public void SubdomainByCentreTest() { var polyCrv = new PolyCurve(new Line(0, 0, 10, 10)); polyCrv.AddArc(new Vector(10, 0)); polyCrv.Add(new PolyLine(new Vector(10, 0), new Vector(5, 0), new Vector(5, -5))); var domain = polyCrv.SubdomainByCentre(0.5, 20); Curve subCrv = polyCrv.Extract(domain); Assert.AreEqual(20, subCrv.Length, 0.00001); }