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);
169 static void plot_one_event(struct graphics_context *gc, struct plot_info *pi, struct event *event, const text_render_options_t *tro)
174 for (i = 0; i < pi->nr; i++) {
175 struct plot_data *data = pi->entry + i;
176 if (event->time.seconds < data->sec)
180 /* draw a little tirangular marker and attach tooltip */
181 x = SCALEX(gc, event->time.seconds);
182 y = SCALEY(gc, depth);
183 set_source_rgba(gc, 1.0, 1.0, 0.1, 0.8);
184 cairo_move_to(gc->cr, x-15, y+6);
185 cairo_line_to(gc->cr, x-3 , y+6);
186 cairo_line_to(gc->cr, x-9, y-6);
187 cairo_line_to(gc->cr, x-15, y+6);
188 cairo_stroke_preserve(gc->cr);
190 set_source_rgba(gc, 0.0, 0.0, 0.0, 0.8);
191 cairo_move_to(gc->cr, x-9, y-3);
192 cairo_line_to(gc->cr, x-9, y+1);
193 cairo_move_to(gc->cr, x-9, y+4);
194 cairo_line_to(gc->cr, x-9, y+4);
195 cairo_stroke(gc->cr);
196 attach_tooltip(x-15, y-6, 12, 12, event->name);
199 static void plot_events(struct graphics_context *gc, struct plot_info *pi, struct dive *dive)
201 static const text_render_options_t tro = {14, 1.0, 0.2, 0.2, CENTER, TOP};
202 struct event *event = dive->events;
208 plot_one_event(gc, pi, event, &tro);
213 static void render_depth_sample(struct graphics_context *gc, struct plot_data *entry, const text_render_options_t *tro)
215 int sec = entry->sec, decimals;
218 d = get_depth_units(entry->depth, &decimals, NULL);
220 plot_text(gc, tro, sec, entry->depth, "%.*f", decimals, d);
223 static void plot_text_samples(struct graphics_context *gc, struct plot_info *pi)
225 static const text_render_options_t deep = {14, 1.0, 0.2, 0.2, CENTER, TOP};
226 static const text_render_options_t shallow = {14, 1.0, 0.2, 0.2, CENTER, BOTTOM};
229 for (i = 0; i < pi->nr; i++) {
230 struct plot_data *entry = pi->entry + i;
232 if (entry->depth < 2000)
235 if (entry == entry->max[2])
236 render_depth_sample(gc, entry, &deep);
238 if (entry == entry->min[2])
239 render_depth_sample(gc, entry, &shallow);
243 static void plot_depth_text(struct graphics_context *gc, struct plot_info *pi)
245 int maxtime, maxdepth;
247 /* Get plot scaling limits */
248 maxtime = get_maxtime(pi);
249 maxdepth = get_maxdepth(pi);
251 gc->leftx = 0; gc->rightx = maxtime;
252 gc->topy = 0; gc->bottomy = maxdepth;
254 plot_text_samples(gc, pi);
257 static void plot_smoothed_profile(struct graphics_context *gc, struct plot_info *pi)
260 struct plot_data *entry = pi->entry;
262 set_source_rgba(gc, 1, 0.2, 0.2, 0.20);
263 move_to(gc, entry->sec, entry->smoothed);
264 for (i = 1; i < pi->nr; i++) {
266 line_to(gc, entry->sec, entry->smoothed);
268 cairo_stroke(gc->cr);
271 static void plot_minmax_profile_minute(struct graphics_context *gc, struct plot_info *pi,
275 struct plot_data *entry = pi->entry;
277 set_source_rgba(gc, 1, 0.2, 1, a);
278 move_to(gc, entry->sec, entry->min[index]->depth);
279 for (i = 1; i < pi->nr; i++) {
281 line_to(gc, entry->sec, entry->min[index]->depth);
283 for (i = 1; i < pi->nr; i++) {
284 line_to(gc, entry->sec, entry->max[index]->depth);
287 cairo_close_path(gc->cr);
291 static void plot_minmax_profile(struct graphics_context *gc, struct plot_info *pi)
295 plot_minmax_profile_minute(gc, pi, 2, 0.1);
296 plot_minmax_profile_minute(gc, pi, 1, 0.1);
297 plot_minmax_profile_minute(gc, pi, 0, 0.1);
300 static void plot_depth_profile(struct graphics_context *gc, struct plot_info *pi)
303 cairo_t *cr = gc->cr;
305 struct plot_data *entry;
306 int maxtime, maxdepth, marker;
307 int increments[4] = { 5*60, 10*60, 15*60, 30*60 };
309 /* Get plot scaling limits */
310 maxtime = get_maxtime(pi);
311 maxdepth = get_maxdepth(pi);
313 /* Time markers: at most every 5 min, but no more than 12 markers
314 * and for convenience we do 5, 10, 15 or 30 min intervals.
