2 /* creates all the necessary data for drawing the dive profile
3 * uses cairo to draw it
15 int selected_dive = 0;
17 typedef enum { STABLE, SLOW, MODERATE, FAST, CRAZY } velocity_t;
18 /* Plot info with smoothing, velocity indication
19 * and one-, two- and three-minute minimums and maximums */
23 int meandepth, maxdepth;
24 int minpressure, maxpressure;
25 int endpressure; /* start pressure better be max pressure */
28 unsigned int same_cylinder:1;
29 unsigned int cylinderindex;
31 /* pressure[0] is sensor pressure
32 * pressure[1] is interpolated pressure */
39 struct plot_data *min[3];
40 struct plot_data *max[3];
45 #define INTERPOLATED_PR 1
46 #define SENSOR_PRESSURE(_entry) (_entry)->pressure[SENSOR_PR]
47 #define INTERPOLATED_PRESSURE(_entry) (_entry)->pressure[INTERPOLATED_PR]
49 /* convert velocity to colors */
50 typedef struct { double r, g, b; } rgb_t;
51 static const rgb_t rgb[] = {
52 [STABLE] = {0.0, 0.4, 0.0},
53 [SLOW] = {0.4, 0.8, 0.0},
54 [MODERATE] = {0.8, 0.8, 0.0},
55 [FAST] = {0.8, 0.5, 0.0},
56 [CRAZY] = {1.0, 0.0, 0.0},
59 #define plot_info_size(nr) (sizeof(struct plot_info) + (nr)*sizeof(struct plot_data))
61 /* Scale to 0,0 -> maxx,maxy */
62 #define SCALEX(gc,x) (((x)-gc->leftx)/(gc->rightx-gc->leftx)*gc->maxx)
63 #define SCALEY(gc,y) (((y)-gc->topy)/(gc->bottomy-gc->topy)*gc->maxy)
64 #define SCALE(gc,x,y) SCALEX(gc,x),SCALEY(gc,y)
66 static void move_to(struct graphics_context *gc, double x, double y)
68 cairo_move_to(gc->cr, SCALE(gc, x, y));
71 static void line_to(struct graphics_context *gc, double x, double y)
73 cairo_line_to(gc->cr, SCALE(gc, x, y));
76 static void set_source_rgba(struct graphics_context *gc, double r, double g, double b, double a)
79 * For printers, we still honor 'a', but ignore colors
80 * for now. Black is white and white is black
89 cairo_set_source_rgba(gc->cr, r, g, b, a);
92 void set_source_rgb(struct graphics_context *gc, double r, double g, double b)
94 set_source_rgba(gc, r, g, b, 1);
97 #define ROUND_UP(x,y) ((((x)+(y)-1)/(y))*(y))
100 * When showing dive profiles, we scale things to the
101 * current dive. However, we don't scale past less than
102 * 30 minutes or 90 ft, just so that small dives show
104 * we also need to add 180 seconds at the end so the min/max
107 static int get_maxtime(struct plot_info *pi)
109 int seconds = pi->maxtime;
110 /* min 30 minutes, rounded up to 5 minutes, with at least 2.5 minutes to spare */
111 return MAX(30*60, ROUND_UP(seconds+150, 60*5));
114 static int get_maxdepth(struct plot_info *pi)
116 unsigned mm = pi->maxdepth;
117 /* Minimum 30m, rounded up to 10m, with at least 3m to spare */
118 return MAX(30000, ROUND_UP(mm+3000, 10000));
125 } text_render_options_t;
128 #define CENTER (-0.5)
135 static void plot_text(struct graphics_context *gc, const text_render_options_t *tro,
136 double x, double y, const char *fmt, ...)
