e88695ff72
Text notes need to be last, so that they don't get stepped on by the other graph elements. Also, separate the depth text plot out into a function of its own. Tidier that way. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
328 lines
7.1 KiB
C
328 lines
7.1 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <time.h>
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#include "dive.h"
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#include "display.h"
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#include "divelist.h"
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int selected_dive = 0;
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#define ROUND_UP(x,y) ((((x)+(y)-1)/(y))*(y))
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/*
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* When showing dive profiles, we scale things to the
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* current dive. However, we don't scale past less than
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* 30 minutes or 90 ft, just so that small dives show
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* up as such.
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*/
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static int round_seconds_up(int seconds)
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{
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return MAX(30*60, ROUND_UP(seconds, 60*10));
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}
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static int round_feet_up(int feet)
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{
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return MAX(90, ROUND_UP(feet+5, 15));
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}
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static void plot_text(cairo_t *cr, double x, double y, const char *fmt, ...)
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{
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cairo_text_extents_t extents;
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char buffer[80];
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va_list args;
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va_start(args, fmt);
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vsnprintf(buffer, sizeof(buffer), fmt, args);
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va_end(args);
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cairo_text_extents(cr, buffer, &extents);
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x -= extents.width/2 + extents.x_bearing;
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y += extents.height * 1.2;
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cairo_move_to(cr, x, y);
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cairo_text_path(cr, buffer);
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cairo_set_source_rgb(cr, 0, 0, 0);
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cairo_stroke(cr);
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cairo_move_to(cr, x, y);
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cairo_set_source_rgb(cr, 1, 0, 0);
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cairo_show_text(cr, buffer);
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}
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/*
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* Find the next maximum point in a 10-minute window.
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*
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* We exit early if we hit "enough" of a depth reversal,
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* which is roughly 10 feet.
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*/
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static int next_minmax(struct dive *dive, int index, int minmax)
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{
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const int enough = 3000;
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int timelimit, depthlimit, result;
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struct sample *sample = dive->sample + index;
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if (index >= dive->samples)
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return 0;
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timelimit = 24*60*60;
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depthlimit = sample->depth.mm;
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result = 0;
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for (;;) {
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int time, depth;
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index++;
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sample++;
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if (index >= dive->samples)
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break;
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time = sample->time.seconds;
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depth = sample->depth.mm;
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if (time > timelimit)
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break;
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if (minmax) {
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if (depth <= depthlimit) {
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if (depthlimit - depth > enough)
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break;
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continue;
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}
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} else {
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if (depth >= depthlimit) {
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if (depth - depthlimit > enough)
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break;
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continue;
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}
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}
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result = index;
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depthlimit = depth;
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/* Look up to ten minutes into the future */
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timelimit = time + 600;
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}
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return result;
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}
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/* Scale to 0,0 -> maxx,maxy */
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#define SCALE(x,y) (x)*maxx/scalex+topx,(y)*maxy/scaley+topy
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static void plot_depth_text(struct dive *dive, cairo_t *cr,
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double topx, double topy, double maxx, double maxy)
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{
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double scalex, scaley;
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int maxtime, maxdepth;
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int i;
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/* Get plot scaling limits */
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maxtime = round_seconds_up(dive->duration.seconds);
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maxdepth = round_feet_up(to_feet(dive->maxdepth));
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scalex = maxtime;
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scaley = maxdepth;
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cairo_set_font_size(cr, 14);
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cairo_set_source_rgb(cr, 1, 0.2, 0.2);
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i = 0;
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while ((i = next_minmax(dive, i, 1)) != 0) {
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struct sample *sample = dive->sample+i;
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int sec = sample->time.seconds;
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int depth = to_feet(sample->depth);
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plot_text(cr, SCALE(sec, depth), "%d ft", depth);
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i = next_minmax(dive, i, 0);
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if (!i)
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break;
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}
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}
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static void plot_depth_profile(struct dive *dive, cairo_t *cr,
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double topx, double topy, double maxx, double maxy)
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{
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double scalex, scaley;
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int begins, sec, depth;
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int i, samples;
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struct sample *sample;
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int maxtime, maxdepth;
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samples = dive->samples;
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if (!samples)
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return;
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cairo_set_line_width(cr, 2);
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/* Get plot scaling limits */
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maxtime = round_seconds_up(dive->duration.seconds);
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maxdepth = round_feet_up(to_feet(dive->maxdepth));
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/* Time markers: every 5 min */
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scalex = maxtime;
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scaley = 1.0;
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for (i = 5*60; i < maxtime; i += 5*60) {
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cairo_move_to(cr, SCALE(i, 0));
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cairo_line_to(cr, SCALE(i, 1));
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}
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/* Depth markers: every 15 ft */
