public boolean applyFrameTransform(GL10 gl, GraphName frame) {
Preconditions.checkNotNull(frame);
if (this.frame != null) {
FrameTransform frameTransform = frameTransformTree.transform(frame, this.frame);
if (frameTransform != null) {
OpenGlTransform.apply(gl, frameTransform.getTransform());
return true;
}
}
return false;
}
/**
* Changes the camera frame to the specified frame.
*
* <p>If possible, the camera will avoid jumping on the next frame.
*
* @param frame the new camera frame
*/
public void setFrame(GraphName frame) {
Preconditions.checkNotNull(frame);
synchronized (mutex) {
if (this.frame != null && this.frame != frame) {
FrameTransform frameTransform = frameTransformTree.transform(frame, this.frame);
if (frameTransform != null) {
// Best effort to prevent the camera from jumping. If we don't have
// the transform yet, we can't help matters.
transform = transform.multiply(frameTransform.getTransform());
}
}
this.frame = frame;
}
}