int selected_dive = 0;
+/*
+ * Cairo scaling really is horribly horribly mis-designed.
+ *
+ * Which is sad, because I really like Cairo otherwise. But
+ * the fact that the line width is scaled with the same scale
+ * as the coordinate system is a f*&%ing disaster. So we
+ * can't use it, and instead have this butt-ugly wrapper thing..
+ */
+struct graphics_context {
+ cairo_t *cr;
+ double maxx, maxy;
+ double scalex, scaley;
+};
+
+/* Scale to 0,0 -> maxx,maxy */
+#define SCALE(gc,x,y) (x)*gc->maxx/gc->scalex,(y)*gc->maxy/gc->scaley
+
+static void move_to(struct graphics_context *gc, double x, double y)
+{
+ cairo_move_to(gc->cr, SCALE(gc, x, y));
+}
+
+static void line_to(struct graphics_context *gc, double x, double y)
+{
+ cairo_line_to(gc->cr, SCALE(gc, x, y));
+}
+
#define ROUND_UP(x,y) ((((x)+(y)-1)/(y))*(y))
/*
enum {CENTER,LEFT} allign;
} text_render_options_t;
-static void plot_text(cairo_t *cr, text_render_options_t *tro,
+static void plot_text(struct graphics_context *gc, text_render_options_t *tro,
double x, double y, const char *fmt, ...)
{
+ cairo_t *cr = gc->cr;
cairo_text_extents_t extents;
+ double dx, dy;
char buffer[80];
va_list args;
va_end(args);
cairo_text_extents(cr, buffer, &extents);
-
+ dx = 0;
if (tro->allign == CENTER)
- x -= extents.width/2 + extents.x_bearing;
- y += extents.height * 1.2;
+ dx = -(extents.width/2 + extents.x_bearing);
+ dy = extents.height * 1.2;
+
+ move_to(gc, x, y);
+ cairo_rel_move_to(cr, dx, dy);
- cairo_move_to(cr, x, y);
cairo_text_path(cr, buffer);
cairo_set_source_rgb(cr, 0, 0, 0);
cairo_stroke(cr);
- cairo_move_to(cr, x, y);
+ move_to(gc, x, y);
+ cairo_rel_move_to(cr, dx, dy);
+
cairo_set_source_rgb(cr, tro->r, tro->g, tro->b);
cairo_show_text(cr, buffer);
}
return result;
}
-/* Scale to 0,0 -> maxx,maxy */
-#define SCALE(x,y) (x)*maxx/scalex,(y)*maxy/scaley
-
-void plot_text_samples(struct dive *dive, cairo_t *cr,
- double maxx, double maxy,
- double scalex, double scaley,
+void plot_text_samples(struct dive *dive, struct graphics_context *gc,
struct sample *a, struct sample *b)
{
struct sample *max, *min;
double d;
min = next_minmax(max, b, 0);
- plot_text_samples(dive, cr, maxx, maxy, scalex, scaley, a, max);
+ plot_text_samples(dive, gc, a, max);
if (min) {
- plot_text_samples(dive, cr, maxx, maxy, scalex, scaley, max, min);
- plot_text_samples(dive, cr, maxx, maxy, scalex, scaley, min, b);
+ plot_text_samples(dive, gc, max, min);
+ plot_text_samples(dive, gc, min, b);
} else
- plot_text_samples(dive, cr, maxx, maxy, scalex, scaley, max, b);
+ plot_text_samples(dive, gc, max, b);
switch (output_units.length) {
case METERS:
break;
}
- plot_text(cr, &tro, SCALE(sec, depth.mm), fmt, d);
+ plot_text(gc, &tro, sec, depth.mm, fmt, d);
return;
}
}
-static void plot_depth_text(struct dive *dive, cairo_t *cr,
- double maxx, double maxy)
+static void plot_depth_text(struct dive *dive, struct graphics_context *gc)
{
struct sample *sample, *end;
- double scalex, scaley;
int maxtime, maxdepth;
/* Get plot scaling limits */
maxtime = round_seconds_up(dive->duration.seconds);
maxdepth = round_depth_up(dive->maxdepth);
- scalex = maxtime;
- scaley = maxdepth;
+ gc->scalex = maxtime;
+ gc->scaley = maxdepth;
- cairo_set_font_size(cr, 14);
- cairo_set_source_rgb(cr, 1, 0.2, 0.2);
+ cairo_set_font_size(gc->cr, 14);
/*
* We never take the last sample into account.
