How can I get this result?
The aim is to stroke one single polyline and get two thin lines and thicker dashed line at the center.
My closest attempt has been to s construct a multiline with its lines in different layers (different weights), however the weight of the central line is dependant on the scale of the viewport, consequently its width is smaller or larger than the two thin lines in each presentation that it appears in.
Any clues?
Thanks!
I would be tempted to create a line type.
Another method to consider would be to use somthing like lee macs multi-polyline lisp http://www.lee-mac.com/mpline.html and then change the middle line width after creating it. (PEDIT and change width)
To create the line use the MKSHAPE command and the MKLTYPE command (Requires express tools - no LT)
Below is a screencast where i created another line type but the method should be about the same.
22d47664-ad08-430a-a8da-b3cd55d906a5
CADnoob
@TheCADnoob wrote:
I would be tempted to create a line type.
....
22d47664-ad08-430a-a8da-b3cd55d906a5
If you choose that two-shapes approach in a linetype, you can greatly reduce the jiggity effect at curves by using the approach >here< [that's about embedded Text, but the principle is the same for other shapes].
@adriaGMU8Z wrote:
... I am currently drawing it using 3 manually offseted lines the side lines being a regular polyline and the central line being a dashed multiline, i set the thickness of this central line using the properties dashboard. The visual output is very good however it is a bit tedious.
The tedium can be reduced, with something like this [untested]:
(defun C:TEST (/ thk pl plobj)
(setq thk (getdist "\nDrawn thickness of waterproofing membrane: "))
(setvar 'plinewid 0)
(prompt "\nDraw center-line path of membrane section.")
(command-s "_.pline")
(setq pl (entlast) plobj (vlax-ename->vla-object pl))
(vla-offset plobj (/ thk 2))
(vla-offset plobj (/ thk -2))
(command "_.chprop" pl "" "_ltype" "dashed" "")
;; [does not require the linetype to be already loaded]
(entmod (append (entget pl) (list (cons 43 thk)))); middle-one width
(princ)
)That is in simplest terms. It could be enhanced, for instance to save your membrane thickness and offer it as default, to save the current PLINEWID System Variable value [in case it's not 0] and restore it afterwards, etc.
If you want to first draw one of the edges rather than the middle, that can be done, though it will require a User pick of the side to which to OFFSET the initial Polyline.
