writing 'mouse interactive' routines to extend draw, plot2d, etc.

S. Newhouse escribi?:
>   I am interested in writing some maxima or lisp routines which give
> plot windows with mouse interaction.  For instance, the gnuplot
> interface to draw.lisp allows one to show the coordinates of points in a
> 2d graphic display.  Pressing the middle button at a point will print
> the coordinates on the screen.  I would like to be able to print the
> coordinates to a file, and to have various keyboard combinations do
> other things--e.g. open new graphic windows, etc.
Hello,

Sorry, but I didn't pay much attention to these interactive actions. 
Probably, we could extend some of the features you are suggesting, the 
same way as we did with saving coordinates.

But these actions are between the user and Gnuplot. Another (and very 
interesting) question is how to let Maxima know the actions I'm making 
on the Gnuplot window, so that Maxima could recalculate, replot or make 
anything else the user wants. I confess I don't know if this is even 
possible with the pipes routines we have at hand.

Now that draw has reached (or is approaching to reach) a reasonable 
stable status, maybe it's time to look into these things.

>   Since gnuplot is so
> well developed, I would like to use that as the main engine for these
> purposes.  So, I have been reading
> Mario's 'draw.lisp'.  I noticed that there are variables
>    datastorage
>    cmdstorage
>    datapath
>   
variable datastorage is used to create file data.gnuplot and variable 
cmdstorage is used to create file maxout.gnuplot. On the other hand, 
datapath is the path where these two files are allocated.

Why two files? There are three reasons:

1.- Some plots requiere a lot of data to be piped to Gnuplot, so that I 
have reached the limits of piping. My solution to these problem was to 
pipe only the commands and let data saved appart.

2.- In Gnuplot 4.2 data can be saved in binary files, which would make 
plotting faster. At this moment, Maxima writes data.gnuplot in plain 
text, but I plan to see how to handle the binary formats for Gnuplot.

3.- With two distinct files, I can zoom the plotting window dragging 
with the right button, something I couldn't make before. (I'm not a 
windows user, but I think plot2d has, or had in the past, the same problem)

> But, I don't know where there files are kept and how gnuplot accesses them.
>
>   
maxima_tempdir;

> Would it be easier with openmath?
>   
openmath has some interactive potentials Gnuplot doesn't have. The menus 
and sliders of Jaime's plotdf are good examples.

But I don't know if Maxima could be informed about my mouse and keyboard 
actions on the plotting window.


>  I would greatly appreciate it any hints for this process.  
>   
I hope these comments will be of interest to you.

Mario