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  Rotating A Point  (Read 2128 times)
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Offline DDDBOMBER

Junior Devvie


Projects: 1



« Posted 2013-03-01 22:22:41 »

I am rotating a sprite in game around the center, and need to find out where a certain point is, from the original, so for example in the original a point at (1, 1) on the 64 x 128 image. I need to find that point after the rotation. I am using slick2d as my graphics library
Offline cubemaster21
« Reply #1 - Posted 2013-03-01 22:26:16 »

This is what I use to rotate points, only I use Vector2D, but it works the same way.
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   public static Vector2D rotate(Vector2D origin,Vector2D point, double theta){
      double s = Math.sin(theta);
      double c = Math.cos(theta);
      // get the deltaX and deltaY
      point.x -= origin.x;  
       point.y -= origin.y;  

       // rotate point  
         double xnew = point.x * c - point.y * s;  
       double ynew = point.x * s + point.y * c;

       // translate point back to global coords:
       Vector2D TranslatedPoint = new Vector2D(0,0);
       TranslatedPoint.x = xnew + origin.x;  
       TranslatedPoint.y = ynew + origin.y;

       return TranslatedPoint;
       
   }

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Offline DDDBOMBER

Junior Devvie


Projects: 1



« Reply #2 - Posted 2013-03-01 22:43:24 »

Oh cool thanks, i found a way like this of wikipedia's rotation page, but thanks for the help anyways
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