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;
28 int pressure, temperature;
33 struct plot_data *min[3];
34 struct plot_data *max[3];
39 /* convert velocity to colors */
40 typedef struct { double r, g, b; } rgb_t;
41 static const rgb_t rgb[] = {
42 [STABLE] = {0.0, 0.4, 0.0},
43 [SLOW] = {0.4, 0.8, 0.0},
44 [MODERATE] = {0.8, 0.8, 0.0},
45 [FAST] = {0.8, 0.5, 0.0},
46 [CRAZY] = {1.0, 0.0, 0.0},
49 #define plot_info_size(nr) (sizeof(struct plot_info) + (nr)*sizeof(struct plot_data))
51 /* Scale to 0,0 -> maxx,maxy */
52 #define SCALEX(gc,x) (((x)-gc->leftx)/(gc->rightx-gc->leftx)*gc->maxx)
53 #define SCALEY(gc,y) (((y)-gc->topy)/(gc->bottomy-gc->topy)*gc->maxy)
54 #define SCALE(gc,x,y) SCALEX(gc,x),SCALEY(gc,y)
56 static void move_to(struct graphics_context *gc, double x, double y)
58 cairo_move_to(gc->cr, SCALE(gc, x, y));
61 static void line_to(struct graphics_context *gc, double x, double y)
63 cairo_line_to(gc->cr, SCALE(gc, x, y));
66 static void set_source_rgba(struct graphics_context *gc, double r, double g, double b, double a)
69 * For printers, we still honor 'a', but ignore colors
70 * for now. Black is white and white is black
79 cairo_set_source_rgba(gc->cr, r, g, b, a);
82 void set_source_rgb(struct graphics_context *gc, double r, double g, double b)
84 set_source_rgba(gc, r, g, b, 1);
87 #define ROUND_UP(x,y) ((((x)+(y)-1)/(y))*(y))
90 * When showing dive profiles, we scale things to the
91 * current dive. However, we don't scale past less than
92 * 30 minutes or 90 ft, just so that small dives show
94 * we also need to add 180 seconds at the end so the min/max
97 static int get_maxtime(struct plot_info *pi)
99 int seconds = pi->maxtime;
100 /* min 30 minutes, rounded up to 5 minutes, with at least 2.5 minutes to spare */
101 return MAX(30*60, ROUND_UP(seconds+150, 60*5));
104 static int get_maxdepth(struct plot_info *pi)
106 unsigned mm = pi->maxdepth;
107 /* Minimum 30m, rounded up to 10m, with at least 3m to spare */
108 return MAX(30000, ROUND_UP(mm+3000, 10000));
115 } text_render_options_t;
118 #define CENTER (-0.5)
125 static void plot_text(struct graphics_context *gc, const text_render_options_t *tro,
126 double x, double y, const char *fmt, ...)
