#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
+#include <string.h>
#include <time.h>
#include "dive.h"
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
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 */
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);
}
}
}
}
+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;
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);