sample = dive->sample;
end = dive->sample + dive->samples - 1;
- plot_text_samples(dive, cr, maxx, maxy, scalex, scaley, sample, end);
+ plot_text_samples(dive, gc, sample, end);
}
-static void plot_depth_profile(struct dive *dive, cairo_t *cr,
- double maxx, double maxy)
+static void plot_depth_profile(struct dive *dive, struct graphics_context *gc)
{
- double scalex, scaley;
+ cairo_t *cr = gc->cr;
int begins, sec, depth;
int i, samples;
struct sample *sample;
if (!samples)
return;
- cairo_set_line_width(cr, 2);
+ cairo_set_line_width(gc->cr, 2);
/* Get plot scaling limits */
maxtime = round_seconds_up(dive->duration.seconds);
maxdepth = round_depth_up(dive->maxdepth);
/* Time markers: every 5 min */
- scalex = maxtime;
- scaley = 1.0;
+ gc->scalex = maxtime;
+ gc->scaley = 1.0;
for (i = 5*60; i < maxtime; i += 5*60) {
- cairo_move_to(cr, SCALE(i, 0));
- cairo_line_to(cr, SCALE(i, 1));
+ move_to(gc, i, 0);
+ line_to(gc, i, 1);
}
/* Depth markers: every 30 ft or 10 m*/
- scalex = 1.0;
- scaley = maxdepth;
+ gc->scalex = 1.0;
+ gc->scaley = maxdepth;
switch (output_units.length) {
case METERS: marker = 10000; break;
case FEET: marker = 9144; break; /* 30 ft */
cairo_set_source_rgba(cr, 1, 1, 1, 0.5);
for (i = marker; i < maxdepth; i += marker) {
- cairo_move_to(cr, SCALE(0, i));
- cairo_line_to(cr, SCALE(1, i));
+ move_to(gc, 0, i);
+ line_to(gc, 1, i);
}
cairo_stroke(cr);
/* Show mean depth */
cairo_set_source_rgba(cr, 1, 0.2, 0.2, 0.40);
- cairo_move_to(cr, SCALE(0, dive->meandepth.mm));
- cairo_line_to(cr, SCALE(1, dive->meandepth.mm));
+ move_to(gc, 0, dive->meandepth.mm);
+ line_to(gc, 1, dive->meandepth.mm);
cairo_stroke(cr);
- scalex = maxtime;
+ gc->scalex = maxtime;
sample = dive->sample;
cairo_set_source_rgba(cr, 1, 0.2, 0.2, 0.80);
begins = sample->time.seconds;
- cairo_move_to(cr, SCALE(sample->time.seconds, sample->depth.mm));
+ move_to(gc, sample->time.seconds, sample->depth.mm);
for (i = 1; i < dive->samples; i++) {
sample++;
sec = sample->time.seconds;
if (sec <= maxtime) {
depth = sample->depth.mm;
- cairo_line_to(cr, SCALE(sec, depth));
+ line_to(gc, sec, depth);
}
}
- scaley = 1.0;
- cairo_line_to(cr, SCALE(MIN(sec,maxtime), 0));
- cairo_line_to(cr, SCALE(begins, 0));
+ gc->scaley = 1.0;
+ line_to(gc, MIN(sec,maxtime), 0);
+ line_to(gc, begins, 0);
cairo_close_path(cr);
cairo_set_source_rgba(cr, 1, 0.2, 0.2, 0.20);
cairo_fill_preserve(cr);
}
/* gets both the actual start and end pressure as well as the scaling factors */
-static int get_cylinder_pressure_range(struct dive *dive, double *scalex, double *scaley,
- pressure_t *startp, pressure_t *endp)
+static int get_cylinder_pressure_range(struct dive *dive, struct graphics_context *gc,
+ pressure_t *startp, pressure_t *endp)
{
int i;
int min, max;
- *scalex = round_seconds_up(dive->duration.seconds);
+ gc->scalex = round_seconds_up(dive->duration.seconds);
max = 0;
min = 5000000;
endp->mbar = min;
if (!max)
return 0;
- *scaley = max * 1.5;
+ gc->scaley = max * 1.5;
return 1;
}
-static void plot_cylinder_pressure(struct dive *dive, cairo_t *cr,
- double maxx, double maxy)
+static void plot_cylinder_pressure(struct dive *dive, struct graphics_context *gc)
{
int i, sec = -1;
- double scalex, scaley;
- if (!get_cylinder_pressure_range(dive, &scalex, &scaley, NULL, NULL))
+ if (!get_cylinder_pressure_range(dive, gc, NULL, NULL))
return;
- cairo_set_source_rgba(cr, 0.2, 1.0, 0.2, 0.80);
+ cairo_set_source_rgba(gc->cr, 0.2, 1.0, 0.2, 0.80);
- cairo_move_to(cr, SCALE(0, dive->cylinder[0].start.mbar));
+ move_to(gc, 0, dive->cylinder[0].start.mbar);
for (i = 1; i < dive->samples; i++) {
int mbar;
struct sample *sample = dive->sample + i;
continue;
sec = sample->time.seconds;
if (sec <= dive->duration.seconds)
- cairo_line_to(cr, SCALE(sec, mbar));
+ line_to(gc, sec, mbar);
}
/*
* We may have "surface time" events, in which case we don't go
* back to dive duration
*/
if (sec < dive->duration.seconds)
