resize method
If the ParallaxComponent
isn't used your own wrapper needs to call this
on creation.
Implementation
void resize(Vector2 newSize) {
if (!isSized) {
_size = Vector2.zero();
}
if (newSize != _size || !isSized) {
_size.setFrom(newSize);
_clipRect = _size.toRect();
layers.forEach((layer) => layer.resize(_size));
}
isSized |= true;
}