AutoCAD Visual LISP / AutoLISP :: Calculate Multiple Polyline Areas?
Mar 6, 2003
I have a drawing which contains about 100 "areas". These areas are closed polylines. I would like to get a total area of all these polylines.
I have tried using AutoCAD 2002's AREA command, but I am only able to select one item at a time, (AREA, Add, Object). This is fine for calculating a few areas. It gives me a running total of each item that I select.
Using the LIST command works OK for a few items, but you still have to wade through all the other information to get the area info for each item.
Is there a way to select crossing ALL the areas that I have, and have it return a total?
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May 4, 2011
Code below, for labeling polyline areas
It works great for what i want, with 2 exceptions the text is to small and the label is not inserted at the centroid of the polyline, rather it is placed outside the polyline.
i am able to increase the text style by adjusting the dimscale before i run the command, however it would be good if the program could do that automatically, i would like the text to be about 300 units high, and for the label to be placed at the centroid of the polyline
(defun C:AT ( / ss i)
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Jun 7, 2012
I would like to take all the vertices out of a multiple-vertices polyline so that it reduces to just its start and end points, can this be done?
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May 16, 2012
I have many floorplans and each room has a polyline around it.
What I'd like to do, is be able to select multiple (or single) polylines and have a dynamic field with the area attached to each polyline placed in the middle (or on a consistent edge, say top left). Preferably with custom units as we use mm for the drawings, but would want the area in m2. Also custom text heights.
I can find a lot of 'put the area in the middle' scripts, but they're either not dynamic or they require a click to place each one - and with over 700 floorplans and over a hundred or more rooms on some, it's not really possible to do each one individually!
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Dec 20, 2011
I have been searching for a way of exporting multiple polyline or spline coordinates to txt file and all I can find is ones that write out as a single continuous list of coordinates with nothing denoting which one is which.
I really need it to be able to export each polyline as a group, and I would also love for it to be able to include the number of points and name of the layer e.g. :
polyline 'number of points' 'layername'
0.0 0.0 0.0
1.0 1.0 0.0
2.0 2.0 0.0
polyline 'number of points' 'layername'
0.0 0.0 0.0
1.0 4.0 0.0
2.0 8.0 0.0
and so on.....
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Sep 21, 2013
Due to modeling purposes, I need to convert a 3D polyline to a spline. What I have been doing is:
- change polyline fit/smooth to cubic from properties
- convert polyline to spline by typing spline -> object
- method -> fit from properties
You can see the original 3D polyline (green) and the resulting spline (magenta) in the attached drawing.When I zoom in and measure the distance between the two entities at different points along them, at some points the perpendicular distance exceeds 5 millimeters, and I want to ensure the deviation remains under 1 millimeter or even less.
I know I can change the knot parameterization of the spline, and this does work at some locations, but the difference increases at others.Why is there a 5.6 mm difference between the spline fit point and 3D polyline vertex, as measure in the attached drawing?
Now, I can go and manually stretch the fit point to coincide with the vertex. Also, I can add fit points between existing ones to drag the spline closer to the original 3D poly.
However, some of my polys are really long, and it is very time-consuming to do this manually while measuring points along the entities to make sure the distance stays small enough.
how to automate this process? For example a lisp that would maybe take the original vertex points, add say maybe 3 (not too many) new ones between them, and then generate a spline while making sure the deviation is less than the set value of 1mm? I am using AutoCAD 2013.
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Apr 10, 2002
I have about 30 profiles with water pipe lines that I need to measure all their vertical angles. since the vetical scale is exaggerated so I can't use the acad angular icon tool bar. Only thing I cant think of is to block each run then import them back in at 1/10 in y direction. How to get this done faster or more direct by any other methods.
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Sep 27, 2013
what I am attempting -
Pick a line
Pick a starting point on the line
Pick a ending point on the line
Pick side to offset
create list of offset points
Create a new line with a offset
I think I could do this using brute force, but would prefer a mathematical solution.
