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 evn_foreach(void (*callback)(const char *, int *, void *), void *data)
181 for (i = 0; i < evn_used; i++) {
182 callback(ev_namelist[i].ev_name, &ev_namelist[i].plot_ev, data);
186 void remember_event(const char *eventname)
190 if (!eventname || (len = strlen(eventname)) == 0)
192 while (i < evn_used) {
193 if (!strncmp(eventname,ev_namelist[i].ev_name,len))
197 if (evn_used == evn_allocated) {
199 ev_namelist = realloc(ev_namelist, evn_allocated * sizeof(struct ev_select));
201 /* we are screwed, but let's just bail out */
204 ev_namelist[evn_used].ev_name = strdup(eventname);
205 ev_namelist[evn_used].plot_ev = TRUE;
209 static void plot_one_event(struct graphics_context *gc, struct plot_info *pi, struct event *event, const text_render_options_t *tro)
214 /* is plotting this event disabled? */
216 for (i = 0; i < evn_used; i++) {
217 if (! strcmp(event->name, ev_namelist[i].ev_name)) {
218 if (ev_namelist[i].plot_ev)
225 for (i = 0; i < pi->nr; i++) {
226 struct plot_data *data = pi->entry + i;
227 if (event->time.seconds < data->sec)
231 /* draw a little tirangular marker and attach tooltip */
232 x = SCALEX(gc, event->time.seconds);
233 y = SCALEY(gc, depth);
234 set_source_rgba(gc, 1.0, 1.0, 0.1, 0.8);
235 cairo_move_to(gc->cr, x-15, y+6);
236 cairo_line_to(gc->cr, x-3 , y+6);
237 cairo_line_to(gc->cr, x-9, y-6);
238 cairo_line_to(gc->cr, x-15, y+6);
239 cairo_stroke_preserve(gc->cr);
241 set_source_rgba(gc, 0.0, 0.0, 0.0, 0.8);
242 cairo_move_to(gc->cr, x-9, y-3);
243 cairo_line_to(gc->cr, x-9, y+1);
244 cairo_move_to(gc->cr, x-9, y+4);
245 cairo_line_to(gc->cr, x-9, y+4);
246 cairo_stroke(gc->cr);
247 attach_tooltip(x-15, y-6, 12, 12, event->name);
250 static void plot_events(struct graphics_context *gc, struct plot_info *pi, struct dive *dive)
252 static const text_render_options_t tro = {14, 1.0, 0.2, 0.2, CENTER, TOP};
253 struct event *event = dive->events;
259 plot_one_event(gc, pi, event, &tro);
264 static void render_depth_sample(struct graphics_context *gc, struct plot_data *entry, const text_render_options_t *tro)
266 int sec = entry->sec, decimals;
269 d = get_depth_units(entry->depth, &decimals, NULL);
271 plot_text(gc, tro, sec, entry->depth, "%.*f", decimals, d);
274 static void plot_text_samples(struct graphics_context *gc, struct plot_info *pi)
276 static const text_render_options_t deep = {14, 1.0, 0.2, 0.2, CENTER, TOP};
277 static const text_render_options_t shallow = {14, 1.0, 0.2, 0.2, CENTER, BOTTOM};
280 for (i = 0; i < pi->nr; i++) {
281 struct plot_data *entry = pi->entry + i;
283 if (entry->depth < 2000)
286 if (entry == entry->max[2])
287 render_depth_sample(gc, entry, &deep);
289 if (entry == entry->min[2])
290 render_depth_sample(gc, entry, &shallow);
294 static void plot_depth_text(struct graphics_context *gc, struct plot_info *pi)
296 int maxtime, maxdepth;
298 /* Get plot scaling limits */
