Creating Point Lists From Local Variables..?

[lamensterms]

Hi,

 

Just trying to get my head around the process to define points/co-ordinates base on the DIMSCALE, so I have the follow 2 variations of code - the difference between the two is coloured red.

 

(DEFUN C:test ( / xcoord ycoord bpt )
(setq xcoord (* (getvar "dimscale") 424))
(setq ycoord (* (getvar "dimscale") 96))
[color="red"](setq bpt (list xcoord ycoord))[/color]
(command "line" bpt)
(princ)
)

 

(DEFUN C:test ( / xcoord ycoord bpt )
(setq xcoord (* (getvar "dimscale") 424))
(setq ycoord (* (getvar "dimscale") 96))
[color="red"](setq bpt '(xcoord ycoord))[/color]
(command "line" bpt)
(princ)
)

 

My question is, why does the first code work, but the second fails? No error message is given. Where am I going wrong with the list quoting?

 

Thanks a lot for any help.

[LosGirk]

I've run across this same thing before. I don't know much, but here's what I do know:

 

After removing the declared variables (DEFUN C:test (), and banging (!bpt)...

 

The first case returns: (424.0 96.0), the second: (XCOORD YCOORD).

 

So I'd guess maybe they're both ways to create a list, the first is designed for when you need an integer returned, the second way is for if your code needs a string returned? I'm interested to know the real answer, good luck!

[lamensterms]

Good point LosGirk. Perhaps quoting the variables adds the variables to the list, rather than the values of the variables.

 

Thanks for the reply.

[Snownut]

Good point LosGirk. Perhaps quoting the variables adds the variables to the list, rather than the values of the variables.

 

That's exactly how it works....

[marko_ribar]

Read following explanation by Lee Mac to understand...

 

http://www.lee-mac.com/quote.html

 

M.R.

[Lee Mac]

Read following explanation by Lee Mac to understand...

 

http://www.lee-mac.com/quote.html

 

Thank you Marko, I was just about to suggest that when reading this thread!

[lamensterms]

Understood (now). Thanks a lot for the input guys.

 

Great article Lee, thanks also for providing the link Marko.

[Lee Mac]

Great article Lee, thanks also for providing the link Marko.

 

Thank you lamensterms - I'm glad that the explanation was clear