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};
281 for (i = 0; i < pi->nr; i++) {
282 struct plot_data *entry = pi->entry + i;
284 if (entry->depth < 2000)
287 if ((entry == entry->max[2]) && entry->depth != last) {
288 render_depth_sample(gc, entry, &deep);
292 if ((entry == entry->min[2]) && entry->depth != last) {
293 render_depth_sample(gc, entry, &shallow);
297 if (entry->depth != last)
302 static void plot_depth_text(struct graphics_context *gc, struct plot_info *pi)
304 int maxtime, maxdepth;
306 /* Get plot scaling limits */
307 maxtime = get_maxtime(pi);
308 maxdepth = get_maxdepth(pi);
310 gc->leftx = 0; gc->rightx = maxtime;
311 gc->topy = 0; gc->bottomy = maxdepth;
313 plot_text_samples(gc, pi);
316 static void plot_smoothed_profile(struct graphics_context *gc, struct plot_info *pi)
319 struct plot_data *entry = pi->entry;
321 set_source_rgba(gc, 1, 0.2, 0.2, 0.20);
322 move_to(gc, entry->sec, entry->smoothed);
323 for (i = 1; i < pi->nr; i++) {
325 line_to(gc, entry->sec, entry->smoothed);
327 cairo_stroke(gc->cr);
330 static void plot_minmax_profile_minute(struct graphics_context *gc, struct plot_info *pi,
334 struct plot_data *entry = pi->entry;
336 set_source_rgba(gc, 1, 0.2, 1, a);
337 move_to(gc, entry->sec, entry->min[index]->depth);
338 for (i = 1; i < pi->nr; i++) {
340 line_to(gc, entry->sec, entry->min[index]->depth);
342 for (i = 1; i < pi->nr; i++) {
343 line_to(gc, entry->sec, entry->max[index]->depth);
346 cairo_close_path(gc->cr);
350 static void plot_minmax_profile(struct graphics_context *gc, struct plot_info *pi)
354 plot_minmax_profile_minute(gc, pi, 2, 0.1);
355 plot_minmax_profile_minute(gc, pi, 1, 0.1);
356 plot_minmax_profile_minute(gc, pi, 0, 0.1);
359 static void plot_depth_profile(struct graphics_context *gc, struct plot_info *pi)
362 cairo_t *cr = gc->cr;
364 struct plot_data *entry;
365 int maxtime, maxdepth, marker;
366 int increments[4] = { 5*60, 10*60, 15*60, 30*60 };
368 /* Get plot scaling limits */
369 maxtime = get_maxtime(pi);
370 maxdepth = get_maxdepth(pi);
372 /* Time markers: at most every 5 min, but no more than 12 markers
373 * and for convenience we do 5, 10, 15 or 30 min intervals.
374 * This allows for 6h dives - enough (I hope) for even the craziest
375 * divers - but just in case, for those 8h depth-record-breaking dives,
376 * we double the interval if this still doesn't get us to 12 or fewer
379 while (maxtime / increments[i] > 12 && i < 4)
381 incr = increments[i];
382 while (maxtime / incr > 12)
385 gc->leftx = 0; gc->rightx = maxtime;
386 gc->topy = 0; gc->bottomy = 1.0;
387 set_source_rgba(gc, 1, 1, 1, 0.5);
388 for (i = incr; i < maxtime; i += incr) {
394 /* now the text on every second time marker */
395 text_render_options_t tro = {10, 0.2, 1.0, 0.2, CENTER, TOP};
396 for (i = incr; i < maxtime; i += 2 * incr)
397 plot_text(gc, &tro, i, 1, "%d", i/60);
399 /* Depth markers: every 30 ft or 10 m*/
400 gc->leftx = 0; gc->rightx = 1.0;
401 gc->topy = 0; gc->bottomy = maxdepth;
402 switch (output_units.length) {
403 case METERS: marker = 10000; break;
404 case FEET: marker = 9144; break; /* 30 ft */
407 set_source_rgba(gc, 1, 1, 1, 0.5);
408 for (i = marker; i < maxdepth; i += marker) {
414 /* Show mean depth */
416 set_source_rgba(gc, 1, 0.2, 0.2, 0.40);
417 move_to(gc, 0, pi->meandepth);
418 line_to(gc, 1, pi->meandepth);
422 gc->leftx = 0; gc->rightx = maxtime;
425 * These are good for debugging text placement etc,
426 * but not for actual display..
