Topic: Mimic the Civil3D function to color the selected path

[huiz]

Is it possible to mimic the way Civil3D colors the path while selecting, using a jig? And if so, does it not use a lot of resources to continuously calculate a part of a polyline while moving around?

In Civil3D, for example, if you split a Parcel, you can select the path along a Parcel line and while dragging the mouse, you see a colored line along the Parcel lines from the first selected point to the place where the cursor is, untill you click.

I know it is possible to split a polyline with Curve.GetSplitCurves() but is that the way to get a part of the polyline and show it as a jig? Or are there smarter functions to do this?

[Gasty]

Hi,

I'm not sure as I'm not a C3D user or developer, but you can try with a combination of point monitor, transient graphics, and some clever treatment of the polyline segments. The are good examples of point monitor and transient graphics out there, just google a little.

Gaston Nunez

[n.yuan]

I do not use Civil3D, therefore not very sure what the feature you are referring does. But I can guess what you want and just did a quick enhancement to one my existing piece of code. Instead of post incomplete portion of that code, I though it would be better to post it as whole in my blog.

Here is the link:

http://drive-cad-with-code.blogspot.ca/2014/09/moving-mouse-cursor-to-trace-polyline.html

HTH

[huiz]

Wow Norman! It is exactly what I described! Thank you very much for this code!

I would be happy already with some tips, but full working code is really cool! Saves me a lot of time to implement.

[insmur]

Firstly , thanks your code, it is real awesome but I have a question.

It is working only line, what about arc?

[n.yuan]

Well, you need to update to code (the "DrawTransientGraphics()" method in my article) to draw the transient graphics correctly. For straight line/segment, it is easy, as the code shows; but it is arc/curved segment, you need to figure/calculate the arc/curve's radius and calculate the arc/curve's length according to current cursor location. It should be a simple math work, I suppose.