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 Rotating A Point  (Read 1804 times) 0 Members and 1 Guest are viewing this topic.
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
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.
 1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19 `   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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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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