Polyline with Arc

[ditran7577]

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.

Thanks any helps.

[R.Gerritsen4967]

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...

[ditran7577]

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

Thanks,

[_gile]

Hi,

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

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

[ditran7577]

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

[_gile]

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

[ditran7577 · Accepted solution]

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