Free Autocad 3d Polyline To Lwpolyline Programs

Notice that G3 is not 1 vertex, it's 4 vertices on the same point. It requires extra code to handle that (which I didn't do).Try my code on my attached dwg, it does more or less what you want. It needs some more work, really.(polyline edit the lines, and joint them to a polyline. Notice that G3 is not 1 vertex, it's 4 vertices on the same point. It requires extra code to handle that (which I didn't do).Try my code on my attached dwg, it does more or less what you want. It needs some more work, really.(polyline edit the lines, and joint them to a polyline.

Lightweight Polylines 1 Jul, 1999 By:Applications developed before AutoCAD R14 sometimes stumble when they encounterthe new objects of Release 14 and later. The most common problem stems from thechange in the polyline object inside AutoCAD. AutoCAD R14 introduced a new objectnamed a lightweight polyline that replaces the complex polyline object. When youcreate a drawing in Release 14 and use commands to create polylines, then you aremost likely creating lightweight polylines. From an AutoCAD user's perspective,the lightweight polyline is exactly like the older polyline. But from aprogrammer's perspective, they are very different.

This month, we'll look atthese differences from a programmer's point of view-both in AutoLISP and in VBA.Let's start with an explanation of exactly what a lightweight polyline is versusa traditional polyline. The primary difference is that a lightweight polyline isaddressed as a single entity object whereas the traditional polyline is asequence of entity objects. In a traditional polyline, you find a series ofvertex objects that define the attributes of each point. Each vertex has its ownentity ID and a full complement of information about that object. In mostpolylines, the information contained in each vertex is redundant. For example,the layer and linetype assignments rarely vary (and shouldn't!) between vertices.In fact, about the only information each vertex contains that is unique is the x,y and z points and bulge factor.

Convert 3d Polyline To 2d Autocad 2018

In some cases, the width will vary betweenvertices as well.Thus, a traditional polyline object takes up a lot more space than it might needin the majority of instances where polylines are used in AutoCAD drawings. Thatis where a lightweight polyline comes into play. A lightweight polyline containsonly the point, bulge and width information for each vertex. And, it is allcontained in a single entity. A lightweight polyline has a repeating set of groupcodes for these values at each vertex point.

This is best seen in the examplethat follows. First, draw a simple rectangle.Command: RECTANGSpecify first corner point or Chamfer/Elevation/Fillet/ Thickness/Width: 0,0Specify other corner point: 1,1Next, type in the expression (entget (entlast)) at the command prompt to revealthe contents of the lightweight polyline.Listing 1. Entity List Resulting From (ENTGET (ENTLAST)) After Drawing aRectangle From 0,0 to 1,1((-1. 0.0)(10 0.0 0.0)(40. 0.0)(10 1.0 0.0)(40. 0.0)(10 1.0 1.0)(40.

0.0)(10 0.0 1.0)(40. 0.0)(210 0.0 0.0 1.0))Listing 2.

Convert 3d Polyline To Polyline

The List Points in a Lightweight Polyline;;(defun LWPOLYSHOW (EL)(while (setq EL (member (assoc 10 EL) EL))(print (cdr (assoc 10 EL)))(setq EL (cdr EL))))Listing 3. Get the Nth Vertex From a Lightweight Polyline;;(defun LWPOLYNTH (N EL)(setq EL (member (assoc 10 EL) EL))(while (and EL ( N 0))(setq EL (member (assoc 10 (cdr EL)) EL)N (1- N)))(if (and EL (zerop N))(list(assoc 10 EL)(assoc 40 EL)(assoc 41 EL)(assoc 42 EL))))Listing 4. Convert a Lightweight to a Traditional Polyline;;(defun LWPOLY2POLY (EL / ZV ZT LYR CLR LTY)(if (= (type EL) 'ENAME)(setq EL (entget EL))(if (= (type (car EL)) 'ENAME)(setq EL (entget (car EL)))))(if (= (cdr (assoc 0 EL)) 'LWPOLYLINE')(progn(setq ZV (assoc 38 EL)ZT (assoc 39 EL)CLR (assoc 62 EL)LTY (assoc 6 EL))(if (null ZV) (setq ZV 0.0))(if (null ZT) (setq ZT 0.0))(setq EN (list'(0. 'POLYLINE')(setq LYR (assoc 8 EL))(assoc 210 EL)ZT(list 10 0.0 0.0 (cdr ZV))(assoc 70 EL)))(if CLR (setq EN (append EN (list CLR))))(if LTY (setq EN (append EN (list LTY))))(entmake EN)(setq EN (list'(0.

'VERTEX')LYR'(10 0 0 0)'(40. 0.0)ZT))(if CLR (setq EN (append EN (list CLR))))(if LTY (setq EN (append EN (list LTY))))(while (setq EL (member (assoc 10 EL) EL))(setq EN (subst(append(assoc 10 EL)(list (cdr ZV)))(assoc 10 EN)EN)EN (subst(assoc 42 EL)(assoc 42 EN)EN)EN (subst(assoc 40 EL)(assoc 40 EN)EN)EN (subst(assoc 41 EL)(assoc 41 EN)EN))(entmake EN)(setq EL (cdr EL)))(entmake (list '(0. 'SEQEND') LYR))(entlast))))Listing 5.