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 */
29 int pressure, temperature;
34 struct plot_data *min[3];
35 struct plot_data *max[3];
40 /* convert velocity to colors */
41 typedef struct { double r, g, b; } rgb_t;
42 static const rgb_t rgb[] = {
43 [STABLE] = {0.0, 0.4, 0.0},
44 [SLOW] = {0.4, 0.8, 0.0},
45 [MODERATE] = {0.8, 0.8, 0.0},
46 [FAST] = {0.8, 0.5, 0.0},
47 [CRAZY] = {1.0, 0.0, 0.0},
50 #define plot_info_size(nr) (sizeof(struct plot_info) + (nr)*sizeof(struct plot_data))
52 /* Scale to 0,0 -> maxx,maxy */
53 #define SCALEX(gc,x) (((x)-gc->leftx)/(gc->rightx-gc->leftx)*gc->maxx)
54 #define SCALEY(gc,y) (((y)-gc->topy)/(gc->bottomy-gc->topy)*gc->maxy)
55 #define SCALE(gc,x,y) SCALEX(gc,x),SCALEY(gc,y)
57 static void move_to(struct graphics_context *gc, double x, double y)
59 cairo_move_to(gc->cr, SCALE(gc, x, y));
62 static void line_to(struct graphics_context *gc, double x, double y)
64 cairo_line_to(gc->cr, SCALE(gc, x, y));
67 static void set_source_rgba(struct graphics_context *gc, double r, double g, double b, double a)
70 * For printers, we still honor 'a', but ignore colors
71 * for now. Black is white and white is black
80 cairo_set_source_rgba(gc->cr, r, g, b, a);
83 void set_source_rgb(struct graphics_context *gc, double r, double g, double b)
85 set_source_rgba(gc, r, g, b, 1);
88 #define ROUND_UP(x,y) ((((x)+(y)-1)/(y))*(y))
91 * When showing dive profiles, we scale things to the
92 * current dive. However, we don't scale past less than
93 * 30 minutes or 90 ft, just so that small dives show
95 * we also need to add 180 seconds at the end so the min/max
98 static int get_maxtime(struct plot_info *pi)
100 int seconds = pi->maxtime;
101 /* min 30 minutes, rounded up to 5 minutes, with at least 2.5 minutes to spare */
102 return MAX(30*60, ROUND_UP(seconds+150, 60*5));
105 static int get_maxdepth(struct plot_info *pi)
107 unsigned mm = pi->maxdepth;
108 /* Minimum 30m, rounded up to 10m, with at least 3m to spare */
109 return MAX(30000, ROUND_UP(mm+3000, 10000));
116 } text_render_options_t;
119 #define CENTER (-0.5)
126 static void plot_text(struct graphics_context *gc, const text_render_options_t *tro,
127 double x, double y, const char *fmt, ...)
129 cairo_t *cr = gc->cr;
130 cairo_font_extents_t fe;
131 cairo_text_extents_t extents;
137 vsnprintf(buffer, sizeof(buffer), fmt, args);
140 cairo_set_font_size(cr, tro->size);
141 cairo_font_extents(cr, &fe);
142 cairo_text_extents(cr, buffer, &extents);
143 dx = tro->hpos * extents.width + extents.x_bearing;
144 dy = tro->vpos * extents.height + fe.descent;
147 cairo_rel_move_to(cr, dx, dy);
149 cairo_text_path(cr, buffer);
150 set_source_rgb(gc, 0, 0, 0);
154 cairo_rel_move_to(cr, dx, dy);
156 set_source_rgb(gc, tro->r, tro->g, tro->b);
157 cairo_show_text(cr, buffer);
160 static void plot_one_event(struct graphics_context *gc, struct plot_info *pi, struct event *event, const text_render_options_t *tro)
164 for (i = 0; i < pi->nr; i++) {
165 struct plot_data *data = pi->entry + i;
166 if (event->time.seconds < data->sec)
170 plot_text(gc, tro, event->time.seconds, depth, "%s", event->name);
173 static void plot_events(struct graphics_context *gc, struct plot_info *pi, struct dive *dive)
