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 minimum/maximum point.
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)
170 a = next_minmax(a, b, 1);
173 render_depth_sample(gc, a);
174 a = next_minmax(a, b, 0);
180 static void plot_depth_text(struct dive *dive, struct graphics_context *gc)
182 struct sample *sample, *end;
183 int maxtime, maxdepth;
185 /* Get plot scaling limits */
186 maxtime = round_seconds_up(dive->duration.seconds);
187 maxdepth = round_depth_up(dive->maxdepth);
189 gc->scalex = maxtime;
190 gc->scaley = maxdepth;
192 cairo_set_font_size(gc->cr, 14);
194 sample = dive->sample;
195 end = dive->sample + dive->samples;
197 plot_text_samples(gc, sample, end);
200 static void plot_depth_profile(struct dive *dive, struct graphics_context *gc)
202 cairo_t *cr = gc->cr;
203 int begins, sec, depth;
205 struct sample *sample;
206 int maxtime, maxdepth, marker;
208 samples = dive->samples;
212 cairo_set_line_width(gc->cr, 2);
214 /* Get plot scaling limits */
215 maxtime = round_seconds_up(dive->duration.seconds);
216 maxdepth = round_depth_up(dive->maxdepth);
218 /* Time markers: every 5 min */
219 gc->scalex = maxtime;
221 for (i = 5*60; i < maxtime; i += 5*60) {
226 /* Depth markers: every 30 ft or 10 m*/
228 gc->scaley = maxdepth;
229 switch (output_units.length) {
230 case METERS: marker = 10000; break;
231 case FEET: marker = 9144; break; /* 30 ft */
234 cairo_set_source_rgba(cr, 1, 1, 1, 0.5);
235 for (i = marker; i < maxdepth; i += marker) {
241 /* Show mean depth */
242 cairo_set_source_rgba(cr, 1, 0.2, 0.2, 0.40);
243 move_to(gc, 0, dive->meandepth.mm);
244 line_to(gc, 1, dive->meandepth.mm);
247 gc->scalex = maxtime;
249 sample = dive->sample;
250 cairo_set_source_rgba(cr, 1, 0.2, 0.2, 0.80);
251 begins = sample->time.seconds;
252 move_to(gc, sample->time.seconds, sample->depth.mm);
253 for (i = 1; i < dive->samples; i++) {
255 sec = sample->time.seconds;
256 if (sec <= maxtime) {
257 depth = sample->depth.mm;
258 line_to(gc, sec, depth);
262 line_to(gc, MIN(sec,maxtime), 0);
263 line_to(gc, begins, 0);
264 cairo_close_path(cr);
265 cairo_set_source_rgba(cr, 1, 0.2, 0.2, 0.20);
266 cairo_fill_preserve(cr);
267 cairo_set_source_rgba(cr, 1, 0.2, 0.2, 0.80);
271 /* gets both the actual start and end pressure as well as the scaling factors */
272 static int get_cylinder_pressure_range(struct dive *dive, struct graphics_context *gc,
273 pressure_t *startp, pressure_t *endp)
278 gc->scalex = round_seconds_up(dive->duration.seconds);
283 startp->mbar = endp->mbar = 0;
285 for (i = 0; i < dive->samples; i++) {
287 struct sample *sample = dive->sample + i;
289 /* FIXME! We only track cylinder 0 right now */
290 if (sample->cylinderindex)
292 mbar = sample->cylinderpressure.mbar;
306 gc->scaley = max * 1.5;
310 static void plot_cylinder_pressure(struct dive *dive, struct graphics_context *gc)
314 if (!get_cylinder_pressure_range(dive, gc, NULL, NULL))
317 cairo_set_source_rgba(gc->cr, 0.2, 1.0, 0.2, 0.80);
319 move_to(gc, 0, dive->cylinder[0].start.mbar);
320 for (i = 1; i < dive->samples; i++) {
322 struct sample *sample = dive->sample + i;
324 mbar = sample->cylinderpressure.mbar;
327 sec = sample->time.seconds;
328 if (sec <= dive->duration.seconds)
329 line_to(gc, sec, mbar);
332 * We may have "surface time" events, in which case we don't go
333 * back to dive duration
335 if (sec < dive->duration.seconds)
336 line_to(gc, dive->duration.seconds, dive->cylinder[0].end.mbar);
337 cairo_stroke(gc->cr);
341 * Return air usage (in liters).
