vla-get-Perimeter...

Do I need to make a dummy region to use <vla-get-Perimeter> for a polyline
(lwpolyline) perimeter calculation? When I use (vla-get-Perimeter <some vlax
object polyline>) it returns an error. However If I make a region based on
my polyline (lwpolyline) object the vla-get-Perimeter function works fine.
Is there any direct way of getting polyline perimeter? I can calculate all
vertexes' length separately including arches. Is this the only choose I
have?

 

For polylines use vla-get-Length

Tim

 

Plines don't have a 'length' property....
Assuming you've got your pline as a VLA-OBJECT stored as 'ent':
(setq endp (vlax-curve-getendparam ent)
dist (vlax-curve-getdistatparam ent endp))

 

Select entity: ; IAcadLWPolyline: AutoCAD Lightweight Polyline Interface
; Property values:
; Application (RO) = #<VLA-OBJECT IAcadApplication 00b60584>
; Area (RO) = 1.89803
; Closed = -1
; ConstantWidth = 0.0
; Coordinate = ...Indexed contents not shown...
; Coordinates = (-12.8824 8.76075 -14.4679 8.76075 -14.4679 7.56362 ... )
; Document (RO) = #<VLA-OBJECT IAcadDocument 0106b690>
; Elevation = 0.0
; Handle (RO) = "9A"
; HasExtensionDictionary (RO) = 0
; Hyperlinks (RO) = #<VLA-OBJECT IAcadHyperlinks 2ae140c4>
; Layer = "AN_NOTE"
; Length (RO) = 5.56521 <---------------------
; Linetype = "ByLayer"
; LinetypeGeneration = 0
; LinetypeScale = 1.0
; Lineweight = -1
; Normal = (-1.22461e-016 5.43834e-032 -1.0)
; ObjectID (RO) = 2130456848
; ObjectName (RO) = "AcDbPolyline"
; OwnerID (RO) = 2130103560
; PlotStyleName = "ByLayer"

Tim

 

OK, let me ephrase that...MY version of Acad (2002) does not have the length
property on anything but a Line object.......

 

I believe they added that length property
in AutoCAD 2004

 

Hi 3ABTPA

In addition to Jeff's answer I would propose to use always the vlax-curve-*
stuff. In opposite to the 'Length', 'ArcLength', etc. properties you can
get the length from *Polylines, Splines, Lines, Arcs, Circles and Ellipses
with the same function.
Note:
Don't forget to initialize the ActiveX interface by (vl-load-com).

Cheers

 

Thank guys,