localToGlobal method
Convert the given point from the local coordinate system for this box to the global coordinate system in logical pixels.
If ancestor is non-null, this function converts the given point to the
coordinate system of ancestor (which must be an ancestor of this render
object) instead of to the global coordinate system.
This method is implemented in terms of getTransformTo.
Implementation
Offset localToGlobal(Offset point, { RenderObject ancestor }) {
return MatrixUtils.transformPoint(getTransformTo(ancestor), point);
}