Negative Polylines
I have been using this code fragment in AutoCAD 2002:
(command "PLINE" P2 "W" "0" "0" P1 "W" "0" (* 0.0625 SC) "L" (- 0.0 (* 0.1875 SC)) "")
When I try to use it in Bricscad, I get an error message the the line segment has to be positive. Why can't polyline lengths be negative?
Comments
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This code snippet is what I use to draw lines with arrow heads. This is from the begionning of AutoCad when leader was buggy. I just kept using it through various upgrades. The problem is this item: "L" (- 0.0 (* 0.1875 SC)) . BC throws out an error about the line segment must be positive. Is this coded into BC or is there a work-around so that I don't have to revise my lisp routines to calculate a 3rd point to keep the pline positive?
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In 10.2.14 When I establish p1, p2 and sc then paste the code on the command line, it draws a pline tapering from 0 to some width then lets you continue drawing the thickened pline anywhere you want. No error message. Is that how it's supposed to work?
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Solution: use "follow" ("F") instead of "length" ("L"). Follow will accept negative values.
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"F" works. The code nows runs correctly. Thank you.
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