138 cairo_t *cr = gc->cr;
139 cairo_font_extents_t fe;
140 cairo_text_extents_t extents;
146 vsnprintf(buffer, sizeof(buffer), fmt, args);
149 cairo_set_font_size(cr, tro->size);
150 cairo_font_extents(cr, &fe);
151 cairo_text_extents(cr, buffer, &extents);
152 dx = tro->hpos * extents.width + extents.x_bearing;
153 dy = tro->vpos * extents.height + fe.descent;
156 cairo_rel_move_to(cr, dx, dy);
158 cairo_text_path(cr, buffer);
159 set_source_rgb(gc, 0, 0, 0);
163 cairo_rel_move_to(cr, dx, dy);
165 set_source_rgb(gc, tro->r, tro->g, tro->b);
166 cairo_show_text(cr, buffer);
173 static struct ev_select *ev_namelist;
174 static int evn_allocated;
177 void remember_event(const char *eventname)
181 if (!eventname || (len = strlen(eventname)) == 0)
183 while (i < evn_used) {
184 if (!strncmp(eventname,ev_namelist[i].ev_name,len))
188 if (evn_used == evn_allocated) {
190 ev_namelist = realloc(ev_namelist, evn_allocated * sizeof(struct ev_select));
192 /* we are screwed, but let's just bail out */
195 ev_namelist[evn_used].ev_name = strdup(eventname);
196 ev_namelist[evn_used].plot_ev = TRUE;
200 static void plot_one_event(struct graphics_context *gc, struct plot_info *pi, struct event *event, const text_render_options_t *tro)
205 for (i = 0; i < pi->nr; i++) {
206 struct plot_data *data = pi->entry + i;
207 if (event->time.seconds < data->sec)
211 /* draw a little tirangular marker and attach tooltip */
212 x = SCALEX(gc, event->time.seconds);
213 y = SCALEY(gc, depth);
214 set_source_rgba(gc, 1.0, 1.0, 0.1, 0.8);
215 cairo_move_to(gc->cr, x-15, y+6);
216 cairo_line_to(gc->cr, x-3 , y+6);
217 cairo_line_to(gc->cr, x-9, y-6);
218 cairo_line_to(gc->cr, x-15, y+6);
219 cairo_stroke_preserve(gc->cr);
221 set_source_rgba(gc, 0.0, 0.0, 0.0, 0.8);
222 cairo_move_to(gc->cr, x-9, y-3);
223 cairo_line_to(gc->cr, x-9, y+1);
224 cairo_move_to(gc->cr, x-9, y+4);
225 cairo_line_to(gc->cr, x-9, y+4);
226 cairo_stroke(gc->cr);
227 attach_tooltip(x-15, y-6, 12, 12, event->name);
230 static void plot_events(struct graphics_context *gc, struct plot_info *pi, struct dive *dive)
232 static const text_render_options_t tro = {14, 1.0, 0.2, 0.2, CENTER, TOP};
233 struct event *event = dive->events;
239 plot_one_event(gc, pi, event, &tro);
244 static void render_depth_sample(struct graphics_context *gc, struct plot_data *entry, const text_render_options_t *tro)
246 int sec = entry->sec, decimals;
249 d = get_depth_units(entry->depth, &decimals, NULL);
251 plot_text(gc, tro, sec, entry->depth, "%.*f", decimals, d);
254 static void plot_text_samples(struct graphics_context *gc, struct plot_info *pi)
256 static const text_render_options_t deep = {14, 1.0, 0.2, 0.2, CENTER, TOP};
257 static const text_render_options_t shallow = {14, 1.0, 0.2, 0.2, CENTER, BOTTOM};
260 for (i = 0; i < pi->nr; i++) {
261 struct plot_data *entry = pi->entry + i;
263 if (entry->depth < 2000)
266 if (entry == entry->max[2])
267 render_depth_sample(gc, entry, &deep);
269 if (entry == entry->min[2])
270 render_depth_sample(gc, entry, &shallow);
