Filter to line list angle 90

[wimal 10]

(setq lineset (ssget"C"pt1 pt2  '((0 . "LINE") (8 . "Layer1")))); lines on laye1

How can filter lines in layer1 and angle 90

[Tharwat 14]

Hi,

 

You need to iterate through each line entity name from the selection set then get the start and end coordinates and assign them to variable names 'p1' and 'p2' and the following codes would return T if the angle of line is equal to 90.0 Degs.

 

(vl-some '(lambda (ang)
           (equal ang (* pi 0.5) 1e-4)
         )
        (list (angle p1 p2) (angle p2 p1))
)

 

Good luck.

[wimal 10]

Hi,

 

You need to iterate through each line entity name from the selection set then get the start and end coordinates and assign them to variable names 'p1' and 'p2' and the following codes would return T if the angle of line is equal to 90.0 Degs.

 

(vl-some '(lambda (ang)
           (equal ang (* pi 0.5) 1e-4)
         )
        (list (angle p1 p2) (angle p2 p1))
)

 

Good luck.

 

Thanks Mr. Tharwat.

[Tharwat 14]

Thanks Mr. Tharwat.

 

You're welcome anytime wimal.

[ronjonp 17]

Hi,

 

You need to iterate through each line entity name from the selection set then get the start and end coordinates and assign them to variable names 'p1' and 'p2' and the following codes would return T if the angle of line is equal to 90.0 Degs.

 

(vl-some '(lambda (ang)
           (equal ang (* pi 0.5) 1e-4)
         )
        (list (angle p1 p2) (angle p2 p1))
)

 

Good luck.

 

FWIW .. you could simplify to this:

(eq (rem angle pi) (/ pi 2.))

[Tharwat 14]

FWIW .. you could simplify to this:

(eq (rem angle pi) (/ pi 2.))

 

Nice approach ronjonp.

[ronjonp 17]

Nice approach ronjonp.

Cheers!!

[Lee Mac 19]

Not sure whether OP wants to test for +/- pi/2 or multiples of pi/2, but for the former you could use:

(equal 0 (cos <angle>) 1e-

And for the latter:

(or (equal 0 (cos <angle>) 1e- (equal 1 (cos <angle>) 1e-)