175 static const text_render_options_t tro = {14, 1.0, 0.2, 0.2, CENTER, TOP};
176 struct event *event = dive->events;
182 plot_one_event(gc, pi, event, &tro);
187 static void render_depth_sample(struct graphics_context *gc, struct plot_data *entry, const text_render_options_t *tro)
189 int sec = entry->sec, decimals;
192 d = get_depth_units(entry->val, &decimals, NULL);
194 plot_text(gc, tro, sec, entry->val, "%.*f", decimals, d);
197 static void plot_text_samples(struct graphics_context *gc, struct plot_info *pi)
199 static const text_render_options_t deep = {14, 1.0, 0.2, 0.2, CENTER, TOP};
200 static const text_render_options_t shallow = {14, 1.0, 0.2, 0.2, CENTER, BOTTOM};
203 for (i = 0; i < pi->nr; i++) {
204 struct plot_data *entry = pi->entry + i;
206 if (entry->val < 2000)
209 if (entry == entry->max[2])
210 render_depth_sample(gc, entry, &deep);
212 if (entry == entry->min[2])
213 render_depth_sample(gc, entry, &shallow);
217 static void plot_depth_text(struct graphics_context *gc, struct plot_info *pi)
219 int maxtime, maxdepth;
221 /* Get plot scaling limits */
222 maxtime = get_maxtime(pi);
223 maxdepth = get_maxdepth(pi);
225 gc->leftx = 0; gc->rightx = maxtime;
226 gc->topy = 0; gc->bottomy = maxdepth;
228 plot_text_samples(gc, pi);
231 static void plot_smoothed_profile(struct graphics_context *gc, struct plot_info *pi)
234 struct plot_data *entry = pi->entry;
236 set_source_rgba(gc, 1, 0.2, 0.2, 0.20);
237 move_to(gc, entry->sec, entry->smoothed);
238 for (i = 1; i < pi->nr; i++) {
240 line_to(gc, entry->sec, entry->smoothed);
242 cairo_stroke(gc->cr);
245 static void plot_minmax_profile_minute(struct graphics_context *gc, struct plot_info *pi,
249 struct plot_data *entry = pi->entry;
251 set_source_rgba(gc, 1, 0.2, 1, a);
252 move_to(gc, entry->sec, entry->min[index]->val);
253 for (i = 1; i < pi->nr; i++) {
255 line_to(gc, entry->sec, entry->min[index]->val);
257 for (i = 1; i < pi->nr; i++) {
258 line_to(gc, entry->sec, entry->max[index]->val);
261 cairo_close_path(gc->cr);
265 static void plot_minmax_profile(struct graphics_context *gc, struct plot_info *pi)
269 plot_minmax_profile_minute(gc, pi, 2, 0.1);
270 plot_minmax_profile_minute(gc, pi, 1, 0.1);
271 plot_minmax_profile_minute(gc, pi, 0, 0.1);
274 static void plot_depth_profile(struct graphics_context *gc, struct plot_info *pi)
277 cairo_t *cr = gc->cr;
279 struct plot_data *entry;
280 int maxtime, maxdepth, marker;
282 /* Get plot scaling limits */
283 maxtime = get_maxtime(pi);
284 maxdepth = get_maxdepth(pi);
286 /* Time markers: every 5 min */
287 gc->leftx = 0; gc->rightx = maxtime;
288 gc->topy = 0; gc->bottomy = 1.0;
289 for (i = 5*60; i < maxtime; i += 5*60) {
294 /* Depth markers: every 30 ft or 10 m*/
295 gc->leftx = 0; gc->rightx = 1.0;
296 gc->topy = 0; gc->bottomy = maxdepth;
297 switch (output_units.length) {
298 case METERS: marker = 10000; break;
299 case FEET: marker = 9144; break; /* 30 ft */
302 set_source_rgba(gc, 1, 1, 1, 0.5);
303 for (i = marker; i < maxdepth; i += marker) {
309 /* Show mean depth */
311 set_source_rgba(gc, 1, 0.2, 0.2, 0.40);
312 move_to(gc, 0, pi->meandepth);
313 line_to(gc, 1, pi->meandepth);
317 gc->leftx = 0; gc->rightx = maxtime;
320 * These are good for debugging text placement etc,
321 * but not for actual display..