274 static void plot_depth_text(struct graphics_context *gc, struct plot_info *pi)
276 int maxtime, maxdepth;
278 /* Get plot scaling limits */
279 maxtime = get_maxtime(pi);
280 maxdepth = get_maxdepth(pi);
282 gc->leftx = 0; gc->rightx = maxtime;
283 gc->topy = 0; gc->bottomy = maxdepth;
285 plot_text_samples(gc, pi);
288 static void plot_smoothed_profile(struct graphics_context *gc, struct plot_info *pi)
291 struct plot_data *entry = pi->entry;
293 set_source_rgba(gc, 1, 0.2, 0.2, 0.20);
294 move_to(gc, entry->sec, entry->smoothed);
295 for (i = 1; i < pi->nr; i++) {
297 line_to(gc, entry->sec, entry->smoothed);
299 cairo_stroke(gc->cr);
302 static void plot_minmax_profile_minute(struct graphics_context *gc, struct plot_info *pi,
306 struct plot_data *entry = pi->entry;
308 set_source_rgba(gc, 1, 0.2, 1, a);
309 move_to(gc, entry->sec, entry->min[index]->depth);
310 for (i = 1; i < pi->nr; i++) {
312 line_to(gc, entry->sec, entry->min[index]->depth);
314 for (i = 1; i < pi->nr; i++) {
315 line_to(gc, entry->sec, entry->max[index]->depth);
318 cairo_close_path(gc->cr);
322 static void plot_minmax_profile(struct graphics_context *gc, struct plot_info *pi)
326 plot_minmax_profile_minute(gc, pi, 2, 0.1);
327 plot_minmax_profile_minute(gc, pi, 1, 0.1);
328 plot_minmax_profile_minute(gc, pi, 0, 0.1);
331 static void plot_depth_profile(struct graphics_context *gc, struct plot_info *pi)
334 cairo_t *cr = gc->cr;
336 struct plot_data *entry;
337 int maxtime, maxdepth, marker;
338 int increments[4] = { 5*60, 10*60, 15*60, 30*60 };
340 /* Get plot scaling limits */
341 maxtime = get_maxtime(pi);
342 maxdepth = get_maxdepth(pi);
344 /* Time markers: at most every 5 min, but no more than 12 markers
345 * and for convenience we do 5, 10, 15 or 30 min intervals.
346 * This allows for 6h dives - enough (I hope) for even the craziest
347 * divers - but just in case, for those 8h depth-record-breaking dives,
348 * we double the interval if this still doesn't get us to 12 or fewer
351 while (maxtime / increments[i] > 12 && i < 4)
353 incr = increments[i];
354 while (maxtime / incr > 12)
357 gc->leftx = 0; gc->rightx = maxtime;
358 gc->topy = 0; gc->bottomy = 1.0;
359 set_source_rgba(gc, 1, 1, 1, 0.5);
360 for (i = incr; i < maxtime; i += incr) {
366 /* now the text on every second time marker */
367 text_render_options_t tro = {10, 0.2, 1.0, 0.2, CENTER, TOP};
368 for (i = incr; i < maxtime; i += 2 * incr)
369 plot_text(gc, &tro, i, 1, "%d", i/60);
371 /* Depth markers: every 30 ft or 10 m*/
372 gc->leftx = 0; gc->rightx = 1.0;
373 gc->topy = 0; gc->bottomy = maxdepth;
374 switch (output_units.length) {
375 case METERS: marker = 10000; break;
376 case FEET: marker = 9144; break; /* 30 ft */
379 set_source_rgba(gc, 1, 1, 1, 0.5);
380 for (i = marker; i < maxdepth; i += marker) {
386 /* Show mean depth */
388 set_source_rgba(gc, 1, 0.2, 0.2, 0.40);
389 move_to(gc, 0, pi->meandepth);
390 line_to(gc, 1, pi->meandepth);
394 gc->leftx = 0; gc->rightx = maxtime;
397 * These are good for debugging text placement etc,
398 * but not for actual display..
