Polylines and Blocks by Kenny Ramage Polylines and Blocks! Come back Don't run away Honestly, they are a lot easier to deal with than you think. I know that they are called 'complex entities', but the only difference between them and other entities is that we just have to dig a bit deeper to get to what we want. In fact, once we get there I'll show you a couple of things that you swear is magic. So bear with me, take your time, and hang on for a ride on the magic carpet Polylines The LwPolyline (Light Weight Polyline) entity, or 'optimized polyline,' was introduced with Release 14. A lwpolyline is defined in the drawing database as a single graphic entity.
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You can convert all, or a selection of, the closed polylines in an existing drawing to polygon objects. When you convert a closed polyline, the original polyline is.
This is different than a standard polyline, which is defined as a group of subentities. Lwpolylines display faster and consume less disk space and RAM.
In Release 14 and above, 3D polylines are always created as standard polyline entities. 2D polylines are created as lwpolyline entities by default unless they have been curved or fitted with the PEDIT command. When a drawing from a previous release is opened in Release 14 and above, all 2D polylines convert to lwpolylines automatically unless they have been curved or fitted or contain xdata. We will have a look at the R13 and below Polyline first. To start, draw 3 joined polylines.
(3DPoly if you are using R14 and above). Then type this: Command: (setq e (entget (car (entsel)))) AutoLisp should return something like this: Select object: ((-1. 'POLYLINE') (5. 'AcDbEntity') (67. 'AcDb3dPolyline') (66.
1) (10 0.0 0.0 0.0) (70. 0.0) (210 0.0 0.0 1.0) (71. 0)) Hey, wait a minute! AutoLisp has returned the entity list, and I can see that it's a Polyline, but there are no co-ordinates, and where does AutoLisp get the co-ordinates for all the vertices? As I said earlier, we need to dig a little bit deeper to get the information we require.
This is where the (entnext) function comes into play. Now type the following 5 code segments: Command: (setq e1 (entget (entnext (cdr (car e))))) ((-1. 'VERTEX') (5. 'AcDbEntity') (67. 'AcDbVertex') (100. 'AcDb3dPolylineVertex') (10 391.774 521.633 0.0) (40.
0)) Command: (setq e2 (entget (entnext (cdr (car e1))))) ((-1. 'VERTEX') (5. 'AcDbEntity') (67.
'AcDbVertex') (100. 'AcDb3dPolylineVertex') (10 758.971 383.418 0.0) (40.
0)) Command: (setq e3 (entget (entnext (cdr (car e2))))) ((-1. 'VERTEX') (5. 'AcDbEntity') (67.
'AcDbVertex') (100. 'AcDb3dPolylineVertex') (10 257.549 377.344 0.0) (40. 0)) Command: (setq e4 (entget (entnext (cdr (car e3))))) ((-1. 'VERTEX') (5. 'AcDbEntity') (67. 'AcDbVertex') (100. 'AcDb3dPolylineVertex') (10 391.774 521.633 0.0) (40.
0)) Command: (setq e5 (entget (entnext (cdr (car e4))))) ((-1. 'SEQEND') (5. 'AcDbEntity') (67. )) The (cdr (car e)) returns the entity name of entity list e.
Each code segment then uses the (entnext entity name) of the entity that precedes it. Take note of the entity type of each variable: e(0. 'POLYLINE') e1(0. 'VERTEX') e2(0. 'VERTEX') e3(0.
Autocad Polyline Settings
'VERTEX') e4(0. 'VERTEX') e5(0. 'SEQEND') Do you see that a 3 line Polyline consists of a master or, parent list, 4 vertex and an end-of sequence ( 'SEQEND') list.
To extract the entitity list for each vertex is therefore, quite easy. We just need to loop through the sequence of vertices until we reach the SEQEND list.
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