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

[Thomas S. <t.s...@fz...>]

the factor for the wxt-terminal is 20,
in 'gnuplot/src/wxterminal/gp_cairo.h':

/* oversampling scale */
#define GP_CAIRO_SCALE 20

if you read out the mouse coordinates in axis units, you may
convert these to '20*pixel' units using GPVAL_TERM_* and
GPVAL_X/Y_*.
then you may generate the circles coordinates and convert
back to axis units, specifying the center and the radius in
x-axis units.


ZoltánVörös wrote:
> 
>> 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
> 
> 
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