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)
165 for (i = 0; i < pi->nr; i++) {
166 struct plot_data *data = pi->entry + i;
167 if (event->time.seconds < data->sec)
171 /* draw a little tirangular marker and attach tooltip */
172 x = SCALEX(gc, event->time.seconds);
173 y = SCALEY(gc, depth);
174 set_source_rgba(gc, 1.0, 1.0, 0.1, 0.8);
175 cairo_move_to(gc->cr, x-15, y+6);
176 cairo_line_to(gc->cr, x-3 , y+6);
177 cairo_line_to(gc->cr, x-9, y-6);
178 cairo_line_to(gc->cr, x-15, y+6);
179 cairo_stroke_preserve(gc->cr);
181 set_source_rgba(gc, 0.0, 0.0, 0.0, 0.8);
182 cairo_move_to(gc->cr, x-9, y-3);
183 cairo_line_to(gc->cr, x-9, y+1);
184 cairo_move_to(gc->cr, x-9, y+4);
185 cairo_line_to(gc->cr, x-9, y+4);
186 cairo_stroke(gc->cr);
187 attach_tooltip(x-15, y-6, 12, 12, event->name);
190 static void plot_events(struct graphics_context *gc, struct plot_info *pi, struct dive *dive)
192 static const text_render_options_t tro = {14, 1.0, 0.2, 0.2, CENTER, TOP};
193 struct event *event = dive->events;
199 plot_one_event(gc, pi, event, &tro);
204 static void render_depth_sample(struct graphics_context *gc, struct plot_data *entry, const text_render_options_t *tro)
206 int sec = entry->sec, decimals;
209 d = get_depth_units(entry->val, &decimals, NULL);
211 plot_text(gc, tro, sec, entry->val, "%.*f", decimals, d);
214 static void plot_text_samples(struct graphics_context *gc, struct plot_info *pi)
216 static const text_render_options_t deep = {14, 1.0, 0.2, 0.2, CENTER, TOP};
217 static const text_render_options_t shallow = {14, 1.0, 0.2, 0.2, CENTER, BOTTOM};
220 for (i = 0; i < pi->nr; i++) {
221 struct plot_data *entry = pi->entry + i;
223 if (entry->val < 2000)
226 if (entry == entry->max[2])
227 render_depth_sample(gc, entry, &deep);
229 if (entry == entry->min[2])
230 render_depth_sample(gc, entry, &shallow);
234 static void plot_depth_text(struct graphics_context *gc, struct plot_info *pi)
236 int maxtime, maxdepth;
238 /* Get plot scaling limits */
239 maxtime = get_maxtime(pi);
240 maxdepth = get_maxdepth(pi);
242 gc->leftx = 0; gc->rightx = maxtime;
243 gc->topy = 0; gc->bottomy = maxdepth;
245 plot_text_samples(gc, pi);
248 static void plot_smoothed_profile(struct graphics_context *gc, struct plot_info *pi)
251 struct plot_data *entry = pi->entry;
253 set_source_rgba(gc, 1, 0.2, 0.2, 0.20);
254 move_to(gc, entry->sec, entry->smoothed);
255 for (i = 1; i < pi->nr; i++) {
257 line_to(gc, entry->sec, entry->smoothed);
259 cairo_stroke(gc->cr);
262 static void plot_minmax_profile_minute(struct graphics_context *gc, struct plot_info *pi,
266 struct plot_data *entry = pi->entry;
268 set_source_rgba(gc, 1, 0.2, 1, a);
269 move_to(gc, entry->sec, entry->min[index]->val);
270 for (i = 1; i < pi->nr; i++) {
272 line_to(gc, entry->sec, entry->min[index]->val);
274 for (i = 1; i < pi->nr; i++) {
275 line_to(gc, entry->sec, entry->max[index]->val);
278 cairo_close_path(gc->cr);
282 static void plot_minmax_profile(struct graphics_context *gc, struct plot_info *pi)
286 plot_minmax_profile_minute(gc, pi, 2, 0.1);
287 plot_minmax_profile_minute(gc, pi, 1, 0.1);
288 plot_minmax_profile_minute(gc, pi, 0, 0.1);
291 static void plot_depth_profile(struct graphics_context *gc, struct plot_info *pi)
294 cairo_t *cr = gc->cr;
296 struct plot_data *entry;
297 int maxtime, maxdepth, marker;
299 /* Get plot scaling limits */
300 maxtime = get_maxtime(pi);
301 maxdepth = get_maxdepth(pi);
303 /* Time markers: every 5 min */
304 gc->leftx = 0; gc->rightx = maxtime;
305 gc->topy = 0; gc->bottomy = 1.0;
306 for (i = 5*60; i < maxtime; i += 5*60) {
311 /* Depth markers: every 30 ft or 10 m*/
312 gc->leftx = 0; gc->rightx = 1.0;
313 gc->topy = 0; gc->bottomy = maxdepth;
314 switch (output_units.length) {
315 case METERS: marker = 10000; break;
316 case FEET: marker = 9144; break; /* 30 ft */
319 set_source_rgba(gc, 1, 1, 1, 0.5);
320 for (i = marker; i < maxdepth; i += marker) {
326 /* Show mean depth */
328 set_source_rgba(gc, 1, 0.2, 0.2, 0.40);
329 move_to(gc, 0, pi->meandepth);
330 line_to(gc, 1, pi->meandepth);
334 gc->leftx = 0; gc->rightx = maxtime;
337 * These are good for debugging text placement etc,
338 * but not for actual display..