299 maxtime = get_maxtime(pi);
300 maxdepth = get_maxdepth(pi);
302 gc->leftx = 0; gc->rightx = maxtime;
303 gc->topy = 0; gc->bottomy = maxdepth;
305 plot_text_samples(gc, pi);
308 static void plot_smoothed_profile(struct graphics_context *gc, struct plot_info *pi)
311 struct plot_data *entry = pi->entry;
313 set_source_rgba(gc, 1, 0.2, 0.2, 0.20);
314 move_to(gc, entry->sec, entry->smoothed);
315 for (i = 1; i < pi->nr; i++) {
317 line_to(gc, entry->sec, entry->smoothed);
319 cairo_stroke(gc->cr);
322 static void plot_minmax_profile_minute(struct graphics_context *gc, struct plot_info *pi,
326 struct plot_data *entry = pi->entry;
328 set_source_rgba(gc, 1, 0.2, 1, a);
329 move_to(gc, entry->sec, entry->min[index]->depth);
330 for (i = 1; i < pi->nr; i++) {
332 line_to(gc, entry->sec, entry->min[index]->depth);
334 for (i = 1; i < pi->nr; i++) {
335 line_to(gc, entry->sec, entry->max[index]->depth);
338 cairo_close_path(gc->cr);
342 static void plot_minmax_profile(struct graphics_context *gc, struct plot_info *pi)
346 plot_minmax_profile_minute(gc, pi, 2, 0.1);
347 plot_minmax_profile_minute(gc, pi, 1, 0.1);
348 plot_minmax_profile_minute(gc, pi, 0, 0.1);
351 static void plot_depth_profile(struct graphics_context *gc, struct plot_info *pi)
354 cairo_t *cr = gc->cr;
356 struct plot_data *entry;
357 int maxtime, maxdepth, marker;
358 int increments[4] = { 5*60, 10*60, 15*60, 30*60 };
360 /* Get plot scaling limits */
361 maxtime = get_maxtime(pi);
362 maxdepth = get_maxdepth(pi);
364 /* Time markers: at most every 5 min, but no more than 12 markers
365 * and for convenience we do 5, 10, 15 or 30 min intervals.
366 * This allows for 6h dives - enough (I hope) for even the craziest
367 * divers - but just in case, for those 8h depth-record-breaking dives,
368 * we double the interval if this still doesn't get us to 12 or fewer
371 while (maxtime / increments[i] > 12 && i < 4)
373 incr = increments[i];
374 while (maxtime / incr > 12)
377 gc->leftx = 0; gc->rightx = maxtime;
378 gc->topy = 0; gc->bottomy = 1.0;
379 set_source_rgba(gc, 1, 1, 1, 0.5);
380 for (i = incr; i < maxtime; i += incr) {
386 /* now the text on every second time marker */
387 text_render_options_t tro = {10, 0.2, 1.0, 0.2, CENTER, TOP};
388 for (i = incr; i < maxtime; i += 2 * incr)
389 plot_text(gc, &tro, i, 1, "%d", i/60);
391 /* Depth markers: every 30 ft or 10 m*/
392 gc->leftx = 0; gc->rightx = 1.0;
393 gc->topy = 0; gc->bottomy = maxdepth;
394 switch (output_units.length) {
395 case METERS: marker = 10000; break;
396 case FEET: marker = 9144; break; /* 30 ft */
399 set_source_rgba(gc, 1, 1, 1, 0.5);
400 for (i = marker; i < maxdepth; i += marker) {
406 /* Show mean depth */
408 set_source_rgba(gc, 1, 0.2, 0.2, 0.40);
409 move_to(gc, 0, pi->meandepth);
410 line_to(gc, 1, pi->meandepth);
414 gc->leftx = 0; gc->rightx = maxtime;
417 * These are good for debugging text placement etc,
418 * but not for actual display..
