How do I get the length and vertex values of a simple edge

ron_moreland

Is there a simple example of how to query an edge for length and vertices? I've looked through several .fs examples and I get lost on what is relevant to my question. In particular the concept of context. If I pass in the edge in precondition, what should the context be when I query that edge?

ilya_baran

If you haven't already, I really recommend going through the slot tutorial: https://cad.onshape.com/FsDoc/tutorials/create-a-slot-feature.html
That should orient you with respect to the right concepts and the second tutorial shows an example with qVertexAdjacent and evVertexPoint for grabbing edge endpoints and their coordinates.  evLength can also be used directly on an edge.

There's usually only one relevant context -- the one passed into a feature is the one you pass to evaluation functions.

ilya_baran

If you haven't already, I really recommend going through the slot tutorial: https://cad.onshape.com/FsDoc/tutorials/create-a-slot-feature.html
That should orient you with respect to the right concepts and the second tutorial shows an example with qVertexAdjacent and evVertexPoint for grabbing edge endpoints and their coordinates.  evLength can also be used directly on an edge.

There's usually only one relevant context -- the one passed into a feature is the one you pass to evaluation functions.

ron_moreland

Thanks, I'll go through it again. It's been a while.I haven't looked at the second example.

ilya_baran

Don't hesitate to ask if this is not clear after that.

ron_moreland

I went though the examples. The second was particularly helpful, It brought up a couple points I hadn't thought of and explain the solution. The warnings about "qNthElement" and entity order was interesting. I didn't consider the problem I could encounter with that.
Thanks for the help.