Topic: Pline endpoint/angle question

[CAB]

To get the angle of the polyline at each end perhaps this will do it.
This handles arc segments & can be used with splines.

Code: [Select]

  (vl-load-com)
  (setq curve (car (entsel "\nSelect polyline: ")))
  (setq end_param (vlax-curve-getendparam curve))
  (setq startang (angle '(0 0) (vlax-curve-getFirstDeriv curve 0.05)))
  (setq endang (angle '(0 0) (vlax-curve-getFirstDeriv curve (- end_param 0.05))))

[Guest]

Where reads the calls for insertblock, just replace the 1.0's with the return of LTSCALE and rock and roll:

You're making this WAAAAAY too easy for me.   And I thank you for that!

Who's #1?? YOU are!

[LE]

!

 

Thanks.

I am playing (writing right now as part of my learning phase) with the routine, now with C#, as soon as I know how to use the insert method, I will post it, and see if runs faster....

[T.Willey]

I am playing (writing right now as part of my learning phase) with the routine, now with C#, as soon as I know how to use the insert method, I will post it, and see if runs faster....

I think I remembering reading on one site that you have to create all the atrributes associated with the blocks definition when using C#.  FYI....

[LE]

Thank you Tim;

Yes I am aware about that, have read a LOT... anyway this does not have attributes and I have open a new topic here:

http://www.theswamp.org/index.php?topic=13836.msg166838#msg166838

Just for fun.

[sinc]

To get the angle of the polyline at each end perhaps this will do it.
This handles arc segments & can be used with splines.

Code: [Select]

  (vl-load-com)
  (setq curve (car (entsel "\nSelect polyline: ")))
  (setq end_param (vlax-curve-getendparam curve))
  (setq startang (angle '(0 0) (vlax-curve-getFirstDeriv curve 0.05)))
  (setq endang (angle '(0 0) (vlax-curve-getFirstDeriv curve (- end_param 0.05))))

The only thing that I might do differently is use the distance commands to get the end angle.  For example, you could get the parameter for the point that is 0.001 from the end of the line, then get the First Derivative of that.

The problem with subtracting parameters is that the size varies in polylines, depending on the length of the segment.  So it's possible that your .05 parameter might be 1, 10, or 20 feet from the end of the line.

[CAB]

I was perplexed as to how best to approach that aspect. I got the vlax-curve-getFirstDeriv idea from one of your
previous posts. The problem with distance is that the opposite may be true. There could be very little distance between
the two parameters. I suppose you would have to do some sort of distance checking to be sure of what you were dealing
with before settling on a value to use for the distance.

I was just being lazy with my 0.05 parameter & hoping it would be OK.
I did consider a check of the value but was holding off to see if anyone would actually use it.


Glad to see someone was paying attention. 

[Guest]

Okay... I've got one other question...  How do you obtain the layer name of the pline??  Right now I'm using this:

Code: [Select]

(setq objLay (cdr (assoc 8 (entget curve))))
But what's the vlisp way?

Thanks again!

[LE]

Glad to see someone was paying attention. 

Alan;

I ALWAYS put attention, and will try to provide a solution, every time I can.

I will do your recommendation into the new C# routine approach I posted in the NET forum, once I get a chance.

Cheers.

[LE]

Code: [Select]

(setq objLay (cdr (assoc 8 (entget curve))))
But what's the vlisp way?

Matt;

Look into VLA-GET-LAYER and VLA-PUT-LAYER functions.

[Guest]

Matt;

Look into VLA-GET-LAYER and VLA-PUT-LAYER functions.

WHAT??!?!?!  You expect ME to do some work now??!?  Sheesh... the nerve of some people. 


I'll look into that and thanks again.  (and if you post back with the solution, I'm NOT gonna read it).

[LE]

(and if you post back with the solution, I'm NOT gonna read it).

OK.

[CAB]

Glad to see someone was paying attention. 

Alan;

I ALWAYS put attention, and will try to provide a solution, every time I can.

I will do your recommendation into the new C# routine approach I posted in the NET forum, once I get a chance.

Cheers.

I know it would be hard to sneak anything past you Luis.

[Guest]

[Quagmire - Family Guy]Heh heh.... Alright![/Quagmire]

(setq objLay (vla-get-layer (vlax-ename->vla-object curve)))

SWEEEET!!!

[LE]

I know it would be hard to sneak anything past you Luis.

I have attached the command ADDTICKS (just for A2007), if anyone would like to try it - for lwpolylines and splines.

HTH

http://www.theswamp.org/index.php?topic=13836.msg167054#msg167054