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 Good Lisp Practices
...s are meant to be global, declare all variables to be local to the routine. eg. (defun c:test (/ var1 var2) where var1 & var2 are local, all other variables are then global.
The use of local vari...
- What is the Purpose of the Brackets after (defun c:xxx... ?
...in a function and a variable is referring to itself.
Take this code for example:
(defun c:test ()
(vl-load-com)
(foreach x '(1 2 3 4 5)
(setq aList (cons x aList)))
(alert (v...
- How do I Create an Error Handler in LISP?
...g the *Error*
Below is a piece of sample code to which we can add an error handler:
(defun c:test ()
(getreal "\nHit Escape to Force Error...")
(princ))
Firstly we shall test the def...
- Loss of Toolbars, Menus, etc
Latest Change: 11 June 2009 Alterations:changed category If, when opening AutoCAD, most or all of the pull down menus are missing, there are a couple of things that could be wrong - The correct pro...
- What is the text box that appears beside my cursor? [beta]
...oordinates while dynamic input is on? As it stands the grammar looks fine! Current author: Tiger Latest revision: 4 May 2009 Alterations: Complete re-write, old version in grey Formatted Sys Vars ~...
- How do I scale in just one direction?
Latest Change: 11 June 2009 Alterations: Changed category There are no one singular command in basic AutoCAD that can accomplish scaling in one direction. Depending on what type of AutoCAD is used th...
- My settings have changed
Current author: Tiger Latest revision: 5 May 2009 Alterations: Changed after Remarks suggestion Most settings in AutoCAD are controlled by variables, these can either be saved in the drawing or saved...
- How do I find out where a drawing is x-reffed to?
Latest Change: 11 June 2009 Changes: Changed category Open DesignCenter. The Folders tab on the left displays a tree view of the hard drive or network drive. Clicking the + sign next to any item di...
- How do I create a DWG from a PDF?
Latest Change: 11 June 2009 Changes: changed category AutoCAD does not have a built in tool to convert PDF files to DWG files. PDFs can be imported into AutoCAD as an OLE Object (Insert > OLE Ob...
- Basic concept of UCS in 3D [beta]
The World Coordinate System (or simply WCS) is one of the foremost things to understand when working in the 3D environment. Conventionally, when viewing from top (Top View), the horizontal axis i...
- Generate sections and elevations of a 3D Solid [beta]
There are basically three ways of generating sections of your 3D solid model: 1. SOLVIEW / SOLDRAW commands: These commands work only in the Layouts. Make a new viewport containing the planner (To...
- How do I draw in AutoCad? [beta]
1. Model Space
In AutoCad, always draw in Model Space at a scale of 1:1. Autocad uses drawing units. 1 AutoCad drawing unit = 1 whatever unit, be it millimetres, metres, feet, miles or light...
- How do I insert a block along a curve [beta]
Insert block at random points along curve: Insert the block using osnap "nea" to insert it at any random point along the curve. Insert block at regular intervals along curve: To insert the block...
- How does AutoCAD store drawing information? [beta]
AutoCAD DWG files are basically databases. It uses the records / fields format much the same as any database. There 2 major type of records, graphical and non graphical. Records or definitions as t...
- How do I check the mass properties of a 3D solid? [beta]
AutoCAD automatically computes and displays general mass properties, like Centroid, Moment of Inertia, Radii of Gyration etc, for Regions and 3D objects. Use the MASSPROP command and select the req...
- How do I assign materials/textures to a 3d solid, in AutoCAD 2008? [beta]
If you have already created/added materials in the drawing: 1. Type in MAT (for available materials) 2. Double click the material you wish to apply 3. Next, select the solid. That’s it. If you wis...
- How do I move a drawing onto known mapping coordinates [beta]
Before you can do this, you must set your drawing up to use Cartesian coordinates. Use the UNITS command to set this up, and fill in the UNITS dialogue boxes as follows: When you enter coordinates ...
- How can I plot only the " inked " area of a drawing? [beta]
The first thing that has to be explained here, is the difference between plotting (printing) to a sheet size using "plot extents", and plotting to "inked area". Plotting to a preset sheet size using...
- How do I create a custom toolbar? [beta]
..., type the new name required for this new toolbar. For this exercise the new toolbar has been named testtest.
Other ways to name the new toolbar are:
· Right mouse click the new t...
- Setting up a drawing and using scales [beta]
All drawing is done in model space, at a scale of 1:1. That is the golden rule of AutoCad.
1 AutoCad drawing unit can equal whatever, (be it metres, millimetres, inches, feet, miles, or light...
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