Getting Start and End Coordinates on the first segment of a PolyLine
@johnyDFFXO wrote:
If you are working with lwpolylines look and learn vlax-curve-* functions.
....
That's how I would do it. But it's not limited to LWPolylines -- the same works for "heavy" 2D and 3D Polylines, with integer parameter values being at the vertices. [It works for other things, too, but what the parameter values represent varies with the object type.]
@greglcroth wrote:
.... (10 4802.xxx-xxxxxxxx 5070.xxx-xxxxxxxx) ....
I don't know why all those "xxxx" showed up. Those are just regular coordinate numbers on my screen, for some reason the cut/paste isn't translating.) ....
As for that, it happens to numbers of a certain number of digits, which "the system" suspects are AutoCAD serial numbers, and it changes them to the x's to prevent divulging such sensitive information. The hyphen it adds is a component of their serial numbers, so it's a little odd that it suspects that with strings of numbers that don't include a hyphen, but somehow it does. If you reduce the number of decimal places [it's hard to imagine you could really need so many -- are you working with angstroms or something?], that won't happen.
@greglcroth wrote:
I want to select the last entity drawn, which will always be a polyline in the routine, and get the direction of the first segment. ....
Ended up doing this. ....
One advantage of the approach you ended up with [which may not matter to your specific usage] is that it would work even if the Polyline starts with an arc segment, and also with lots of other entity types -- a Line, Spline, Ray, Xline, and though it might get the direction from the end you don't intend, an Arc or partial Ellipse, and though it might be meaningless for your purposes, even a Circle.
But given your original description, it looks like your solution has more to it than you need. To simply get the starting direction of the last object drawn, you could do just this much:
