struct graphics_context {
cairo_t *cr;
double maxx, maxy;
- double scalex, scaley;
+ double leftx, rightx;
+ double topy, bottomy;
};
/* Plot info with smoothing and one-, two- and three-minute minimums and maximums */
#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
+#define SCALEX(gc,x) (((x)-gc->leftx)/(gc->rightx-gc->leftx)*gc->maxx)
+#define SCALEY(gc,y) (((y)-gc->topy)/(gc->bottomy-gc->topy)*gc->maxy)
+#define SCALE(gc,x,y) SCALEX(gc,x),SCALEY(gc,y)
static void move_to(struct graphics_context *gc, double x, double y)
{
maxtime = round_seconds_up(dive->duration.seconds);
maxdepth = round_depth_up(dive->maxdepth);
- gc->scalex = maxtime;
- gc->scaley = maxdepth;
+ gc->leftx = 0; gc->rightx = maxtime;
+ gc->topy = 0; gc->bottomy = maxdepth;
plot_text_samples(gc, pi);
}
maxdepth = round_depth_up(dive->maxdepth);
/* Time markers: every 5 min */
- gc->scalex = maxtime;
- gc->scaley = 1.0;
+ gc->leftx = 0; gc->rightx = maxtime;
+ gc->topy = 0; gc->bottomy = 1.0;
for (i = 5*60; i < maxtime; i += 5*60) {
move_to(gc, i, 0);
line_to(gc, i, 1);
}
/* Depth markers: every 30 ft or 10 m*/
- gc->scalex = 1.0;
- gc->scaley = maxdepth;
+ gc->leftx = 0; gc->rightx = 1.0;
+ gc->topy = 0; gc->bottomy = maxdepth;
switch (output_units.length) {
case METERS: marker = 10000; break;
case FEET: marker = 9144; break; /* 30 ft */
line_to(gc, 1, dive->meandepth.mm);
cairo_stroke(cr);
- gc->scalex = maxtime;
+ gc->leftx = 0; gc->rightx = maxtime;
plot_smoothed_profile(gc, pi);
plot_minmax_profile(gc, pi);
line_to(gc, sec, depth);
}
}
- gc->scaley = 1.0;
+ gc->topy = 0; gc->bottomy = 1.0;
line_to(gc, MIN(sec,maxtime), 0);
line_to(gc, begins, 0);
cairo_close_path(cr);
cairo_stroke(cr);
}
+static void plot_temperature_profile(struct dive *dive, struct graphics_context *gc)
+{
+ int i;
+ cairo_t *cr = gc->cr;
+ int begins = 0, sec = 0;
+ int maxtime, mintemp, maxtemp;
+
+ /* Get plot scaling limits */
+ maxtime = round_seconds_up(dive->duration.seconds);
+ mintemp = INT_MAX;
+ maxtemp = 0;
+ for (i = 0; i < dive->samples; i++) {
+ struct sample *sample = dive->sample+i;
+ int mkelvin = sample->temperature.mkelvin;
+ if (!mkelvin)
+ continue;
+ if (!begins) {
+ begins = mkelvin;
+ sec = sample->time.seconds;
+ }
+ if (mkelvin > maxtemp)
+ maxtemp = mkelvin;
+ if (mkelvin < mintemp)
+ mintemp = mkelvin;
+ }
+ if (mintemp >= maxtemp)
+ return;
+
+ gc->leftx = 0; gc->rightx = maxtime;
+ /* Show temperatures in roughly the lower third */
+ gc->topy = maxtemp + (maxtemp - mintemp)*2;
+ gc->bottomy = mintemp - (maxtemp - mintemp)/2;
+
+ cairo_set_source_rgba(cr, 0.2, 0.2, 1.0, 0.8);
+ move_to(gc, sec, begins);
+ for (i = 0; i < dive->samples; i++) {
+ struct sample *sample = dive->sample+i;
+ int mkelvin = sample->temperature.mkelvin;
+ if (!mkelvin)
+ mkelvin = begins;
+ line_to(gc, sample->time.seconds, mkelvin);
+ begins = mkelvin;
+ }
+ cairo_stroke(cr);
+}
+
/* gets both the actual start and end pressure as well as the scaling factors */
static int get_cylinder_pressure_range(struct dive *dive, struct graphics_context *gc,
pressure_t *startp, pressure_t *endp)
int i;
int min, max;
- gc->scalex = round_seconds_up(dive->duration.seconds);
+ gc->leftx = 0; gc->rightx = round_seconds_up(dive->duration.seconds);
max = 0;
min = 5000000;
endp->mbar = min;
if (!max)
return 0;
- gc->scaley = max * 1.5;
+ gc->topy = 0; gc->bottomy = max * 1.5;
return 1;
}
/* Depth profile */
plot_depth_profile(dive, gc, pi);
+ /* Temperature profile */
+ plot_temperature_profile(dive, gc);
+
/* Text on top of all graphs.. */
plot_depth_text(dive, gc, pi);
plot_cylinder_pressure_text(dive, gc);
/* And info box in the lower right corner.. */
- gc->scalex = gc->scaley = 1.0;
+ gc->leftx = 0; gc->rightx = 1.0;
+ gc->topy = 0; gc->bottomy = 1.0;
plot_info(dive, gc);
/* Bounding box last */