public _Diagonal(
_CornerId beginId,
_CornerId endId)
{
this.beginId = beginId;
this.endId = endId;
}
Offset _cornerFor(Rect rect, _CornerId id)
{
switch (id)
{
case _CornerId.topLeft: return(rect.topLeft);
case _CornerId.topRight: return(rect.topRight);
case _CornerId.bottomLeft: return(rect.bottomLeft);
case _CornerId.bottomRight: return(rect.bottomRight);
}
return(Offset.zero);
}