429 plot_smoothed_profile(gc, pi);
430 plot_minmax_profile(gc, pi);
433 set_source_rgba(gc, 1, 0.2, 0.2, 0.80);
435 /* Do the depth profile for the neat fill */
436 gc->topy = 0; gc->bottomy = maxdepth;
437 set_source_rgba(gc, 1, 0.2, 0.2, 0.20);
441 for (i = 0; i < pi->nr; i++, entry++)
442 line_to(gc, entry->sec, entry->depth);
443 cairo_close_path(gc->cr);
445 set_source_rgba(gc, 1, 1, 1, 0.2);
446 cairo_fill_preserve(cr);
447 set_source_rgb(gc, 1, 1, 1);
453 /* Now do it again for the velocity colors */
455 for (i = 1; i < pi->nr; i++) {
458 /* we want to draw the segments in different colors
459 * representing the vertical velocity, so we need to
460 * chop this into short segments */
461 rgb_t color = rgb[entry->velocity];
462 depth = entry->depth;
463 set_source_rgb(gc, color.r, color.g, color.b);
464 move_to(gc, entry[-1].sec, entry[-1].depth);
465 line_to(gc, sec, depth);
470 static int setup_temperature_limits(struct graphics_context *gc, struct plot_info *pi)
472 int maxtime, mintemp, maxtemp, delta;
474 /* Get plot scaling limits */
475 maxtime = get_maxtime(pi);
476 mintemp = pi->mintemp;
477 maxtemp = pi->maxtemp;
479 gc->leftx = 0; gc->rightx = maxtime;
480 /* Show temperatures in roughly the lower third, but make sure the scale
481 is at least somewhat reasonable */
482 delta = maxtemp - mintemp;
483 if (delta > 3000) { /* more than 3K in fluctuation */
484 gc->topy = maxtemp + delta*2;
485 gc->bottomy = mintemp - delta/2;
487 gc->topy = maxtemp + 1500 + delta*2;
488 gc->bottomy = mintemp - delta/2;
491 return maxtemp > mintemp;
494 static void plot_single_temp_text(struct graphics_context *gc, int sec, int mkelvin)
498 static const text_render_options_t tro = {12, 0.2, 0.2, 1.0, LEFT, TOP};
500 deg = get_temp_units(mkelvin, &unit);
502 plot_text(gc, &tro, sec, mkelvin, "%d%s", (int)(deg + 0.5), unit);
505 static void plot_temperature_text(struct graphics_context *gc, struct plot_info *pi)
508 int last = 0, sec = 0;
509 int last_temperature = 0, last_printed_temp = 0;
511 if (!setup_temperature_limits(gc, pi))
514 for (i = 0; i < pi->nr; i++) {
515 struct plot_data *entry = pi->entry+i;
516 int mkelvin = entry->temperature;
520 last_temperature = mkelvin;
522 if (sec < last + 300)
525 plot_single_temp_text(gc,sec,mkelvin);
526 last_printed_temp = mkelvin;
528 /* it would be nice to print the end temperature, if it's different */
529 if (abs(last_temperature - last_printed_temp) > 500)
530 plot_single_temp_text(gc, sec, last_temperature);
533 static void plot_temperature_profile(struct graphics_context *gc, struct plot_info *pi)
536 cairo_t *cr = gc->cr;
539 if (!setup_temperature_limits(gc, pi))
542 set_source_rgba(gc, 0.2, 0.2, 1.0, 0.8);
543 for (i = 0; i < pi->nr; i++) {
544 struct plot_data *entry = pi->entry + i;
545 int mkelvin = entry->temperature;
546 int sec = entry->sec;
553 line_to(gc, sec, mkelvin);
555 move_to(gc, sec, mkelvin);
561 /* gets both the actual start and end pressure as well as the scaling factors */
562 static int get_cylinder_pressure_range(struct graphics_context *gc, struct plot_info *pi)
565 gc->rightx = get_maxtime(pi);
567 gc->bottomy = 0; gc->topy = pi->maxpressure * 1.5;
568 return pi->maxpressure != 0;
571 static void plot_pressure_helper(struct graphics_context *gc, struct plot_info *pi, int type)
574 int lift_pen = FALSE;
576 for (i = 0; i < pi->nr; i++) {
578 struct plot_data *entry = pi->entry + i;
580 mbar = entry->pressure[type];
581 if (!entry->same_cylinder)
588 if (i > 0 && entry->same_cylinder) {
589 /* if we have a previous event from the same tank,
590 * draw at least a short line .
