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Start analyzing depth profile: smoothing and time-based min/max/avg

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This turns the depth profile into a generic "plot_info" and calculates
minima, maxima and averages over 1-, 2- and 3-minute intervals for each
point.  It also creates a smoothed version.

We currently don't actually show the results, but that's the next step..

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2011-09-08 08:33:02 -07:00
parent 30d228f104
commit 2d9ac73e38
1 changed files with 125 additions and 15 deletions
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140
profile.c
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@ -1,6 +1,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <time.h>
#include "dive.h"
@ -23,6 +24,21 @@ struct graphics_context {
double scalex, scaley;
};
/* Plot info with smoothing and one-, two- and three-minute minimums and maximums */
struct plot_info {
int nr;
int maxtime;
struct plot_data {
int sec;
int val;
int smoothed;
int min[3];
int max[3];
int avg[3];
} entry[];
};
#define plot_info_size(nr) (sizeof(struct plot_info) + (nr)*sizeof(struct plot_data))
/* Scale to 0,0 -> maxx,maxy */
#define SCALE(gc,x,y) (x)*gc->maxx/gc->scalex,(y)*gc->maxy/gc->scaley
@ -218,18 +234,14 @@ static void plot_depth_text(struct dive *dive, struct graphics_context *gc)
plot_text_samples(gc, sample, end);
}
static void plot_depth_profile(struct dive *dive, struct graphics_context *gc)
static void plot_depth_profile(struct dive *dive, struct graphics_context *gc, struct plot_info *pi)
{
int i;
cairo_t *cr = gc->cr;
int begins, sec, depth;
int i, samples;
struct sample *sample;
struct plot_data *entry;
int maxtime, maxdepth, marker;
samples = dive->samples;
if (!samples)
return;
cairo_set_line_width(gc->cr, 2);
/* Get plot scaling limits */
@ -267,15 +279,15 @@ static void plot_depth_profile(struct dive *dive, struct graphics_context *gc)
gc->scalex = maxtime;
sample = dive->sample;
entry = pi->entry;
cairo_set_source_rgba(cr, 1, 0.2, 0.2, 0.80);
begins = sample->time.seconds;
move_to(gc, sample->time.seconds, sample->depth.mm);
for (i = 1; i < dive->samples; i++) {
sample++;
sec = sample->time.seconds;
begins = entry->sec;
move_to(gc, entry->sec, entry->val);
for (i = 1; i < pi->nr; i++) {
entry++;
sec = entry->sec;
if (sec <= maxtime) {
depth = sample->depth.mm;
depth = entry->val;
line_to(gc, sec, depth);
}
}
@ -444,9 +456,107 @@ static void plot_cylinder_pressure_text(struct dive *dive, struct graphics_conte
}
}
static void analyze_plot_info_minmax_minute(struct plot_data *entry, struct plot_data *first, struct plot_data *last, int index)
{
struct plot_data *p = entry;
int time = entry->sec;
int seconds = 60*(index+1);
int min, max, avg, nr;
/* Go back 'seconds' in time */
while (p > first) {
if (p[-1].sec < time - seconds)
break;
p--;
}
/* Then go forward until we hit an entry past the time */
min = max = avg = p->val;
nr = 1;
while (++p < last) {
int val = p->val;
if (p->sec > time + seconds)
break;
avg += val;
nr ++;
if (val < min)
min = val;
if (val > max)
max = val;
}
entry->min[index] = min;
entry->max[index] = max;
entry->avg[index] = (avg + nr/2) / nr;
}
static void analyze_plot_info_minmax(struct plot_data *entry, struct plot_data *first, struct plot_data *last)
{
analyze_plot_info_minmax_minute(entry, first, last, 0);
analyze_plot_info_minmax_minute(entry, first, last, 1);
analyze_plot_info_minmax_minute(entry, first, last, 2);
}
static struct plot_info *analyze_plot_info(struct plot_info *pi)
{
int i;
int nr = pi->nr;
/* Smoothing function: 5-point triangular smooth */
for (i = 2; i < nr-2; i++) {
struct plot_data *entry = pi->entry+i;
int val;
val = entry[-2].val + 2*entry[-1].val + 3*entry[0].val + 2*entry[1].val + entry[2].val;
entry->smoothed = (val+4) / 9;
}
/* One-, two- and three-minute minmax data */
for (i = 0; i < nr; i++) {
struct plot_data *entry = pi->entry +i;
analyze_plot_info_minmax(entry, pi->entry, pi->entry+nr);
}
return pi;
}
/*
* Create a plot-info with smoothing and ranged min/max
*
* This also makes sure that we have extra empty events on both
* sides, so that you can do end-points without having to worry
* about it.
*/
static struct plot_info *depth_plot_info(struct dive *dive)
{
int i, nr = dive->samples + 4, sec;
size_t alloc_size = plot_info_size(nr);
struct plot_info *pi;
pi = malloc(alloc_size);
if (!pi)
return pi;
memset(pi, 0, alloc_size);
pi->nr = nr;
sec = 0;
for (i = 0; i < dive->samples; i++) {
struct sample *sample = dive->sample+i;
struct plot_data *entry = pi->entry + i + 2;
sec = entry->sec = sample->time.seconds;
entry->val = sample->depth.mm;
}
/* Fill in the last two entries with empty values but valid times */
i = dive->samples + 2;
pi->entry[i].sec = sec + 20;
pi->entry[i+1].sec = sec + 40;
return analyze_plot_info(pi);
}
static void plot(struct graphics_context *gc, int w, int h, struct dive *dive)
{
double topx, topy;
struct plot_info *pi = depth_plot_info(dive);
topx = w / 20.0;
topy = h / 20.0;
@ -466,7 +576,7 @@ static void plot(struct graphics_context *gc, int w, int h, struct dive *dive)
plot_cylinder_pressure(dive, gc);
/* Depth profile */
plot_depth_profile(dive, gc);
plot_depth_profile(dive, gc, pi);
/* Text on top of all graphs.. */
plot_depth_text(dive, gc);