324 plot_smoothed_profile(gc, pi);
325 plot_minmax_profile(gc, pi);
328 set_source_rgba(gc, 1, 0.2, 0.2, 0.80);
330 /* Do the depth profile for the neat fill */
331 gc->topy = 0; gc->bottomy = maxdepth;
332 set_source_rgba(gc, 1, 0.2, 0.2, 0.20);
336 for (i = 0; i < pi->nr; i++, entry++)
337 line_to(gc, entry->sec, entry->val);
338 cairo_close_path(gc->cr);
340 set_source_rgba(gc, 1, 1, 1, 0.2);
341 cairo_fill_preserve(cr);
342 set_source_rgb(gc, 1, 1, 1);
348 /* Now do it again for the velocity colors */
350 for (i = 1; i < pi->nr; i++) {
353 /* we want to draw the segments in different colors
354 * representing the vertical velocity, so we need to
355 * chop this into short segments */
356 rgb_t color = rgb[entry->velocity];
358 set_source_rgb(gc, color.r, color.g, color.b);
359 move_to(gc, entry[-1].sec, entry[-1].val);
360 line_to(gc, sec, depth);
365 static int setup_temperature_limits(struct graphics_context *gc, struct plot_info *pi)
367 int maxtime, mintemp, maxtemp, delta;
369 /* Get plot scaling limits */
370 maxtime = get_maxtime(pi);
371 mintemp = pi->mintemp;
372 maxtemp = pi->maxtemp;
374 gc->leftx = 0; gc->rightx = maxtime;
375 /* Show temperatures in roughly the lower third, but make sure the scale
376 is at least somewhat reasonable */
377 delta = maxtemp - mintemp;
378 if (delta > 3000) { /* more than 3K in fluctuation */
379 gc->topy = maxtemp + delta*2;
380 gc->bottomy = mintemp - delta/2;
382 gc->topy = maxtemp + 1500 + delta*2;
383 gc->bottomy = mintemp - delta/2;
386 return maxtemp > mintemp;
389 static void plot_single_temp_text(struct graphics_context *gc, int sec, int mkelvin)
393 static const text_render_options_t tro = {12, 0.2, 0.2, 1.0, LEFT, TOP};
394 temperature_t temperature = { mkelvin };
396 if (output_units.temperature == FAHRENHEIT) {
397 deg = to_F(temperature);
398 unit = UTF8_DEGREE "F";
400 deg = to_C(temperature);
401 unit = UTF8_DEGREE "C";
403 plot_text(gc, &tro, sec, temperature.mkelvin, "%d%s", deg, unit);
406 static void plot_temperature_text(struct graphics_context *gc, struct plot_info *pi)
409 int last = 0, sec = 0;
410 int last_temperature = 0, last_printed_temp = 0;
412 if (!setup_temperature_limits(gc, pi))
415 for (i = 0; i < pi->nr; i++) {
416 struct plot_data *entry = pi->entry+i;
417 int mkelvin = entry->temperature;
421 last_temperature = mkelvin;
423 if (sec < last + 300)
426 plot_single_temp_text(gc,sec,mkelvin);
427 last_printed_temp = mkelvin;
429 /* it would be nice to print the end temperature, if it's different */
430 if (abs(last_temperature - last_printed_temp) > 500)
431 plot_single_temp_text(gc, sec, last_temperature);
434 static void plot_temperature_profile(struct graphics_context *gc, struct plot_info *pi)
437 cairo_t *cr = gc->cr;
440 if (!setup_temperature_limits(gc, pi))
443 set_source_rgba(gc, 0.2, 0.2, 1.0, 0.8);
444 for (i = 0; i < pi->nr; i++) {
445 struct plot_data *entry = pi->entry + i;
446 int mkelvin = entry->temperature;
447 int sec = entry->sec;
454 line_to(gc, sec, mkelvin);
456 move_to(gc, sec, mkelvin);
462 /* gets both the actual start and end pressure as well as the scaling factors */
463 static int get_cylinder_pressure_range(struct graphics_context *gc, struct plot_info *pi)
466 gc->rightx = get_maxtime(pi);
468 gc->bottomy = 0; gc->topy = pi->maxpressure * 1.5;
469 return pi->maxpressure != 0;
472 static void plot_cylinder_pressure(struct graphics_context *gc, struct plot_info *pi)
