Draughting an Arrow

[Tharwat]

Hello,

I have made this small Lisp to draw a small arrow, But it does not work with vertical or angular directions. So any ideas to force that this Lisp to work properly at all directions ?.

(defun c:arrow (/ p1 Len Alen p2 p3)
(setq p1 (getpoint	"\nSpecify Start point of Arrow:")
     p2 (getpoint p1 	"\nSpecify End point of Arrow:")
     dist (distance p1 p2)
     vrt (/ dist 3)
     p3 (list (car p2)(- (cadr p2) vrt))
     p4 (list (car p3) (+ (cadr p3)(* vrt 2))) )
(setq old (getvar 'osmode) new (setvar 'osmode 0))
(vl-cmdf "_.pline" p1 "_w" 0 0 p3 p4 "_c" )
(vl-cmdf "_.-hatch" "_s" (entlast) "" "_p" "_solid" "" "")
(setvar 'osmode old)
 (princ))

 

Tharwat

[fixo]

Take a look at ORTHOMODE system variable

 

~'J'~

[Tharwat]

Actually the ORTHOMODE can't affect on my Lisp due to the (cadr value) or I can

call it the predesigned or precast Lisp.

 

Tharwat

[jammie]

You may need to introduce a few extra calcs to get it to work. The functions POLAR & ANGLE should be useful

 

Just a s sample, working with your code

 

     (setq  dist (distance p1 p2)
     vrt (/ dist 3))
     (setq  pickAngle (angle p1 p2))

     (setq p3 (polar p2 (+ pickAngle (/ pi 2)) vrt))
     (setq p4 (polar p2 (- pickAngle (/ pi 2)) vrt))

      ))

 

There could be some additional considertaions possibly, ANGDIR setvar

[Michaels]

You may need to introduce a few extra calcs to get it to work. The functions POLAR & ANGLE should be useful

Just a s sample, working with your code

There could be some additional considertaions possibly, ANGDIR setvar

Thank you jammie, That's really helpful.

[Tharwat]

You may need to introduce a few extra calcs to get it to work. The functions POLAR & ANGLE should be useful

 

Just a s sample, working with your code

 

Thanks jammie, very nice.

 

My best regards

 

Tharwat

[alanjt]

Why not just draw an LWPolyline with a width, rather than a closed one with hatch?

 

Quick and dumb example...

 

(defun c:TEst (/ p1 p2)
 (if (and (setq p1 (getpoint "\nSpecify first point: "))
          (setq p2 (getpoint p1 "\nSpecify next point: "))
     )
   (progn
     (command "_.pline" "_non" p1 "_w" 0. (/ (distance p1 p2) 3.) "_non" p2 "")
     (setvar 'plinewid 0.)
   )
 )
 (princ)
)

[Tharwat]

Why not just draw an LWPolyline with a width, rather than a closed one with hatch?

 

I have thought of that once before, but I wanted to hit tow birds with one shout.:wink:

 

First, to know the principle of following the direction of the GETPOINT for my future routines.

Second, my drawings are in different scales, so the LWPolyline needs to specify the second width of it manually.

 

Tharwat

[alanjt]

I have thought of that once before, but I wanted to hit tow birds with one shout.:wink:

 

First, to know the principle of following the direction of the GETPOINT for my future routines.

Second, my drawings are in different scales, so the LWPolyline needs to specify the second width of it manually.

 

Tharwat

OK. I just followed similar principals to your above routine.

[Tharwat]

Why not just draw an LWPolyline with a width, rather than a closed one with hatch?

 

Quick and dumb example...

 

(defun c:TEst (/ p1 p2)
 (if (and (setq p1 (getpoint "\nSpecify first point: "))
          (setq p2 (getpoint p1 "\nSpecify next point: "))
     )
   (progn
     (command "_.pline" "_non" p1 "_w" 0. (/ (distance p1 p2) 3.) "_non" p2 "")
     (setvar 'plinewid 0.)
   )
 )
 (princ)
)

HA HA

I believe that your codes were not posted from the first time. when I wrote my last reply.

