public OffsetCoordinate(CoordinateVM worldCoordinate, Coordinate offset)
{
_worldCoordinate = worldCoordinate;
_offset = offset;
_worldCoordinate.PointChanged += OnPointChanged;
}
public GridLineVM(
CoordinateVM start,
CoordinateVM end,
bool isHorizontal,
Func <(CoordinateVM modelPos, Point offset), OffsetCoordinate> offsetCoordFactory)
