// modify the canvas itself
@Override
public synchronized ICanvas setSize(V2 size) {
// reset size
this.size = size;
// reset camera
if (use_camera) camera.setProjectionSize(size);
return this;
}
@Override
public synchronized ICanvas setCamera(ICamera camera) {
// attach camera and reset its field size
this.camera = camera;
camera.setProjectionSize(size);
// maintain invariant: (camera == null) => use_camera = false
if (!use_camera && camera != null) use_camera = true;
else if (camera == null) use_camera = false;
return this;
}