591 * This uses the implementation detail that the
592 * type is either 0 or 1 */
594 prev_pr = (entry-1)->pressure[type] ? : (entry-1)->pressure[1 - type];
595 move_to(gc, (entry-1)->sec, prev_pr);
596 line_to(gc, entry->sec, mbar);
598 move_to(gc, entry->sec, mbar);
602 line_to(gc, entry->sec, mbar);
604 cairo_stroke(gc->cr);
608 static void plot_cylinder_pressure(struct graphics_context *gc, struct plot_info *pi)
610 if (!get_cylinder_pressure_range(gc, pi))
613 /* first plot the pressure readings we have from the dive computer */
614 set_source_rgba(gc, 0.2, 1.0, 0.2, 0.80);
615 plot_pressure_helper(gc, pi, SENSOR_PR);
617 /* then, in a different color, the interpolated values */
618 set_source_rgba(gc, 1.0, 1.0, 0.2, 0.80);
619 plot_pressure_helper(gc, pi, INTERPOLATED_PR);
622 static void plot_pressure_value(struct graphics_context *gc, int mbar, int sec,
623 int xalign, int yalign)
628 pressure = get_pressure_units(mbar, &unit);
629 text_render_options_t tro = {10, 0.2, 1.0, 0.2, xalign, yalign};
630 plot_text(gc, &tro, sec, mbar, "%d %s", pressure, unit);
633 static void plot_cylinder_pressure_text(struct graphics_context *gc, struct plot_info *pi)
637 int seen_cyl[MAX_CYLINDERS] = { FALSE, };
638 int last_pressure[MAX_CYLINDERS] = { 0, };
639 int last_time[MAX_CYLINDERS] = { 0, };
640 struct plot_data *entry;
642 if (!get_cylinder_pressure_range(gc, pi))
645 /* only loop over the actual events from the dive computer */
646 for (i = 2; i < pi->nr; i++) {
647 entry = pi->entry + i;
649 if (!entry->same_cylinder) {
650 cyl = entry->cylinderindex;
651 if (!seen_cyl[cyl]) {
652 mbar = SENSOR_PRESSURE(entry) ? : INTERPOLATED_PRESSURE(entry);
653 plot_pressure_value(gc, mbar, entry->sec, LEFT, BOTTOM);
654 seen_cyl[cyl] = TRUE;
657 /* remember the last pressure and time of
658 * the previous cylinder */
659 cyl = (entry - 1)->cylinderindex;
661 SENSOR_PRESSURE(entry - 1) ? : INTERPOLATED_PRESSURE(entry - 1);
662 last_time[cyl] = (entry - 1)->sec;
666 cyl = entry->cylinderindex;
667 last_pressure[cyl] = SENSOR_PRESSURE(entry) ? : INTERPOLATED_PRESSURE(entry);
668 last_time[cyl] = entry->sec;
670 for (cyl = 0; cyl < MAX_CYLINDERS; cyl++) {
671 if (last_time[cyl]) {
672 plot_pressure_value(gc, last_pressure[cyl], last_time[cyl], CENTER, TOP);
677 static void analyze_plot_info_minmax_minute(struct plot_data *entry, struct plot_data *first, struct plot_data *last, int index)
679 struct plot_data *p = entry;
680 int time = entry->sec;
681 int seconds = 90*(index+1);
682 struct plot_data *min, *max;
685 /* Go back 'seconds' in time */
687 if (p[-1].sec < time - seconds)
692 /* Then go forward until we hit an entry past the time */
697 int depth = p->depth;
698 if (p->sec > time + seconds)
702 if (depth < min->depth)
704 if (depth > max->depth)
707 entry->min[index] = min;
708 entry->max[index] = max;
709 entry->avg[index] = (avg + nr/2) / nr;
712 static void analyze_plot_info_minmax(struct plot_data *entry, struct plot_data *first, struct plot_data *last)
714 analyze_plot_info_minmax_minute(entry, first, last, 0);
715 analyze_plot_info_minmax_minute(entry, first, last, 1);
716 analyze_plot_info_minmax_minute(entry, first, last, 2);
719 static velocity_t velocity(int speed)
723 if (speed < -304) /* ascent faster than -60ft/min */
725 else if (speed < -152) /* above -30ft/min */
727 else if (speed < -76) /* -15ft/min */
729 else if (speed < -25) /* -5ft/min */
731 else if (speed < 25) /* very hard to find data, but it appears that the recommendations
732 for descent are usually about 2x ascent rate; still, we want
733 stable to mean stable */
735 else if (speed < 152) /* between 5 and 30ft/min is considered slow */
737 else if (speed < 304) /* up to 60ft/min is moderate */
739 else if (speed < 507) /* up to 100ft/min is fast */
741 else /* more than that is just crazy - you'll blow your ears out */
746 static struct plot_info *analyze_plot_info(struct plot_info *pi)
