.NET

Reply
Active Contributor
xdbk07
Posts: 42
Registered: ‎11-06-2012
Message 1 of 7 (447 Views)
Accepted Solution

Polyline with Arc

447 Views, 6 Replies
08-23-2013 12:36 AM

Hi everyone,

 

I'm having a problem when I create polyline with arc using vb.net. The arc is a quarter of ellipse. Please see picture below for detail.

test.png

 


Thanks any helps.

Thank Gilles. This is exactly what I’m looking for.

Active Contributor
R.Gerritsen4967
Posts: 47
Registered: ‎07-31-2009
Message 2 of 7 (440 Views)

Re: Polyline with Arc

08-23-2013 12:52 AM in reply to: xdbk07

An ellipse is not an arc and cannot be joined to a polyline.

 

Maybe you can try to facet the ellipse. With this you turn the ellipse into a polyline that's almost (but not exactly!) following the same path as the ellipse.

 

Here's an excellent explanation, including some code...

 

http://through-the-interface.typepad.com/through_the_interface/2009/12/faceting-autocad-curves-using...

Active Contributor
xdbk07
Posts: 42
Registered: ‎11-06-2012
Message 3 of 7 (434 Views)

Re: Polyline with Arc

08-23-2013 01:10 AM in reply to: R.Gerritsen4967

How about SPLINE! Can we create a spline like blue arc (in picture)?

 

Thanks,

 

*Expert Elite*
_gile
Posts: 2,106
Registered: ‎04-29-2006
Message 4 of 7 (416 Views)

Re : Polyline with Arc

08-23-2013 04:38 AM in reply to: xdbk07

Hi,

 

Have a look at the GeometryExtensions library, specialy the PolylineSegment and PolylineSegmentCollection classes.

There's an example on how to use them here.

Gilles Chanteau
Active Contributor
xdbk07
Posts: 42
Registered: ‎11-06-2012
Message 5 of 7 (395 Views)

Re : Polyline with Arc

08-24-2013 12:31 AM in reply to: _gile

Thank for help. Are there any way to draw only a quarter of ellipse. 

*Expert Elite*
_gile
Posts: 2,106
Registered: ‎04-29-2006
Message 6 of 7 (387 Views)

Re : Polyline with Arc

08-24-2013 03:47 AM in reply to: xdbk07

You can set the StartAngle and EndAngle properties of the Ellipse instance. Angles are measured in radians CCW from the MajorAxis vector.

Gilles Chanteau
Active Contributor
xdbk07
Posts: 42
Registered: ‎11-06-2012
Message 7 of 7 (345 Views)

Re : Polyline with Arc

08-27-2013 10:39 PM in reply to: _gile

Thank Gilles. This is exactly what I’m looking for.

Post to the Community

Have questions about Autodesk products? Ask the community.

New Post
Need installation help?

Start with some of our most frequented solutions or visit the Installation and Licensing Forum to get help installing your software.