401 plot_smoothed_profile(gc, pi);
402 plot_minmax_profile(gc, pi);
405 set_source_rgba(gc, 1, 0.2, 0.2, 0.80);
407 /* Do the depth profile for the neat fill */
408 gc->topy = 0; gc->bottomy = maxdepth;
409 set_source_rgba(gc, 1, 0.2, 0.2, 0.20);
413 for (i = 0; i < pi->nr; i++, entry++)
414 line_to(gc, entry->sec, entry->depth);
415 cairo_close_path(gc->cr);
417 set_source_rgba(gc, 1, 1, 1, 0.2);
418 cairo_fill_preserve(cr);
419 set_source_rgb(gc, 1, 1, 1);
425 /* Now do it again for the velocity colors */
427 for (i = 1; i < pi->nr; i++) {
430 /* we want to draw the segments in different colors
431 * representing the vertical velocity, so we need to
432 * chop this into short segments */
433 rgb_t color = rgb[entry->velocity];
434 depth = entry->depth;
435 set_source_rgb(gc, color.r, color.g, color.b);
436 move_to(gc, entry[-1].sec, entry[-1].depth);
437 line_to(gc, sec, depth);
442 static int setup_temperature_limits(struct graphics_context *gc, struct plot_info *pi)
444 int maxtime, mintemp, maxtemp, delta;
446 /* Get plot scaling limits */
447 maxtime = get_maxtime(pi);
448 mintemp = pi->mintemp;
449 maxtemp = pi->maxtemp;
451 gc->leftx = 0; gc->rightx = maxtime;
452 /* Show temperatures in roughly the lower third, but make sure the scale
453 is at least somewhat reasonable */
454 delta = maxtemp - mintemp;
455 if (delta > 3000) { /* more than 3K in fluctuation */
456 gc->topy = maxtemp + delta*2;
457 gc->bottomy = mintemp - delta/2;
459 gc->topy = maxtemp + 1500 + delta*2;
460 gc->bottomy = mintemp - delta/2;
463 return maxtemp > mintemp;
466 static void plot_single_temp_text(struct graphics_context *gc, int sec, int mkelvin)
470 static const text_render_options_t tro = {12, 0.2, 0.2, 1.0, LEFT, TOP};
471 temperature_t temperature = { mkelvin };
473 if (output_units.temperature == FAHRENHEIT) {
474 deg = to_F(temperature);
475 unit = UTF8_DEGREE "F";
477 deg = to_C(temperature);
478 unit = UTF8_DEGREE "C";
480 plot_text(gc, &tro, sec, temperature.mkelvin, "%d%s", deg, unit);
483 static void plot_temperature_text(struct graphics_context *gc, struct plot_info *pi)
486 int last = 0, sec = 0;
487 int last_temperature = 0, last_printed_temp = 0;
489 if (!setup_temperature_limits(gc, pi))
492 for (i = 0; i < pi->nr; i++) {
493 struct plot_data *entry = pi->entry+i;
494 int mkelvin = entry->temperature;
498 last_temperature = mkelvin;
500 if (sec < last + 300)
503 plot_single_temp_text(gc,sec,mkelvin);
504 last_printed_temp = mkelvin;
506 /* it would be nice to print the end temperature, if it's different */
507 if (abs(last_temperature - last_printed_temp) > 500)
508 plot_single_temp_text(gc, sec, last_temperature);
511 static void plot_temperature_profile(struct graphics_context *gc, struct plot_info *pi)
514 cairo_t *cr = gc->cr;
517 if (!setup_temperature_limits(gc, pi))
520 set_source_rgba(gc, 0.2, 0.2, 1.0, 0.8);
521 for (i = 0; i < pi->nr; i++) {
522 struct plot_data *entry = pi->entry + i;
523 int mkelvin = entry->temperature;
524 int sec = entry->sec;
531 line_to(gc, sec, mkelvin);
533 move_to(gc, sec, mkelvin);
539 /* gets both the actual start and end pressure as well as the scaling factors */
540 static int get_cylinder_pressure_range(struct graphics_context *gc, struct plot_info *pi)
543 gc->rightx = get_maxtime(pi);
545 gc->bottomy = 0; gc->topy = pi->maxpressure * 1.5;
546 return pi->maxpressure != 0;
549 static void plot_pressure_helper(struct graphics_context *gc, struct plot_info *pi, int type)
552 int lift_pen = FALSE;
554 for (i = 0; i < pi->nr; i++) {
556 struct plot_data *entry = pi->entry + i;
558 mbar = entry->pressure[type];
559 if (!entry->same_cylinder)
566 if (i > 0 && entry->same_cylinder) {
567 /* if we have a previous event from the same tank,
568 * draw at least a short line .
