10 int selected_dive = 0;
13 * Cairo scaling really is horribly horribly mis-designed.
15 * Which is sad, because I really like Cairo otherwise. But
16 * the fact that the line width is scaled with the same scale
17 * as the coordinate system is a f*&%ing disaster. So we
18 * can't use it, and instead have this butt-ugly wrapper thing..
20 struct graphics_context {
23 double scalex, scaley;
26 /* Scale to 0,0 -> maxx,maxy */
27 #define SCALE(gc,x,y) (x)*gc->maxx/gc->scalex,(y)*gc->maxy/gc->scaley
29 static void move_to(struct graphics_context *gc, double x, double y)
31 cairo_move_to(gc->cr, SCALE(gc, x, y));
34 static void line_to(struct graphics_context *gc, double x, double y)
36 cairo_line_to(gc->cr, SCALE(gc, x, y));
39 #define ROUND_UP(x,y) ((((x)+(y)-1)/(y))*(y))
42 * When showing dive profiles, we scale things to the
43 * current dive. However, we don't scale past less than
44 * 30 minutes or 90 ft, just so that small dives show
47 static int round_seconds_up(int seconds)
49 return MAX(30*60, ROUND_UP(seconds, 60*10));
52 static int round_depth_up(depth_t depth)
54 unsigned mm = depth.mm;
56 return MAX(30000, ROUND_UP(mm+3000, 10000));
61 enum {CENTER,LEFT} allign;
62 } text_render_options_t;
64 static void plot_text(struct graphics_context *gc, text_render_options_t *tro,
65 double x, double y, const char *fmt, ...)
68 cairo_text_extents_t extents;
74 vsnprintf(buffer, sizeof(buffer), fmt, args);
77 cairo_text_extents(cr, buffer, &extents);
79 if (tro->allign == CENTER)
80 dx = -(extents.width/2 + extents.x_bearing);
81 dy = extents.height * 1.2;
84 cairo_rel_move_to(cr, dx, dy);
86 cairo_text_path(cr, buffer);
87 cairo_set_source_rgb(cr, 0, 0, 0);
91 cairo_rel_move_to(cr, dx, dy);
93 cairo_set_source_rgb(cr, tro->r, tro->g, tro->b);
94 cairo_show_text(cr, buffer);
98 * Find the next maximum point in a 10-minute window.
100 * We exit early if we hit "enough" of a depth reversal,
101 * which is roughly 10 feet.
103 static struct sample *next_minmax(struct sample *sample, struct sample *end, int minmax)
105 const int enough = 3000;
106 struct sample *result;
112 depthlimit = sample->depth.mm;
121 time = sample->time.seconds;
122 depth = sample->depth.mm;
125 if (depth <= depthlimit) {
126 if (depthlimit - depth > enough)
131 if (depth >= depthlimit) {
132 if (depth - depthlimit > enough)
144 static void render_depth_sample(struct graphics_context *gc, struct sample *sample)
146 text_render_options_t tro = {1.0, 0.2, 0.2, CENTER};
147 int sec = sample->time.seconds;
148 depth_t depth = sample->depth;
152 switch (output_units.length) {
154 d = depth.mm / 1000.0;
162 plot_text(gc, &tro, sec, depth.mm, fmt, d);
165 static void plot_text_samples(struct graphics_context *gc, struct sample *a, struct sample *b)
167 struct sample *max, *min;
171 if (b[-1].time.seconds - a->time.seconds < 3*60)
174 max = next_minmax(a, b, 1);
176 render_depth_sample(gc, max);
177 min = next_minmax(max, b, 0);
179 plot_text_samples(gc, min, b);
185 static void plot_depth_text(struct dive *dive, struct graphics_context *gc)
187 struct sample *sample, *end;
188 int maxtime, maxdepth;
190 /* Get plot scaling limits */
191 maxtime = round_seconds_up(dive->duration.seconds);
192 maxdepth = round_depth_up(dive->maxdepth);
194 gc->scalex = maxtime;
195 gc->scaley = maxdepth;
197 cairo_set_font_size(gc->cr, 14);
199 sample = dive->sample;
200 end = dive->sample + dive->samples;
202 plot_text_samples(gc, sample, end);
205 static void plot_depth_profile(struct dive *dive, struct graphics_context *gc)
207 cairo_t *cr = gc->cr;
208 int begins, sec, depth;
210 struct sample *sample;
211 int maxtime, maxdepth, marker;
213 samples = dive->samples;
217 cairo_set_line_width(gc->cr, 2);
219 /* Get plot scaling limits */
220 maxtime = round_seconds_up(dive->duration.seconds);
221 maxdepth = round_depth_up(dive->maxdepth);
223 /* Time markers: every 5 min */
224 gc->scalex = maxtime;
226 for (i = 5*60; i < maxtime; i += 5*60) {
231 /* Depth markers: every 30 ft or 10 m*/
233 gc->scaley = maxdepth;
234 switch (output_units.length) {
235 case METERS: marker = 10000; break;
236 case FEET: marker = 9144; break; /* 30 ft */
239 cairo_set_source_rgba(cr, 1, 1, 1, 0.5);
240 for (i = marker; i < maxdepth; i += marker) {
246 /* Show mean depth */
247 cairo_set_source_rgba(cr, 1, 0.2, 0.2, 0.40);
248 move_to(gc, 0, dive->meandepth.mm);
249 line_to(gc, 1, dive->meandepth.mm);
252 gc->scalex = maxtime;
254 sample = dive->sample;
255 cairo_set_source_rgba(cr, 1, 0.2, 0.2, 0.80);
256 begins = sample->time.seconds;
257 move_to(gc, sample->time.seconds, sample->depth.mm);