475 int have_pressure = FALSE;
477 if (!get_cylinder_pressure_range(gc, pi))
480 set_source_rgba(gc, 0.2, 1.0, 0.2, 0.80);
482 move_to(gc, 0, pi->maxpressure);
483 for (i = 1; i < pi->nr; i++) {
485 struct plot_data *entry = pi->entry + i;
487 mbar = entry->pressure;
490 have_pressure = TRUE;
491 line_to(gc, entry->sec, mbar);
493 /* if we have valid samples, we don't want to draw a line to the minpressure
494 * but just end wherever the dive ended (think valve shutdowns during dive)
495 * but that doesn't work so well if we have only max and min
498 line_to(gc, pi->maxtime, pi->minpressure);
499 cairo_stroke(gc->cr);
502 static int mbar_to_PSI(int mbar)
504 pressure_t p = {mbar};
508 static void plot_cylinder_pressure_text(struct graphics_context *gc, struct plot_info *pi)
510 if (get_cylinder_pressure_range(gc, pi)) {
512 const char *unit = "bar";
514 switch (output_units.pressure) {
516 start = pi->maxpressure * 100;
517 end = pi->endpressure * 100;
521 start = (pi->maxpressure + 500) / 1000;
522 end = (pi->endpressure + 500) / 1000;
526 start = mbar_to_PSI(pi->maxpressure);
527 end = mbar_to_PSI(pi->endpressure);
532 text_render_options_t tro = {10, 0.2, 1.0, 0.2, LEFT, TOP};
533 plot_text(gc, &tro, 0, pi->maxpressure, "%d %s", start, unit);
534 plot_text(gc, &tro, pi->maxtime, pi->endpressure,
539 static void analyze_plot_info_minmax_minute(struct plot_data *entry, struct plot_data *first, struct plot_data *last, int index)
541 struct plot_data *p = entry;
542 int time = entry->sec;
543 int seconds = 90*(index+1);
544 struct plot_data *min, *max;
547 /* Go back 'seconds' in time */
549 if (p[-1].sec < time - seconds)
554 /* Then go forward until we hit an entry past the time */
560 if (p->sec > time + seconds)
569 entry->min[index] = min;
570 entry->max[index] = max;
571 entry->avg[index] = (avg + nr/2) / nr;
574 static void analyze_plot_info_minmax(struct plot_data *entry, struct plot_data *first, struct plot_data *last)
576 analyze_plot_info_minmax_minute(entry, first, last, 0);
577 analyze_plot_info_minmax_minute(entry, first, last, 1);
578 analyze_plot_info_minmax_minute(entry, first, last, 2);
581 static velocity_t velocity(int speed)
585 if (speed < -304) /* ascent faster than -60ft/min */
587 else if (speed < -152) /* above -30ft/min */
589 else if (speed < -76) /* -15ft/min */
591 else if (speed < -25) /* -5ft/min */
593 else if (speed < 25) /* very hard to find data, but it appears that the recommendations
594 for descent are usually about 2x ascent rate; still, we want
595 stable to mean stable */
597 else if (speed < 152) /* between 5 and 30ft/min is considered slow */
599 else if (speed < 304) /* up to 60ft/min is moderate */
601 else if (speed < 507) /* up to 100ft/min is fast */
603 else /* more than that is just crazy - you'll blow your ears out */
608 static struct plot_info *analyze_plot_info(struct plot_info *pi)
613 /* Do pressure min/max based on the non-surface data */
614 for (i = 0; i < nr; i++) {
615 struct plot_data *entry = pi->entry+i;
616 int pressure = entry->pressure;
617 int temperature = entry->temperature;
620 if (!pi->minpressure || pressure < pi->minpressure)
621 pi->minpressure = pressure;
622 if (pressure > pi->maxpressure)
623 pi->maxpressure = pressure;
627 if (!pi->mintemp || temperature < pi->mintemp)
628 pi->mintemp = temperature;
629 if (temperature > pi->maxtemp)
630 pi->maxtemp = temperature;
