#include <stdio.h>
#include <stdlib.h>
+#include <stdarg.h>
#include <time.h>
#include "dive.h"
#include "display.h"
+#include "divelist.h"
int selected_dive = 0;
return MAX(90, ROUND_UP(feet+5, 15));
}
+static void plot_text(cairo_t *cr, double x, double y, const char *fmt, ...)
+{
+ cairo_text_extents_t extents;
+ char buffer[80];
+ va_list args;
+
+ va_start(args, fmt);
+ vsnprintf(buffer, sizeof(buffer), fmt, args);
+ va_end(args);
+
+ cairo_text_extents(cr, buffer, &extents);
+
+ x -= extents.width/2 + extents.x_bearing;
+ y += extents.height * 1.2;
+
+ cairo_move_to(cr, x, y);
+ cairo_text_path(cr, buffer);
+ cairo_set_source_rgb(cr, 0, 0, 0);
+ cairo_stroke(cr);
+
+ cairo_move_to(cr, x, y);
+ cairo_set_source_rgb(cr, 1, 0, 0);
+ cairo_show_text(cr, buffer);
+}
+
+/*
+ * Find the next maximum point in a 10-minute window.
+ *
+ * We exit early if we hit "enough" of a depth reversal,
+ * which is roughly 10 feet.
+ */
+static int next_minmax(struct dive *dive, int index, int minmax)
+{
+ const int enough = 3000;
+ int timelimit, depthlimit, result;
+ struct sample *sample = dive->sample + index;
+
+ if (index >= dive->samples)
+ return 0;
+
+ timelimit = 24*60*60;
+ depthlimit = sample->depth.mm;
+ result = 0;
+
+ for (;;) {
+ int time, depth;
+
+ index++;
+ sample++;
+ if (index >= dive->samples)
+ break;
+ time = sample->time.seconds;
+ depth = sample->depth.mm;
+ if (time > timelimit)
+ break;
+
+ if (minmax) {
+ if (depth <= depthlimit) {
+ if (depthlimit - depth > enough)
+ break;
+ continue;
+ }
+ } else {
+ if (depth >= depthlimit) {
+ if (depth - depthlimit > enough)
+ break;
+ continue;
+ }
+ }
+
+ result = index;
+ depthlimit = depth;
+ /* Look up to ten minutes into the future */
+ timelimit = time + 600;
+ }
+ return result;
+}
+
/* Scale to 0,0 -> maxx,maxy */
#define SCALE(x,y) (x)*maxx/scalex+topx,(y)*maxy/scaley+topy
-static void plot_profile(struct dive *dive, cairo_t *cr,
+static void plot_depth_text(struct dive *dive, cairo_t *cr,
+ double topx, double topy, double maxx, double maxy)
+{
+ double scalex, scaley;
+ int maxtime, maxdepth;
+ int i;
+
+ /* Get plot scaling limits */
+ maxtime = round_seconds_up(dive->duration.seconds);
+ maxdepth = round_feet_up(to_feet(dive->maxdepth));
+
+ scalex = maxtime;
+ scaley = maxdepth;
+
+ cairo_set_font_size(cr, 14);
+ cairo_set_source_rgb(cr, 1, 0.2, 0.2);
+ i = 0;
+ while ((i = next_minmax(dive, i, 1)) != 0) {
+ struct sample *sample = dive->sample+i;
+ int sec = sample->time.seconds;
+ int depth = to_feet(sample->depth);
+
+ plot_text(cr, SCALE(sec, depth), "%d ft", depth);
+ i = next_minmax(dive, i, 0);
+ if (!i)
+ break;
+ }
+}
+
+static void plot_depth_profile(struct dive *dive, cairo_t *cr,
double topx, double topy, double maxx, double maxy)
{
double scalex, scaley;
static void plot_cylinder_pressure(struct dive *dive, cairo_t *cr,
double topx, double topy, double maxx, double maxy)
{
- int i;
+ int i, sec = -1;
double scalex, scaley;
if (!get_cylinder_pressure_range(dive, &scalex, &scaley))
cairo_move_to(cr, SCALE(0, dive->cylinder[0].start.mbar));
for (i = 1; i < dive->samples; i++) {
- int sec, mbar;
+ int mbar;
struct sample *sample = dive->sample + i;
- sec = sample->time.seconds;
mbar = sample->cylinderpressure.mbar;
if (!mbar)
continue;
+ sec = sample->time.seconds;
cairo_line_to(cr, SCALE(sec, mbar));
}
- cairo_line_to(cr, SCALE(dive->duration.seconds, dive->cylinder[0].end.mbar));
+ /*
+ * We may have "surface time" events, in which case we don't go
+ * back to dive duration
+ */
+ if (sec < dive->duration.seconds)
+ cairo_line_to(cr, SCALE(dive->duration.seconds, dive->cylinder[0].end.mbar));
cairo_stroke(cr);
}
maxx = (w - 2*topx);
maxy = (h - 2*topy);
+ /* Cylinder pressure plot */
+ plot_cylinder_pressure(dive, cr, topx, topy, maxx, maxy);
+
/* Depth profile */
- plot_profile(dive, cr, topx, topy, maxx, maxy);
+ plot_depth_profile(dive, cr, topx, topy, maxx, maxy);
- /* Cylinder pressure plot? */
- plot_cylinder_pressure(dive, cr, topx, topy, maxx, maxy);
+ /* Text on top of all graphs.. */
+ plot_depth_text(dive, cr, topx, topy, maxx, maxy);
/* Bounding box last */
scalex = scaley = 1.0;