315 * This allows for 6h dives - enough (I hope) for even the craziest
316 * divers - but just in case, for those 8h depth-record-breaking dives,
317 * we double the interval if this still doesn't get us to 12 or fewer
320 while (maxtime / increments[i] > 12 && i < 4)
322 incr = increments[i];
323 while (maxtime / incr > 12)
326 gc->leftx = 0; gc->rightx = maxtime;
327 gc->topy = 0; gc->bottomy = 1.0;
328 set_source_rgba(gc, 1, 1, 1, 0.5);
329 for (i = incr; i < maxtime; i += incr) {
335 /* now the text on every second time marker */
336 text_render_options_t tro = {10, 0.2, 1.0, 0.2, CENTER, TOP};
337 for (i = incr; i < maxtime; i += 2 * incr)
338 plot_text(gc, &tro, i, 1, "%d", i/60);
340 /* Depth markers: every 30 ft or 10 m*/
341 gc->leftx = 0; gc->rightx = 1.0;
342 gc->topy = 0; gc->bottomy = maxdepth;
343 switch (output_units.length) {
344 case METERS: marker = 10000; break;
345 case FEET: marker = 9144; break; /* 30 ft */
348 set_source_rgba(gc, 1, 1, 1, 0.5);
349 for (i = marker; i < maxdepth; i += marker) {
355 /* Show mean depth */
357 set_source_rgba(gc, 1, 0.2, 0.2, 0.40);
358 move_to(gc, 0, pi->meandepth);
359 line_to(gc, 1, pi->meandepth);
363 gc->leftx = 0; gc->rightx = maxtime;
366 * These are good for debugging text placement etc,
367 * but not for actual display..
370 plot_smoothed_profile(gc, pi);
371 plot_minmax_profile(gc, pi);
374 set_source_rgba(gc, 1, 0.2, 0.2, 0.80);
376 /* Do the depth profile for the neat fill */
377 gc->topy = 0; gc->bottomy = maxdepth;
378 set_source_rgba(gc, 1, 0.2, 0.2, 0.20);
382 for (i = 0; i < pi->nr; i++, entry++)
383 line_to(gc, entry->sec, entry->depth);
384 cairo_close_path(gc->cr);
386 set_source_rgba(gc, 1, 1, 1, 0.2);
387 cairo_fill_preserve(cr);
388 set_source_rgb(gc, 1, 1, 1);
394 /* Now do it again for the velocity colors */
396 for (i = 1; i < pi->nr; i++) {
399 /* we want to draw the segments in different colors
400 * representing the vertical velocity, so we need to
401 * chop this into short segments */
402 rgb_t color = rgb[entry->velocity];
403 depth = entry->depth;
404 set_source_rgb(gc, color.r, color.g, color.b);
405 move_to(gc, entry[-1].sec, entry[-1].depth);
406 line_to(gc, sec, depth);
411 static int setup_temperature_limits(struct graphics_context *gc, struct plot_info *pi)
413 int maxtime, mintemp, maxtemp, delta;
415 /* Get plot scaling limits */
416 maxtime = get_maxtime(pi);
417 mintemp = pi->mintemp;
418 maxtemp = pi->maxtemp;
420 gc->leftx = 0; gc->rightx = maxtime;
421 /* Show temperatures in roughly the lower third, but make sure the scale