341 plot_smoothed_profile(gc, pi);
342 plot_minmax_profile(gc, pi);
345 set_source_rgba(gc, 1, 0.2, 0.2, 0.80);
347 /* Do the depth profile for the neat fill */
348 gc->topy = 0; gc->bottomy = maxdepth;
349 set_source_rgba(gc, 1, 0.2, 0.2, 0.20);
353 for (i = 0; i < pi->nr; i++, entry++)
354 line_to(gc, entry->sec, entry->val);
355 cairo_close_path(gc->cr);
357 set_source_rgba(gc, 1, 1, 1, 0.2);
358 cairo_fill_preserve(cr);
359 set_source_rgb(gc, 1, 1, 1);
365 /* Now do it again for the velocity colors */
367 for (i = 1; i < pi->nr; i++) {
370 /* we want to draw the segments in different colors
371 * representing the vertical velocity, so we need to
372 * chop this into short segments */
373 rgb_t color = rgb[entry->velocity];
375 set_source_rgb(gc, color.r, color.g, color.b);
376 move_to(gc, entry[-1].sec, entry[-1].val);
377 line_to(gc, sec, depth);
382 static int setup_temperature_limits(struct graphics_context *gc, struct plot_info *pi)
384 int maxtime, mintemp, maxtemp, delta;
386 /* Get plot scaling limits */
387 maxtime = get_maxtime(pi);
388 mintemp = pi->mintemp;
389 maxtemp = pi->maxtemp;
391 gc->leftx = 0; gc->rightx = maxtime;
392 /* Show temperatures in roughly the lower third, but make sure the scale
393 is at least somewhat reasonable */
394 delta = maxtemp - mintemp;
395 if (delta > 3000) { /* more than 3K in fluctuation */
396 gc->topy = maxtemp + delta*2;
397 gc->bottomy = mintemp - delta/2;
399 gc->topy = maxtemp + 1500 + delta*2;
400 gc->bottomy = mintemp - delta/2;
403 return maxtemp > mintemp;
406 static void plot_single_temp_text(struct graphics_context *gc, int sec, int mkelvin)
410 static const text_render_options_t tro = {12, 0.2, 0.2, 1.0, LEFT, TOP};
411 temperature_t temperature = { mkelvin };
413 if (output_units.temperature == FAHRENHEIT) {
414 deg = to_F(temperature);
415 unit = UTF8_DEGREE "F";
417 deg = to_C(temperature);
418 unit = UTF8_DEGREE "C";
420 plot_text(gc, &tro, sec, temperature.mkelvin, "%d%s", deg, unit);
423 static void plot_temperature_text(struct graphics_context *gc, struct plot_info *pi)
426 int last = 0, sec = 0;
427 int last_temperature = 0, last_printed_temp = 0;
429 if (!setup_temperature_limits(gc, pi))
432 for (i = 0; i < pi->nr; i++) {
433 struct plot_data *entry = pi->entry+i;
434 int mkelvin = entry->temperature;
438 last_temperature = mkelvin;
440 if (sec < last + 300)
443 plot_single_temp_text(gc,sec,mkelvin);
444 last_printed_temp = mkelvin;
446 /* it would be nice to print the end temperature, if it's different */
447 if (abs(last_temperature - last_printed_temp) > 500)
448 plot_single_temp_text(gc, sec, last_temperature);
451 static void plot_temperature_profile(struct graphics_context *gc, struct plot_info *pi)
454 cairo_t *cr = gc->cr;
457 if (!setup_temperature_limits(gc, pi))
460 set_source_rgba(gc, 0.2, 0.2, 1.0, 0.8);
461 for (i = 0; i < pi->nr; i++) {
462 struct plot_data *entry = pi->entry + i;
463 int mkelvin = entry->temperature;
464 int sec = entry->sec;
471 line_to(gc, sec, mkelvin);
473 move_to(gc, sec, mkelvin);
479 /* gets both the actual start and end pressure as well as the scaling factors */
480 static int get_cylinder_pressure_range(struct graphics_context *gc, struct plot_info *pi)
483 gc->rightx = get_maxtime(pi);
485 gc->bottomy = 0; gc->topy = pi->maxpressure * 1.5;
486 return pi->maxpressure != 0;
489 static void plot_cylinder_pressure(struct graphics_context *gc, struct plot_info *pi)
