Points along a lwpoly arc

[tozjerimiah]

Hi,

 

Firstly I should probably say I am using VBA...

 

I have created code which will output coordinates for polylines. This info is then transformed to WGS84 & displayed on google maps.

 

My issue is that google maps will not draw curves. I therefore want to split lwpoly curves into segments of a fixed length (say 100mm), and output the coordinates.

 

I have the start coords of the arc, the end coords, the bulge. I am able to get the radius, arc length etc, but I'm struggling to determine fixed points along the arc.

 

If anyone can help I would be very grateful!

 

Thanks

Toz

[SEANT]

VBA does not have any direct access to all of AutoCAD’s curve analysis functionality (unlike AutoLisp, VB.NET, etc). There is a third party hook out there; search for Curve.cls and Vlax.cls. That hook, unfortunately, has a couple of problems that may crop up in certain situations.

 

It is possible, however, to mimic some of those functions mathematically. For instance, to subdivide a polyline bulge see the attached examples (DWG and XLS).

Edited August 22, 2010 by SEANT
Removed buggy spreadsheet

[tozjerimiah]

Phenomenally useful. Thanks!!

[SEANT]

The previous spreadsheet had bugs (thanks for bringing those to my attention, tozjerimiah ).

 

This newer version should perform better, I hope.

FacetBulge_rev1.zip

Edited August 22, 2010 by SEANT

[tozjerimiah]

The previous spreadsheet had bugs (thanks for bringing those to my attention, tozjerimiah ).

 

This newer version should perform better, I hope.

 

Yes it works! Thanks.