422 is at least somewhat reasonable */
423 delta = maxtemp - mintemp;
424 if (delta > 3000) { /* more than 3K in fluctuation */
425 gc->topy = maxtemp + delta*2;
426 gc->bottomy = mintemp - delta/2;
428 gc->topy = maxtemp + 1500 + delta*2;
429 gc->bottomy = mintemp - delta/2;
432 return maxtemp > mintemp;
435 static void plot_single_temp_text(struct graphics_context *gc, int sec, int mkelvin)
439 static const text_render_options_t tro = {12, 0.2, 0.2, 1.0, LEFT, TOP};
440 temperature_t temperature = { mkelvin };
442 if (output_units.temperature == FAHRENHEIT) {
443 deg = to_F(temperature);
444 unit = UTF8_DEGREE "F";
446 deg = to_C(temperature);
447 unit = UTF8_DEGREE "C";
449 plot_text(gc, &tro, sec, temperature.mkelvin, "%d%s", deg, unit);
452 static void plot_temperature_text(struct graphics_context *gc, struct plot_info *pi)
455 int last = 0, sec = 0;
456 int last_temperature = 0, last_printed_temp = 0;
458 if (!setup_temperature_limits(gc, pi))
461 for (i = 0; i < pi->nr; i++) {
462 struct plot_data *entry = pi->entry+i;
463 int mkelvin = entry->temperature;
467 last_temperature = mkelvin;
469 if (sec < last + 300)
472 plot_single_temp_text(gc,sec,mkelvin);
473 last_printed_temp = mkelvin;
475 /* it would be nice to print the end temperature, if it's different */
476 if (abs(last_temperature - last_printed_temp) > 500)
477 plot_single_temp_text(gc, sec, last_temperature);
480 static void plot_temperature_profile(struct graphics_context *gc, struct plot_info *pi)
483 cairo_t *cr = gc->cr;
486 if (!setup_temperature_limits(gc, pi))
489 set_source_rgba(gc, 0.2, 0.2, 1.0, 0.8);
490 for (i = 0; i < pi->nr; i++) {
491 struct plot_data *entry = pi->entry + i;
492 int mkelvin = entry->temperature;
493 int sec = entry->sec;
500 line_to(gc, sec, mkelvin);
502 move_to(gc, sec, mkelvin);
508 /* gets both the actual start and end pressure as well as the scaling factors */
509 static int get_cylinder_pressure_range(struct graphics_context *gc, struct plot_info *pi)
512 gc->rightx = get_maxtime(pi);
514 gc->bottomy = 0; gc->topy = pi->maxpressure * 1.5;
515 return pi->maxpressure != 0;
518 static void plot_pressure_helper(struct graphics_context *gc, struct plot_info *pi, int type)
521 int lift_pen = FALSE;
523 for (i = 0; i < pi->nr; i++) {
525 struct plot_data *entry = pi->entry + i;
527 mbar = entry->pressure[type];
528 if (!entry->same_cylinder)
535 if (i > 0 && entry->same_cylinder) {
536 /* if we have a previous event from the same tank,
537 * draw at least a short line .