569 * This uses the implementation detail that the
570 * type is either 0 or 1 */
572 prev_pr = (entry-1)->pressure[type] ? : (entry-1)->pressure[1 - type];
573 move_to(gc, (entry-1)->sec, prev_pr);
574 line_to(gc, entry->sec, mbar);
576 move_to(gc, entry->sec, mbar);
580 line_to(gc, entry->sec, mbar);
582 cairo_stroke(gc->cr);
586 static void plot_cylinder_pressure(struct graphics_context *gc, struct plot_info *pi)
588 if (!get_cylinder_pressure_range(gc, pi))
591 /* first plot the pressure readings we have from the dive computer */
592 set_source_rgba(gc, 0.2, 1.0, 0.2, 0.80);
593 plot_pressure_helper(gc, pi, SENSOR_PR);
595 /* then, in a different color, the interpolated values */
596 set_source_rgba(gc, 1.0, 1.0, 0.2, 0.80);
597 plot_pressure_helper(gc, pi, INTERPOLATED_PR);
600 static int mbar_to_PSI(int mbar)
602 pressure_t p = {mbar};
606 static void plot_pressure_value(struct graphics_context *gc, int mbar, int sec,
607 int xalign, int yalign)
612 switch (output_units.pressure) {
614 pressure = mbar * 100;
618 pressure = (mbar + 500) / 1000;
622 pressure = mbar_to_PSI(mbar);
626 text_render_options_t tro = {10, 0.2, 1.0, 0.2, xalign, yalign};
627 plot_text(gc, &tro, sec, mbar, "%d %s", pressure, unit);
630 static void plot_cylinder_pressure_text(struct graphics_context *gc, struct plot_info *pi)
634 int seen_cyl[MAX_CYLINDERS] = { FALSE, };
635 int last_pressure[MAX_CYLINDERS] = { 0, };
636 int last_time[MAX_CYLINDERS] = { 0, };
637 struct plot_data *entry;
639 if (!get_cylinder_pressure_range(gc, pi))
642 /* only loop over the actual events from the dive computer */
643 for (i = 2; i < pi->nr - 2; i++) {
644 entry = pi->entry + i;
646 if (!entry->same_cylinder) {
647 cyl = entry->cylinderindex;
648 if (!seen_cyl[cyl]) {
649 mbar = SENSOR_PRESSURE(entry) ? : INTERPOLATED_PRESSURE(entry);
650 plot_pressure_value(gc, mbar, entry->sec, LEFT, BOTTOM);
651 seen_cyl[cyl] = TRUE;
654 /* remember the last pressure and time of
655 * the previous cylinder */
656 cyl = (entry - 1)->cylinderindex;
658 SENSOR_PRESSURE(entry - 1) ? : INTERPOLATED_PRESSURE(entry - 1);
659 last_time[cyl] = (entry - 1)->sec;
663 cyl = entry->cylinderindex;
664 last_pressure[cyl] = SENSOR_PRESSURE(entry) ? : INTERPOLATED_PRESSURE(entry);
665 last_time[cyl] = entry->sec;
667 for (cyl = 0; cyl < MAX_CYLINDERS; cyl++) {
668 if (last_time[cyl]) {
669 plot_pressure_value(gc, last_pressure[cyl], last_time[cyl], CENTER, TOP);
674 static void analyze_plot_info_minmax_minute(struct plot_data *entry, struct plot_data *first, struct plot_data *last, int index)
676 struct plot_data *p = entry;
677 int time = entry->sec;
678 int seconds = 90*(index+1);
679 struct plot_data *min, *max;
682 /* Go back 'seconds' in time */
684 if (p[-1].sec < time - seconds)
689 /* Then go forward until we hit an entry past the time */
694 int depth = p->depth;
695 if (p->sec > time + seconds)
699 if (depth < min->depth)
701 if (depth > max->depth)
704 entry->min[index] = min;
705 entry->max[index] = max;
706 entry->avg[index] = (avg + nr/2) / nr;
709 static void analyze_plot_info_minmax(struct plot_data *entry, struct plot_data *first, struct plot_data *last)
711 analyze_plot_info_minmax_minute(entry, first, last, 0);
712 analyze_plot_info_minmax_minute(entry, first, last, 1);
713 analyze_plot_info_minmax_minute(entry, first, last, 2);
716 static velocity_t velocity(int speed)
720 if (speed < -304) /* ascent faster than -60ft/min */
722 else if (speed < -152) /* above -30ft/min */
724 else if (speed < -76) /* -15ft/min */
726 else if (speed < -25) /* -5ft/min */
728 else if (speed < 25) /* very hard to find data, but it appears that the recommendations
729 for descent are usually about 2x ascent rate; still, we want
730 stable to mean stable */
732 else if (speed < 152) /* between 5 and 30ft/min is considered slow */
734 else if (speed < 304) /* up to 60ft/min is moderate */
736 else if (speed < 507) /* up to 100ft/min is fast */
738 else /* more than that is just crazy - you'll blow your ears out */
743 static struct plot_info *analyze_plot_info(struct plot_info *pi)
748 /* Do pressure min/max based on the non-surface data */
749 for (i = 0; i < nr; i++) {
750 struct plot_data *entry = pi->entry+i;
751 int pressure = SENSOR_PRESSURE(entry) ? : INTERPOLATED_PRESSURE(entry);
752 int temperature = entry->temperature;
755 if (!pi->minpressure || pressure < pi->minpressure)
756 pi->minpressure = pressure;
757 if (pressure > pi->maxpressure)
758 pi->maxpressure = pressure;
762 if (!pi->mintemp || temperature < pi->mintemp)
763 pi->mintemp = temperature;
764 if (temperature > pi->maxtemp)
765 pi->maxtemp = temperature;
769 /* Smoothing function: 5-point triangular smooth */
770 for (i = 2; i < nr; i++) {
771 struct plot_data *entry = pi->entry+i;
775 depth = entry[-2].depth + 2*entry[-1].depth + 3*entry[0].depth + 2*entry[1].depth + entry[2].depth;
776 entry->smoothed = (depth+4) / 9;
778 /* vertical velocity in mm/sec */
779 /* Linus wants to smooth this - let's at least look at the samples that aren't FAST or CRAZY */
780 if (entry[0].sec - entry[-1].sec) {
781 entry->velocity = velocity((entry[0].depth - entry[-1].depth) / (entry[0].sec - entry[-1].sec));
782 /* if our samples are short and we aren't too FAST*/
783 if (entry[0].sec - entry[-1].sec < 15 && entry->velocity < FAST) {
785 while (i+past > 0 && entry[0].sec - entry[past].sec < 15)
787 entry->velocity = velocity((entry[0].depth - entry[past].depth) /
788 (entry[0].sec - entry[past].sec));
791 entry->velocity = STABLE;
794 /* One-, two- and three-minute minmax data */
795 for (i = 0; i < nr; i++) {
796 struct plot_data *entry = pi->entry +i;
797 analyze_plot_info_minmax(entry, pi->entry, pi->entry+nr);
804 * simple structure to track the beginning and end tank pressure as
805 * well as the integral of depth over time spent while we have no
806 * pressure reading from the tank */
807 typedef struct pr_track_struct pr_track_t;
808 struct pr_track_struct {
813 double pressure_time;
817 static pr_track_t *pr_track_alloc(int start, int t_start) {
818 pr_track_t *pt = malloc(sizeof(pr_track_t));
820 pt->t_start = t_start;
823 pt->pressure_time = 0.0;
828 /* poor man's linked list */
829 static pr_track_t *list_last(pr_track_t *list)
831 pr_track_t *tail = list;
840 static pr_track_t *list_add(pr_track_t *list, pr_track_t *element)
842 pr_track_t *tail = list_last(list);
845 tail->next = element;
849 static void list_free(pr_track_t *list)
853 list_free(list->next);
857 static void fill_missing_tank_pressures(struct dive *dive, struct plot_info *pi,
858 pr_track_t **track_pr)
860 pr_track_t *list = NULL;
861 pr_track_t *nlist = NULL;
864 struct plot_data *entry;
865 int cur_pr[MAX_CYLINDERS];
867 for (cyl = 0; cyl < MAX_CYLINDERS; cyl++) {
868 cur_pr[cyl] = track_pr[cyl]->start;
870 for (i = 0; i < dive->samples; i++) {
871 entry = pi->entry + i + 2;
872 if (SENSOR_PRESSURE(entry)) {
873 cur_pr[entry->cylinderindex] = SENSOR_PRESSURE(entry);
875 if(!list || list->t_end < entry->sec) {
876 nlist = track_pr[entry->cylinderindex];
878 while (nlist && nlist->t_start <= entry->sec) {
882 /* there may be multiple segments - so
883 * let's assemble the length */
885 pt = list->pressure_time;
886 while (!nlist->end) {
889 /* oops - we have no end pressure,
890 * so this means this is a tank without
891 * gas consumption information */
894 pt += nlist->pressure_time;
897 /* just continue without calculating
898 * interpolated values */
902 magic = (nlist->end - cur_pr[entry->cylinderindex]) / pt; }
904 double cur_pt = (entry->sec - (entry-1)->sec) *
905 (1 + entry->depth / 10000.0);
906 INTERPOLATED_PRESSURE(entry) =
907 cur_pr[entry->cylinderindex] + cur_pt * magic;
908 cur_pr[entry->cylinderindex] = INTERPOLATED_PRESSURE(entry);
914 static int get_cylinder_index(struct dive *dive, struct event *ev)
919 * Try to find a cylinder that matches the O2 percentage
920 * in the gas change event 'value' field.
