70002914 How to get Y value from X or X from Y with a Polyline

Summary

How to get Y value from X or X from Y with a Polyline

Solution

Using intersect functionality (IntersectWith method) you can get what you want. Note that the polyline must be a 2D polyline!

So try a code like:

 vdPolyline poly = new vdPolyline(doc,new gPoints(new gPoint[] {new gPoint(0,0),new gPoint(1,0), new gPoint(1,1),new gPoint(0,1) }));

 //getYfronX (x = 0.5)
 vdLine line = new vdLine(doc,new gPoint(0.5, 0), new gPoint(0.5, 1));
 gPoints intpts = new gPoints();
 bool suc = poly.IntersectWith(line, VdConstInters.VdIntExtendArg, intpts);
 if(suc && intpts.Count > 0)
 {
     //you can sort the intpts by x or y if you want to get the leftmost or rightmost intersection point
     //see gpoints.SortByX() or gpoints.SortByY()
     //gPoints.Sort -Or- gPoints.shortByPointOrigin
     double y = intpts[0].y;
 }

 //getXfronY (y = 0.5)

 line = new vdLine(doc, new gPoint(0, 0.5), new gPoint(1, 0.5));
 intpts = new gPoints();
 suc = poly.IntersectWith(line, VdConstInters.VdIntExtendArg, intpts);
 if (suc && intpts.Count > 0)
 {
     //add your sorting here if you want to get the topmost or bottom most intersection point
     double x = intpts[0].x;
 }

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