Drawing Polylines with AutoLISP 2

Drawing Polylines with AutoLISP 2


In my last post I told you that I'm going to talk about the AutoLISP program. That is what I'm going to do now.


But I want to do it in a different way than what you possibly are expecting. I will tell you what needs to be done by the program.


What Needs To Be Done


You know how the program works:


- At the start a screen with four line is drawn
- The user selects a line.
- After the selection of a line the polyline is erased, if it is in the drawing.
- A polyline is drawn over the line.
- Even if a polyline has been selected, a polyline is drawn over it.
- When no more line or polyline is selected, the AutoLISP program terminates.


Now you know what needs to be done by the AutoLISP program. And it is done by separate functions of the AutoLISP program.


The Functions


These are the functions that can be found in the AutoLISP program:


Function Action


START Setting the limits, erasing everything in the screen, setting the snap and grid, zooming out of the screen


DRLNS Drawing four lines


FNDET Finding line or polyline entity


DELPL Delete polyline


DRWPL Draw polyline, no intersection with other line


DPLIP Draw polyline, intersection with other line


ENDPR Ending of the program


Writing An AutoLISP Program


Knowing what must be done by the AutoLISP program, that is very important if you want to write an AutoLISP program.


It is figuring out what separate functions need to be written. And that makes programming in AutoLISP so easy.


Next Post


In my next post you will find the complete AutoLISP program. You can copy it to a text file and work with it in your CAD program.


When you work with it, you will see how the AutoLISP program works and you can test it by yourself.


In the posts that are coming after my next post I will be talking about the functions. I will explain how they work.


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To Your Success


Free AutoLISP Course


Sorry. This offer is only for my readers from Malaysia. I want to give an AutoLISP course to them. Free of charge.


I have more than 900 readers. The majority of them is from the USA. More than 500. But I also have readers from Malaysia. About 120.


I don't know what my readers from Malaysia are doing. Are they with an engineering firm or architecture? Or just interested in AutoLISP?


I offer them a free AutoLISP course. It works like this. You let me know if interested and I'll come to your place.


I will give the AutoLISP course at your office. Your people can attend the AutoLISP course. The course consist of 15 lessons.


The first ten lessons are about AutoLISP. All the functions of AutoLISP are explained and there is talked about the system variables.


During the last five lessons we are going to write an AutoLISP program. The people attending the course come with a wish.


That is why this offer is only for my readers from Malaysia. I live in Malaysia. And I do not see how I could travel abroad.


The AutoLISP course is completely free. I will not charge you for the course. But I will ask you to refund my travel expenses.



The people attending the course will get an e-book about AutoLISP. The e-book is a PDF file. What is said in the course, can be found in the book.