922 * Crazy suunto gas change events. We really should do
923 * this in libdivecomputer or something.
925 for (i = 0; i < MAX_CYLINDERS; i++) {
926 cylinder_t *cyl = dive->cylinder+i;
927 int o2 = (cyl->gasmix.o2.permille + 5) / 10;
935 static struct event *get_next_gaschange(struct event *event)
938 if (!strcmp(event->name, "gaschange"))
945 static int set_cylinder_index(struct plot_info *pi, int i, int cylinderindex, unsigned int end)
948 struct plot_data *entry = pi->entry+i;
949 if (entry->sec > end)
951 if (entry->cylinderindex != cylinderindex) {
952 entry->cylinderindex = cylinderindex;
953 entry->pressure[0] = 0;
960 static void check_gas_change_events(struct dive *dive, struct plot_info *pi)
962 int i = 0, cylinderindex = 0;
963 struct event *ev = get_next_gaschange(dive->events);
969 i = set_cylinder_index(pi, i, cylinderindex, ev->time.seconds);
970 cylinderindex = get_cylinder_index(dive, ev);
971 ev = get_next_gaschange(ev->next);
973 set_cylinder_index(pi, i, cylinderindex, ~0u);
977 * Create a plot-info with smoothing and ranged min/max
979 * This also makes sure that we have extra empty events on both
980 * sides, so that you can do end-points without having to worry
983 static struct plot_info *create_plot_info(struct dive *dive)
985 int cylinderindex = -1;
986 int lastdepth, lastindex;
987 int i, nr = dive->samples + 4, sec, cyl;
988 size_t alloc_size = plot_info_size(nr);
989 struct plot_info *pi;
990 pr_track_t *track_pr[MAX_CYLINDERS] = {NULL, };
991 pr_track_t *pr_track, *current;
992 gboolean missing_pr = FALSE;
993 struct plot_data *entry;
995 pi = malloc(alloc_size);
998 memset(pi, 0, alloc_size);
1003 for (i = 0; i < dive->samples; i++) {
1005 struct sample *sample = dive->sample+i;
1007 entry = pi->entry + i + 2;
1008 sec = entry->sec = sample->time.seconds;
1009 depth = entry->depth = sample->depth.mm;
1010 entry->cylinderindex = sample->cylinderindex;
1011 SENSOR_PRESSURE(entry) = sample->cylinderpressure.mbar;
1012 entry->temperature = sample->temperature.mkelvin;
1014 if (depth || lastdepth)
1018 if (depth > pi->maxdepth)
1019 pi->maxdepth = depth;
1022 check_gas_change_events(dive, pi);
1024 for (cyl = 0; cyl < MAX_CYLINDERS; cyl++) /* initialize the start pressures */
1025 track_pr[cyl] = pr_track_alloc(dive->cylinder[cyl].start.mbar, -1);
1026 current = track_pr[dive->sample[0].cylinderindex];
1027 for (i = 0; i < dive->samples; i++) {
1028 entry = pi->entry + i + 2;
1030 entry->same_cylinder = entry->cylinderindex == cylinderindex;
1031 cylinderindex = entry->cylinderindex;
1033 /* track the segments per cylinder and their pressure/time integral */
1034 if (!entry->same_cylinder) {
1035 current->end = SENSOR_PRESSURE(entry-1);
1036 current->t_end = (entry-1)->sec;
1037 current = pr_track_alloc(SENSOR_PRESSURE(entry), entry->sec);
