AutoCAD .NET :: Principal Moments Of A Region (or Closed Polyline)?
Aug 29, 2013
I'm trying to calculate the principal moments (and section modulus) of a slection of closed polylines.
On this blog, I read that there are some new classes and functions in the AutoCad 2014 objectARX that can do this.
The one that interests me the most is 'RegionAreaProperties.PrincipalMoments Property'.
However with my limited programming skills, I can't get it to work in vb.net.
I thought is was just a property of a region, but something like 'myregion.RegionAreaProperties.PrincipalMoments' does not work.
With the code I already have I use a selectionfilter to select multiple closed polylines. I can convert these to regions if nescesary. But what is the next step? I can't find any samples of it. Not even in the Autodesk Developer's Guide.
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May 13, 2011
I cant do booleans with polylines, for that I need to convert them to regions which I dislike because I lose edit vertex capabilities right? Also, from a region, how can I convert a region to a closed polyline in one go.
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Oct 9, 2013
I'm trying to look for a LISP command where i will create a closed polyline with 4 sides in different angles. then convert it to region.
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Apr 10, 2012
I have used PEDIT to join multiple polylines, which now appear as polylines. But when I use QSELECT to show all open (non-closed) section, one polyline still shows up as open.
I've attached the file I'm working on. The polyline in question is the green outline on the object on the right.
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Oct 29, 2013
I want to have a closed region that can display the area of the region (I want to see it on the screen without having to click on the area and look in the properties). Is this possible?
I want the closed region to be dynamic i.e. when I change the area of the region the displayed area should automatically change. Is this possible?
Even better would be if autocad could give the area a id and in a table that can be exported to excel reports the area of the region. Then if I have many regions autocad give every region a new id and all the id:s and areas are reported in the same table.
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Feb 17, 2009
For the sake of editing, I sometimes make LWPOLYLINES and convert them to regions so that I can union and subtract and intersect, etc.
then sometimes, like now, I want to work with them like as LWPOLYLINES again.
is there some command I don't know, or some routine or shall I make one?
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Jul 3, 2012
Is there a methoed or trick to realize a polyline is closed or not?
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Aug 7, 2013
I have closed polyline:
Polyline rectangle = new Polyline();rectangle.AddVertexAt(0, rectangleTopLeft, 0, 0, 0);rectangle.AddVertexAt(0, rectangleBottomLeft, 0, 0, 0);rectangle. AddVertexAt(0, rectangleBottomRight, 0, 0, 0); rectangle.AddVertexAt(0, rectangleTopRight, 0, 0, 0); rectangle.Closed = true;
How can I make it like a hatch(to fill it up)?
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May 16, 2013
Is there a command or lisp that will allow you to select a closed polyline and trim everything outside of it even if the items are blocks that aren’t exploded?
I’ve tried EXTRIM but that fails on blocks.
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Mar 2, 2010
When I try to extrude this closed polyline (yes it is closed) I get the message "Cannot sweep or extrude a self-intersecting curve." I do this sort of extrusion all the time (closed polylines with various geometry) and usually have no trouble.
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Aug 3, 2011
I've been using the admittedly pieced together code in order to insert border blocks around a closed polyline. Yhe problem I'm having is that when the Block angle is say "zero" the block is inserted the same way both on top and below the polyline. Since the blocks surround the polyline the blocks on the downside should have an additional 180 degree rotation. How to deduct that the portion of the polyline is in a certain quadrant and adjust the insertion angle as necc? I 'm not sure thats even the best approach.
Dim pso As PromptStringOptions = New PromptStringOptions("Enter name of block to create reference: ")
Dim pr As PromptResult = myEd.GetString(pso)
Dim blkName As String = pr.StringResult
'If (!bt.Has(blkName)) Then
[Code] ....
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Aug 13, 2013
I have a method for inserting a vertex to a polyline. But this does not work for closed polylines for the case shown below. The code fails if the point is on the last edge of the polyline.
public void AddVertexOnPolyline(Point3d addPoint,Polyline editPolyline) { Document acDoc = Autodesk.AutoCAD.ApplicationServices.Core.Application.DocumentManager.MdiActiveDocu
[Code].....
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May 23, 2011
Is there a way to select objects within a closed polyline? I thought there was but I can't remember how to do it.
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Oct 31, 2013
Presently the "AREA" of a closed polyline is in "sq-in" first, THEN "sq ft".
For everything I do, and likely others, I need sq ft - without having to waste time and roll my cursor over the results.
Is there ANY way to change this default to have sq ft FIRST!??
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Jul 17, 2013
I was wondering if there is a settings for the displayed values in a polyline's properties. Such as area. Normally it will display square feet but I would like for it to also display acres. I know it a simple conversion, but over the course of a year or more it could save me alot of time.
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Mar 14, 2012
I need a lisp that can remove all objects (lines, polylines, blocks etc.) outside of a polyline. polyline is closed and shape is variable, so not rectangle.
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Jul 6, 2012
I am trying to find a command that will hatch the inner edge of a complex closed poly line, rather than hatch the entire area inside the poly line.
When I have simple shapes such as a rectangle I create a smaller rectangle inside the first that is 1' (or whatever I want my hatched area to be) smaller on all sides than the first rectangle. I hatch by selecting the two rectangles; I change the "Associative" hatch property to "No" and then delete the inner rectangle.