128 cairo_t *cr = gc->cr;
129 cairo_font_extents_t fe;
130 cairo_text_extents_t extents;
136 vsnprintf(buffer, sizeof(buffer), fmt, args);
139 cairo_set_font_size(cr, tro->size);
140 cairo_font_extents(cr, &fe);
141 cairo_text_extents(cr, buffer, &extents);
142 dx = tro->hpos * extents.width + extents.x_bearing;
143 dy = tro->vpos * extents.height + fe.descent;
146 cairo_rel_move_to(cr, dx, dy);
148 cairo_text_path(cr, buffer);
149 set_source_rgb(gc, 0, 0, 0);
153 cairo_rel_move_to(cr, dx, dy);
155 set_source_rgb(gc, tro->r, tro->g, tro->b);
156 cairo_show_text(cr, buffer);
159 static void render_depth_sample(struct graphics_context *gc, struct plot_data *entry, const text_render_options_t *tro)
161 int sec = entry->sec, decimals;
164 d = get_depth_units(entry->val, &decimals, NULL);
166 plot_text(gc, tro, sec, entry->val, "%.*f", decimals, d);
169 static void plot_text_samples(struct graphics_context *gc, struct plot_info *pi)
171 static const text_render_options_t deep = {14, 1.0, 0.2, 0.2, CENTER, TOP};
172 static const text_render_options_t shallow = {14, 1.0, 0.2, 0.2, CENTER, BOTTOM};
175 for (i = 0; i < pi->nr; i++) {
176 struct plot_data *entry = pi->entry + i;
178 if (entry->val < 2000)
181 if (entry == entry->max[2])
182 render_depth_sample(gc, entry, &deep);
184 if (entry == entry->min[2])
185 render_depth_sample(gc, entry, &shallow);
189 static void plot_depth_text(struct graphics_context *gc, struct plot_info *pi)
191 int maxtime, maxdepth;
193 /* Get plot scaling limits */
194 maxtime = get_maxtime(pi);
195 maxdepth = get_maxdepth(pi);
197 gc->leftx = 0; gc->rightx = maxtime;
198 gc->topy = 0; gc->bottomy = maxdepth;
200 plot_text_samples(gc, pi);
203 static void plot_smoothed_profile(struct graphics_context *gc, struct plot_info *pi)
206 struct plot_data *entry = pi->entry;
208 set_source_rgba(gc, 1, 0.2, 0.2, 0.20);
209 move_to(gc, entry->sec, entry->smoothed);
210 for (i = 1; i < pi->nr; i++) {
212 line_to(gc, entry->sec, entry->smoothed);
214 cairo_stroke(gc->cr);
217 static void plot_minmax_profile_minute(struct graphics_context *gc, struct plot_info *pi,
221 struct plot_data *entry = pi->entry;
223 set_source_rgba(gc, 1, 0.2, 1, a);
224 move_to(gc, entry->sec, entry->min[index]->val);
225 for (i = 1; i < pi->nr; i++) {
227 line_to(gc, entry->sec, entry->min[index]->val);
229 for (i = 1; i < pi->nr; i++) {
230 line_to(gc, entry->sec, entry->max[index]->val);
233 cairo_close_path(gc->cr);
237 static void plot_minmax_profile(struct graphics_context *gc, struct plot_info *pi)
241 plot_minmax_profile_minute(gc, pi, 2, 0.1);
242 plot_minmax_profile_minute(gc, pi, 1, 0.1);
243 plot_minmax_profile_minute(gc, pi, 0, 0.1);
246 static void plot_depth_profile(struct graphics_context *gc, struct plot_info *pi)
249 cairo_t *cr = gc->cr;
251 struct plot_data *entry;
252 int maxtime, maxdepth, marker;
254 /* Get plot scaling limits */
255 maxtime = get_maxtime(pi);
256 maxdepth = get_maxdepth(pi);
258 /* Time markers: every 5 min */
259 gc->leftx = 0; gc->rightx = maxtime;
260 gc->topy = 0; gc->bottomy = 1.0;
261 for (i = 5*60; i < maxtime; i += 5*60) {
266 /* Depth markers: every 30 ft or 10 m*/
267 gc->leftx = 0; gc->rightx = 1.0;
268 gc->topy = 0; gc->bottomy = maxdepth;
269 switch (output_units.length) {
270 case METERS: marker = 10000; break;
271 case FEET: marker = 9144; break; /* 30 ft */
274 set_source_rgba(gc, 1, 1, 1, 0.5);
275 for (i = marker; i < maxdepth; i += marker) {
281 /* Show mean depth */
282 set_source_rgba(gc, 1, 0.2, 0.2, 0.40);
283 move_to(gc, 0, pi->meandepth);
284 line_to(gc, 1, pi->meandepth);
287 gc->leftx = 0; gc->rightx = maxtime;
290 * These are good for debugging text placement etc,
291 * but not for actual display..
