GetPoint on DynamicDrawing problem

Rhino Developer
1

hello everyone.
i can’t snap to horizontal line or vertical line on DynamicDrawing .
there is a example.
123
and this is my code

protected override Result RunCommand(RhinoDoc doc, RunMode mode)
        {
            var type = ObjectType.Annotation | ObjectType.Surface | ObjectType.Point | ObjectType.Brep | ObjectType.Curve;
            doc.Views.ActiveView.ActiveViewport.DisplayGrips(true, type);

            var result = RhinoGet.GetGrips(out var grips, "Select Grips");
            if (result != Result.Success)
            {
                doc.Views.ActiveView.ActiveViewport.DisplayGrips(false, type);
                return result;
            }

            var basePoint = Point3dEx.Average(grips.Select(g => g.CurrentLocation));
            var plane = doc.Views.ActiveView.ActiveViewport.ConstructionPlane();

            var lines = new List<Line>();
            var get = new GetPoint();
            get.SetCommandPrompt("Enter");
            get.PermitObjectSnap(true);
            get.PermitOrthoSnap(true);
            

            get.DynamicDraw += (s, e) =>
            {
                lines.Clear();
                var vecX = e.CurrentPoint - basePoint;
                var vecY = Vector3d.CrossProduct(plane.ZAxis, vecX);
                var pln = new Plane(e.CurrentPoint, vecY, plane.ZAxis);

               
                foreach (var item in grips)
                {
                    var p = pln.ClosestPoint(item.CurrentLocation);
                    var line = new Line(item.CurrentLocation, p);
                    e.Display.DrawLine(line, get.DynamicDrawColor);
                    lines.Add(line);
                }
            };

            get.Get();
            if (get.CommandResult() != Result.Success)
            {
                doc.Views.ActiveView.ActiveViewport.DisplayGrips(false, type);
                return get.CommandResult();
            }

            foreach (var item in lines)
            {
                doc.Objects.AddLine(item);
            }
            doc.Views.Redraw();

            return Result.Success;
        }

thanks

2

Oh,I’ve fixed the problem，

get.SetBasePoint(basePoint, false);

use this method,it’s ok! :smiley: