Hi Alan,
> I assume you are referring to the kind of plot that is discussed in
> http://en.wikipedia.org/wiki/Box_plot.
Yes, that's what I mean.
> We currently have no higher-level API to support that. Of course,
> you could make your own function to do that using lower-level PLplot
> commands.
I am now drawing such a box plot. I also want to mark outliers with
circles. Which aspect ratio do I need to draw undistorted circles?
(In other words: How to map world to device coordinates?)
As I don't want to use "o" letters, I tried the following, but it gives
me ellipses, e.g. when called in x12c.c:
plcircle(PLFLT x, PLFLT y)
{
PLFLT vpxmin, vpxmax, vpymin, vpymax;
PLFLT ratio, rx, ry;
int i;
static PLFLT cx[31], cy[31];
/* get axis ratio */
plgvpw(&vpxmin, &vpxmax, &vpymin, &vpymax);
ratio = (vpxmax -vpxmin) / (vpymax -vpymin);
ry = 1.;
rx = ratio * ry;
for (i = 0; i <= 30; ++i) {
cx[i] = x + cos(i / 30. * 2. * M_PI) * rx;
cy[i] = y + sin(i / 30. * 2. * M_PI) * ry;
}
pllsty(1);
plline(31, cx, cy);
}
(I also don't understand the meaning of plgvpd(). What exactly are
"normalized device coordinates", e.g. when I use the wxwidgets device?)
-- Robert
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