294 plot_smoothed_profile(gc, pi);
295 plot_minmax_profile(gc, pi);
298 set_source_rgba(gc, 1, 0.2, 0.2, 0.80);
300 /* Do the depth profile for the neat fill */
301 gc->topy = 0; gc->bottomy = maxdepth;
302 set_source_rgba(gc, 1, 0.2, 0.2, 0.20);
306 for (i = 0; i < pi->nr; i++, entry++)
307 line_to(gc, entry->sec, entry->val);
308 cairo_close_path(gc->cr);
310 set_source_rgba(gc, 1, 1, 1, 0.2);
311 cairo_fill_preserve(cr);
312 set_source_rgb(gc, 1, 1, 1);
318 /* Now do it again for the velocity colors */
320 for (i = 1; i < pi->nr; i++) {
323 /* we want to draw the segments in different colors
324 * representing the vertical velocity, so we need to
325 * chop this into short segments */
326 rgb_t color = rgb[entry->velocity];
328 set_source_rgb(gc, color.r, color.g, color.b);
329 move_to(gc, entry[-1].sec, entry[-1].val);
330 line_to(gc, sec, depth);
335 static int setup_temperature_limits(struct graphics_context *gc, struct plot_info *pi)
337 int maxtime, mintemp, maxtemp, delta;
339 /* Get plot scaling limits */
340 maxtime = get_maxtime(pi);
341 mintemp = pi->mintemp;
342 maxtemp = pi->maxtemp;
344 gc->leftx = 0; gc->rightx = maxtime;
345 /* Show temperatures in roughly the lower third, but make sure the scale
346 is at least somewhat reasonable */
347 delta = maxtemp - mintemp;
348 if (delta > 3000) { /* more than 3K in fluctuation */
349 gc->topy = maxtemp + delta*2;
350 gc->bottomy = mintemp - delta/2;
352 gc->topy = maxtemp + 1500 + delta*2;
353 gc->bottomy = mintemp - delta/2;
356 return maxtemp > mintemp;
359 static void plot_single_temp_text(struct graphics_context *gc, int sec, int mkelvin)
363 static const text_render_options_t tro = {12, 0.2, 0.2, 1.0, LEFT, TOP};
364 temperature_t temperature = { mkelvin };
366 if (output_units.temperature == FAHRENHEIT) {
367 deg = to_F(temperature);
368 unit = UTF8_DEGREE "F";
370 deg = to_C(temperature);
371 unit = UTF8_DEGREE "C";
373 plot_text(gc, &tro, sec, temperature.mkelvin, "%d%s", deg, unit);
376 static void plot_temperature_text(struct graphics_context *gc, struct plot_info *pi)
379 int last = 0, sec = 0;
380 int last_temperature = 0, last_printed_temp = 0;
382 if (!setup_temperature_limits(gc, pi))
385 for (i = 0; i < pi->nr; i++) {
386 struct plot_data *entry = pi->entry+i;
387 int mkelvin = entry->temperature;
391 last_temperature = mkelvin;
393 if (sec < last + 300)
396 plot_single_temp_text(gc,sec,mkelvin);
397 last_printed_temp = mkelvin;
399 /* it would be nice to print the end temperature, if it's different */
400 if (abs(last_temperature - last_printed_temp) > 500)
401 plot_single_temp_text(gc, sec, last_temperature);
404 static void plot_temperature_profile(struct graphics_context *gc, struct plot_info *pi)
407 cairo_t *cr = gc->cr;
410 if (!setup_temperature_limits(gc, pi))
413 set_source_rgba(gc, 0.2, 0.2, 1.0, 0.8);
414 for (i = 0; i < pi->nr; i++) {
415 struct plot_data *entry = pi->entry + i;
416 int mkelvin = entry->temperature;
417 int sec = entry->sec;
424 line_to(gc, sec, mkelvin);
426 move_to(gc, sec, mkelvin);
432 /* gets both the actual start and end pressure as well as the scaling factors */
433 static int get_cylinder_pressure_range(struct graphics_context *gc, struct plot_info *pi)
436 gc->rightx = get_maxtime(pi);
438 gc->bottomy = 0; gc->topy = pi->maxpressure * 1.5;