492 int have_pressure = FALSE;
494 if (!get_cylinder_pressure_range(gc, pi))
497 set_source_rgba(gc, 0.2, 1.0, 0.2, 0.80);
499 move_to(gc, 0, pi->maxpressure);
500 for (i = 1; i < pi->nr; i++) {
502 struct plot_data *entry = pi->entry + i;
504 mbar = entry->pressure;
507 have_pressure = TRUE;
508 line_to(gc, entry->sec, mbar);
510 /* if we have valid samples, we don't want to draw a line to the minpressure
511 * but just end wherever the dive ended (think valve shutdowns during dive)
512 * but that doesn't work so well if we have only max and min
515 line_to(gc, pi->maxtime, pi->minpressure);
516 cairo_stroke(gc->cr);
519 static int mbar_to_PSI(int mbar)
521 pressure_t p = {mbar};
525 static void plot_cylinder_pressure_text(struct graphics_context *gc, struct plot_info *pi)
527 if (get_cylinder_pressure_range(gc, pi)) {
529 const char *unit = "bar";
531 switch (output_units.pressure) {
533 start = pi->maxpressure * 100;
534 end = pi->endpressure * 100;
538 start = (pi->maxpressure + 500) / 1000;
539 end = (pi->endpressure + 500) / 1000;
543 start = mbar_to_PSI(pi->maxpressure);
544 end = mbar_to_PSI(pi->endpressure);
549 text_render_options_t tro = {10, 0.2, 1.0, 0.2, LEFT, TOP};
550 plot_text(gc, &tro, 0, pi->maxpressure, "%d %s", start, unit);
551 plot_text(gc, &tro, pi->maxtime, pi->endpressure,
556 static void analyze_plot_info_minmax_minute(struct plot_data *entry, struct plot_data *first, struct plot_data *last, int index)
558 struct plot_data *p = entry;
559 int time = entry->sec;
560 int seconds = 90*(index+1);
561 struct plot_data *min, *max;
564 /* Go back 'seconds' in time */
566 if (p[-1].sec < time - seconds)
571 /* Then go forward until we hit an entry past the time */
577 if (p->sec > time + seconds)
586 entry->min[index] = min;
587 entry->max[index] = max;
588 entry->avg[index] = (avg + nr/2) / nr;
591 static void analyze_plot_info_minmax(struct plot_data *entry, struct plot_data *first, struct plot_data *last)
593 analyze_plot_info_minmax_minute(entry, first, last, 0);
594 analyze_plot_info_minmax_minute(entry, first, last, 1);
595 analyze_plot_info_minmax_minute(entry, first, last, 2);
598 static velocity_t velocity(int speed)
602 if (speed < -304) /* ascent faster than -60ft/min */
604 else if (speed < -152) /* above -30ft/min */
606 else if (speed < -76) /* -15ft/min */
608 else if (speed < -25) /* -5ft/min */
610 else if (speed < 25) /* very hard to find data, but it appears that the recommendations
611 for descent are usually about 2x ascent rate; still, we want
612 stable to mean stable */
614 else if (speed < 152) /* between 5 and 30ft/min is considered slow */
616 else if (speed < 304) /* up to 60ft/min is moderate */
618 else if (speed < 507) /* up to 100ft/min is fast */
620 else /* more than that is just crazy - you'll blow your ears out */
625 static struct plot_info *analyze_plot_info(struct plot_info *pi)
630 /* Do pressure min/max based on the non-surface data */
631 for (i = 0; i < nr; i++) {
632 struct plot_data *entry = pi->entry+i;
633 int pressure = entry->pressure;
634 int temperature = entry->temperature;
637 if (!pi->minpressure || pressure < pi->minpressure)
638 pi->minpressure = pressure;
639 if (pressure > pi->maxpressure)
640 pi->maxpressure = pressure;
644 if (!pi->mintemp || temperature < pi->mintemp)
645 pi->mintemp = temperature;
646 if (temperature > pi->maxtemp)
647 pi->maxtemp = temperature;
651 /* Smoothing function: 5-point triangular smooth */
