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Plot dive profile slightly more intelligently.

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This actually creates a bounding box and some scale markers.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2011-08-31 14:15:50 -07:00
parent a11dbbdb18
commit eed9538101
1 changed files with 82 additions and 15 deletions
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97
profile.c
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@ -7,29 +7,96 @@
int selected_dive = 0;
#define ROUND_UP(x,y) ((((x)+(y)-1)/(y))*(y))
#define MAX(x,y) ((x) > (y) ? (x) : (y))
static int round_seconds_up(int seconds)
{
return MAX(30, ROUND_UP(seconds, 60*10));
}
static int round_feet_up(int feet)
{
return MAX(45, ROUND_UP(feet+5, 15));
}
/* Scale to 0,0 -> maxx,maxy */
#define SCALE(x,y) (x)*maxx/scalex+topx,(y)*maxy/scaley+topy
static void plot(cairo_t *cr, int w, int h, struct dive *dive, int samples, struct sample *sample)
{
int i;
double topx, topy, maxx, maxy;
double scalex, scaley;
int maxtime, maxdepth;
topx = w / 20.0;
topy = h / 20.0;
maxx = (w - 2*topx);
maxy = (h - 2*topy);
cairo_set_line_width(cr, 2);
/* Get plot scaling limits */
maxtime = round_seconds_up(dive->duration.seconds);
maxdepth = round_feet_up(to_feet(dive->maxdepth));
/* Depth markers: every 15 ft */
scalex = 1.0;
scaley = maxdepth;
cairo_set_source_rgba(cr, 1, 1, 1, 0.5);
for (i = 15; i < maxdepth; i += 15) {
cairo_move_to(cr, SCALE(0, i));
cairo_line_to(cr, SCALE(1, i));
}
/* Time markers: every 5 min */
scalex = maxtime;
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));
}
cairo_stroke(cr);
scaley = maxdepth;
/* Depth profile */
cairo_set_source_rgba(cr, 1, 0.2, 0.2, 0.80);
cairo_move_to(cr, SCALE(sample->time.seconds, to_feet(sample->depth)));
for (i = 1; i < dive->samples; i++) {
sample++;
cairo_line_to(cr, SCALE(sample->time.seconds, to_feet(sample->depth)));
}
cairo_stroke(cr);
/* 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);
}
static gboolean expose_event(GtkWidget *widget, GdkEventExpose *event, gpointer data)
{
struct dive *dive = dive_table.dives[selected_dive];
cairo_t *cr;
int i;
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);
gdk_cairo_rectangle(cr, &event->area);
cairo_fill(cr);
cairo_paint(cr);
cairo_set_line_width(cr, 3);
cairo_set_source_rgb(cr, 1, 1, 1);
if (dive->samples) {
struct sample *sample = dive->sample;
cairo_move_to(cr, sample->time.seconds / 5, to_feet(sample->depth) * 3);
for (i = 1; i < dive->samples; i++) {
sample++;
cairo_line_to(cr, sample->time.seconds / 5, to_feet(sample->depth) * 3);
}
cairo_stroke(cr);
}
if (dive->samples)
plot(cr, w, h, dive, dive->samples, dive->sample);
cairo_destroy(cr);