538 * This uses the implementation detail that the
539 * type is either 0 or 1 */
541 prev_pr = (entry-1)->pressure[type] ? : (entry-1)->pressure[1 - type];
542 move_to(gc, (entry-1)->sec, prev_pr);
543 line_to(gc, entry->sec, mbar);
545 move_to(gc, entry->sec, mbar);
549 line_to(gc, entry->sec, mbar);
551 cairo_stroke(gc->cr);
555 static void plot_cylinder_pressure(struct graphics_context *gc, struct plot_info *pi)
557 if (!get_cylinder_pressure_range(gc, pi))
560 /* first plot the pressure readings we have from the dive computer */
561 set_source_rgba(gc, 0.2, 1.0, 0.2, 0.80);
562 plot_pressure_helper(gc, pi, SENSOR_PR);
564 /* then, in a different color, the interpolated values */
565 set_source_rgba(gc, 1.0, 1.0, 0.2, 0.80);
566 plot_pressure_helper(gc, pi, INTERPOLATED_PR);
569 static int mbar_to_PSI(int mbar)
571 pressure_t p = {mbar};
575 static void plot_pressure_value(struct graphics_context *gc, int mbar, int sec,
576 int xalign, int yalign)
581 switch (output_units.pressure) {
583 pressure = mbar * 100;
587 pressure = (mbar + 500) / 1000;
591 pressure = mbar_to_PSI(mbar);
595 text_render_options_t tro = {10, 0.2, 1.0, 0.2, xalign, yalign};
596 plot_text(gc, &tro, sec, mbar, "%d %s", pressure, unit);
599 static void plot_cylinder_pressure_text(struct graphics_context *gc, struct plot_info *pi)
603 int seen_cyl[MAX_CYLINDERS] = { FALSE, };
604 int last_pressure[MAX_CYLINDERS] = { 0, };
605 int last_time[MAX_CYLINDERS] = { 0, };
606 struct plot_data *entry;
608 if (!get_cylinder_pressure_range(gc, pi))
611 /* only loop over the actual events from the dive computer */
612 for (i = 2; i < pi->nr - 2; i++) {
613 entry = pi->entry + i;
615 if (!entry->same_cylinder) {
616 cyl = entry->cylinderindex;
617 if (!seen_cyl[cyl]) {
618 mbar = SENSOR_PRESSURE(entry) ? : INTERPOLATED_PRESSURE(entry);
619 plot_pressure_value(gc, mbar, entry->sec, LEFT, BOTTOM);
620 seen_cyl[cyl] = TRUE;
623 /* remember the last pressure and time of
624 * the previous cylinder */
625 cyl = (entry - 1)->cylinderindex;
627 SENSOR_PRESSURE(entry - 1) ? : INTERPOLATED_PRESSURE(entry - 1);
628 last_time[cyl] = (entry - 1)->sec;
632 cyl = entry->cylinderindex;
633 last_pressure[cyl] = SENSOR_PRESSURE(entry) ? : INTERPOLATED_PRESSURE(entry);
634 last_time[cyl] = entry->sec;
636 for (cyl = 0; cyl < MAX_CYLINDERS; cyl++) {
637 if (last_time[cyl]) {
638 plot_pressure_value(gc, last_pressure[cyl], last_time[cyl], CENTER, TOP);
643 static void analyze_plot_info_minmax_minute(struct plot_data *entry, struct plot_data *first, struct plot_data *last, int index)
645 struct plot_data *p = entry;
646 int time = entry->sec;
647 int seconds = 90*(index+1);
648 struct plot_data *min, *max;
651 /* Go back 'seconds' in time */
653 if (p[-1].sec < time - seconds)
658 /* Then go forward until we hit an entry past the time */
663 int depth = p->depth;
664 if (p->sec > time + seconds)
668 if (depth < min->depth)
670 if (depth > max->depth)
673 entry->min[index] = min;
674 entry->max[index] = max;
675 entry->avg[index] = (avg + nr/2) / nr;
678 static void analyze_plot_info_minmax(struct plot_data *entry, struct plot_data *first, struct plot_data *last)
680 analyze_plot_info_minmax_minute(entry, first, last, 0);
681 analyze_plot_info_minmax_minute(entry, first, last, 1);
682 analyze_plot_info_minmax_minute(entry, first, last, 2);
685 static velocity_t velocity(int speed)
689 if (speed < -304) /* ascent faster than -60ft/min */
691 else if (speed < -152) /* above -30ft/min */
693 else if (speed < -76) /* -15ft/min */
695 else if (speed < -25) /* -5ft/min */
697 else if (speed < 25) /* very hard to find data, but it appears that the recommendations
698 for descent are usually about 2x ascent rate; still, we want
699 stable to mean stable */
701 else if (speed < 152) /* between 5 and 30ft/min is considered slow */
703 else if (speed < 304) /* up to 60ft/min is moderate */
705 else if (speed < 507) /* up to 100ft/min is fast */
