public class Rotate3d extends Animation{

private final float mFromDegrees;

private final float mToDegrees;

private final float mCenterX;

private final float mCenterY;

private final float mDepthZ;

private final boolean mReverse;

private Camera mCamera;

public Rotate3d(float fromDegrees, float toDegrees, float centerX, float centerY, float depthZ, boolean reverse) {

mFromDegrees = fromDegrees;

mToDegrees = toDegrees;

mCenterX = centerX;

mCenterY = centerY;

mDepthZ = depthZ;

mReverse = reverse;

}

@Override

public void initialize(int width, int height, int parentWidth, int parentHeight) {

super.initialize(width, height, parentWidth, parentHeight);

mCamera = new Camera();

}

@Override

protected void applyTransformation(float interpolatedTime, Transformation t) {

final float fromDegrees = mFromDegrees;

float degrees = fromDegrees + ((mToDegrees - fromDegrees) * interpolatedTime);

final float centerX = mCenterX;

final float centerY = mCenterY;

final Camera camera = mCamera;

final Matrix matrix = t.getMatrix();

camera.save();

if (mReverse) {

camera.translate(0.0f, 0.0f, mDepthZ * interpolatedTime);

} else {

camera.translate(0.0f, 0.0f, mDepthZ * (1.0f - interpolatedTime));

}

camera.rotateY(degrees);

camera.getMatrix(matrix);

camera.restore();

matrix.preTranslate(-centerX, -centerY);

matrix.postTranslate(centerX, centerY);

}

}