751 /* Do pressure min/max based on the non-surface data */
752 for (i = 0; i < nr; i++) {
753 struct plot_data *entry = pi->entry+i;
754 int pressure = SENSOR_PRESSURE(entry) ? : INTERPOLATED_PRESSURE(entry);
755 int temperature = entry->temperature;
758 if (!pi->minpressure || pressure < pi->minpressure)
759 pi->minpressure = pressure;
760 if (pressure > pi->maxpressure)
761 pi->maxpressure = pressure;
765 if (!pi->mintemp || temperature < pi->mintemp)
766 pi->mintemp = temperature;
767 if (temperature > pi->maxtemp)
768 pi->maxtemp = temperature;
772 /* Smoothing function: 5-point triangular smooth */
773 for (i = 2; i < nr; i++) {
774 struct plot_data *entry = pi->entry+i;
778 depth = entry[-2].depth + 2*entry[-1].depth + 3*entry[0].depth + 2*entry[1].depth + entry[2].depth;
779 entry->smoothed = (depth+4) / 9;
781 /* vertical velocity in mm/sec */
782 /* Linus wants to smooth this - let's at least look at the samples that aren't FAST or CRAZY */
783 if (entry[0].sec - entry[-1].sec) {
784 entry->velocity = velocity((entry[0].depth - entry[-1].depth) / (entry[0].sec - entry[-1].sec));
785 /* if our samples are short and we aren't too FAST*/
786 if (entry[0].sec - entry[-1].sec < 15 && entry->velocity < FAST) {
788 while (i+past > 0 && entry[0].sec - entry[past].sec < 15)
790 entry->velocity = velocity((entry[0].depth - entry[past].depth) /
791 (entry[0].sec - entry[past].sec));
794 entry->velocity = STABLE;
797 /* One-, two- and three-minute minmax data */
798 for (i = 0; i < nr; i++) {
799 struct plot_data *entry = pi->entry +i;
800 analyze_plot_info_minmax(entry, pi->entry, pi->entry+nr);
807 * simple structure to track the beginning and end tank pressure as
808 * well as the integral of depth over time spent while we have no
809 * pressure reading from the tank */
810 typedef struct pr_track_struct pr_track_t;
811 struct pr_track_struct {
816 double pressure_time;
820 static pr_track_t *pr_track_alloc(int start, int t_start) {
821 pr_track_t *pt = malloc(sizeof(pr_track_t));
823 pt->t_start = t_start;
826 pt->pressure_time = 0.0;
831 /* poor man's linked list */
832 static pr_track_t *list_last(pr_track_t *list)
834 pr_track_t *tail = list;
843 static pr_track_t *list_add(pr_track_t *list, pr_track_t *element)
845 pr_track_t *tail = list_last(list);
848 tail->next = element;
852 static void list_free(pr_track_t *list)
856 list_free(list->next);
860 static void fill_missing_tank_pressures(struct dive *dive, struct plot_info *pi,
861 pr_track_t **track_pr)
863 pr_track_t *list = NULL;
864 pr_track_t *nlist = NULL;
867 struct plot_data *entry;
868 int cur_pr[MAX_CYLINDERS];
870 for (cyl = 0; cyl < MAX_CYLINDERS; cyl++) {
871 cur_pr[cyl] = track_pr[cyl]->start;
874 /* The first two are "fillers" */
875 for (i = 2; i < pi->nr; i++) {
876 entry = pi->entry + i;
877 if (SENSOR_PRESSURE(entry)) {
878 cur_pr[entry->cylinderindex] = SENSOR_PRESSURE(entry);
880 if(!list || list->t_end < entry->sec) {
881 nlist = track_pr[entry->cylinderindex];
883 while (nlist && nlist->t_start <= entry->sec) {
887 /* there may be multiple segments - so
888 * let's assemble the length */
890 pt = list->pressure_time;
891 while (!nlist->end) {
894 /* oops - we have no end pressure,
895 * so this means this is a tank without
896 * gas consumption information */
899 pt += nlist->pressure_time;
902 /* just continue without calculating
903 * interpolated values */
907 magic = (nlist->end - cur_pr[entry->cylinderindex]) / pt; }
909 double cur_pt = (entry->sec - (entry-1)->sec) *
910 (1 + entry->depth / 10000.0);
911 INTERPOLATED_PRESSURE(entry) =
912 cur_pr[entry->cylinderindex] + cur_pt * magic;
913 cur_pr[entry->cylinderindex] = INTERPOLATED_PRESSURE(entry);
919 static int get_cylinder_index(struct dive *dive, struct event *ev)
924 * Try to find a cylinder that matches the O2 percentage
925 * in the gas change event 'value' field.