707 else /* more than that is just crazy - you'll blow your ears out */
712 static struct plot_info *analyze_plot_info(struct plot_info *pi)
717 /* Do pressure min/max based on the non-surface data */
718 for (i = 0; i < nr; i++) {
719 struct plot_data *entry = pi->entry+i;
720 int pressure = SENSOR_PRESSURE(entry) ? : INTERPOLATED_PRESSURE(entry);
721 int temperature = entry->temperature;
724 if (!pi->minpressure || pressure < pi->minpressure)
725 pi->minpressure = pressure;
726 if (pressure > pi->maxpressure)
727 pi->maxpressure = pressure;
731 if (!pi->mintemp || temperature < pi->mintemp)
732 pi->mintemp = temperature;
733 if (temperature > pi->maxtemp)
734 pi->maxtemp = temperature;
738 /* Smoothing function: 5-point triangular smooth */
739 for (i = 2; i < nr; i++) {
740 struct plot_data *entry = pi->entry+i;
744 depth = entry[-2].depth + 2*entry[-1].depth + 3*entry[0].depth + 2*entry[1].depth + entry[2].depth;
745 entry->smoothed = (depth+4) / 9;
747 /* vertical velocity in mm/sec */
748 /* Linus wants to smooth this - let's at least look at the samples that aren't FAST or CRAZY */
749 if (entry[0].sec - entry[-1].sec) {
750 entry->velocity = velocity((entry[0].depth - entry[-1].depth) / (entry[0].sec - entry[-1].sec));
751 /* if our samples are short and we aren't too FAST*/
752 if (entry[0].sec - entry[-1].sec < 15 && entry->velocity < FAST) {
754 while (i+past > 0 && entry[0].sec - entry[past].sec < 15)
756 entry->velocity = velocity((entry[0].depth - entry[past].depth) /
757 (entry[0].sec - entry[past].sec));
760 entry->velocity = STABLE;
763 /* One-, two- and three-minute minmax data */
764 for (i = 0; i < nr; i++) {
765 struct plot_data *entry = pi->entry +i;
766 analyze_plot_info_minmax(entry, pi->entry, pi->entry+nr);
773 * simple structure to track the beginning and end tank pressure as
774 * well as the integral of depth over time spent while we have no
775 * pressure reading from the tank */
776 typedef struct pr_track_struct pr_track_t;
777 struct pr_track_struct {
782 double pressure_time;
786 static pr_track_t *pr_track_alloc(int start, int t_start) {
787 pr_track_t *pt = malloc(sizeof(pr_track_t));
789 pt->t_start = t_start;
792 pt->pressure_time = 0.0;
797 /* poor man's linked list */
798 static pr_track_t *list_last(pr_track_t *list)
800 pr_track_t *tail = list;
809 static pr_track_t *list_add(pr_track_t *list, pr_track_t *element)
811 pr_track_t *tail = list_last(list);
814 tail->next = element;
818 static void list_free(pr_track_t *list)
822 list_free(list->next);
826 static void fill_missing_tank_pressures(struct dive *dive, struct plot_info *pi,
827 pr_track_t **track_pr)
829 pr_track_t *list = NULL;
830 pr_track_t *nlist = NULL;
833 struct plot_data *entry;
834 int cur_pr[MAX_CYLINDERS];
836 for (cyl = 0; cyl < MAX_CYLINDERS; cyl++) {
837 cur_pr[cyl] = track_pr[cyl]->start;
839 for (i = 0; i < dive->samples; i++) {
840 entry = pi->entry + i + 2;
841 if (SENSOR_PRESSURE(entry)) {
842 cur_pr[entry->cylinderindex] = SENSOR_PRESSURE(entry);
844 if(!list || list->t_end < entry->sec) {
845 nlist = track_pr[entry->cylinderindex];
847 while (nlist && nlist->t_start <= entry->sec) {
851 /* there may be multiple segments - so
852 * let's assemble the length */
854 pt = list->pressure_time;
855 while (!nlist->end) {
858 /* oops - we have no end pressure,
859 * so this means this is a tank without
860 * gas consumption information */
863 pt += nlist->pressure_time;
866 /* just continue without calculating
867 * interpolated values */
871 magic = (nlist->end - cur_pr[entry->cylinderindex]) / pt; }
873 double cur_pt = (entry->sec - (entry-1)->sec) *
874 (1 + entry->depth / 10000.0);
875 INTERPOLATED_PRESSURE(entry) =
876 cur_pr[entry->cylinderindex] + cur_pt * magic;
877 cur_pr[entry->cylinderindex] = INTERPOLATED_PRESSURE(entry);
883 static int get_cylinder_index(struct dive *dive, struct event *ev)
888 * Try to find a cylinder that matches the O2 percentage
889 * in the gas change event 'value' field.