652 for (i = 2; i < nr; i++) {
653 struct plot_data *entry = pi->entry+i;
657 val = entry[-2].val + 2*entry[-1].val + 3*entry[0].val + 2*entry[1].val + entry[2].val;
658 entry->smoothed = (val+4) / 9;
660 /* vertical velocity in mm/sec */
661 /* Linus wants to smooth this - let's at least look at the samples that aren't FAST or CRAZY */
662 if (entry[0].sec - entry[-1].sec) {
663 entry->velocity = velocity((entry[0].val - entry[-1].val) / (entry[0].sec - entry[-1].sec));
664 /* if our samples are short and we aren't too FAST*/
665 if (entry[0].sec - entry[-1].sec < 15 && entry->velocity < FAST) {
667 while (i+past > 0 && entry[0].sec - entry[past].sec < 15)
669 entry->velocity = velocity((entry[0].val - entry[past].val) /
670 (entry[0].sec - entry[past].sec));
673 entry->velocity = STABLE;
676 /* One-, two- and three-minute minmax data */
677 for (i = 0; i < nr; i++) {
678 struct plot_data *entry = pi->entry +i;
679 analyze_plot_info_minmax(entry, pi->entry, pi->entry+nr);
686 * Create a plot-info with smoothing and ranged min/max
688 * This also makes sure that we have extra empty events on both
689 * sides, so that you can do end-points without having to worry
692 static struct plot_info *create_plot_info(struct dive *dive)
694 int lastdepth, lastindex;
695 int i, nr = dive->samples + 4, sec;
696 size_t alloc_size = plot_info_size(nr);
697 struct plot_info *pi;
699 pi = malloc(alloc_size);
702 memset(pi, 0, alloc_size);
707 for (i = 0; i < dive->samples; i++) {
709 struct sample *sample = dive->sample+i;
710 struct plot_data *entry = pi->entry + i + 2;
712 sec = entry->sec = sample->time.seconds;
713 depth = entry->val = sample->depth.mm;
714 entry->pressure = sample->cylinderpressure.mbar;
715 entry->temperature = sample->temperature.mkelvin;
717 if (depth || lastdepth)
721 if (depth > pi->maxdepth)
722 pi->maxdepth = depth;
726 /* Fill in the last two entries with empty values but valid times */
727 i = dive->samples + 2;
728 pi->entry[i].sec = sec + 20;
729 pi->entry[i+1].sec = sec + 40;
731 pi->nr = lastindex+1;
732 pi->maxtime = pi->entry[lastindex].sec;
734 pi->endpressure = pi->minpressure = dive->cylinder[0].end.mbar;
735 pi->maxpressure = dive->cylinder[0].start.mbar;
737 pi->meandepth = dive->meandepth.mm;
739 return analyze_plot_info(pi);
742 void plot(struct graphics_context *gc, cairo_rectangle_int_t *drawing_area, struct dive *dive)
744 struct plot_info *pi = create_plot_info(dive);
746 cairo_translate(gc->cr, drawing_area->x, drawing_area->y);
747 cairo_set_line_width(gc->cr, 2);
748 cairo_set_line_cap(gc->cr, CAIRO_LINE_CAP_ROUND);
749 cairo_set_line_join(gc->cr, CAIRO_LINE_JOIN_ROUND);
752 * We can use "cairo_translate()" because that doesn't
753 * scale line width etc. But the actual scaling we need
754 * do set up ourselves..
758 gc->maxx = (drawing_area->width - 2*drawing_area->x);
759 gc->maxy = (drawing_area->height - 2*drawing_area->y);
761 /* Temperature profile */
762 plot_temperature_profile(gc, pi);
764 /* Cylinder pressure plot */
765 plot_cylinder_pressure(gc, pi);
768 plot_depth_profile(gc, pi);
769 plot_events(gc, pi, dive);
771 /* Text on top of all graphs.. */
772 plot_temperature_text(gc, pi);
773 plot_depth_text(gc, pi);
774 plot_cylinder_pressure_text(gc, pi);
776 /* Bounding box last */
777 gc->leftx = 0; gc->rightx = 1.0;
778 gc->topy = 0; gc->bottomy = 1.0;
780 set_source_rgb(gc, 1, 1, 1);
785 cairo_close_path(gc->cr);
786 cairo_stroke(gc->cr);