 

Right..... ?

[alanjt]

HA HA

I believe that your codes were not posted from the first time. when I wrote my last reply.

 

Right..... ?

COrrect.......

[alanjt]

BTW, you should post your completed/fixed routine for completeness and it might help someone else down the line.:wink:

[Tharwat]

Here it goes with no hesitation at all to all my dear members ....... enjoy it.

(defun c:arrow (/ p1 p2 dist vrt pickangle p3 p4 old new)
(setq p1 (getpoint	"\nSpecify Start point of Arrow:")
     p2 (getpoint p1 	"\nSpecify End point of Arrow:")
     dist (distance p1 p2)
     vrt (/ dist 3)
     pickAngle (angle p1 p2)
    p3 (polar p2 (+ pickAngle (/ pi 2)) vrt)
    p4 (polar p2 (- pickAngle (/ pi 2)) vrt))
(setq old (getvar 'osmode)
     new (setvar 'osmode 0))
(vl-cmdf "_.pline" p1 "_w" 0 0 p3 p4 "_c" )
(vl-cmdf "_.-hatch" "_s" (entlast) "" "_p" "_solid" "" "")
(setvar 'osmode old)
 (princ))

 

Tharwat

[alanjt]

See revisions...

 

(defun c:arrow (/ p1 Len Alen p2 p3)
 (if (and (setq p1 (getpoint "\nSpecify Start point of Arrow:"))
          (setq p2 (getpoint p1 "\nSpecify End point of Arrow:"))
     )
   (progn
     (setq dist      (distance p1 p2)
           vrt       (/ dist 3)
           pickAngle (angle p1 p2)
           p3        (polar p2 (+ pickAngle (/ pi 2)) vrt)
           p4        (polar p2 (- pickAngle (/ pi 2)) vrt)
     )
     (vl-cmdf "_.pline" "_non" p1 "_w" 0 0 "_non" p3 "_non" p4 "_c")
     (vl-cmdf "_.-hatch" "_s" (entlast) "" "_p" "_solid" "")
   )
 )
 (princ)
)

[Tharwat]

Really strong and faster. certainlly.

No comments .

 

And what's made it that strong in implementing the routine ?

Is it the IF function ?

 

 

Thanks

[alanjt]

Really strong and faster. certainlly.

No comments .

 

And what's made it that strong in implementing the routine ?

Is it the IF function ?

 

 

Thanks

 

See notes...

 

(defun c:arrow (/ p1 Len Alen p2 p3)
 (if (and (setq p1 (getpoint "\nSpecify Start point of Arrow:")) ; notice these are broken up to avoid error if the first is not defined, etc.
          (setq p2 (getpoint p1 "\nSpecify End point of Arrow:")) ; only if these two variables are filled, will the routine continue
     )
   (progn
     (setq dist      (distance p1 p2)
           vrt       (/ dist 3)
           pickAngle (angle p1 p2)
           p3        (polar p2 (+ pickAngle (/ pi 2)) vrt)
           p4        (polar p2 (- pickAngle (/ pi 2)) vrt)
     )
     (vl-cmdf "_.pline" "_non" p1 "_w" 0 0 "_non" p3 "_non" p4 "_c") ; if you add "_non" before defining a point in any command, it will ignore any running OSnaps. Thus, you don't have to worry with osmode
     (vl-cmdf "_.-hatch" "_s" (entlast) "" "_p" "_solid" "")
   )
 )
 (princ)
)

[Tharwat]

I am Speechless.

you did convinced me well.

 

Thanks Alan

 

My best regards

 

Tharwat

[jammie]

Thank you jammie, That's really helpful.

Your welcome Michaels, glad you found it helpful

[jammie]

Thanks jammie, very nice.

 

My best regards

 

Tharwat

 

No problem, your welcome tharwat313

[alanjt]

I am Speechless.

you did convinced me well.

 

Thanks Alan

 

My best regards

 

Tharwat

Enjoy. ......