GuestureParams.java

boolean onRotate(RotateGestureDetector detector) {
    // ...
    rotationInDegrees -= detector.getRotationDegreesDelta();
}
boolean onScale(ScaleGestureDetector detector) {
    // ...
    scale += (detector.getScaleFactor() - 1.0F);
}
boolean onMove(MoveGestureDetector detector) {
    // ...
    x += moveDetector.getFocusDelta().x / canvasWidth;
    y += moveDetector.getFocusDelta().y / canvasHeight;
}