421 plot_smoothed_profile(gc, pi);
422 plot_minmax_profile(gc, pi);
425 set_source_rgba(gc, 1, 0.2, 0.2, 0.80);
427 /* Do the depth profile for the neat fill */
428 gc->topy = 0; gc->bottomy = maxdepth;
429 set_source_rgba(gc, 1, 0.2, 0.2, 0.20);
433 for (i = 0; i < pi->nr; i++, entry++)
434 line_to(gc, entry->sec, entry->depth);
435 cairo_close_path(gc->cr);
437 set_source_rgba(gc, 1, 1, 1, 0.2);
438 cairo_fill_preserve(cr);
439 set_source_rgb(gc, 1, 1, 1);
445 /* Now do it again for the velocity colors */
447 for (i = 1; i < pi->nr; i++) {
450 /* we want to draw the segments in different colors
451 * representing the vertical velocity, so we need to
452 * chop this into short segments */
453 rgb_t color = rgb[entry->velocity];
454 depth = entry->depth;
455 set_source_rgb(gc, color.r, color.g, color.b);
456 move_to(gc, entry[-1].sec, entry[-1].depth);
457 line_to(gc, sec, depth);
462 static int setup_temperature_limits(struct graphics_context *gc, struct plot_info *pi)
464 int maxtime, mintemp, maxtemp, delta;
466 /* Get plot scaling limits */
467 maxtime = get_maxtime(pi);
468 mintemp = pi->mintemp;
469 maxtemp = pi->maxtemp;
471 gc->leftx = 0; gc->rightx = maxtime;
472 /* Show temperatures in roughly the lower third, but make sure the scale
473 is at least somewhat reasonable */
474 delta = maxtemp - mintemp;
475 if (delta > 3000) { /* more than 3K in fluctuation */
476 gc->topy = maxtemp + delta*2;
477 gc->bottomy = mintemp - delta/2;
479 gc->topy = maxtemp + 1500 + delta*2;
480 gc->bottomy = mintemp - delta/2;
483 return maxtemp > mintemp;
486 static void plot_single_temp_text(struct graphics_context *gc, int sec, int mkelvin)
490 static const text_render_options_t tro = {12, 0.2, 0.2, 1.0, LEFT, TOP};
492 deg = get_temp_units(mkelvin, &unit);
494 plot_text(gc, &tro, sec, mkelvin, "%d%s", (int)(deg + 0.5), unit);
497 static void plot_temperature_text(struct graphics_context *gc, struct plot_info *pi)
500 int last = 0, sec = 0;
501 int last_temperature = 0, last_printed_temp = 0;
503 if (!setup_temperature_limits(gc, pi))
506 for (i = 0; i < pi->nr; i++) {
507 struct plot_data *entry = pi->entry+i;
508 int mkelvin = entry->temperature;
512 last_temperature = mkelvin;
514 if (sec < last + 300)
517 plot_single_temp_text(gc,sec,mkelvin);
518 last_printed_temp = mkelvin;
520 /* it would be nice to print the end temperature, if it's different */
521 if (abs(last_temperature - last_printed_temp) > 500)
522 plot_single_temp_text(gc, sec, last_temperature);
525 static void plot_temperature_profile(struct graphics_context *gc, struct plot_info *pi)
528 cairo_t *cr = gc->cr;
531 if (!setup_temperature_limits(gc, pi))
534 set_source_rgba(gc, 0.2, 0.2, 1.0, 0.8);
535 for (i = 0; i < pi->nr; i++) {
536 struct plot_data *entry = pi->entry + i;
537 int mkelvin = entry->temperature;
538 int sec = entry->sec;
545 line_to(gc, sec, mkelvin);
547 move_to(gc, sec, mkelvin);
553 /* gets both the actual start and end pressure as well as the scaling factors */
554 static int get_cylinder_pressure_range(struct graphics_context *gc, struct plot_info *pi)
557 gc->rightx = get_maxtime(pi);
559 gc->bottomy = 0; gc->topy = pi->maxpressure * 1.5;
560 return pi->maxpressure != 0;
563 static void plot_pressure_helper(struct graphics_context *gc, struct plot_info *pi, int type)
566 int lift_pen = FALSE;
568 for (i = 0; i < pi->nr; i++) {
570 struct plot_data *entry = pi->entry + i;
572 mbar = entry->pressure[type];
573 if (!entry->same_cylinder)
580 if (i > 0 && entry->same_cylinder) {
581 /* if we have a previous event from the same tank,
582 * draw at least a short line .