891 * Crazy suunto gas change events. We really should do
892 * this in libdivecomputer or something.
894 for (i = 0; i < MAX_CYLINDERS; i++) {
895 cylinder_t *cyl = dive->cylinder+i;
896 int o2 = (cyl->gasmix.o2.permille + 5) / 10;
904 static struct event *get_next_gaschange(struct event *event)
907 if (!strcmp(event->name, "gaschange"))
914 static int set_cylinder_index(struct plot_info *pi, int i, int cylinderindex, unsigned int end)
917 struct plot_data *entry = pi->entry+i;
918 if (entry->sec > end)
920 if (entry->cylinderindex != cylinderindex) {
921 entry->cylinderindex = cylinderindex;
922 entry->pressure[0] = 0;
929 static void check_gas_change_events(struct dive *dive, struct plot_info *pi)
931 int i = 0, cylinderindex = 0;
932 struct event *ev = get_next_gaschange(dive->events);
938 i = set_cylinder_index(pi, i, cylinderindex, ev->time.seconds);
939 cylinderindex = get_cylinder_index(dive, ev);
940 ev = get_next_gaschange(ev->next);
942 set_cylinder_index(pi, i, cylinderindex, ~0u);
946 * Create a plot-info with smoothing and ranged min/max
948 * This also makes sure that we have extra empty events on both
949 * sides, so that you can do end-points without having to worry
952 static struct plot_info *create_plot_info(struct dive *dive)
954 int cylinderindex = -1;
955 int lastdepth, lastindex;
956 int i, nr = dive->samples + 4, sec, cyl;
957 size_t alloc_size = plot_info_size(nr);
958 struct plot_info *pi;
959 pr_track_t *track_pr[MAX_CYLINDERS] = {NULL, };
960 pr_track_t *pr_track, *current;
961 gboolean missing_pr = FALSE;
962 struct plot_data *entry;
964 pi = malloc(alloc_size);
967 memset(pi, 0, alloc_size);
972 for (i = 0; i < dive->samples; i++) {
974 struct sample *sample = dive->sample+i;
976 entry = pi->entry + i + 2;
977 sec = entry->sec = sample->time.seconds;
978 depth = entry->depth = sample->depth.mm;
979 entry->cylinderindex = sample->cylinderindex;
980 SENSOR_PRESSURE(entry) = sample->cylinderpressure.mbar;
981 entry->temperature = sample->temperature.mkelvin;
983 if (depth || lastdepth)
987 if (depth > pi->maxdepth)
988 pi->maxdepth = depth;
991 check_gas_change_events(dive, pi);
993 for (cyl = 0; cyl < MAX_CYLINDERS; cyl++) /* initialize the start pressures */
994 track_pr[cyl] = pr_track_alloc(dive->cylinder[cyl].start.mbar, -1);
995 current = track_pr[dive->sample[0].cylinderindex];
996 for (i = 0; i < dive->samples; i++) {
997 entry = pi->entry + i + 2;
999 entry->same_cylinder = entry->cylinderindex == cylinderindex;
1000 cylinderindex = entry->cylinderindex;
1002 /* track the segments per cylinder and their pressure/time integral */
1003 if (!entry->same_cylinder) {
1004 current->end = SENSOR_PRESSURE(entry-1);
1005 current->t_end = (entry-1)->sec;
1006 current = pr_track_alloc(SENSOR_PRESSURE(entry), entry->sec);
