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Plot shorter (apnea) dives with a reasonable scale

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The time marker increments have also been changed to better values.
Also, display more time information for short dives.

Signed-off-by: Maximilian Güntner <maximilian.guentner@gmail.com>
This commit is contained in:
Maximilian Güntner 2012-06-08 02:54:02 +02:00
parent 697435b249
commit 4229e89fc1
1 changed files with 30 additions and 7 deletions
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29
profile.c
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@ -181,15 +181,23 @@ static void dump_pi (struct plot_info *pi)
* current dive. However, we don't scale past less than
* 30 minutes or 90 ft, just so that small dives show
* up as such.
* If the dive time is shorter than 10 minutes we assume that
* this has been an apnea dive and display it accordingly.
* we also need to add 180 seconds at the end so the min/max
* plots correctly
*/
static int get_maxtime(struct plot_info *pi)
{
int seconds = pi->maxtime;
if (seconds < 600)
{
/* Possible apnea dive, we scale accordingly */
return ROUND_UP(seconds+seconds/4, 60);
} else {
/* min 30 minutes, rounded up to 5 minutes, with at least 2.5 minutes to spare */
return MAX(30*60, ROUND_UP(seconds+150, 60*5));
}
}
static int get_maxdepth(struct plot_info *pi)
{
@ -448,7 +456,15 @@ static void plot_depth_profile(struct graphics_context *gc, struct plot_info *pi
/* Get plot scaling limits */
maxtime = get_maxtime(pi);
maxdepth = get_maxdepth(pi);
/* We check whether this has been an apnea dive and overwrite
* the increments in order to get reasonable time markers */
if (maxtime < 600)
{
increments[0] = 10;
increments[1] = 30;
increments[2] = 60;
increments[3] = 5*60;
}
/* Time markers: at most every 5 min, but no more than 12 markers
* and for convenience we do 5, 10, 15 or 30 min intervals.
* This allows for 6h dives - enough (I hope) for even the craziest
@ -473,11 +489,18 @@ static void plot_depth_profile(struct graphics_context *gc, struct plot_info *pi
}
cairo_stroke(cr);
/* now the text on every second time marker */
/* now the text on the time markers */
text_render_options_t tro = {10, TIME_TEXT, CENTER, TOP};
if (maxtime < 600)
{
/* Be a bit more verbose with shorter (apnea) dives */
for (i = incr; i < maxtime; i += incr)
plot_text(gc, &tro, i, 1, "%d:%d", i/60, i%60);
} else {
/* Only render the time on every second marker for normal dives */
for (i = incr; i < maxtime; i += 2 * incr)
plot_text(gc, &tro, i, 1, "%d", i/60);
}
/* Depth markers: every 30 ft or 10 m*/
gc->leftx = 0; gc->rightx = 1.0;
gc->topy = 0; gc->bottomy = maxdepth;