583 * This uses the implementation detail that the
584 * type is either 0 or 1 */
586 prev_pr = (entry-1)->pressure[type] ? : (entry-1)->pressure[1 - type];
587 move_to(gc, (entry-1)->sec, prev_pr);
588 line_to(gc, entry->sec, mbar);
590 move_to(gc, entry->sec, mbar);
594 line_to(gc, entry->sec, mbar);
596 cairo_stroke(gc->cr);
600 static void plot_cylinder_pressure(struct graphics_context *gc, struct plot_info *pi)
602 if (!get_cylinder_pressure_range(gc, pi))
605 /* first plot the pressure readings we have from the dive computer */
606 set_source_rgba(gc, 0.2, 1.0, 0.2, 0.80);
607 plot_pressure_helper(gc, pi, SENSOR_PR);
609 /* then, in a different color, the interpolated values */
610 set_source_rgba(gc, 1.0, 1.0, 0.2, 0.80);
611 plot_pressure_helper(gc, pi, INTERPOLATED_PR);
614 static int mbar_to_PSI(int mbar)
616 pressure_t p = {mbar};
620 static void plot_pressure_value(struct graphics_context *gc, int mbar, int sec,
621 int xalign, int yalign)
626 switch (output_units.pressure) {
628 pressure = mbar * 100;
632 pressure = (mbar + 500) / 1000;
636 pressure = mbar_to_PSI(mbar);
640 text_render_options_t tro = {10, 0.2, 1.0, 0.2, xalign, yalign};
641 plot_text(gc, &tro, sec, mbar, "%d %s", pressure, unit);
644 static void plot_cylinder_pressure_text(struct graphics_context *gc, struct plot_info *pi)
648 int seen_cyl[MAX_CYLINDERS] = { FALSE, };
649 int last_pressure[MAX_CYLINDERS] = { 0, };
650 int last_time[MAX_CYLINDERS] = { 0, };
651 struct plot_data *entry;
653 if (!get_cylinder_pressure_range(gc, pi))
656 /* only loop over the actual events from the dive computer */
657 for (i = 2; i < pi->nr; i++) {
658 entry = pi->entry + i;
660 if (!entry->same_cylinder) {
661 cyl = entry->cylinderindex;
662 if (!seen_cyl[cyl]) {
663 mbar = SENSOR_PRESSURE(entry) ? : INTERPOLATED_PRESSURE(entry);
664 plot_pressure_value(gc, mbar, entry->sec, LEFT, BOTTOM);
665 seen_cyl[cyl] = TRUE;
668 /* remember the last pressure and time of
669 * the previous cylinder */
670 cyl = (entry - 1)->cylinderindex;
672 SENSOR_PRESSURE(entry - 1) ? : INTERPOLATED_PRESSURE(entry - 1);
673 last_time[cyl] = (entry - 1)->sec;
677 cyl = entry->cylinderindex;
678 last_pressure[cyl] = SENSOR_PRESSURE(entry) ? : INTERPOLATED_PRESSURE(entry);
679 last_time[cyl] = entry->sec;
681 for (cyl = 0; cyl < MAX_CYLINDERS; cyl++) {
682 if (last_time[cyl]) {
683 plot_pressure_value(gc, last_pressure[cyl], last_time[cyl], CENTER, TOP);
688 static void analyze_plot_info_minmax_minute(struct plot_data *entry, struct plot_data *first, struct plot_data *last, int index)
690 struct plot_data *p = entry;
691 int time = entry->sec;
692 int seconds = 90*(index+1);
693 struct plot_data *min, *max;
696 /* Go back 'seconds' in time */
698 if (p[-1].sec < time - seconds)
703 /* Then go forward until we hit an entry past the time */
708 int depth = p->depth;
709 if (p->sec > time + seconds)
713 if (depth < min->depth)
715 if (depth > max->depth)
718 entry->min[index] = min;
719 entry->max[index] = max;
720 entry->avg[index] = (avg + nr/2) / nr;
723 static void analyze_plot_info_minmax(struct plot_data *entry, struct plot_data *first, struct plot_data *last)
725 analyze_plot_info_minmax_minute(entry, first, last, 0);
726 analyze_plot_info_minmax_minute(entry, first, last, 1);
727 analyze_plot_info_minmax_minute(entry, first, last, 2);
730 static velocity_t velocity(int speed)
734 if (speed < -304) /* ascent faster than -60ft/min */
736 else if (speed < -152) /* above -30ft/min */
738 else if (speed < -76) /* -15ft/min */
740 else if (speed < -25) /* -5ft/min */
742 else if (speed < 25) /* very hard to find data, but it appears that the recommendations
743 for descent are usually about 2x ascent rate; still, we want
744 stable to mean stable */
746 else if (speed < 152) /* between 5 and 30ft/min is considered slow */
748 else if (speed < 304) /* up to 60ft/min is moderate */
750 else if (speed < 507) /* up to 100ft/min is fast */
752 else /* more than that is just crazy - you'll blow your ears out */