634 /* Smoothing function: 5-point triangular smooth */
635 for (i = 2; i < nr; i++) {
636 struct plot_data *entry = pi->entry+i;
640 val = entry[-2].val + 2*entry[-1].val + 3*entry[0].val + 2*entry[1].val + entry[2].val;
641 entry->smoothed = (val+4) / 9;
643 /* vertical velocity in mm/sec */
644 /* Linus wants to smooth this - let's at least look at the samples that aren't FAST or CRAZY */
645 if (entry[0].sec - entry[-1].sec) {
646 entry->velocity = velocity((entry[0].val - entry[-1].val) / (entry[0].sec - entry[-1].sec));
647 /* if our samples are short and we aren't too FAST*/
648 if (entry[0].sec - entry[-1].sec < 15 && entry->velocity < FAST) {
650 while (i+past > 0 && entry[0].sec - entry[past].sec < 15)
652 entry->velocity = velocity((entry[0].val - entry[past].val) /
653 (entry[0].sec - entry[past].sec));
656 entry->velocity = STABLE;
659 /* One-, two- and three-minute minmax data */
660 for (i = 0; i < nr; i++) {
661 struct plot_data *entry = pi->entry +i;
662 analyze_plot_info_minmax(entry, pi->entry, pi->entry+nr);
669 * Create a plot-info with smoothing and ranged min/max
671 * This also makes sure that we have extra empty events on both
672 * sides, so that you can do end-points without having to worry
675 static struct plot_info *create_plot_info(struct dive *dive)
677 int lastdepth, lastindex;
678 int i, nr = dive->samples + 4, sec;
679 size_t alloc_size = plot_info_size(nr);
680 struct plot_info *pi;
682 pi = malloc(alloc_size);
685 memset(pi, 0, alloc_size);
690 for (i = 0; i < dive->samples; i++) {
692 struct sample *sample = dive->sample+i;
693 struct plot_data *entry = pi->entry + i + 2;
695 sec = entry->sec = sample->time.seconds;
696 depth = entry->val = sample->depth.mm;
697 entry->pressure = sample->cylinderpressure.mbar;
698 entry->temperature = sample->temperature.mkelvin;
700 if (depth || lastdepth)
704 if (depth > pi->maxdepth)
705 pi->maxdepth = depth;
709 /* Fill in the last two entries with empty values but valid times */
710 i = dive->samples + 2;
711 pi->entry[i].sec = sec + 20;
712 pi->entry[i+1].sec = sec + 40;
714 pi->nr = lastindex+1;
715 pi->maxtime = pi->entry[lastindex].sec;
717 pi->endpressure = pi->minpressure = dive->cylinder[0].end.mbar;
718 pi->maxpressure = dive->cylinder[0].start.mbar;
720 pi->meandepth = dive->meandepth.mm;
722 return analyze_plot_info(pi);
725 void plot(struct graphics_context *gc, int w, int h, struct dive *dive)
728 struct plot_info *pi = create_plot_info(dive);
732 cairo_translate(gc->cr, topx, topy);
733 cairo_set_line_width(gc->cr, 2);
734 cairo_set_line_cap(gc->cr, CAIRO_LINE_CAP_ROUND);
735 cairo_set_line_join(gc->cr, CAIRO_LINE_JOIN_ROUND);
738 * We can use "cairo_translate()" because that doesn't
739 * scale line width etc. But the actual scaling we need
740 * do set up ourselves..
744 gc->maxx = (w - 2*topx);
745 gc->maxy = (h - 2*topy);
747 /* Temperature profile */
748 plot_temperature_profile(gc, pi);
750 /* Cylinder pressure plot */
751 plot_cylinder_pressure(gc, pi);
754 plot_depth_profile(gc, pi);
755 plot_events(gc, pi, dive);
757 /* Text on top of all graphs.. */
758 plot_temperature_text(gc, pi);
759 plot_depth_text(gc, pi);
760 plot_cylinder_pressure_text(gc, pi);
762 /* Bounding box last */
763 gc->leftx = 0; gc->rightx = 1.0;
764 gc->topy = 0; gc->bottomy = 1.0;
766 set_source_rgb(gc, 1, 1, 1);
771 cairo_close_path(gc->cr);
772 cairo_stroke(gc->cr);