+ sec = sample->time.seconds;
+ depth = to_feet(sample->depth);
+ cairo_line_to(cr, SCALE(sec, depth));
+ }
+ scaley = 1.0;
+ cairo_line_to(cr, SCALE(sec, 0));
+ cairo_line_to(cr, SCALE(begins, 0));
+ cairo_close_path(cr);
+ cairo_set_source_rgba(cr, 1, 0.2, 0.2, 0.20);
+ cairo_fill_preserve(cr);
+ cairo_set_source_rgba(cr, 1, 0.2, 0.2, 0.80);
+ cairo_stroke(cr);
+
+ scalex = maxtime;
+ scaley = maxdepth;
+
+ maxdepth = mindepth = 0;
+ maxtime = 0;
+ 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) {
+ sample = dive->sample+i;
+ sec = sample->time.seconds;
+ depth = to_feet(sample->depth);
+ plot_text(cr, SCALE(sec, depth), "%d ft", depth);
+ i = next_minmax(dive, i, 0);
+ if (!i)
+ break;
+ }
+}
+
+static int get_cylinder_pressure_range(struct dive *dive, double *scalex, double *scaley)
+{
+ int i;
+ double min, max;
+
+ *scalex = round_seconds_up(dive->duration.seconds);
+
+ max = 0;
+ min = 5000;
+ for (i = 0; i < dive->samples; i++) {
+ struct sample *sample = dive->sample + i;
+ double bar;
+
+ /* FIXME! We only track cylinder 0 right now */
+ if (sample->cylinderindex)
+ continue;
+ if (!sample->cylinderpressure.mbar)
+ continue;
+ bar = sample->cylinderpressure.mbar;
+ if (bar < min)
+ min = bar;
+ if (bar > max)
+ max = bar;
+ }
+ if (!max)
+ return 0;
+ *scaley = max * 1.5;
+ return 1;
+}
+
+static void plot_cylinder_pressure(struct dive *dive, cairo_t *cr,
+ double topx, double topy, double maxx, double maxy)
+{
+ int i, sec = -1;
+ double scalex, scaley;
+
+ if (!get_cylinder_pressure_range(dive, &scalex, &scaley))
+ return;
+
+ cairo_set_source_rgba(cr, 0.2, 1.0, 0.2, 0.80);
+
+ cairo_move_to(cr, SCALE(0, dive->cylinder[0].start.mbar));
+ for (i = 1; i < dive->samples; i++) {
+ int mbar;
+ struct sample *sample = dive->sample + i;
+
+ mbar = sample->cylinderpressure.mbar;
+ if (!mbar)
+ continue;
+ sec = sample->time.seconds;
+ cairo_line_to(cr, SCALE(sec, mbar));