Prompt point with ortho mode

youssefGC — Mon, 05 May 2025 11:49:06 GMT

Is there a way to control the orthogonal mode at the prompt level?

For example, I retrieve two points (P1, P2), and then I want to retrieve a third point (P3). However, I want to impose a condition: the line formed by P3 and P2 must be perpendicular to the line (P1, P2). Otherwise, I need to enforce the orthogonal mode. Can this be achieved?

Re: Prompt point with ortho mode

ActivistInvestor — Mon, 05 May 2025 15:57:12 GMT

Here's an example that was quickly adapted from a jig I've used to obtain a point that lies on any type of Curve. You can use a LineSegment3d as the curve argument to get a point on that line that's perpendicular to the current cursor location.

using System; using Autodesk.AutoCAD.ApplicationServices; using Autodesk.AutoCAD.DatabaseServices; using Autodesk.AutoCAD.EditorInput; using Autodesk.AutoCAD.Geometry; using Autodesk.AutoCAD.GraphicsInterface; using Autodesk.AutoCAD.Runtime; namespace AcMgdLib.Geometry { /// <summary> /// Acquires a point that is constrained to be /// on a curve, perpendicular/nearest to the /// selected point. /// </summary> public class PointOnCurveJig : DrawJig { Curve3d curve; bool flag = false; Point3d last = Point3d.Origin; Point3d basePoint; string message; public PointOnCurveJig(Curve3d curve, string message = null) { this.curve = curve; this.basePoint = curve.StartPoint; this.message = message ?? "\nPoint on curve: "; } /// <summary> /// The resulting point on the Curve3d that /// was passed to the constructor. /// </summary> public Point3d PointOnCurve => basePoint; /// <summary> /// The other endpoint of the perpendicular /// line, that was picked by the user. /// </summary> public Point3d PickedPoint => last; protected override SamplerStatus Sampler(JigPrompts prompts) { var options = new JigPromptPointOptions(); options.Message = this.message; options.UserInputControls = UserInputControls.UseBasePointElevation; options.Cursor = CursorType.RubberBand; options.UseBasePoint = true; options.BasePoint = basePoint; PromptPointResult ppr; using(new SystemVariable("ORTHOMODE", 0)) { ppr = prompts.AcquirePoint(options); } if(ppr.Status == PromptStatus.OK) { last = ppr.Value; basePoint = curve.GetClosestPointTo(last).Point; return SamplerStatus.OK; } return SamplerStatus.Cancel; } protected override bool WorldDraw(WorldDraw draw) { return true; } [CommandMethod("POINTONCURVEJIG")] public static void PointOnCurveJigExample() { var doc = Application.DocumentManager.MdiActiveDocument; var ed = doc.Editor; var peo = new PromptEntityOptions("\nSelect a curve: "); peo.SetRejectMessage("\nInvalid, requires a Curve"); peo.AddAllowedClass(typeof(Curve), false); var per = ed.GetEntity(peo); if(per.Status != PromptStatus.OK) return; Curve3d curve3d; using(var tr = new OpenCloseTransaction()) { var curve = (Curve)tr.GetObject(per.ObjectId, OpenMode.ForRead); curve3d = curve.GetGeCurve(); tr.Commit(); } var jig = new PointOnCurveJig(curve3d); var res = doc.Editor.Drag(jig); if(res.Status == PromptStatus.OK) { using(new SystemVariable("OSMODE", 0)) { ed.Command("._LINE", jig.PointOnCurve, jig.PickedPoint, ""); } } } } public class SystemVariable : IDisposable { string name; object value; public SystemVariable(string name, object value) { this.value = Application.GetSystemVariable(name); this.name = name; Application.SetSystemVariable(name, value); } public void Dispose() { if(value != null) { Application.SetSystemVariable(name, value); value = null; } } } }

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Prompt point with ortho mode

Re: Prompt point with ortho mode