258 for (i = 1; i < dive->samples; i++) {
260 sec = sample->time.seconds;
261 if (sec <= maxtime) {
262 depth = sample->depth.mm;
263 line_to(gc, sec, depth);
267 line_to(gc, MIN(sec,maxtime), 0);
268 line_to(gc, begins, 0);
269 cairo_close_path(cr);
270 cairo_set_source_rgba(cr, 1, 0.2, 0.2, 0.20);
271 cairo_fill_preserve(cr);
272 cairo_set_source_rgba(cr, 1, 0.2, 0.2, 0.80);
276 /* gets both the actual start and end pressure as well as the scaling factors */
277 static int get_cylinder_pressure_range(struct dive *dive, struct graphics_context *gc,
278 pressure_t *startp, pressure_t *endp)
283 gc->scalex = round_seconds_up(dive->duration.seconds);
288 startp->mbar = endp->mbar = 0;
290 for (i = 0; i < dive->samples; i++) {
292 struct sample *sample = dive->sample + i;
294 /* FIXME! We only track cylinder 0 right now */
295 if (sample->cylinderindex)
297 mbar = sample->cylinderpressure.mbar;
311 gc->scaley = max * 1.5;
315 static void plot_cylinder_pressure(struct dive *dive, struct graphics_context *gc)
319 if (!get_cylinder_pressure_range(dive, gc, NULL, NULL))
322 cairo_set_source_rgba(gc->cr, 0.2, 1.0, 0.2, 0.80);
324 move_to(gc, 0, dive->cylinder[0].start.mbar);
325 for (i = 1; i < dive->samples; i++) {
327 struct sample *sample = dive->sample + i;
329 mbar = sample->cylinderpressure.mbar;
332 sec = sample->time.seconds;
333 if (sec <= dive->duration.seconds)
334 line_to(gc, sec, mbar);
337 * We may have "surface time" events, in which case we don't go
338 * back to dive duration
340 if (sec < dive->duration.seconds)
341 line_to(gc, dive->duration.seconds, dive->cylinder[0].end.mbar);
342 cairo_stroke(gc->cr);
346 * Return air usage (in liters).
348 static double calculate_airuse(struct dive *dive)
353 for (i = 0; i < MAX_CYLINDERS; i++) {
354 cylinder_t *cyl = dive->cylinder + i;
355 int size = cyl->type.size.mliter;
361 kilo_atm = (cyl->start.mbar - cyl->end.mbar) / 1013250.0;
363 /* Liters of air at 1 atm == milliliters at 1k atm*/
364 airuse += kilo_atm * size;
369 static void plot_info(struct dive *dive, struct graphics_context *gc)
371 text_render_options_t tro = {0.2, 1.0, 0.2, LEFT};
372 const double liters_per_cuft = 28.317;
376 airuse = calculate_airuse(dive);
380 /* I really need to start addign some unit setting thing */
381 switch (output_units.volume) {
387 airuse /= liters_per_cuft;
390 plot_text(gc, &tro, 0.8, 0.8, "vol: %4.2f %s", airuse, unit);
391 if (dive->duration.seconds) {
392 double pressure = 1 + (dive->meandepth.mm / 10000.0);
393 double sac = airuse / pressure * 60 / dive->duration.seconds;
394 plot_text(gc, &tro, 0.8, 0.85, "SAC: %4.2f %s/min", sac, unit);
398 static void plot_cylinder_pressure_text(struct dive *dive, struct graphics_context *gc)
400 pressure_t startp, endp;
402 cairo_set_font_size(gc->cr, 10);
404 if (get_cylinder_pressure_range(dive, gc, &startp, &endp)) {
406 const char *unit = "bar";
408 switch (output_units.pressure) {
410 start = startp.mbar * 100;
411 end = startp.mbar * 100;
415 start = (startp.mbar + 500) / 1000;
416 end = (endp.mbar + 500) / 1000;
420 start = to_PSI(startp);
426 text_render_options_t tro = {0.2, 1.0, 0.2, LEFT};
427 plot_text(gc, &tro, 0, startp.mbar, "%d %s", start, unit);
428 plot_text(gc, &tro, dive->duration.seconds, endp.mbar,
433 static void plot(struct graphics_context *gc, int w, int h, struct dive *dive)
439 cairo_translate(gc->cr, topx, topy);
442 * We can use "cairo_translate()" because that doesn't
443 * scale line width etc. But the actual scaling we need
444 * do set up ourselves..
448 gc->maxx = (w - 2*topx);
449 gc->maxy = (h - 2*topy);
451 /* Cylinder pressure plot */
452 plot_cylinder_pressure(dive, gc);
455 plot_depth_profile(dive, gc);
457 /* Text on top of all graphs.. */
458 plot_depth_text(dive, gc);
459 plot_cylinder_pressure_text(dive, gc);
461 /* And info box in the lower right corner.. */
462 gc->scalex = gc->scaley = 1.0;
465 /* Bounding box last */
466 cairo_set_source_rgb(gc->cr, 1, 1, 1);
471 cairo_close_path(gc->cr);
472 cairo_stroke(gc->cr);
476 static gboolean expose_event(GtkWidget *widget, GdkEventExpose *event, gpointer data)
478 struct dive *dive = current_dive;
479 struct graphics_context gc;
482 w = widget->allocation.width;
483 h = widget->allocation.height;
485 gc.cr = gdk_cairo_create(widget->window);
486 cairo_set_source_rgb(gc.cr, 0, 0, 0);
490 plot(&gc, w, h, dive);
492 cairo_destroy(gc.cr);
497 GtkWidget *dive_profile_widget(void)
501 da = gtk_drawing_area_new();
502 gtk_widget_set_size_request(da, 450, 350);
503 g_signal_connect(da, "expose_event", G_CALLBACK(expose_event), NULL);