In my previous post I was talking about this AutoLISP program. I showed you what screens are created by the AutoLISP program.
I told you about the complication there was and I gave you the complete AutoLISP program. Have you copied it to a text file?
The Actions Of The AutoLISP Program
This is what needs to be done by the AutoLISP program:
1. Switch off command echos
2. Set the limits
3. Set the snap
4. Set the grid
5. Display the whole screen
6. Make the whole screen empty
7. Lines are drawn
8. Pick point in the room
9. Find line of the room
10. Create list of points of the lines
11. Draw the donuts
12. Hatch the room
I have created functions in the AutoLISP program. The functions do what needs to be done.
The Functions
The START Function
I start with the START function. By that function the first six actions are performed. You already know how that function works.
Here is the START function:
(defun start (/ ss p1 p2)
(setvar "cmdecho" 0)
(command "blipmode" "off")
(command "limits" (list 0.0 0.0)
(list 120.0 120.0)
)
(command "snap" "on")
(command "snap" 10)
(command "grid" 10)
(command "zoom" "all")
(command "zoom" "0.8x")
(setq p1 (getvar "vsmin")
p2 (getvar "vsmax")
)
(setq ss (ssget "c" p1 p2))
(if ss
(command "erase" "all" "")
)
)
There is no function for picking a point in the room. It is done in the main program. Using the GETPOINT function.
The DRLNS Function
The DRLNS function is used to draw the lines of the room. The LINE command is used and the points are specified as a list.
Here is the DRLNS fucntion.
(defun drlns ()
(command "line" (list 10 10)
(list 30 10)
(list 30 30)
(list 60 30)
(list 60 10)
(list 110 10)
(list 110 110)
(list 10 110)
"c"
)
)
The FNDET Function
A line of the room has to be found after picking a point in the room. That is done with the FNDET function.
Here is the FNDET function.
(defun fndet (pt / ds ss)
(setq ds 10
ss nil
)
(while (null ss)
(setq ss (ssget "c"
pt
(polar pt 0 ds)
)
)
(if ss
(setq et (ssname ss 0))
(setq ds (+ ds 10))
)
)
et
)
The point that has been picked in the room is given to the function. And then a selection set is found with the SSGET function.
For that function the crossing option is used. The SSGET function works with two points. The first point is the point that has been picked.
The second point is found by using the POLAR contention. There is started with a distance of ten. And that distance is increased all the time.
Finding the selection set is done in a WHILE loop. The WHILE loop continues as long as no selection set is found.
If a selection set is found, then a line has been found. The entity of the line is found with the SSNAME function.
The name of the entity is given back by the function to the main program. It is used for the next function.
The FNDLS Function
Here is the FNDLS function. The function is used to find a list of points. The points are found at the end of each line of the room.
(defun fndls (et / fe cn el p1 p2 ls ss et pt)
(setq fe et
cn T
el (entget et)
p1 (cdr (assoc 10 el))
p2 (cdr (assoc 11 el))
ls (list p2)
ls (append (list p1) ls)
)
(while cn
(setq ss (ssget "c" p1 p1)
e1 (ssname ss 0)
)
(if (equal e1 et)
(setq et (ssname ss 1))
(setq et e1)
)
(setq el (entget et)
pt (cdr (assoc 10 el))
)
(if (equal pt p1)
(setq p1 (cdr (assoc 11 el)))
(setq p1 pt)
)
(setq ls (append (list pt) ls))
(if (equal et fe)
(setq cn nil)
)
)
ls
)
The function starts with giving the CN variable the value of true. The entity list of the line is found and the two points of the line.
The lines are written to a list. And then we get a WHILE loop. The WHILE loop continues as long as the variable CN has the value of true.
The selection set of the first point of the line is found. In the selection set are two lines. The previous line and a new line.
The new line is taken. There is checked what point hasn’t been found before. And that point is written to the list.
Writing a point to the list is done with the APPEND function. But it is important that the point is turned into a list.
This goes on until the point, that is found, is equal to the first point that has been found. That point is in the FE variable.
The DRWDN Function
With the previous function a list of points has been cremated. The list of points is given back to the main program.
