/// <summary>
/// Sets the index-th edge of this polygon.
/// </summary>
public static IImmutablePolygon <V2d> SetEdge(this IImmutablePolygon <V2d> self, int index, Line2d edge)
{
index = self.RepairIndex(index);
var i0 = index++;
var i1 = index < self.Count ? index : 0;
return(self.SetPoint(i0, edge.P0).SetPoint(i1, edge.P1));
}
/// <summary> /// Returns new polygon with point transformed. /// </summary> public static IImmutablePolygon <V2d> TransformPoint(this IImmutablePolygon <V2d> self, int index, M33d trafo) => self.SetPoint(index, trafo.TransformPos(self.Points[index]));
/// <summary> /// Returns new polygon with point moved. /// </summary> public static IImmutablePolygon <V2d> MovePoint(this IImmutablePolygon <V2d> self, int index, V2d delta) => self.SetPoint(index, self.Points[index] + delta);
