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Active Contributor
Posts: 42
Registered: ‎07-02-2013
Message 1 of 9 (256 Views)

Point on line

256 Views, 8 Replies
07-09-2013 04:52 AM

Hi,

Is there any function available to find out if a point is present on a line or not?Please help.

Thanks

Gulzar

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Moderator
Posts: 1,323
Registered: ‎04-09-2008
Message 2 of 9 (250 Views)

Re: Point on line

07-09-2013 05:47 AM in reply to: gulzar25
```Point3d p; // Given point

Curve crv; // Given curve, eg. Line, Polyline, Circle, etc...

Point3d pNear = crv.GetClosestPointTo(p);

if (pNear.DistanceTo(p) < Tolerance.Global.EqualPoint)
{

// Point is on Curve

}```

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Active Contributor
Posts: 42
Registered: ‎07-02-2013
Message 3 of 9 (205 Views)

Re: Point on line

07-09-2013 08:57 PM in reply to: gulzar25

Hi Alexander,

Thankyou so much for the reply but if i declare pNear as Point3d, GetClosestPointTo() function doesnt accept as it returns PointOnCurve3d and if i declare pNear as Point3d i cant access DistanceTo() function.Kindly help.

Thanks

Gulzar

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Posts: 1,323
Registered: ‎04-09-2008
Message 4 of 9 (197 Views)

Re: Point on line

07-09-2013 10:39 PM in reply to: gulzar25
```using System;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.EditorInput;

[assembly: CommandClass(typeof(Rivilis.CurveUtils))]

namespace Rivilis
{
public class CurveUtils
{
[CommandMethod("PointOnCurve")]
public void MyCommand() // This method can have any name
{
Document doc = Application.DocumentManager.MdiActiveDocument;
Editor ed = doc.Editor;

PromptEntityOptions peOpt = new PromptEntityOptions("\nSelect curve: ");
peOpt.SetRejectMessage("\nMust be Curve!");  peOpt.AddAllowedClass(typeof(Curve), false);
PromptEntityResult peRes = ed.GetEntity(peOpt);
if (peRes.Status != PromptStatus.OK) return;

PromptPointResult ppRes = ed.GetPoint("\bPick point: ");
if (ppRes.Status != PromptStatus.OK) return;

Point3d p = ppRes.Value.TransformBy(ed.CurrentUserCoordinateSystem);

using (Transaction tr = doc.TransactionManager.StartTransaction()) {

Curve crv = tr.GetObject(peRes.ObjectId, OpenMode.ForRead) as Curve;
if (crv != null) {
Point3d pNear = crv.GetClosestPointTo(p, false);
if (pNear.DistanceTo(p) < Tolerance.Global.EqualPoint) {
ed.WriteMessage("\nPoint is on Curve");
} else {
ed.WriteMessage("\nPoint is not on Curve");
}
}
}
}
}
}
```

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Active Contributor
Posts: 42
Registered: ‎07-02-2013
Message 5 of 9 (197 Views)

Re: Point on line

07-09-2013 10:39 PM in reply to: Alexander.Rivilis

Hi,

If i have 2 points on the same line the code is working fine for 1 point and for the other point it is not satisfying the condition ("if (pNear.DistanceTo(p) < Tolerance.Global.EqualPoint)") even though the second point is on the given line.I am not able to figure out why this is happening.I will be grateful for replies.

Thanks Gulzar

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Moderator
Posts: 1,323
Registered: ‎04-09-2008
Message 6 of 9 (184 Views)

Re: Point on line

07-10-2013 12:27 AM in reply to: gulzar25

Ok! You can replace in code Tolerance.Global.EqualPoint with 0.001 (or other small value).

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Active Contributor
Posts: 42
Registered: ‎07-02-2013
Message 7 of 9 (179 Views)

Re: Point on line

07-10-2013 12:35 AM in reply to: Alexander.Rivilis

Hi Alexander,

Thanks for the reply.What i meant when i said that it is not satisfying the condition ("(pNear.DistanceTo(p) < Tolerance.Global.EqualPoint)") is distance is coming greater than tolerance value(for example 100).Even though the point is on the line for which im checking.I dont know why this is happening.

Thanks

Gulzar

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Moderator
Posts: 1,323
Registered: ‎04-09-2008
Message 8 of 9 (170 Views)

Re: Point on line

07-10-2013 01:58 AM in reply to: gulzar25

I think the line and a point are in 3D. Double check the coordinates of the given point and the nearest point on the line.

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Mentor
Posts: 212
Registered: ‎11-09-2012
Message 9 of 9 (143 Views)

Re: Point on line

07-11-2013 07:33 AM in reply to: gulzar25

if your problem is not solved yet , you can go through this article. I hope this will solve your problem.

http://through-the-interface.typepad.com/through_the_interface/2012/01/testing-whether-a-point-is-on...

Regards

Zakir

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