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Jan 1, 2012
the resulting arc-fit pline has each pline segment converted into two arcs, the common radii of which are perpendicular to the original segment (unless direction of curverature changes)
the resulting arcs can be calculated given the angle of the tangents for each segment.
the factors for determining the tangents at vertex N are:
deflection angle at N
deflection angle at N+1 (90° or non-extant = not a factor, 0° or 180° = segment is the tangent)
deflection angle at N-1 (90° or non-extant = not a factor, 0° or 180° = segment is the tangent)
ratio of lengths of segments (N , N+1) and (N , N-1)
I can find the tangents when N±1 = 90° and when the segment lengths are equal but i can't figure out how to compute the tangent if these 3 factors are varied.
I don't want to use (command"._PEDIT" pl "_FIT""") because i need to collect the arc data anyway and at a high frame rate. The data will be used to further compute a spline frame that best fits a quadratic spline to the arcs. That part i know how to do!
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Nov 22, 2011
I´m triyng to do a autolisp routine to calculate the perimeter of a drawing with several entities like arc, polyline, spline, lines and circles.
In the web i found out a autolisp routine that calculate this but it doesnt recognizes circles.
I need that the circles can be recognized, does some one knows how i can do that?
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Oct 17, 2011
Essentially, I'll be creating a sort of Venn diagram. So for the purposes of this exercise, let's assume it's the classic Venn diagram of three intersecting circles. But I need this to work with closed polylines, that may also have arc segments in them.
Anyway, so I have these intersecting areas, and I need to create bounding polylines for each area, and assess the number of overlaps. So, as in a Venn diagram, the areas where only one circle is present can then get shaded one color, areas where two circles are overlapping can get a different color, and the area where all three circles overlap can get a third color.
I'm clearly going to have to be converting the various boundaries to Regions, and performing some Unions. It seems I could grab all objects, convert them to Regions 2 at a time, and compare their Union'ed area to their individual area, to determine if they overlapped at all. With only the 3 cirlces, that would work, but when I have 35 individual polyline areas with arcs, suddenly this method feels like it will break down.
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Mar 4, 2013
I'd like to get areas from all closed loop polygons of my drawing and save them.
From my point of view, the function would be to:
- hatch every polygon of my drawing
- for each hatch do
- extract area and put it in an array with the variables (name of polygon and area).
And then is it possible to save it in a DWG or DXF file in order to reuse these areas by another program ?
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Mar 19, 2013
Generic lisp file that summaries areas of hatches in a table,
I’m wondering if there is a lisp file that can read the boundary of the study area and the hatches and stick there areas in a table as shown in the attached screenshot
The areas of the roads are derived by subtraction the total area of hatches from the area of the study area.
The dwg file is attached
This is very frequent sort of work and takes a lot of time to be constructed. I’m already using fields to perform this kind of work.
Software: AutoCAD 2014, AutoCAD C3D, AutoCAD M3D, Revit
Windows 7 (Ultimate 64 bits),
Firefox 20.0,
Kaspersky 2013.
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Apr 26, 2013
this is a Offset cutting plane line I want it to be all polylines but I can't get the ename of the end points of the polylines dose anyony know how
(defun ccp (/ pt2)
(SETVAR "CMDECHO" 0)
(setvar "angbase" 0)
(setvar "angdir" 0)
(command "polarang" 1)
(setq pt1 (getpoint "
[Code]....
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May 21, 2012
Is it possible to determine the sum of the lengths of all of the polylines on a certain layer? I'm trying to determine the total length of joint sealant on a building's exterior.
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Aug 23, 2012
I am using acad 2010. I have a contour generator that uses 3d polylines to make contours. I get depressions or tops where I don't want them. I need a lisp routine that will allow me to adjust the z value only on any 3d polyline. I need to raise or lower the z value at any vertex and repeat if necessary. I don't need to prompt the user- I am the user.
