[pstricks] question about coordinates

[Christophe Jorssen]

pstricks-bounces at tug.org wrote:
> Hi to All,
> 
> I found in a File including PSTricks the following:
> 
>   \multido{\i=1+1}{8}{%
>     \psline[linestyle=dashed](!\i\space 0)(!\i\space 10 \i\space 1
>     add div)% \psline[linestyle=dotted]%
>       (!1 10 \i\space div)(!\i\space  1 sub  10 \i\space div)}
> 
> 
> I understand the multido-package, but I don't understand the
> construction of the coordinates. Who can explain it? What is the
> x-coordinate and what the y-coordinate?

The structure for \SpecialCoor with Postscript raw code is :

(! <PostScript code for x coordinate> <PostScript code for y coordinate>)

So

(! 1 1 add 2 2 add) stands for (2,4)

> 
> Where do I find more about that construktion?

In the reference manual page 72.

> 
> Is it a postscript-code?

Yes.

--
Christophe