interactively modifying a "1d" plot with the mouse?

[Rob Mahurin]

On Jan 5, 2009, at 11:24 PM, roumba wrote:
> Hi all,
>
> I am trying to find a way to modify the plot of a monodimensional  
> array,
> using the mouse.
> Basically I need to be able to drag my mouse over the plotted  
> function and
> when I click and drag a point in the curve, that point would move  
> and modify
> the curve accordingly. The result of the modifed curve should be  
> returned as
> an array.
> What would be the easiest way of acheiving this? Is there any  
> octave GUI
> module that already does something similar? Should I learn openGL  
> and write
> a .oct for that? What would be the best approach?
>
> I am running octave 3.0.1 under OS X 10.4.11 and aquaterm 1.0.1


I think that Octave sends plotting output to gnuplot, aquaterm, and  
the other plotting backends, but does not read from them.

You can sort of do this if you plot using gnuplot and x11.  With an  
x11 plot the coordinates of the mouse pointer appear at the bottom of  
the plot.  You can middle-click or option-click to mark a point on  
the plot, and double-click to copy the coordinates of the point to  
the x11 clipboard.  To copy the x11 clipboard to the OSX clipboard,  
press apple-C.

So, you can get the coordinates of a point with the mouse, but  
perhaps not in a straightforward way.  I can imagine a script to  
identify and update a point in an array based on this sort of input,  
but not with any elegance.

Cheers,
Rob

-- 
Rob Mahurin
Department of Physics and Astronomy
University of Tennessee 		865 207 2594
Knoxville, TN 37996 			rob at utk.edu