My problem now is that I have a complex closed poly line that I would like to hatch the inner perimeter with a set thickness, say 1 foot. Is there an easy way to hatch a inner boundary of a closed poly line or to recreate a scaled down copy of the poly line that is a set distance smaller all around. I hope I have conveyed the question clearly enough.
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Oct 10, 2012
I can draw a closed polyline representing a closed area.
I can then toggle its 'closed' property and it seems to make no difference. area is same, I can extrude or create regions, I can hatch in either case.
in which specific situations we should bother about whether a polyline is closed or not?
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Jun 20, 2013
I want to find the cardinal points ( N, S, E, W) of each face of a closed polyline, how?
Windows 7 (x64)
AutoCAD 2012 (x64)
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May 23, 2012
I have linked my drawing to a database with text inside a closed polyline. Is there a way to have the area of the closed polyline stored in the database as a live area.
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May 14, 2009
I drew a very complicated 2-D plot this afternoon. The most majority of the plot is composed of different straight lines, arcs. Then I used the polyline function to join them together to form a closed single polyline (Modify->object->polyline).
Later on I want to change something in part of the polyline. Then I used the 'pedit' again, I chose 'open'. But the whole polyline won't break into its original segments. I tried through all the menus, just cannot find the right tool for this purpose.
Does it mean I have to start over from scratch to redraw the whole plot?
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Mar 8, 2012
I am a landscape architect, and am trying to use bushy linetypes to delineate blobs of mass plantings. I created my custom line types, and tweaked them to the point where they look the way i want, but whenever i have a curve the line type faces in not outside the closed polyline. all of my shapes are closed poly lines, and i need the linetype to face out other wise it looks weird. I am attaching a picture the strait line to the right is the way that it is supposed to look, but in the circle you can see how the points are all facing in to the middle of the circle? reversing the direction dose nothing, and using a or u in the place of r in the linetype shape code doesn't work either below is the line types code and image.
*Curveypines, Curvey zigzag
A,.0001,-0.0,[a,curvya.shx,s=.01,r=0.0,x=0,y=0],-.25,[b,curvyb.shx,s=.01,r=0.0,x=0,y=0],-0.0,[a,curvya.shx,s=.015,r=0.0,x=0,y=0],-.355,[b,curvyb.shx,s=.015,r=0.0,x=0,y=0],-0.0
Screen shot 2012-03-07 at 4.30.48 PM.jpg
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Aug 22, 2011
Im wondering if exist any lisp, for erasing or selecting elements inside multiple closed polyline.
So if i have 34 closed polyline in drawing, and i wont to be erased everything inside those polyline?.
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Nov 20, 2008
I'm trying to model a 3d leadscrew. How can I extrude a 2d closed polyline in a straight line while at the same time twisting it (360° twist for every 1.5" along the path). I've tried loft, sweep, extrude all using the helix as a path. When I can get a result, it ends up being a corkscrew.
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Dec 11, 2012
I have been using AutoCAD to create product designs (baby bottles) for the last three years. I am normally drawing lines, arcs and splines to create the shape, then I use PEDIT to create a closed polyline and REVOLVE to create a SOLID 3D object from that shape.
Couple days ago, AutoCAD is not longer creating 3D solids when I use REVOLVE as usual (even using older files and/or the same shapes or polylines that I have used before to create 3D solids). The result of REVOLVE is "SURFACE (REVOLVE)" (I got that from properties). But, the most uncommon thing is that AutoCAD is revolving fine one or two times per day after many many tries. (normally I am closing and opening files and trying to revolve some stuff many times, using the same process and suddenly it revolves the sahpe as a 3D solid)
I attached a picture showing two objects created using the same group of lines, splines and acrs. One is a solid 3d object and the other one is a surface (revolve) as result of using REVOLVE command. WHY????
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Oct 9, 2012
I am not able to extrude closed polyline shapes. I get the following message:
Cannot create solid from open curve.
Cannot sweep or extrude non-planar objects.
Unable to extrude the selected object.
Other folks have opened my drawing – some can extrude, some get the same or similar message. I’ve tried re-building the shapes to extrude. It worked with one thing this morning and now it won’t extrude again.
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Mar 30, 2012
I need user to draw a closed ployline. Is it possible to use VBA to code a procedue that the effect looks like the WPolygon of select ?(2 rubber-band lines)
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May 1, 2012
I always get the message after I make a closed boundary polygon, and I know it's a closed boundary, but I know how to fix it. It just bugs me sometimes when the message pops up when I add it as a boundary under the definition of a surface.
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Mar 29, 2012
I've read 2013 is going to include line labeling capabilities by selecting 2 points rather than selecting linework. Is there going to be a way to label an area without creating a closed polyline or parcel, where it works the way a hatch works. So if I selecting in the middle of multiple individual intersecting lines, it labels the area.
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Oct 19, 2011
Is there a routine that I could use to count the blocks that are in a closed polyline? The blocks may have or not one or more attributes.
In a previous session I saw a routine which was counting the blocks which had attributes in them, but it doesn't really work, because some of the blocks dont have attributes.
Also is there a routine that counts the different texts that are in the same polyline?
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Mar 8, 2013
Is there a command or a lisp that will automatically dimension each side of a closed polyline at once? See attachment for image.
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