439 return pi->maxpressure != 0;
442 static void plot_cylinder_pressure(struct graphics_context *gc, struct plot_info *pi)
446 if (!get_cylinder_pressure_range(gc, pi))
449 set_source_rgba(gc, 0.2, 1.0, 0.2, 0.80);
451 move_to(gc, 0, pi->maxpressure);
452 for (i = 1; i < pi->nr; i++) {
454 struct plot_data *entry = pi->entry + i;
456 mbar = entry->pressure;
459 line_to(gc, entry->sec, mbar);
461 line_to(gc, pi->maxtime, pi->minpressure);
462 cairo_stroke(gc->cr);
465 static int mbar_to_PSI(int mbar)
467 pressure_t p = {mbar};
471 static void plot_cylinder_pressure_text(struct graphics_context *gc, struct plot_info *pi)
473 if (get_cylinder_pressure_range(gc, pi)) {
475 const char *unit = "bar";
477 switch (output_units.pressure) {
479 start = pi->maxpressure * 100;
480 end = pi->minpressure * 100;
484 start = (pi->maxpressure + 500) / 1000;
485 end = (pi->minpressure + 500) / 1000;
489 start = mbar_to_PSI(pi->maxpressure);
490 end = mbar_to_PSI(pi->minpressure);
495 text_render_options_t tro = {10, 0.2, 1.0, 0.2, LEFT, TOP};
496 plot_text(gc, &tro, 0, pi->maxpressure, "%d %s", start, unit);
497 plot_text(gc, &tro, pi->maxtime, pi->minpressure,
502 static void analyze_plot_info_minmax_minute(struct plot_data *entry, struct plot_data *first, struct plot_data *last, int index)
504 struct plot_data *p = entry;
505 int time = entry->sec;
506 int seconds = 90*(index+1);
507 struct plot_data *min, *max;
510 /* Go back 'seconds' in time */
512 if (p[-1].sec < time - seconds)
517 /* Then go forward until we hit an entry past the time */
523 if (p->sec > time + seconds)
532 entry->min[index] = min;
533 entry->max[index] = max;
534 entry->avg[index] = (avg + nr/2) / nr;
537 static void analyze_plot_info_minmax(struct plot_data *entry, struct plot_data *first, struct plot_data *last)
539 analyze_plot_info_minmax_minute(entry, first, last, 0);
540 analyze_plot_info_minmax_minute(entry, first, last, 1);
541 analyze_plot_info_minmax_minute(entry, first, last, 2);
544 static velocity_t velocity(int speed)
548 if (speed < -304) /* ascent faster than -60ft/min */
550 else if (speed < -152) /* above -30ft/min */
552 else if (speed < -76) /* -15ft/min */
554 else if (speed < -25) /* -5ft/min */
556 else if (speed < 25) /* very hard to find data, but it appears that the recommendations
557 for descent are usually about 2x ascent rate; still, we want
558 stable to mean stable */
560 else if (speed < 152) /* between 5 and 30ft/min is considered slow */
562 else if (speed < 304) /* up to 60ft/min is moderate */
564 else if (speed < 507) /* up to 100ft/min is fast */
566 else /* more than that is just crazy - you'll blow your ears out */
571 static struct plot_info *analyze_plot_info(struct plot_info *pi)
576 /* Do pressure min/max based on the non-surface data */
577 for (i = 0; i < nr; i++) {
578 struct plot_data *entry = pi->entry+i;
579 int pressure = entry->pressure;
580 int temperature = entry->temperature;
583 if (!pi->minpressure || pressure < pi->minpressure)
584 pi->minpressure = pressure;
585 if (pressure > pi->maxpressure)
586 pi->maxpressure = pressure;
590 if (!pi->mintemp || temperature < pi->mintemp)
591 pi->mintemp = temperature;
592 if (temperature > pi->maxtemp)
593 pi->maxtemp = temperature;
597 /* Smoothing function: 5-point triangular smooth */