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scalex = 1.0;
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scaley = maxdepth;
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cairo_set_source_rgba(cr, 1, 1, 1, 0.5);
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for (i = 15; i < maxdepth; i += 15) {
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cairo_move_to(cr, SCALE(0, i));
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cairo_line_to(cr, SCALE(1, i));
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}
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cairo_stroke(cr);
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/* Show mean depth */
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cairo_set_source_rgba(cr, 1, 0.2, 0.2, 0.40);
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cairo_move_to(cr, SCALE(0, to_feet(dive->meandepth)));
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cairo_line_to(cr, SCALE(1, to_feet(dive->meandepth)));
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cairo_stroke(cr);
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scalex = maxtime;
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sample = dive->sample;
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cairo_set_source_rgba(cr, 1, 0.2, 0.2, 0.80);
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begins = sample->time.seconds;
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cairo_move_to(cr, SCALE(sample->time.seconds, to_feet(sample->depth)));
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for (i = 1; i < dive->samples; i++) {
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sample++;
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sec = sample->time.seconds;
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depth = to_feet(sample->depth);
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cairo_line_to(cr, SCALE(sec, depth));
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}
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scaley = 1.0;
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cairo_line_to(cr, SCALE(sec, 0));
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cairo_line_to(cr, SCALE(begins, 0));
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cairo_close_path(cr);
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cairo_set_source_rgba(cr, 1, 0.2, 0.2, 0.20);
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cairo_fill_preserve(cr);
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cairo_set_source_rgba(cr, 1, 0.2, 0.2, 0.80);
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cairo_stroke(cr);
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}
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static int get_cylinder_pressure_range(struct dive *dive, double *scalex, double *scaley)
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{
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int i;
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double min, max;
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*scalex = round_seconds_up(dive->duration.seconds);
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max = 0;
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min = 5000;
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for (i = 0; i < dive->samples; i++) {
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struct sample *sample = dive->sample + i;
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double bar;
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/* FIXME! We only track cylinder 0 right now */
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if (sample->cylinderindex)
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continue;
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if (!sample->cylinderpressure.mbar)
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continue;
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bar = sample->cylinderpressure.mbar;
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if (bar < min)
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min = bar;
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if (bar > max)
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max = bar;
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}
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if (!max)
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return 0;
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*scaley = max * 1.5;
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return 1;
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}
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static void plot_cylinder_pressure(struct dive *dive, cairo_t *cr,
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double topx, double topy, double maxx, double maxy)
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{
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int i, sec = -1;
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double scalex, scaley;
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if (!get_cylinder_pressure_range(dive, &scalex, &scaley))
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return;
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cairo_set_source_rgba(cr, 0.2, 1.0, 0.2, 0.80);
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cairo_move_to(cr, SCALE(0, dive->cylinder[0].start.mbar));
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for (i = 1; i < dive->samples; i++) {
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int mbar;
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struct sample *sample = dive->sample + i;
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mbar = sample->cylinderpressure.mbar;
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if (!mbar)
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continue;
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sec = sample->time.seconds;
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cairo_line_to(cr, SCALE(sec, mbar));
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}
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/*
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* We may have "surface time" events, in which case we don't go
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* back to dive duration
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*/
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if (sec < dive->duration.seconds)
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cairo_line_to(cr, SCALE(dive->duration.seconds, dive->cylinder[0].end.mbar));
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cairo_stroke(cr);
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}
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static void plot(cairo_t *cr, int w, int h, struct dive *dive)
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{
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double topx, topy, maxx, maxy;
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double scalex, scaley;
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topx = w / 20.0;
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topy = h / 20.0;
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maxx = (w - 2*topx);
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maxy = (h - 2*topy);
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/* Cylinder pressure plot */
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plot_cylinder_pressure(dive, cr, topx, topy, maxx, maxy);
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/* Depth profile */
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plot_depth_profile(dive, cr, topx, topy, maxx, maxy);
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/* Text on top of all graphs.. */
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plot_depth_text(dive, cr, topx, topy, maxx, maxy);
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/* Bounding box last */
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scalex = scaley = 1.0;
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cairo_set_source_rgb(cr, 1, 1, 1);
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cairo_move_to(cr, SCALE(0,0));
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cairo_line_to(cr, SCALE(0,1));
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cairo_line_to(cr, SCALE(1,1));
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cairo_line_to(cr, SCALE(1,0));
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cairo_close_path(cr);
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cairo_stroke(cr);
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}
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static gboolean expose_event(GtkWidget *widget, GdkEventExpose *event, gpointer data)
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{
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struct dive *dive = current_dive;
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cairo_t *cr;
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int w,h;
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w = widget->allocation.width;
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h = widget->allocation.height;
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cr = gdk_cairo_create(widget->window);
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cairo_set_source_rgb(cr, 0, 0, 0);
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cairo_paint(cr);
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if (dive)
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plot(cr, w, h, dive);
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cairo_destroy(cr);
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return FALSE;
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}
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GtkWidget *dive_profile_widget(void)
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{
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GtkWidget *da;
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da = gtk_drawing_area_new();
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gtk_widget_set_size_request(da, 450, 350);
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g_signal_connect(da, "expose_event", G_CALLBACK(expose_event), NULL);
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return da;
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}
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