

Actually, you can create an arbitrary shape with java.awt.geom.Area

        Area shape = new Area();
        shape.add(new Area(new Rectangle2D.Double(-50, -50, 100, 100)));        
        shape.add(new Area(new Rectangle2D.Double(-70, -10, 20, 20)));
        //adjust shape here

Offline Jeff

JGO Coder

Got any cats?

« Reply #2 - Posted 2005-12-26 20:06:22 »

But if this is a tile absed system you might well get better performance by limiting the tiles you draw to the ones being updated.

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Offline Shagroth

Senior Newbie

EQ Freak

« Reply #3 - Posted 2005-12-26 22:46:49 »

Thanks Jeff and Rolz!  I got it working.

-Mike Smiley

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