757 static struct plot_info *analyze_plot_info(struct plot_info *pi)
762 /* Do pressure min/max based on the non-surface data */
763 for (i = 0; i < nr; i++) {
764 struct plot_data *entry = pi->entry+i;
765 int pressure = SENSOR_PRESSURE(entry) ? : INTERPOLATED_PRESSURE(entry);
766 int temperature = entry->temperature;
769 if (!pi->minpressure || pressure < pi->minpressure)
770 pi->minpressure = pressure;
771 if (pressure > pi->maxpressure)
772 pi->maxpressure = pressure;
776 if (!pi->mintemp || temperature < pi->mintemp)
777 pi->mintemp = temperature;
778 if (temperature > pi->maxtemp)
779 pi->maxtemp = temperature;
783 /* Smoothing function: 5-point triangular smooth */
784 for (i = 2; i < nr; i++) {
785 struct plot_data *entry = pi->entry+i;
789 depth = entry[-2].depth + 2*entry[-1].depth + 3*entry[0].depth + 2*entry[1].depth + entry[2].depth;
790 entry->smoothed = (depth+4) / 9;
792 /* vertical velocity in mm/sec */
793 /* Linus wants to smooth this - let's at least look at the samples that aren't FAST or CRAZY */
794 if (entry[0].sec - entry[-1].sec) {
795 entry->velocity = velocity((entry[0].depth - entry[-1].depth) / (entry[0].sec - entry[-1].sec));
796 /* if our samples are short and we aren't too FAST*/
797 if (entry[0].sec - entry[-1].sec < 15 && entry->velocity < FAST) {
799 while (i+past > 0 && entry[0].sec - entry[past].sec < 15)
801 entry->velocity = velocity((entry[0].depth - entry[past].depth) /
802 (entry[0].sec - entry[past].sec));
805 entry->velocity = STABLE;
808 /* One-, two- and three-minute minmax data */
809 for (i = 0; i < nr; i++) {
810 struct plot_data *entry = pi->entry +i;
811 analyze_plot_info_minmax(entry, pi->entry, pi->entry+nr);
818 * simple structure to track the beginning and end tank pressure as
819 * well as the integral of depth over time spent while we have no
820 * pressure reading from the tank */
821 typedef struct pr_track_struct pr_track_t;
822 struct pr_track_struct {
827 double pressure_time;
831 static pr_track_t *pr_track_alloc(int start, int t_start) {
832 pr_track_t *pt = malloc(sizeof(pr_track_t));
834 pt->t_start = t_start;
837 pt->pressure_time = 0.0;
842 /* poor man's linked list */
843 static pr_track_t *list_last(pr_track_t *list)
845 pr_track_t *tail = list;
854 static pr_track_t *list_add(pr_track_t *list, pr_track_t *element)
856 pr_track_t *tail = list_last(list);
859 tail->next = element;
863 static void list_free(pr_track_t *list)
867 list_free(list->next);
871 static void fill_missing_tank_pressures(struct dive *dive, struct plot_info *pi,
872 pr_track_t **track_pr)
874 pr_track_t *list = NULL;
875 pr_track_t *nlist = NULL;
878 struct plot_data *entry;
879 int cur_pr[MAX_CYLINDERS];
881 for (cyl = 0; cyl < MAX_CYLINDERS; cyl++) {
882 cur_pr[cyl] = track_pr[cyl]->start;
885 /* The first two are "fillers" */
886 for (i = 2; i < pi->nr; i++) {
887 entry = pi->entry + i;
888 if (SENSOR_PRESSURE(entry)) {
889 cur_pr[entry->cylinderindex] = SENSOR_PRESSURE(entry);
891 if(!list || list->t_end < entry->sec) {
892 nlist = track_pr[entry->cylinderindex];
894 while (nlist && nlist->t_start <= entry->sec) {
898 /* there may be multiple segments - so
899 * let's assemble the length */
901 pt = list->pressure_time;
902 while (!nlist->end) {
905 /* oops - we have no end pressure,
906 * so this means this is a tank without
907 * gas consumption information */
910 pt += nlist->pressure_time;
913 /* just continue without calculating
914 * interpolated values */
918 magic = (nlist->end - cur_pr[entry->cylinderindex]) / pt; }
920 double cur_pt = (entry->sec - (entry-1)->sec) *
921 (1 + entry->depth / 10000.0);
922 INTERPOLATED_PRESSURE(entry) =
923 cur_pr[entry->cylinderindex] + cur_pt * magic;
924 cur_pr[entry->cylinderindex] = INTERPOLATED_PRESSURE(entry);
930 static int get_cylinder_index(struct dive *dive, struct event *ev)
935 * Try to find a cylinder that matches the O2 percentage
936 * in the gas change event 'value' field.
