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  [LibGDX]Pixel perfect collision with flipped images  (Read 353 times)
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Offline P0jahn

Senior Devvie


Medals: 1
Projects: 3



« Posted 2014-08-20 16:33:27 »

I have a pixel perfect method that works fine except when one or more of the images are flipped(or rotated, but I wont fix that).

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   public static boolean pixelPerfect(GameObject obj1, GameObject obj2)
   {  
      Image2D image1 = obj1.getImage();
      Image2D image2 = obj2.getImage();
     
      int top      = (int) Math.max(obj1.currY, obj2.currY);
      int bottom   = (int) Math.min(obj1.currY + obj1.height, obj2.currY + obj2.height);
      int left     = (int) Math.max(obj1.currX, obj2.currX);
      int right    = (int) Math.min(obj1.currX + obj1.width, obj2.currX + obj2.width);
     
      boolean flipped1 = image1.isFlipX();
      boolean flipped2 = image2.isFlipX();

      for (int y = top; y < bottom; y++)
      {
         for (int x = left; x < right; x++)
         {
            int colorA;
            int colorB;
           
            if(flipped1)
               colorA = //TODO
            else
               colorA = image1.getColor((int) (x - obj1.currX), (int) (y - obj1.currY));
            if(flipped2)
               colorB = //TODO
            else
               colorB = image2.getColor((int) (x - obj2.currX), (int) (y - obj2.currY));
           
            if (colorA != 0 && colorB != 0)
               return true;
         }
      }
      return false;
   }


How do I calculate the current pixel to check if the image is flipped horizontally?
Offline lcass
« Reply #1 - Posted 2014-08-20 17:20:25 »

So the issue is coming up when you flip the object? I think it may be coming from when you calculate the corners of your object . You add the object width , when flipped it could just shift the shape over.
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