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add Matrices utility to set MVP matrix to use screen pixel coordinates

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Hannes Janetzek 2013-05-01 03:25:56 +02:00
parent 12f064c460
commit a1bd0c9eaa
1 changed files with 21 additions and 0 deletions
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21
src/org/oscim/renderer/GLRenderer.java
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@ -84,6 +84,27 @@ public class GLRenderer implements GLSurfaceView.Renderer {
// for temporary use by callee
public final Matrix4 mvp = new Matrix4();
/**
* Set MVP so that coordinates are in screen pixel coordinates
* with 0,0 being center
*/
public void useScreenCoordinates(boolean center, float scale) {
float ratio = (1f / (scale * screenWidth));
if (center)
mvp.setScale(ratio, ratio, ratio);
else
mvp.setTransScale(
(-screenWidth / 2) * ratio * scale,
(-screenHeight / 2) * ratio * scale,
ratio);
//
// mvp.setTransScale(-screenWidth / ratio,
// screenHeight / ratio, ratio);
mvp.multiplyMM(proj, mvp);
}
}
private static Matrices mMatrices;