Get XY coordinates of PLINE with arcs etc...

[jholdawayUKBGN]

How can I calculate the xy coordinates along a PLINE that has lines, arcs, etc...

In the attached screenshot, I would like to get an array of x,y coordinates along this PLINE that can contain any sort of line like arcs.

Any advice?

[Jeff_M]

That is what the GetPointAtParameter() method does. Each vertex is typically a whole number parameterso to get the point at the middle of the first arc (assuming the pline was created left to right):

var pt = oPline.GetPointAtParameter(3.5);

This returns a Point3d. Convert it to a Point2d if really needed.

[jholdawayUKBGN]

What is 3.5?

So if I wanted points along that arc how do I get that?

[Jeff_M]

The 3.5 is the midpoint between Parameter 3 and Parameter 4. The first vertex is Parameter 0. For any point along the first arc it will be 3.xxx where xxx is the percent along the arc to get the point.