AutoCAD Visual LISP / AutoLISP :: Feature And Polyline Flow Direction (another One)
Nov 18, 2012
I have a linetype
*DIVERSION_LARGE,diversion large ---- >> ---- >> ---- >> ----
A,.5,-.2,["<<",standard,S=.15,r=0,U=0.0,X=-0.1,Y=-.05],-.2
when I draw a polyline, or use it as the linetype in a feature line style, the arrows seem to revrse whenever there is a change in direction any significance. Also, the reverse command and reversefeature command have no effect. Rotating a segment does not change the direction. I know I must be missing something.
In the attached, I have a feature line, and a polyline that the arrows change direction when the feature does.
Windows 7 64
Intel Core i7 2.0 GHz 2.0 GHz
8 GB RAM
Nvidia GeForce GTX460M
Civil 3D 2012 SP2.1
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.
Now, in my understanding, the flow arrow should either be rotated 0, or 180 (pi radians). But clearly, some of them like to have their own mind about things, and decide on some other rotation. It seems that on the steep slopes, the arrows go a bit skew.
I think the skew is related to the actual elevation difference of the segment, rather than the steepness of the slope. A long segment with 15% slope has a worse skew than a short segment at over 30%, presumably because the elevation difference from the start to the end of the segment is larger.
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.
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.
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.
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
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?
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
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.
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?
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.
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.
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?
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?
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].......
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?
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?
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?
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?
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....
I would like to select a polyline that will either be straight or contain bulges and offset lines either side of it a prescribed amount, I have tried a couple of options that don't involve picking points on both sides to no avail.
I have drawings with a lot of polyline objects. I need a routine which will draw multilines by coordinates of vertexes of this polylines. For example, if there is a pline with coordinates 10,10 - 20,20 i want to draw in other layer MLINE with the same coordinates. I know it's should be simple but can not gues how to do it. I've never used LISP before.