- cairo_line_to(cr, SCALE(dive->duration.seconds, dive->cylinder[0].end.mbar));
- cairo_stroke(cr);
+ line_to(gc, dive->duration.seconds, dive->cylinder[0].end.mbar);
+ cairo_stroke(gc->cr);
}
/*
return airuse;
}
-static void plot_info(struct dive *dive, cairo_t *cr,
- double maxx, double maxy)
+static void plot_info(struct dive *dive, struct graphics_context *gc)
{
text_render_options_t tro = {0.2, 1.0, 0.2, LEFT};
const double liters_per_cuft = 28.317;
airuse /= liters_per_cuft;
break;
}
- plot_text(cr, &tro, maxx*0.8, maxy*0.8, "vol: %4.2f %s", airuse, unit);
+ plot_text(gc, &tro, 0.8, 0.8, "vol: %4.2f %s", airuse, unit);
if (dive->duration.seconds) {
double pressure = 1 + (dive->meandepth.mm / 10000.0);
double sac = airuse / pressure * 60 / dive->duration.seconds;
- plot_text(cr, &tro, maxx*0.8, maxy*0.85, "SAC: %4.2f %s/min", sac, unit);
+ plot_text(gc, &tro, 0.8, 0.85, "SAC: %4.2f %s/min", sac, unit);
}
}
-static void plot_cylinder_pressure_text(struct dive *dive, cairo_t *cr,
- double maxx, double maxy)
+static void plot_cylinder_pressure_text(struct dive *dive, struct graphics_context *gc)
{
- double scalex, scaley;
pressure_t startp, endp;
- cairo_set_font_size(cr, 10);
+ cairo_set_font_size(gc->cr, 10);
- if (get_cylinder_pressure_range(dive, &scalex, &scaley,
- &startp, &endp)) {
+ if (get_cylinder_pressure_range(dive, gc, &startp, &endp)) {
int start, end;
const char *unit = "bar";
}
text_render_options_t tro = {0.2, 1.0, 0.2, LEFT};
- plot_text(cr, &tro, SCALE(0, startp.mbar), "%d %s", start, unit);
- plot_text(cr, &tro, SCALE(dive->duration.seconds, endp.mbar),
+ plot_text(gc, &tro, 0, startp.mbar, "%d %s", start, unit);
+ plot_text(gc, &tro, dive->duration.seconds, endp.mbar,
"%d %s", end, unit);
}
}
-static void plot(cairo_t *cr, int w, int h, struct dive *dive)
+static void plot(struct graphics_context *gc, int w, int h, struct dive *dive)
{
- double topx, topy, maxx, maxy;
- double scalex, scaley;
+ double topx, topy;
topx = w / 20.0;
topy = h / 20.0;
- maxx = (w - 2*topx);
- maxy = (h - 2*topy);
- cairo_translate(cr, topx, topy);
+ cairo_translate(gc->cr, topx, topy);
+
+ /*
+ * We can use "cairo_translate()" because that doesn't
+ * scale line width etc. But the actual scaling we need
+ * do set up ourselves..
+ *
+ * Snif. What a pity.
+ */
+ gc->maxx = (w - 2*topx);
+ gc->maxy = (h - 2*topy);
/* Cylinder pressure plot */
- plot_cylinder_pressure(dive, cr, maxx, maxy);
+ plot_cylinder_pressure(dive, gc);
/* Depth profile */
- plot_depth_profile(dive, cr, maxx, maxy);
+ plot_depth_profile(dive, gc);
/* Text on top of all graphs.. */
- plot_depth_text(dive, cr, maxx, maxy);
- plot_cylinder_pressure_text(dive, cr, maxx, maxy);
+ plot_depth_text(dive, gc);
+ plot_cylinder_pressure_text(dive, gc);
/* And info box in the lower right corner.. */
- plot_info(dive, cr, maxx, maxy);
+ gc->scalex = gc->scaley = 1.0;
+ plot_info(dive, gc);
/* Bounding box last */
- scalex = scaley = 1.0;
- cairo_set_source_rgb(cr, 1, 1, 1);
- cairo_move_to(cr, SCALE(0,0));
- cairo_line_to(cr, SCALE(0,1));
- cairo_line_to(cr, SCALE(1,1));
- cairo_line_to(cr, SCALE(1,0));
- cairo_close_path(cr);
- cairo_stroke(cr);
+ cairo_set_source_rgb(gc->cr, 1, 1, 1);
+ move_to(gc, 0, 0);
+ line_to(gc, 0, 1);
+ line_to(gc, 1, 1);
+ line_to(gc, 1, 0);
+ cairo_close_path(gc->cr);
+ cairo_stroke(gc->cr);
}
static gboolean expose_event(GtkWidget *widget, GdkEventExpose *event, gpointer data)
{
struct dive *dive = current_dive;
- cairo_t *cr;
+ struct graphics_context gc;
int w,h;
w = widget->allocation.width;
h = widget->allocation.height;
- cr = gdk_cairo_create(widget->window);
- cairo_set_source_rgb(cr, 0, 0, 0);
- cairo_paint(cr);
+ gc.cr = gdk_cairo_create(widget->window);
+ cairo_set_source_rgb(gc.cr, 0, 0, 0);
+ cairo_paint(gc.cr);
if (dive)
- plot(cr, w, h, dive);
+ plot(&gc, w, h, dive);
- cairo_destroy(cr);
+ cairo_destroy(gc.cr);
return FALSE;
}
projects / ext / subsurface.git / commitdiff