Re: cairo terminals and aspect ratio

[<tim...@lp...>]

Ethan Merritt a écrit :
> On Monday 19 November 2007 13:27, Allin Cottrell wrote:
>   
>> set size square
>>
>> But this does not produce a circle in pngcairo and pdfcairo: it 
>> produces a vertically elongated ellipse.  
>>     
>
> You are right.  
> It looks like the aspect ratio code is broken in
> all of the cairo-based terminals including wxt.
>
> Worse, I can't even see how it is _supposed_ to work.
> Who/what/where is maintaining the values of 
>    term->xmax   and  term->ymax
>    term->h_tic  and  term->v_tic ?
> These are used to calculate aspect ratio, but I think the
> cairo drivers are not setting them to useful values either
> initially or when the window is resized.
>
> I'm hoping Timothée can provide a simple fix.
>   

Hi,

term->xmax and term->ymax are updated in *_graphics(), the latter also 
calls *_set_font() which sets term->h_tic, v_tic, v_char, h_char, based 
on the font size.

For me it works:

set term wxt
set size square
set polar
plot 1

...gives a square circle.

And it works in pfdcairo and pngcairo too...

Could you give the whole sequence of commands you use ?

Best regards,

Timothée