Alan W. Irwin wrote:
>> I tried the following, but it gives
>> me ellipses, e.g. when called in x12c.c:
[...]
>> /* get axis ratio */
>> plgvpw(&vpxmin, &vpxmax, &vpymin, &vpymax);
>> ratio = (vpxmax -vpxmin) / (vpymax -vpymin);
>
> What you appear to need is something that returns real device units
> (whether they are in pixels, points, or mm doesn't matter since it is
> only the ratio the determines the aspect ratio). I therefore suggest
> you try plgspa or plgpage.
Thank you - the following works for me:
/* get ratio s.t. ellipse appears as circle */
plgvpw(&vpxmin, &vpxmax, &vpymin, &vpymax);
axisratio = (vpxmax -vpxmin) / (vpymax -vpymin);
plgpage(&px, &py, &pxlen, &pylen, &pxoff, &pyoff);
pageratio = pxlen * 1. / pylen;
ratio = axisratio / pageratio;
-- Robert
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