927 * Crazy suunto gas change events. We really should do
928 * this in libdivecomputer or something.
930 for (i = 0; i < MAX_CYLINDERS; i++) {
931 cylinder_t *cyl = dive->cylinder+i;
932 int o2 = (cyl->gasmix.o2.permille + 5) / 10;
940 static struct event *get_next_gaschange(struct event *event)
943 if (!strcmp(event->name, "gaschange"))
950 static int set_cylinder_index(struct plot_info *pi, int i, int cylinderindex, unsigned int end)
953 struct plot_data *entry = pi->entry+i;
954 if (entry->sec > end)
956 if (entry->cylinderindex != cylinderindex) {
957 entry->cylinderindex = cylinderindex;
958 entry->pressure[0] = 0;
965 static void check_gas_change_events(struct dive *dive, struct plot_info *pi)
967 int i = 0, cylinderindex = 0;
968 struct event *ev = get_next_gaschange(dive->events);
974 i = set_cylinder_index(pi, i, cylinderindex, ev->time.seconds);
975 cylinderindex = get_cylinder_index(dive, ev);
976 ev = get_next_gaschange(ev->next);
978 set_cylinder_index(pi, i, cylinderindex, ~0u);
982 * Create a plot-info with smoothing and ranged min/max
984 * This also makes sure that we have extra empty events on both
985 * sides, so that you can do end-points without having to worry
988 static struct plot_info *create_plot_info(struct dive *dive, int nr_samples, struct sample *dive_sample)
990 int cylinderindex = -1;
991 int lastdepth, lastindex;
992 int i, nr = nr_samples + 4, sec, cyl;
993 size_t alloc_size = plot_info_size(nr);
994 struct plot_info *pi;
995 pr_track_t *track_pr[MAX_CYLINDERS] = {NULL, };
996 pr_track_t *pr_track, *current;
997 gboolean missing_pr = FALSE;
998 struct plot_data *entry = NULL;
1000 pi = malloc(alloc_size);
1003 memset(pi, 0, alloc_size);
1008 for (i = 0; i < nr_samples; i++) {
1010 struct sample *sample = dive_sample+i;
1012 entry = pi->entry + i + 2;
1013 sec = entry->sec = sample->time.seconds;
1014 depth = entry->depth = sample->depth.mm;
1015 entry->cylinderindex = sample->cylinderindex;
1016 SENSOR_PRESSURE(entry) = sample->cylinderpressure.mbar;
1017 entry->temperature = sample->temperature.mkelvin;
1019 if (depth || lastdepth)
1023 if (depth > pi->maxdepth)
1024 pi->maxdepth = depth;
1027 check_gas_change_events(dive, pi);
1029 for (cyl = 0; cyl < MAX_CYLINDERS; cyl++) /* initialize the start pressures */
1030 track_pr[cyl] = pr_track_alloc(dive->cylinder[cyl].start.mbar, -1);
1031 current = track_pr[pi->entry[2].cylinderindex];
1032 for (i = 0; i < nr_samples; i++) {
1033 entry = pi->entry + i + 2;
1035 entry->same_cylinder = entry->cylinderindex == cylinderindex;
1036 cylinderindex = entry->cylinderindex;
1038 /* track the segments per cylinder and their pressure/time integral */
1039 if (!entry->same_cylinder) {
1040 current->end = SENSOR_PRESSURE(entry-1);
1041 current->t_end = (entry-1)->sec;
1042 current = pr_track_alloc(SENSOR_PRESSURE(entry), entry->sec);
1043 track_pr[cylinderindex] = list_add(track_pr[cylinderindex], current);
1044 } else { /* same cylinder */
1045 if ((!SENSOR_PRESSURE(entry) && SENSOR_PRESSURE(entry-1)) ||
