Topic: Routine doesnt select Open Polylines

[mailmaverick]

I have a LISP routine which selects only Open (cons 70 0) polylines and uses them for further work.

I've been using it for quite a few months without a problem but just now I came across a file having open polylines but having (cons 70 128). When I read about the same, I came to know that it means 'Linetype Generation Enabled.'

My question is : whether I should change the selection set command from :-

Code: [Select]

(setq sspipes (ssget "_:L" '((0 . "*POLYLINE") (70 . 0))))
to

Code: [Select]

(setq sspipes (ssget "_:L" '( (0 . "*POLYLINE") (-4 . "<OR") (70 . 0) (70 . 128) (-4 . "OR>"))))
or is there any other better way of doing this ?

[didier]

Coucou

I do not understand why you're talking about open polylines !
":L" rejects entities on locked layers.

amicalement

[mailmaverick]

My polylines are in a layer which is not locked and are also 'Not Closed'.

[kdub_nz]

Coucou

I do not understand why you're talking about open polylines !
":L" rejects entities on locked layers.

amicalement

He means NOT closed .. ie:

[gile]

Hi,

You should have a look at the bitwise AND operator (-4 . "&")

Code - Auto/Visual Lisp: [Select]

1. (setq sspipes (ssget "_:L" '( (0 . "*POLYLINE") (-4 . "<NOT") (-4 . "&") (70 . 113) (-4 . "NOT>"))))

should reject :
64 POLYLINE is a polyface mesh
32 POLYLINE is a polygon mesh closed in the N direction
16 POLYLINE is a 3D polygon mesh
1 (LW)POLYLINE is closed

[mailmaverick]

Dear Gile

Thanks for your reply. How to decide which is better to use :-
(setq sspipes (ssget "_:L" '( (0 . "*POLYLINE") (-4 . "<NOT") (-4 . "&") (70 . 113) (-4 . "NOT>"))))
or
(setq sspipes (ssget "_:L" '( (0 . "*POLYLINE") (-4 . "<OR") (70 . 0) (70 . 128) (-4 . "OR>"))))

[ronjonp]

Dear Gile

Thanks for your reply. How to decide which is better to use :-
(setq sspipes (ssget "_:L" '( (0 . "*POLYLINE") (-4 . "<NOT") (-4 . "&") (70 . 113) (-4 . "NOT>"))))
or
(setq sspipes (ssget "_:L" '( (0 . "*POLYLINE") (-4 . "<OR") (70 . 0) (70 . 128) (-4 . "OR>"))))

Try using the second on a "heavy" AcDb2dPolyline ..

[mailmaverick]

Thanks everyone.

[gile]

Hi,

Using the "&" opertaor gives you more control:

Code - Auto/Visual Lisp: [Select]

1. '((0 . "*POLYLINE")
2.   (-4 . "<NOT")
3.   (-4 . "&")
4.   (70 . 113)    ; (+ 1 16 32 64)
5.   (-4 . "NOT>")
6. ))

is equivalent to:

Code - Auto/Visual Lisp: [Select]

1. '((0 . "*POLYLINE")
2.   (-4 . "<OR")
3.   (70 . 0)     ; lwpolyline or simple 2d polyline
4.   (70 . 2)     ; curve-fit 2d polyline
5.   (70 . 4)     ; spline-fit 2d polyline
6.   (70 . 8)     ; 3d polyline
7.   (70 . 12)    ; spline-fit 3d polyline
8.   (70 . 128)   ; linetype generation enabled lwpolyline or simple 2d polyline
9.   (70 . 130)   ; linetype generation enabled curve-fit 2d polyline
10.   (70 . 132)   ; linetype generation enabled spline-fit 2d polyline
11.   (70 . 136)   ; linetype generation enabled 3d polyline
12.   (70 . 140)   ; linetype generation enabled spline-fit 3d polyline
13.   (-4 . "OR>")
14. )

The equivalent of:

Code - Auto/Visual Lisp: [Select]

1. ((0 . "*POLYLINE")
2.   (-4 . "<OR")
3.   (70 . 0)     ; lwpolyline or simple 2d polyline
4.   (70 . 128)   ; linetype generation enabled lwpolyline or simple 2d polyline
5.   (-4 . "OR>")
6. )

should be:

Code - Auto/Visual Lisp: [Select]

1. '((0 . "*POLYLINE")
2.   (-4 . "<NOT")
3.   (-4 . "&")
4.   (70 . 127)  ; (+ 1 2 4 8 16 32 64)
5.   (-4 . "NOT>")
6. )