938 * Crazy suunto gas change events. We really should do
939 * this in libdivecomputer or something.
941 for (i = 0; i < MAX_CYLINDERS; i++) {
942 cylinder_t *cyl = dive->cylinder+i;
943 int o2 = (cyl->gasmix.o2.permille + 5) / 10;
951 static struct event *get_next_gaschange(struct event *event)
954 if (!strcmp(event->name, "gaschange"))
961 static int set_cylinder_index(struct plot_info *pi, int i, int cylinderindex, unsigned int end)
964 struct plot_data *entry = pi->entry+i;
965 if (entry->sec > end)
967 if (entry->cylinderindex != cylinderindex) {
968 entry->cylinderindex = cylinderindex;
969 entry->pressure[0] = 0;
976 static void check_gas_change_events(struct dive *dive, struct plot_info *pi)
978 int i = 0, cylinderindex = 0;
979 struct event *ev = get_next_gaschange(dive->events);
985 i = set_cylinder_index(pi, i, cylinderindex, ev->time.seconds);
986 cylinderindex = get_cylinder_index(dive, ev);
987 ev = get_next_gaschange(ev->next);
989 set_cylinder_index(pi, i, cylinderindex, ~0u);
993 * Create a plot-info with smoothing and ranged min/max
995 * This also makes sure that we have extra empty events on both
996 * sides, so that you can do end-points without having to worry
999 static struct plot_info *create_plot_info(struct dive *dive, int nr_samples, struct sample *dive_sample)
1001 int cylinderindex = -1;
1002 int lastdepth, lastindex;
1003 int i, nr = nr_samples + 4, sec, cyl;
1004 size_t alloc_size = plot_info_size(nr);
1005 struct plot_info *pi;
1006 pr_track_t *track_pr[MAX_CYLINDERS] = {NULL, };
1007 pr_track_t *pr_track, *current;
1008 gboolean missing_pr = FALSE;
1009 struct plot_data *entry = NULL;
1011 pi = malloc(alloc_size);
1014 memset(pi, 0, alloc_size);
1019 for (i = 0; i < nr_samples; i++) {
1021 struct sample *sample = dive_sample+i;
1023 entry = pi->entry + i + 2;
1024 sec = entry->sec = sample->time.seconds;
1025 depth = entry->depth = sample->depth.mm;
1026 entry->cylinderindex = sample->cylinderindex;
1027 SENSOR_PRESSURE(entry) = sample->cylinderpressure.mbar;
1028 entry->temperature = sample->temperature.mkelvin;
1030 if (depth || lastdepth)
1034 if (depth > pi->maxdepth)
1035 pi->maxdepth = depth;
1038 check_gas_change_events(dive, pi);
1040 for (cyl = 0; cyl < MAX_CYLINDERS; cyl++) /* initialize the start pressures */
1041 track_pr[cyl] = pr_track_alloc(dive->cylinder[cyl].start.mbar, -1);
1042 current = track_pr[pi->entry[2].cylinderindex];
1043 for (i = 0; i < nr_samples; i++) {
1044 entry = pi->entry + i + 2;
1046 entry->same_cylinder = entry->cylinderindex == cylinderindex;
1047 cylinderindex = entry->cylinderindex;
1049 /* track the segments per cylinder and their pressure/time integral */
1050 if (!entry->same_cylinder) {
1051 current->end = SENSOR_PRESSURE(entry-1);
1052 current->t_end = (entry-1)->sec;
1053 current = pr_track_alloc(SENSOR_PRESSURE(entry), entry->sec);
1054 track_pr[cylinderindex] = list_add(track_pr[cylinderindex], current);
1055 } else { /* same cylinder */
