Re: [Gnuplot-info] What is the meaning of the terminal variables?

[ZoltánVörös <zv...@gm...>]

> those interactive terminals use an internal screen of a fixed
> size which is then scaled to fit into the actual canvas window.
> 
> e.g. X11:
>         GPVAL_TERM_XMIN = 285
>         GPVAL_TERM_XMAX = 4000
>         GPVAL_TERM_YMIN = 236
>         GPVAL_TERM_YMAX = 4019
> always nearly the same values (differ a little bit due to some
> adjustments of the margins because the font size is not scaled),
> regardless of the actual window size and aspect ratio.
> if you plot into an x11 terminal, look at the GPVAL_TERM_*
> variables, then change the plot window size with the mouse,
> replot (is needed to change the variables), and look at the
> variables again, you will see that there is not much change.

Greetings Thomas, 

Many thanks for your effort! I still feel a bit uncomfortable 
with this situation. 

> 
> i think this applies to the wxt terminal in a similar way, but i
> don't have a wxt terminal here, so i can't test it.

I believe, it is 1:20 on wxt. At least, this is what I measured. 
After rescaling the terminal with the mouse, I got quite different numbers. 

My problem is the following: I would like to draw a circle based on 
three points on it. I can read out the mouse variables, but those are 
given as axis coordinates. However, what if I want to use the mouse 
coordinates to draw a circle with respect to the screen? I understand 
that the circle requires axis coordinates, but only for the position. 
I mean, if I want to draw a circle based on coordinates that I get by 
clicking the mouse three times, then I have to have some means of 
converting between the screen and the axes. Is there a way to do that?
Cheers,
Zoltán