598 for (i = 2; i < nr-1; i++) {
599 struct plot_data *entry = pi->entry+i;
603 val = entry[-2].val + 2*entry[-1].val + 3*entry[0].val + 2*entry[1].val + entry[2].val;
604 entry->smoothed = (val+4) / 9;
606 /* vertical velocity in mm/sec */
607 /* Linus wants to smooth this - let's at least look at the samples that aren't FAST or CRAZY */
608 if (entry[0].sec - entry[-1].sec) {
609 entry->velocity = velocity((entry[0].val - entry[-1].val) / (entry[0].sec - entry[-1].sec));
610 /* if our samples are short and we aren't too FAST*/
611 if (entry[0].sec - entry[-1].sec < 30 && entry->velocity < FAST) {
613 while (i+past > 0 && entry[0].sec - entry[past].sec < 30)
615 entry->velocity = velocity((entry[0].val - entry[past].val) /
616 (entry[0].sec - entry[past].sec));
619 entry->velocity = STABLE;
622 /* One-, two- and three-minute minmax data */
623 for (i = 0; i < nr; i++) {
624 struct plot_data *entry = pi->entry +i;
625 analyze_plot_info_minmax(entry, pi->entry, pi->entry+nr);
632 * Create a plot-info with smoothing and ranged min/max
634 * This also makes sure that we have extra empty events on both
635 * sides, so that you can do end-points without having to worry
638 static struct plot_info *create_plot_info(struct dive *dive)
640 int lastdepth, lastindex;
641 int i, nr = dive->samples + 4, sec;
642 size_t alloc_size = plot_info_size(nr);
643 struct plot_info *pi;
645 pi = malloc(alloc_size);
648 memset(pi, 0, alloc_size);
653 for (i = 0; i < dive->samples; i++) {
655 struct sample *sample = dive->sample+i;
656 struct plot_data *entry = pi->entry + i + 2;
658 sec = entry->sec = sample->time.seconds;
659 depth = entry->val = sample->depth.mm;
660 entry->pressure = sample->cylinderpressure.mbar;
661 entry->temperature = sample->temperature.mkelvin;
663 if (depth || lastdepth)
667 if (depth > pi->maxdepth)
668 pi->maxdepth = depth;
672 /* Fill in the last two entries with empty values but valid times */
673 i = dive->samples + 2;
674 pi->entry[i].sec = sec + 20;
675 pi->entry[i+1].sec = sec + 40;
677 pi->nr = lastindex+1;
678 pi->maxtime = pi->entry[lastindex].sec;
680 pi->minpressure = dive->cylinder[0].end.mbar;
681 pi->maxpressure = dive->cylinder[0].start.mbar;
683 pi->meandepth = dive->meandepth.mm;
685 return analyze_plot_info(pi);
688 void plot(struct graphics_context *gc, int w, int h, struct dive *dive)
691 struct plot_info *pi = create_plot_info(dive);
695 cairo_translate(gc->cr, topx, topy);
696 cairo_set_line_width(gc->cr, 2);
697 cairo_set_line_cap(gc->cr, CAIRO_LINE_CAP_ROUND);
698 cairo_set_line_join(gc->cr, CAIRO_LINE_JOIN_ROUND);
701 * We can use "cairo_translate()" because that doesn't
702 * scale line width etc. But the actual scaling we need
703 * do set up ourselves..
707 gc->maxx = (w - 2*topx);
708 gc->maxy = (h - 2*topy);
710 /* Temperature profile */
711 plot_temperature_profile(gc, pi);
713 /* Cylinder pressure plot */
714 plot_cylinder_pressure(gc, pi);
717 plot_depth_profile(gc, pi);
719 /* Text on top of all graphs.. */
720 plot_temperature_text(gc, pi);
721 plot_depth_text(gc, pi);
722 plot_cylinder_pressure_text(gc, pi);
724 /* Bounding box last */
725 gc->leftx = 0; gc->rightx = 1.0;
726 gc->topy = 0; gc->bottomy = 1.0;
728 set_source_rgb(gc, 1, 1, 1);
733 cairo_close_path(gc->cr);
734 cairo_stroke(gc->cr);