public void PointOnLineMidpoint()
{
var sketch = Sketch.Create();
var p1 = sketch.AddPoint(new Pnt2d(3, -10));
var p2 = sketch.AddPoint(new Pnt2d(3, 10));
var line = new SketchSegmentLine(p1, p2);
var s1 = sketch.AddSegment(line);
var p3 = sketch.AddPoint(new Pnt2d(-5, -5));
var p4 = sketch.AddPoint(new Pnt2d(20, 20));
var s2 = sketch.AddSegment(new SketchSegmentLine(p3, p4));
var c1 = sketch.AddConstraint(new SketchConstraintPointOnMidpoint(p3, s1));
Assert.IsTrue(sketch.SolveConstraints(true));
var pointOnCurve = new Geom2dAPI_ProjectPointOnCurve(sketch.Points[p3], line.MakeCurve(sketch.Points));
Assert.AreEqual(1, pointOnCurve.NbPoints());
Assert.AreEqual(0.0, pointOnCurve.Distance(1), MaxLengthDelta);
sketch.Points[p3] = new Pnt2d(18, 18);
Assert.IsTrue(sketch.SolveConstraints(true));
pointOnCurve = new Geom2dAPI_ProjectPointOnCurve(sketch.Points[p3], new Geom2d_Line(line.GetLine(sketch.Points)));
Assert.AreEqual(1, pointOnCurve.NbPoints());
Assert.AreEqual(0.0, pointOnCurve.Distance(1), MaxLengthDelta);
Assert.AreEqual(pointOnCurve.Point(1).Distance(sketch.Points[p1]), pointOnCurve.Point(1).Distance(sketch.Points[p2]), MaxLengthDelta);
}