1056 if ((!SENSOR_PRESSURE(entry) && SENSOR_PRESSURE(entry-1)) ||
1057 (SENSOR_PRESSURE(entry) && !SENSOR_PRESSURE(entry-1))) {
1058 /* transmitter changed its working status */
1059 current->end = SENSOR_PRESSURE(entry-1);
1060 current->t_end = (entry-1)->sec;
1061 current = pr_track_alloc(SENSOR_PRESSURE(entry), entry->sec);
1062 track_pr[cylinderindex] =
1063 list_add(track_pr[cylinderindex], current);
1066 /* finally, do the discrete integration to get the SAC rate equivalent */
1067 current->pressure_time += (entry->sec - (entry-1)->sec) *
1068 (1 + entry->depth / 10000.0);
1069 missing_pr |= !SENSOR_PRESSURE(entry);
1073 current->t_end = entry->sec;
1075 for (cyl = 0; cyl < MAX_CYLINDERS; cyl++) { /* initialize the end pressures */
1076 int pr = dive->cylinder[cyl].end.mbar;
1077 if (pr && track_pr[cyl]) {
1078 pr_track = list_last(track_pr[cyl]);
1082 /* Fill in the last two entries with empty values but valid times */
1084 pi->entry[i].sec = sec + 20;
1085 pi->entry[i+1].sec = sec + 40;
1086 pi->nr = lastindex+1;
1087 pi->maxtime = pi->entry[lastindex].sec;
1089 pi->endpressure = pi->minpressure = dive->cylinder[0].end.mbar;
1090 pi->maxpressure = dive->cylinder[0].start.mbar;
1092 pi->meandepth = dive->meandepth.mm;
1095 fill_missing_tank_pressures(dive, pi, track_pr);
1097 for (cyl = 0; cyl < MAX_CYLINDERS; cyl++)
1098 list_free(track_pr[cyl]);
1099 return analyze_plot_info(pi);
1102 void plot(struct graphics_context *gc, cairo_rectangle_int_t *drawing_area, struct dive *dive)
1104 struct plot_info *pi;
1105 static struct sample fake[4];
1106 struct sample *sample = dive->sample;
1107 int nr = dive->samples;
1110 int duration = dive->duration.seconds;
1111 int maxdepth = dive->maxdepth.mm;
1113 fake[1].time.seconds = duration * 0.05;
1114 fake[1].depth.mm = maxdepth;
1115 fake[2].time.seconds = duration * 0.95;
1116 fake[2].depth.mm = maxdepth;
1117 fake[3].time.seconds = duration * 1.00;
1121 pi = create_plot_info(dive, nr, sample);
1123 cairo_translate(gc->cr, drawing_area->x, drawing_area->y);
1124 cairo_set_line_width(gc->cr, 2);
1125 cairo_set_line_cap(gc->cr, CAIRO_LINE_CAP_ROUND);
1126 cairo_set_line_join(gc->cr, CAIRO_LINE_JOIN_ROUND);
1129 * We can use "cairo_translate()" because that doesn't
1130 * scale line width etc. But the actual scaling we need
1131 * do set up ourselves..
1133 * Snif. What a pity.
1135 gc->maxx = (drawing_area->width - 2*drawing_area->x);
1136 gc->maxy = (drawing_area->height - 2*drawing_area->y);
1138 /* Temperature profile */
1139 plot_temperature_profile(gc, pi);
1141 /* Cylinder pressure plot */
1142 plot_cylinder_pressure(gc, pi);
1145 plot_depth_profile(gc, pi);
1146 plot_events(gc, pi, dive);
1148 /* Text on top of all graphs.. */
1149 plot_temperature_text(gc, pi);
1150 plot_depth_text(gc, pi);
1151 plot_cylinder_pressure_text(gc, pi);
1153 /* Bounding box last */
1154 gc->leftx = 0; gc->rightx = 1.0;
1155 gc->topy = 0; gc->bottomy = 1.0;
1157 set_source_rgb(gc, 1, 1, 1);
1162 cairo_close_path(gc->cr);
1163 cairo_stroke(gc->cr);