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Jul 19, 2013
I create contour line in TOPOGRAPH program, and I import these polylines to AUTOCAD. I have to set elevation for each polyline manually, and I waste a lot of time doing that.
So looking for lisp doing that automatically. I mean, invoke the command, set the first elevation and them select the polylines.
e.g. The first elevation is 530. The next polyline that I select is 531 and so on.
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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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Mar 7, 2012
is there a way to draw a polyline and have autocad clip everything outside of that polyline and discard it so that i end up with a smaller drawing. only the information in that polyline, nothing outside of the polyline
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Feb 5, 2013
I've been searching on and off all morning for a lisp routine, without any luck. I'm trying to draw a pline with a pre determined width (5") and be able to draw unlimited line segments then automatically fillet with a pre determined radius (5").
I wrote this generic macro: ^C^CPLINEWID;5;PL;\\;FILLET;R;5;F;P;LAST; to save SOME time but I want unlimited line segments. Can this be modified or would a lisp be the better route to go?
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Aug 1, 2012
do you know command or lisp that will do new pollyline between two polyline on 1/3 or 1/4 space between them.
I need sommething that would be faster,know is use measure on pollilines then i draw between horizontall polylines on verteks or point new pollyline and then divide it on 4 or 3 parts.
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Apr 17, 2012
i.e. one that would apply best fit lines and arcs to a segmented polyline?
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Dec 18, 2011
I have to intersect polylines "POLYLINE" and "LWPOLINE" with a line and get all the angles of all segments of the polyline that are intersected.
To do this I used a loop that monitors all the vertices of each polyline to find the two vertices of the polyline segment that intersects the line. Unfortunately, these polylines have thousands of vertices and the processing done in this way takes too long.
With the vlax-curve-getClosestPointTo I could very quickly find the vertex of the polyline closest to that intersected with the line, but I need to find the other vertex of the polyline segment to determine the angle of this.
Another question: is there a quick function that returns the exact point of intersection of two curves (e.g. A line and a polyline, or a line and a circle?
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Apr 13, 2012
I´m looking for opportunities to can modify a polyline with 4 or more segments in a polyline with arc. I think it´s possible to pick start and end segment first and than all straight segments to will be in arc segments.
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Jul 29, 2013
Creating a ribbon for Partial Customization files in the CUI, and I am trying to setup some buttons for existing polylines for example underground electric and overhead electric. When writing the macro what are some ideas for creating a polyline with the proper linetype for that particular object rather than changing the layer in layer properties dialogue.
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May 8, 2013
I have a closed polyline that i can add the area to via a field in mtext using the options under area. I would like the area to always be rounded down to the nearest square meter. Is the a way to do this via the acfields.fdc file?
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Oct 11, 2011
I have to go through quite a few drawings and extract the attribute vales of the whole drawing and then a subset contained within a couple of polylines.
The whole drawing is Ok as I can use at out or the data extraction, but its the ones contained within a polyline. How do I do that?
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Nov 13, 2013
i need a vlisp program to draw polyline between two blocks.
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Jan 4, 2013
I have run into a little trouble in trying to figure out how to create a arc polyline with entmake. I've put together the following and it works great with command "pline". I just want to know how to do it with entmake.
(defun C:22 ()
(setq P1 (getpoint "
Specify first point: ")
P2 (getpoint P1 "
Specify next point: "))
[code].......
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Mar 19, 2013
I am writing a routine that will place a piece of text at a specified point along a polyline. My problem is to determine the angle for the text. It needs to be the same as the segment of the polyline that it falls on. Just can't get my head around how to get that angle?
I can get a list of the vertex point of the polyline, but how do I determine the segment the point falls on?
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Apr 25, 2012
I have a inserted block with 4 tags for Length, Thickness, Elevation and Width.How can extract attributes tag values and draw a closed polyline + 2 internal lines, parallel to the block?
Block Name: ID_DATA
Tags: LEN, THI, ELE and WID.
Each internal line placed in a third width.
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