create polyline circle

[wang890]

say i can calculate the coordinate of the 4 quandrant points of a circle 

how do you create arcs and convert to polyline that's point together? 

or simpler just create polyline with arc segments?

see picture. haven't program for a long time and mind is blanked out.

picture on the left shows 4 points which i can calculate. picture on the right is what i need to create as polyline segments that's one polyline and then using civil 3d api code to take over and convert to a featureline so people can use it for grading or something.

[_gile]

Hi,

You can try this way:

Polyline pline = new Polyline(2);
pline.AddVertexAt(0, new Point2d(center.X + radius, center.Y), 1.0, 0.0, 0.0);
pline.AddVertexAt(1, new Point2d(center.X - radius, center.Y), 1.0, 0.0, 0.0);
pline.Closed = true;