Rectangle Lines

[Anonymous]

Any simple method to check whether a polyline or (set of 4 lines) is a rectangle?

[Anonymous]

Any code simpler than this?

                                bool blnRectangle = false;
                                if (polyline.NumberOfCoordinates == 5) {
                                    if (PointsAreEqual(polyline.GetCoordinate(0), polyline.GetCoordinate(4))) {
                                        Line line1 = Line.CreateBound(polyline.GetCoordinate(0), polyline.GetCoordinate(1));
                                        Line line2 = Line.CreateBound(polyline.GetCoordinate(1), polyline.GetCoordinate(2));
                                        Line line3 = Line.CreateBound(polyline.GetCoordinate(2), polyline.GetCoordinate(3));
                                        Line line4 = Line.CreateBound(polyline.GetCoordinate(3), polyline.GetCoordinate(4));
                                        if (DoubleValuesAreEqual(line1.Length,line3.Length) && DoubleValuesAreEqual(line2.Length, line4.Length)) {
                                            double dblRad = line1.Direction.AngleTo(line2.Direction)/Math.PI;
                                            if (DoubleValuesAreEqual(dblRad, 0.5))
                                                blnRectangle = true;
                                        }
                                    }
                                }

[aignatovich · Accepted solution]

Hi!

You can create curveloop from your lines, than perform a check:

curveloop.HasPlane() && curveloop.IsRectangular(curveloop.GetPlane())

[Anonymous]

The method is simple. Thanks.

Anyway to check lines is a curve loop is not so simple, right?

[aignatovich]

Yep, but It depends on your task, may be some factors will help you.

Polyline coordinates are subsequent, so they form the curveloop, but it can be open, check curveloop.IsOpen() also