convertPointToBoxSpace method
Converts a point from the local coordinate system of the node to the coordinate system of the SpriteBox.
Point pointInBoxCoordinates = myNode.convertPointToBoxSpace(localPoint);
Implementation
Offset convertPointToBoxSpace(Offset nodePoint) {
assert(nodePoint != null);
assert(_spriteBox != null);
Vector4 v =_nodeToBoxMatrix().transform(new Vector4(nodePoint.dx, nodePoint.dy, 0.0, 1.0));
return new Offset(v[0], v[1]);
}