1046 (SENSOR_PRESSURE(entry) && !SENSOR_PRESSURE(entry-1))) {
1047 /* transmitter changed its working status */
1048 current->end = SENSOR_PRESSURE(entry-1);
1049 current->t_end = (entry-1)->sec;
1050 current = pr_track_alloc(SENSOR_PRESSURE(entry), entry->sec);
1051 track_pr[cylinderindex] =
1052 list_add(track_pr[cylinderindex], current);
1055 /* finally, do the discrete integration to get the SAC rate equivalent */
1056 current->pressure_time += (entry->sec - (entry-1)->sec) *
1057 (1 + entry->depth / 10000.0);
1058 missing_pr |= !SENSOR_PRESSURE(entry);
1062 current->t_end = entry->sec;
1064 for (cyl = 0; cyl < MAX_CYLINDERS; cyl++) { /* initialize the end pressures */
1065 int pr = dive->cylinder[cyl].end.mbar;
1066 if (pr && track_pr[cyl]) {
1067 pr_track = list_last(track_pr[cyl]);
1071 /* Fill in the last two entries with empty values but valid times */
1073 pi->entry[i].sec = sec + 20;
1074 pi->entry[i+1].sec = sec + 40;
1075 pi->nr = lastindex+1;
1076 pi->maxtime = pi->entry[lastindex].sec;
1078 pi->endpressure = pi->minpressure = dive->cylinder[0].end.mbar;
1079 pi->maxpressure = dive->cylinder[0].start.mbar;
1081 pi->meandepth = dive->meandepth.mm;
1084 fill_missing_tank_pressures(dive, pi, track_pr);
1086 for (cyl = 0; cyl < MAX_CYLINDERS; cyl++)
1087 list_free(track_pr[cyl]);
1088 return analyze_plot_info(pi);
1091 void plot(struct graphics_context *gc, cairo_rectangle_int_t *drawing_area, struct dive *dive)
1093 struct plot_info *pi;
1094 static struct sample fake[4];
1095 struct sample *sample = dive->sample;
1096 int nr = dive->samples;
1099 int duration = dive->duration.seconds;
1100 int maxdepth = dive->maxdepth.mm;
1102 fake[1].time.seconds = duration * 0.05;
1103 fake[1].depth.mm = maxdepth;
1104 fake[2].time.seconds = duration * 0.95;
1105 fake[2].depth.mm = maxdepth;
1106 fake[3].time.seconds = duration * 1.00;
1110 pi = create_plot_info(dive, nr, sample);
1112 cairo_translate(gc->cr, drawing_area->x, drawing_area->y);
1113 cairo_set_line_width(gc->cr, 2);
1114 cairo_set_line_cap(gc->cr, CAIRO_LINE_CAP_ROUND);
1115 cairo_set_line_join(gc->cr, CAIRO_LINE_JOIN_ROUND);
1118 * We can use "cairo_translate()" because that doesn't
1119 * scale line width etc. But the actual scaling we need
1120 * do set up ourselves..
1122 * Snif. What a pity.
1124 gc->maxx = (drawing_area->width - 2*drawing_area->x);
1125 gc->maxy = (drawing_area->height - 2*drawing_area->y);
1127 /* Temperature profile */
1128 plot_temperature_profile(gc, pi);
1130 /* Cylinder pressure plot */
1131 plot_cylinder_pressure(gc, pi);
1134 plot_depth_profile(gc, pi);
1135 plot_events(gc, pi, dive);
1137 /* Text on top of all graphs.. */
1138 plot_temperature_text(gc, pi);
1139 plot_depth_text(gc, pi);
1140 plot_cylinder_pressure_text(gc, pi);
1142 /* Bounding box last */
1143 gc->leftx = 0; gc->rightx = 1.0;
1144 gc->topy = 0; gc->bottomy = 1.0;
1146 set_source_rgb(gc, 1, 1, 1);
1151 cairo_close_path(gc->cr);
1152 cairo_stroke(gc->cr);