AutoCAD Visual LISP / AutoLISP :: Distance Between Two Points Along The Path Of Polyline
Sep 10, 2012
There are times that I have a really long curb polyline that has both line and arc segments. I wish to pick two points along that polyline and have it give me the distance between those two points along the path of the polyline.
Do we have this ability natively? Have I been missing something all this time? Normally I have to make a copy of the original entity, ... break, break, list erase or undo....
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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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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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Sep 18, 2013
I need a lisp that creates a polygon of N points, so to enter a only the distance between these points, after choosing N points in the drawing for approximately creating polygons.
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Feb 21, 2013
I would like to eliminate a mouse click in my program. I use getstring to allow the user to either enter in an integer or a distance used for labeling in a drawing, but I could eliminate the need for the user to then click an option that completes the label if I only knew how to determine if the entry is an integer (such as 5 or 15) or a distance (such as 24" or 36").
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Dec 30, 2011
I am using the following routine definition then calling the different view poins from a pop up menu.
Each time I switch veiw points it drastically zooms out. I would like to maintain the "zoom distance" if there is such a thing when switching views.
Ideally, like when in 3dorbit, I would like it to swing views around similar to that but to the defined viewpoints as below....
(DEFUN V (inp) (setq inp (strcase inp))
(cond ((= inp "T") (SETQ IXY 270) (SETQ FXY 90)) ((= INP "F") (SETQ IXY 270) (SETQ FXY 0)) ((= INP "RE") (SETQ IXY 90) (SETQ FXY 0)) ((= INP "L") (SETQ IXY 180) (SETQ FXY 0)) ((= INP "RI") (SETQ IXY 0) (SETQ FXY 0)) ((= INP "URI") (SETQ IXY 0) (SETQ FXY 45)) ((= INP "UL") (SETQ IXY 180) (SETQ FXY 45)) ((= INP "UF") (SETQ IXY 270) (SETQ FXY 45)) ((= INP "URE") (SETQ IXY 90) (SETQ FXY 45)) ((= INP "URF") (SETQ IXY 315) (SETQ FXY 35)) ((= INP "URR") (SETQ IXY 45) (SETQ FXY 35)) ((= INP "ULF") (SETQ IXY 225) (SETQ FXY 35)) ((= INP "ULR") (SETQ IXY 135) (SETQ FXY 35)) );COND (COMMAND "VPOINT" "R" IXY FXY) );END V.LSP
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Aug 8, 2013
Let's say I have a 3D polyline, which I turn into a spline. I then want to determine how closely the original polyline and spline follow each other. How I can check this programmatically? The concern is to find the maximum deviation and its location.
Howto be able to run the check on other types of objects as well: arc, polylines etc.
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Dec 28, 2013
I would like to write some sort of AutoLISP program to evenly space objects across a given distance. I have attached a .pdf file showing what exactly I mean.
I would like the program to enable me to either enter or measure (via the selection of two points) the "z" distance, to enter or measure the "y" distance, and to enter the number of objects, "n". I would then like the program to evenly space "n" objects across the "z" distance.
A program like this is, I have to be honest and say, way beyond my current capabilities.
Perhaps some initial guidance to get me going?
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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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Jan 9, 2014
I have double line pipe drawings but i have to change distances between of this lines in entire drawing and i was thinking that maybe there is a lisp code which can create new double line according to my specify dimensions ...
example :
Distance between lines : 100 mm
------------------------
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here is what i want to do :
1. select double line
2. specify new distance ( for example 200 mm)
3. lisp will create center line middle of the selected lines ( maybe it can ask me that this center line will be permanently or not )
4. lisp will create new double line from this centerline according to my specific distance
5. new double line layers will be the same with selected old double line
and this lisp has to work for double arc or quarter circles too.
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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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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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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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Jan 5, 2012
I have a drawing that has 2D pipeline (only x and y, z value =0) and 3 topo contour lines ( with x, y and z vaules). I need to divide the the 2D pipeline into say 2000 points and then get the corresponding z values from the topo contour lines. I think it can be done by interpolating between the z values for the two apparent intersection points of the 2D line and the contour lines, the x and y values will be the same for the points that falls between these two aparent intersections. Is there any lisp out there that can do that.
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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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Jun 28, 2013
I continue learning....
(setq ins (vlax-ename->vla-object ( ssname sele cod)) nombre (vla-get-name ins) ) (setq bloque1 (vla-item (vla-get-Blocks (vla-get-Document ins) ) nombre ) ) (setq s_ent1 (vla-item bloque1 1)) (setq pt1 (vla-get-startpoint s_ent1 ))(setq pt2 (vla-get-endpoint s_ent11 ))(setq s_ent2 (vla-item bloque1 2)) (setq pt3 (vla-get-startpoint s_ent2 ))(setq pt4 (vla-get-endpoint s_ent2 ))(command "_pline" pt1 pt2 pt3 pt4 "c")
Why dont draw de _pline?
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Jul 5, 2012
I have many drawings with blocks containing polylines set with property Fit/Smooth = cubic. For conversion purposes, I need to change them to FIt/Smooth = none. It is easy with the Properties palette but, because I have lots of drawings to fix, I want to write a lisp routine. Any VLA-SET-xxx property that will allow me to do it in lisp?
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