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  Rectangle rendering issues  (Read 958 times)
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Offline novasharp

Junior Member


Medals: 1
Projects: 1


Gamemaker


« Posted 2012-11-26 21:56:10 »

I am rendering rectangles using this code:

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for(int r = 0; r < map.height; r++) {
   for(int c = 0; c < map.width; c++) {
      if(!map.getTile(c, r).passable) {
         gr.fillRect(
            (int)(c * GameComponent.tileSize),
            (int)(r * GameComponent.tileSize),
            GameComponent.tileSize,
            GameComponent.tileSize
         );
      } else {
         gr.drawRect(
            (int)(c * GameComponent.tileSize),
            (int)(r * GameComponent.tileSize),
            GameComponent.tileSize,
            GameComponent.tileSize
         );
      }
   }
}


For some reason, the edges of the outer filled rectangles render slightly off.



I cannot figure out why?

Thanks,
novasharp

novasharp
Offline RobinB

JGO Ninja


Medals: 44
Projects: 1
Exp: 3 years


Spacegame in progress


« Reply #1 - Posted 2012-11-26 22:46:26 »

If i remember it correct, drawrect draws the lines at the center of the borders, so if your lines are 2 pixels, they are always 1 pixel bigger.
Try this:

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         gr.drawRect(
            (int)(c * GameComponent.tileSize + 1),
            (int)(r * GameComponent.tileSize + 1),
            GameComponent.tileSize - 1,
            GameComponent.tileSize - 1
         );


Where 1 is your line width /2
Offline novasharp

Junior Member


Medals: 1
Projects: 1


Gamemaker


« Reply #2 - Posted 2012-11-27 00:42:58 »

Thanks, that fixed it.

novasharp
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