343 static double calculate_airuse(struct dive *dive)
348 for (i = 0; i < MAX_CYLINDERS; i++) {
349 cylinder_t *cyl = dive->cylinder + i;
350 int size = cyl->type.size.mliter;
356 kilo_atm = (cyl->start.mbar - cyl->end.mbar) / 1013250.0;
358 /* Liters of air at 1 atm == milliliters at 1k atm*/
359 airuse += kilo_atm * size;
364 static void plot_info(struct dive *dive, struct graphics_context *gc)
366 text_render_options_t tro = {0.2, 1.0, 0.2, LEFT};
367 const double liters_per_cuft = 28.317;
371 airuse = calculate_airuse(dive);
375 /* I really need to start addign some unit setting thing */
376 switch (output_units.volume) {
382 airuse /= liters_per_cuft;
385 plot_text(gc, &tro, 0.8, 0.8, "vol: %4.2f %s", airuse, unit);
386 if (dive->duration.seconds) {
387 double pressure = 1 + (dive->meandepth.mm / 10000.0);
388 double sac = airuse / pressure * 60 / dive->duration.seconds;
389 plot_text(gc, &tro, 0.8, 0.85, "SAC: %4.2f %s/min", sac, unit);
393 static void plot_cylinder_pressure_text(struct dive *dive, struct graphics_context *gc)
395 pressure_t startp, endp;
397 cairo_set_font_size(gc->cr, 10);
399 if (get_cylinder_pressure_range(dive, gc, &startp, &endp)) {
401 const char *unit = "bar";
403 switch (output_units.pressure) {
405 start = startp.mbar * 100;
406 end = startp.mbar * 100;
410 start = (startp.mbar + 500) / 1000;
411 end = (endp.mbar + 500) / 1000;
415 start = to_PSI(startp);
421 text_render_options_t tro = {0.2, 1.0, 0.2, LEFT};
422 plot_text(gc, &tro, 0, startp.mbar, "%d %s", start, unit);
423 plot_text(gc, &tro, dive->duration.seconds, endp.mbar,
428 static void plot(struct graphics_context *gc, int w, int h, struct dive *dive)
434 cairo_translate(gc->cr, topx, topy);
437 * We can use "cairo_translate()" because that doesn't
438 * scale line width etc. But the actual scaling we need
439 * do set up ourselves..
443 gc->maxx = (w - 2*topx);
444 gc->maxy = (h - 2*topy);
446 /* Cylinder pressure plot */
447 plot_cylinder_pressure(dive, gc);
450 plot_depth_profile(dive, gc);
452 /* Text on top of all graphs.. */
453 plot_depth_text(dive, gc);
454 plot_cylinder_pressure_text(dive, gc);
456 /* And info box in the lower right corner.. */
457 gc->scalex = gc->scaley = 1.0;
460 /* Bounding box last */
461 cairo_set_source_rgb(gc->cr, 1, 1, 1);
466 cairo_close_path(gc->cr);
467 cairo_stroke(gc->cr);
471 static gboolean expose_event(GtkWidget *widget, GdkEventExpose *event, gpointer data)
473 struct dive *dive = current_dive;
474 struct graphics_context gc;
477 w = widget->allocation.width;
478 h = widget->allocation.height;
480 gc.cr = gdk_cairo_create(widget->window);
481 cairo_set_source_rgb(gc.cr, 0, 0, 0);
485 plot(&gc, w, h, dive);
487 cairo_destroy(gc.cr);
492 GtkWidget *dive_profile_widget(void)
496 da = gtk_drawing_area_new();
497 gtk_widget_set_size_request(da, 450, 350);
498 g_signal_connect(da, "expose_event", G_CALLBACK(expose_event), NULL);