AutoCAD Visual LISP / AutoLISP :: Calculate Tangents For Pline Fit Curve?
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!
I have LWPOLYLINEs that represent a cross section of a train tunnel. Each LWPOLYLINE lists its 2D points in an Object Coordinate System.My task is to create 3D Polylines in WorldCoordinateSystem using those LWPOLYLINEs.I have posted a drawing with sample objects.
I have attached a sample drawing. Drawing was created with Civil 3D 2013, but I exporttoautocadr12dxf'd it and then save to 2004 dwg so most should be able to open it.
Requires numeric distance, two points, or option keyword. ; error: Function cancelled
Enter fuzz distance or [Jointype] <0.000>: j
Enter join type [Extend/Add/Both] <Extend>: *Cancel*
or
Command: ch2pl
Select objects: Specify opposite corner: 5 found
Select objects:
*Invalid selection* Expects a point or Window/Last/Crossing/BOX/ALL/Fence/WPolygon/CPolygon/Multiple]: ; error: Function cancelled Select polyline or [Multiple]: Enter an option [Close/Join/Width/Edit vertex/Fit/Spline/Decurve/Ltype gen/Reverse/Undo]: *Cancel*
I have been using one routine very successfully to create a pline in modelspace that has the outline of the chosen viewports in the drawing. This one works great.
Now I am trying add other routines that I've done to better fit my needs. If I use each routine individually at the command line they work, but when I use all in a single command I got the following errors:
The routine SetColor - does not change color to Bylayer The routine RectWidth - ; error: bad SSGET list
Why?
See the attached file for more details and be free to improve whatever you want in my routines because they are very basic.
And, if I am not asking to much, is that possible to not be prompt to select objects? I mean, the routine could automatically select all viewports in the drawing...
I have been having a few 3dpline's with the last vertex being in a different layer. I saw a site mention that this is an AutoCAD 14 bug that could be caused if a program does not end the pline with the layer being set properly before doing a seqend command. If I move the entity to another layer and then back to the correct one it will fix it. Audit in R14 will not show any errors. If I export the file to AutoCAD 12 , audit will detect and fix the problem. I would like to find a Lisp, ARX, etc. that would check for this problem and fix, change color or layer, or whatever.
Now I have all block instances rounded into a 5mm-accuracy. How to also round in Line start and end points (and maybe even polyline vertices) into a 1mm (or custom) accuracy. There are hundreds of inaccurate line elements within the drawing .
I have a program that makes 3d polylines from various data. That 3d pline then gets added to a civil 3d surface as a breakline. I want to modify the pline with my program, but preserve the handle, as I think that is what C3D uses to decide if its part of the surface. I tried this as a sample with no luck:
;DELETE 3RD VERTEXT FROM 3D PLINE (DEFUN C:T3 ( / EN ENAME ENT ENTL) ;GET 3D PLINE (SETQ ENT (ENTSEL " Select 3D Pline:")
[Code] .....
I know you can modify a vertex, but what about add and delete with entmake and entmod? I also considered using activex for this task, but you can only add verticies from what I could tell in the object browser of VBA, not delete them.
What I will be doing is deleting all the verticies and adding back the correct ones. Or if there was a way to transfer a handle to a new entity after deleting the old, that would suffice too.
I need to change the color of all lines/plines that intersect a given pline. How would I go about making the selection set of all lines that intersect that given pline.
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.
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?
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.
Is there a lisp that will allow me to do a continuous dimension, but will alternate the dimension position from low, high, low and high? If there is no lisp already created, how to create one?
See Continuous dimension attachment for example.
I work at a glass and glazing company and this is how we dimension mullion width and DLO. See typical window dimensioning attachment for window elevation with dimensions.
I have a list ("temp.dwg" "temp2.dwg") and would like to add the string "insert text here" into each item in the list resulting in ("insert text heretemp.dwg" "insert textheretemp2.dwg"). how would i go about doing that using LISP?
Is there a way to programatically set a visual style before a drawing actually opens?
We have some huge models and people seem to forget to change their visual styles back to 2D wireframe before saving and exiting drawings. Some models will crash on some workstations when trying to open in a rendered mode.
I found a lisp with a function that looked to set viewport visual styles. But it does not seem to be supported anymore. --> (vla-put-VisualStyle vport 1)
I'm trying to write a lisp routine that, when I invoke the mleader command, osmode is set to "nearest" & orthomode is set off. I then would like the original settings to be returned.
Lisp that switches back on Selection Preview i.e. thickens and highlights lines when you hover over them?I don't know why, but they are always unticking the boxes.
Is it possible to execute a certain command based on multiple selections withinin a dcl? for example: two radio colums, one with selections A and B, and a second with selections 1 and 2. is it possible to program commands based on user selections from each column? ex: if A and 1- do a command. A 2- do a different command, etc...
I tried :
(action_tile "key1" "(setq A t") (action_tile "key2" "(setq B t")
I am trying to find a lisp that would get an attribute value (tag name = NBR_5) . I'm trying to run a simple routine that would let the user place the value from the titleblock attribute as text on a drawing. I see a ton of articles regarding getting attributes but I am not well versed in programming.
I'm trying to find acceptable point values to feed to the vlax-3d-point function for a vla-addmtext function. With vanilla lisp I just provide the point as x y = "7/32" "2-3/8". So I assumed that I could drop a 0 in for the z like: (VLAX-3D-POINT "7/32" "2-3/8" 0).
Then I thought I was going to be tricksy and try (vlax-3D-point (getpoint)) believing that I could pick the point and get what I need to feed the function, but yet again, no deal. The command line gave me:
node of #<variant 8197 ...>
Nothing I can use in my code. So how do I find the point in a format that vlax-3d-point will like?
