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#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <time.h>
#include "dive.h"
#include "display.h"
#include "divelist.h"
int selected_dive = 0;
#define ROUND_UP(x,y) ((((x)+(y)-1)/(y))*(y))
/*
* When showing dive profiles, we scale things to the
* current dive. However, we don't scale past less than
* 30 minutes or 90 ft, just so that small dives show
* up as such.
*/
static int round_seconds_up(int seconds)
{
return MAX(30*60, ROUND_UP(seconds, 60*10));
}
static int round_feet_up(int feet)
{
return MAX(90, ROUND_UP(feet+5, 15));
}
static void plot_text(cairo_t *cr, double x, double y, const char *fmt, ...)
{
cairo_text_extents_t extents;
char buffer[80];
va_list args;
va_start(args, fmt);
vsnprintf(buffer, sizeof(buffer), fmt, args);
va_end(args);
cairo_text_extents(cr, buffer, &extents);
x -= extents.width/2 + extents.x_bearing;
y += extents.height * 1.2;
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);
cairo_set_source_rgb(cr, 1, 0, 0);
cairo_show_text(cr, buffer);
}
/*
* Find the next maximum point in a 10-minute window.
*
* We exit early if we hit "enough" of a depth reversal,
* which is roughly 10 feet.
*/
static int next_minmax(struct dive *dive, int index, int minmax)
{
const int enough = 3000;
int timelimit, depthlimit, result;
struct sample *sample = dive->sample + index;
if (index >= dive->samples)
return 0;
timelimit = 24*60*60;
depthlimit = sample->depth.mm;
result = 0;
for (;;) {
int time, depth;
index++;
sample++;
if (index >= dive->samples)
break;
time = sample->time.seconds;
depth = sample->depth.mm;
if (time > timelimit)
break;
if (minmax) {
if (depth <= depthlimit) {
if (depthlimit - depth > enough)
break;
continue;
}
} else {
if (depth >= depthlimit) {
if (depth - depthlimit > enough)
break;
continue;
}
}
result = index;
depthlimit = depth;
/* Look up to ten minutes into the future */
timelimit = time + 600;
}
return result;
}
/* Scale to 0,0 -> maxx,maxy */
#define SCALE(x,y) (x)*maxx/scalex+topx,(y)*maxy/scaley+topy
static void plot_profile(struct dive *dive, cairo_t *cr,
double topx, double topy, double maxx, double maxy)
{
double scalex, scaley;
int begins, sec, depth;
int i, samples;
struct sample *sample;
int maxtime, maxdepth, mindepth;
samples = dive->samples;
if (!samples)
return;
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));
/* 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));
}
/* 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));
}
cairo_stroke(cr);
/* Show mean depth */
cairo_set_source_rgba(cr, 1, 0.2, 0.2, 0.40);
cairo_move_to(cr, SCALE(0, to_feet(dive->meandepth)));
cairo_line_to(cr, SCALE(1, to_feet(dive->meandepth)));
cairo_stroke(cr);
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, to_feet(sample->depth)));
for (i = 1; i < dive->samples; i++) {
sample++;
sec = sample->time.seconds;
depth = to_feet(sample->depth);
cairo_line_to(cr, SCALE(sec, depth));
}
scaley = 1.0;
cairo_line_to(cr, SCALE(sec, 0));
cairo_line_to(cr, SCALE(begins, 0));
cairo_close_path(cr);
cairo_set_source_rgba(cr, 1, 0.2, 0.2, 0.20);
cairo_fill_preserve(cr);
cairo_set_source_rgba(cr, 1, 0.2, 0.2, 0.80);
cairo_stroke(cr);
scalex = maxtime;
scaley = maxdepth;
maxdepth = mindepth = 0;
maxtime = 0;
cairo_set_font_size(cr, 14);
cairo_set_source_rgb(cr, 1, 0.2, 0.2);
i = 0;
while ((i = next_minmax(dive, i, 1)) != 0) {
sample = dive->sample+i;
sec = sample->time.seconds;
depth = to_feet(sample->depth);
plot_text(cr, SCALE(sec, depth), "%d ft", depth);
i = next_minmax(dive, i, 0);
if (!i)
break;
}
}
static int get_cylinder_pressure_range(struct dive *dive, double *scalex, double *scaley)
{
int i;
double min, max;
*scalex = round_seconds_up(dive->duration.seconds);
max = 0;
min = 5000;
for (i = 0; i < dive->samples; i++) {
struct sample *sample = dive->sample + i;
double bar;
/* FIXME! We only track cylinder 0 right now */
if (sample->cylinderindex)
continue;
if (!sample->cylinderpressure.mbar)
continue;
bar = sample->cylinderpressure.mbar;
if (bar < min)
min = bar;
if (bar > max)
max = bar;
}
if (!max)
return 0;
*scaley = max * 1.5;
return 1;
}
static void plot_cylinder_pressure(struct dive *dive, cairo_t *cr,
double topx, double topy, double maxx, double maxy)
{
int i, sec = -1;
double scalex, scaley;
if (!get_cylinder_pressure_range(dive, &scalex, &scaley))
return;
cairo_set_source_rgba(cr, 0.2, 1.0, 0.2, 0.80);
cairo_move_to(cr, SCALE(0, dive->cylinder[0].start.mbar));
for (i = 1; i < dive->samples; i++) {
int mbar;
struct sample *sample = dive->sample + i;
mbar = sample->cylinderpressure.mbar;
if (!mbar)
continue;
sec = sample->time.seconds;
cairo_line_to(cr, SCALE(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);
}
static void plot(cairo_t *cr, int w, int h, struct dive *dive)
{
double topx, topy, maxx, maxy;
double scalex, scaley;
topx = w / 20.0;
topy = h / 20.0;
maxx = (w - 2*topx);
maxy = (h - 2*topy);
/* Depth profile */
plot_profile(dive, cr, topx, topy, maxx, maxy);
/* Cylinder pressure plot? */
plot_cylinder_pressure(dive, cr, topx, topy, maxx, maxy);
/* 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 = current_dive;
cairo_t *cr;
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);
if (dive)
plot(cr, w, h, dive);
cairo_destroy(cr);
return FALSE;
}
GtkWidget *dive_profile_widget(void)
{
GtkWidget *da;
da = gtk_drawing_area_new();
gtk_widget_set_size_request(da, 450, 350);
g_signal_connect(da, "expose_event", G_CALLBACK(expose_event), NULL);
return da;
}
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