default Rect convertRectFromParent(Rect r) {
        return new Rect(convertPointFromParent(r.origin), r.size);
    }
Converts a rectangle from this node's coordinate system to the given target node's coordinate system

@param r  The rectangle to convert with origin inside this node's coordinate system
@param to The node containing the target coordinate system
@return The converted rectangle
core/src/main/java/mrtjp/projectred/redui/RedUINode.java