1007 track_pr[cylinderindex] = list_add(track_pr[cylinderindex], current);
1008 } else { /* same cylinder */
1009 if ((!SENSOR_PRESSURE(entry) && SENSOR_PRESSURE(entry-1)) ||
1010 (SENSOR_PRESSURE(entry) && !SENSOR_PRESSURE(entry-1))) {
1011 /* transmitter changed its working status */
1012 current->end = SENSOR_PRESSURE(entry-1);
1013 current->t_end = (entry-1)->sec;
1014 current = pr_track_alloc(SENSOR_PRESSURE(entry), entry->sec);
1015 track_pr[cylinderindex] =
1016 list_add(track_pr[cylinderindex], current);
1019 /* finally, do the discrete integration to get the SAC rate equivalent */
1020 current->pressure_time += (entry->sec - (entry-1)->sec) *
1021 (1 + entry->depth / 10000.0);
1022 missing_pr |= !SENSOR_PRESSURE(entry);
1025 current->t_end = entry->sec;
1026 for (cyl = 0; cyl < MAX_CYLINDERS; cyl++) { /* initialize the end pressures */
1027 int pr = dive->cylinder[cyl].end.mbar;
1028 if (pr && track_pr[cyl]) {
1029 pr_track = list_last(track_pr[cyl]);
1035 /* Fill in the last two entries with empty values but valid times */
1036 i = dive->samples + 2;
1037 pi->entry[i].sec = sec + 20;
1038 pi->entry[i+1].sec = sec + 40;
1039 pi->nr = lastindex+1;
1040 pi->maxtime = pi->entry[lastindex].sec;
1042 pi->endpressure = pi->minpressure = dive->cylinder[0].end.mbar;
1043 pi->maxpressure = dive->cylinder[0].start.mbar;
1045 pi->meandepth = dive->meandepth.mm;
1048 fill_missing_tank_pressures(dive, pi, track_pr);
1050 for (cyl = 0; cyl < MAX_CYLINDERS; cyl++)
1051 list_free(track_pr[cyl]);
1052 return analyze_plot_info(pi);
1055 void plot(struct graphics_context *gc, cairo_rectangle_int_t *drawing_area, struct dive *dive)
1057 struct plot_info *pi = create_plot_info(dive);
1059 cairo_translate(gc->cr, drawing_area->x, drawing_area->y);
1060 cairo_set_line_width(gc->cr, 2);
1061 cairo_set_line_cap(gc->cr, CAIRO_LINE_CAP_ROUND);
1062 cairo_set_line_join(gc->cr, CAIRO_LINE_JOIN_ROUND);
1065 * We can use "cairo_translate()" because that doesn't
1066 * scale line width etc. But the actual scaling we need
1067 * do set up ourselves..
1069 * Snif. What a pity.
1071 gc->maxx = (drawing_area->width - 2*drawing_area->x);
1072 gc->maxy = (drawing_area->height - 2*drawing_area->y);
1074 /* Temperature profile */
1075 plot_temperature_profile(gc, pi);
1077 /* Cylinder pressure plot */
1078 plot_cylinder_pressure(gc, pi);
1081 plot_depth_profile(gc, pi);
1082 plot_events(gc, pi, dive);
1084 /* Text on top of all graphs.. */
1085 plot_temperature_text(gc, pi);
1086 plot_depth_text(gc, pi);
1087 plot_cylinder_pressure_text(gc, pi);
1089 /* Bounding box last */
1090 gc->leftx = 0; gc->rightx = 1.0;
1091 gc->topy = 0; gc->bottomy = 1.0;
1093 set_source_rgb(gc, 1, 1, 1);
1098 cairo_close_path(gc->cr);
1099 cairo_stroke(gc->cr);