1038 track_pr[cylinderindex] = list_add(track_pr[cylinderindex], current);
1039 } else { /* same cylinder */
1040 if ((!SENSOR_PRESSURE(entry) && SENSOR_PRESSURE(entry-1)) ||
1041 (SENSOR_PRESSURE(entry) && !SENSOR_PRESSURE(entry-1))) {
1042 /* transmitter changed its working status */
1043 current->end = SENSOR_PRESSURE(entry-1);
1044 current->t_end = (entry-1)->sec;
1045 current = pr_track_alloc(SENSOR_PRESSURE(entry), entry->sec);
1046 track_pr[cylinderindex] =
1047 list_add(track_pr[cylinderindex], current);
1050 /* finally, do the discrete integration to get the SAC rate equivalent */
1051 current->pressure_time += (entry->sec - (entry-1)->sec) *
1052 (1 + entry->depth / 10000.0);
1053 missing_pr |= !SENSOR_PRESSURE(entry);
1056 current->t_end = entry->sec;
1057 for (cyl = 0; cyl < MAX_CYLINDERS; cyl++) { /* initialize the end pressures */
1058 int pr = dive->cylinder[cyl].end.mbar;
1059 if (pr && track_pr[cyl]) {
1060 pr_track = list_last(track_pr[cyl]);
1066 /* Fill in the last two entries with empty values but valid times */
1067 i = dive->samples + 2;
1068 pi->entry[i].sec = sec + 20;
1069 pi->entry[i+1].sec = sec + 40;
1070 pi->nr = lastindex+1;
1071 pi->maxtime = pi->entry[lastindex].sec;
1073 pi->endpressure = pi->minpressure = dive->cylinder[0].end.mbar;
1074 pi->maxpressure = dive->cylinder[0].start.mbar;
1076 pi->meandepth = dive->meandepth.mm;
1079 fill_missing_tank_pressures(dive, pi, track_pr);
1081 for (cyl = 0; cyl < MAX_CYLINDERS; cyl++)
1082 list_free(track_pr[cyl]);
1083 return analyze_plot_info(pi);
1086 void plot(struct graphics_context *gc, cairo_rectangle_int_t *drawing_area, struct dive *dive)
1088 struct plot_info *pi = create_plot_info(dive);
1090 cairo_translate(gc->cr, drawing_area->x, drawing_area->y);
1091 cairo_set_line_width(gc->cr, 2);
1092 cairo_set_line_cap(gc->cr, CAIRO_LINE_CAP_ROUND);
1093 cairo_set_line_join(gc->cr, CAIRO_LINE_JOIN_ROUND);
1096 * We can use "cairo_translate()" because that doesn't
1097 * scale line width etc. But the actual scaling we need
1098 * do set up ourselves..
1100 * Snif. What a pity.
1102 gc->maxx = (drawing_area->width - 2*drawing_area->x);
1103 gc->maxy = (drawing_area->height - 2*drawing_area->y);
1105 /* Temperature profile */
1106 plot_temperature_profile(gc, pi);
1108 /* Cylinder pressure plot */
1109 plot_cylinder_pressure(gc, pi);
1112 plot_depth_profile(gc, pi);
1113 plot_events(gc, pi, dive);
1115 /* Text on top of all graphs.. */
1116 plot_temperature_text(gc, pi);
1117 plot_depth_text(gc, pi);
1118 plot_cylinder_pressure_text(gc, pi);
1120 /* Bounding box last */
1121 gc->leftx = 0; gc->rightx = 1.0;
1122 gc->topy = 0; gc->bottomy = 1.0;
1124 set_source_rgb(gc, 1, 1, 1);
1129 cairo_close_path(gc->cr);
1130 cairo_stroke(gc->cr);