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The attached is a work in progress, but try it out. Some of the things I would like to change have to do with contour lines at different elevations, since I have seen topographical drawings in which each contour line is actually at its designated elevation. The attached would not work on such a drawing, because the IntersectWith method requires the intersecting things to be at the same elevation. Some other things in the description at the top are also "wish list" items, and are not true yet, either. But for things in the same plane in the World Coordinate System, it seems to work, for both open-ended and closed contours. And it can use certain things other than Polylines, and has some other bells and whistles I took from another routine I wrote.
If it works for you, I will continue to refine it, though I'm now thinking about making something with much wider application [for example, something that would let the User choose *any* number of intermediate strokes, or choose to draw lines of any specified length, not just toward another selected object, or choose to draw them centered on the selected path rather than to one side, etc., etc.]. If I come up with something that does all the things I have in mind, it would do what you want with the right options, but would also do many other things.
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Kent Cooper
If it works for you, I will continue to refine it, though I'm now thinking about making something with much wider application [for example, something that would let the User choose *any* number of intermediate strokes, or choose to draw lines of any specified length, not just toward another selected object, or choose to draw them centered on the selected path rather than to one side, etc., etc.]. If I come up with something that does all the things I have in mind, it would do what you want with the right options, but would also do many other things.
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Kent Cooper
Kent Cooper, AIA 
I wouldn't want to lay claim to a thread, partly because someone else might be able to provide a solution sooner than I might, and partly to see what people come up with and perhaps learn something. You can step on my toes all you want [as they say, I only use the bottoms, so someone may as well use the tops]. I was partway into working something out when I saw your suggestion come in, so I was content to lay back until the OP responded, to find out whether it worked for them [I didn't test it myself, though I did look at it briefly, enough to see that we had the same ideas about how to handle parts of the problem]. I only posted my thing after they responded, because I knew mine would work on open Polylines. But now I've got my sights on the broader concept I mentioned before, since I figured it might be useful to have something that would include other options beyond the very particular original question.
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Kent Cooper
MelFranks wrote...
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I didn't realize you were working on this since several days had passed without a reply.
Maybe one should call "I got it" when the pass is thrown. 🙂
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Kent Cooper
MelFranks wrote...
....
I didn't realize you were working on this since several days had passed without a reply.
Maybe one should call "I got it" when the pass is thrown. 🙂
....
Kent Cooper, AIA
That is exactly the reason why I wondered in my first post whether you really want the lines drawn perpendicular *from* the first selected contour line, rather than perpendicular *to* the second one. But even the other way, you will sometimes get situations where it doesn't do what you would prefer. Go back there and try my suggested routine, with and without the "per" code line in it. It doesn't do the intermediate strokes [I didn't know about those yet, at the time], but if what it does with the full-length lines is more like what you want, it can easily be made to do the rest.
I think it would be very difficult to define exactly what "drawn correctly" would mean, if sometimes it means perpendicular to the first contour, sometimes it means perpendicular to the second one, and sometimes it means to the closest point on the second one, which may not be perpendicular to either. I wonder whether dividing both contours into the same number of equal segments would look more like what you want. But writing code for that would take some care, because open-ended contour lines might be drawn in opposite directions, or closed ones might not have their starting points close to each other.
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Kent Cooper
m45bgz wrote...
....drawing of slopes in the opened contour in some places is drawn very long lines. ..... If you can, edit the lisp that all was drew correctly.
I think it would be very difficult to define exactly what "drawn correctly" would mean, if sometimes it means perpendicular to the first contour, sometimes it means perpendicular to the second one, and sometimes it means to the closest point on the second one, which may not be perpendicular to either. I wonder whether dividing both contours into the same number of equal segments would look more like what you want. But writing code for that would take some care, because open-ended contour lines might be drawn in opposite directions, or closed ones might not have their starting points close to each other.
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Kent Cooper
m45bgz wrote...
....drawing of slopes in the opened contour in some places is drawn very long lines. ..... If you can, edit the lisp that all was drew correctly.
Kent Cooper, AIA
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