The list of points if given to the DRWDN function. And it used to draw all the donuts at the ends of all lines.
(defun drwdn (ls / ct)
(setq ct 0)
(while (setq pt (nth ct ls))
(command "donut" 0 2.5 pt "")
(setq ct (1+ ct))
)
)
How is it done? Easy. The CT variable gets the value of zero. It is used to find the first point of the list.
The function opens with a WHILE loop. A donut is drawn in that point. And the value of the CT variable is increased with one.
The next point of the list of points is taken and a new donut is drawn. The WHILE loop continues as long as points are found.
The DRHTC Function
All the donuts are drawn, Now I want to draw a hatch in the room. That is done with the DRHTC function.
In the fucntion the BHATCH command is used. But before the name of the command there is placed a dash. I don't want a dialog box.
After starting the command I enter P. I want to specify the specifications of the hatch that is to be drawn.
The pattern of the hatch is ANSI31 and the scale of pattern is 50. The angle of the pattern is zero. Very good.
Now an internal point is specified. I could have taken the point that has been picked in the room. But I already know the internal point.
The internal point is 60,60. I enter (LIST 60 60) for the internal point. And an ENTER is entered too. Now the hatch is drawn.
(defun drhtc ()
(command "-bhatch" "p"
"ANSI31"
50
0
(list 60 60)
""
)
)
The ENDPR Function
Everything that needed to be done, has been done. The ENDPR function is started. Here is the function. You already know about it.
(defun endpr ()
(setvar "cmdecho" 1)
(princ)
)
The Complete AutoLISP Program
You have got the complete AutoLISP program with an explanation of all the functions. Copy it to a text file and run it.
I hope everything was clear. If not. Let me know. You know how you can do that. Maybe I should have been more clearer.
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Comment
In the mean time. If you have any questions. Or you want to tell me something. Feel free to add a comment to this blog. I would love to hear from you. And when you come to me with a comment. I will give a reply to your question or remark. |
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Warning Don't spend a lot of money on AutoCAD Light. It is only for creating 2D drawings and it doesn't support AutoLISP. There is a very similar CAD program. And that is completely free. The name of the program? DraftSight. How to get it? Do a search on Google for “download DraftSight”. And you will find where you can download the program. |
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Only
Create Drawings When your CAD operators don't create the borders of your drawings, a lot of time is saved. You get your drawings much faster. I have created a program that does exactly that. An AutoCAD drawing has been created and the program draws a border around it. If you want to see how the program works, go to YouTube. You'll find the working of the program here: http://www.youtu.be/O8Zy6n9zS8Q Now the AutoLISP program gives you the choice to select the size of your border. You can select A4, A3, A2, or A1. Maybe you already know the size of the border of your drawing. Maybe all your drawings have the size A1. If so. Let me know. That is important. The program finds the proper scale of your drawing. Or do you already know what the scale always is? I can write the AutoLISP program that you want. The price? I will only charge you RM 600.-. That is less than US $ 200.-. |
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Resource
Box Jos van Doorn is an AutoLISP programmer and blogger. He is originally from Holland and now he lives in Malaysia. He is the founder of the Make AutoCAD Fast business. Make AutoCAD Fast is writing AutoLISP programs for AutoCAD users. Make AutoCAD Fast created an AutoLISP program for drawing a border around AutoCAD drawings. The program can be found on YouTube. http://www.youtu.be/O8Zy6n9zS8Q Jos is writing a blog. In it are AutoLISP programs with information and it is about Make AutoCAD Fast. You can find his blog here: http://www.makeautocadfast.blogspot.com Maybe you have a question. Or want to tell me something. You can contact me on this e-mail address: makeautocadfast@ymail.com |
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This article may be
freely reprinted or distributed in its entirety in any Ezine,
newsletter, blog, or website. As long as the following resource
box is added: ------------------------------------------------- This article is written by Jos van Doorn. He is an AutoLISP programmer who has helped engineering firms and architects to get their AutoCAD drawings fast, without waiting for hours. You can find more valuable information about his business and AutoLISP at his blog. It is here: http://www.makeautocadfast.blogspot.com If you want to contact him. Go to his blog and leave a comment. ------------------------------------------------- |
