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Tweak temperature plot to look better for small fluctuations

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If the temperature is in a very narrow range the existing code visually
exaggerated the fluctuations. This tries to dampen that effect a bit.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Dirk Hohndel 2011-09-16 11:35:04 -07:00
parent f3e70c5496
commit 40b123f63a
1 changed files with 11 additions and 4 deletions
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15
profile.c
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@ -300,7 +300,7 @@ static void plot_depth_profile(struct graphics_context *gc, struct plot_info *pi
static int setup_temperature_limits(struct graphics_context *gc, struct plot_info *pi)
{
int maxtime, mintemp, maxtemp;
int maxtime, mintemp, maxtemp, delta;
/* Get plot scaling limits */
maxtime = get_maxtime(pi);
@ -308,9 +308,16 @@ static int setup_temperature_limits(struct graphics_context *gc, struct plot_inf
maxtemp = pi->maxtemp;
gc->leftx = 0; gc->rightx = maxtime;
/* Show temperatures in roughly the lower third */
gc->topy = maxtemp + (maxtemp - mintemp)*2;
gc->bottomy = mintemp - (maxtemp - mintemp)/2;
/* Show temperatures in roughly the lower third, but make sure the scale
is at least somewhat reasonable */
delta = maxtemp - mintemp;
if (delta > 3000) { /* more than 3K in fluctuation */
gc->topy = maxtemp + delta*2;
gc->bottomy = mintemp - delta/2;
} else {
gc->topy = maxtemp + 1500 + delta*2;
gc->bottomy = mintemp - delta/2;
}
return maxtemp > mintemp;
}