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subsurface/profile.c
Linus Torvalds e919a0f2ea Add quick hack for "no sample pressure but tank index changed" case 
This isn't right if you switch back to the same cylinder multiple times,
but for the first time it kind of works - just take the beginning
cylinder pressure if we have one.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-10-20 22:25:38 +03:00

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/* profile.c */
/* creates all the necessary data for drawing the dive profile
* uses cairo to draw it
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <time.h>
#include "dive.h"
#include "display.h"
#include "divelist.h"
int selected_dive = 0;
typedef enum { STABLE, SLOW, MODERATE, FAST, CRAZY } velocity_t;
/* Plot info with smoothing, velocity indication
* and one-, two- and three-minute minimums and maximums */
struct plot_info {
int nr;
int maxtime;
int meandepth, maxdepth;
int minpressure, maxpressure;
int endpressure; /* start pressure better be max pressure */
int mintemp, maxtemp;
struct plot_data {
unsigned int same_cylinder:1;
int sec;
int pressure, temperature;
/* Depth info */
int val;
int smoothed;
velocity_t velocity;
struct plot_data *min[3];
struct plot_data *max[3];
int avg[3];
} entry[];
};
/* convert velocity to colors */
typedef struct { double r, g, b; } rgb_t;
static const rgb_t rgb[] = {
[STABLE] = {0.0, 0.4, 0.0},
[SLOW] = {0.4, 0.8, 0.0},
[MODERATE] = {0.8, 0.8, 0.0},
[FAST] = {0.8, 0.5, 0.0},
[CRAZY] = {1.0, 0.0, 0.0},
};
#define plot_info_size(nr) (sizeof(struct plot_info) + (nr)*sizeof(struct plot_data))
/* Scale to 0,0 -> maxx,maxy */
#define SCALEX(gc,x) (((x)-gc->leftx)/(gc->rightx-gc->leftx)*gc->maxx)
#define SCALEY(gc,y) (((y)-gc->topy)/(gc->bottomy-gc->topy)*gc->maxy)
#define SCALE(gc,x,y) SCALEX(gc,x),SCALEY(gc,y)
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));
}
static void set_source_rgba(struct graphics_context *gc, double r, double g, double b, double a)
{
/*
* For printers, we still honor 'a', but ignore colors
* for now. Black is white and white is black
*/
if (gc->printer) {
double sum = r+g+b;
if (sum > 0.8)
r = g = b = 0;
else
r = g = b = 1;
}
cairo_set_source_rgba(gc->cr, r, g, b, a);
}
void set_source_rgb(struct graphics_context *gc, double r, double g, double b)
{
set_source_rgba(gc, r, g, b, 1);
}
#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.
* we also need to add 180 seconds at the end so the min/max
* plots correctly
*/
static int get_maxtime(struct plot_info *pi)
{
int seconds = pi->maxtime;
/* min 30 minutes, rounded up to 5 minutes, with at least 2.5 minutes to spare */
return MAX(30*60, ROUND_UP(seconds+150, 60*5));
}
static int get_maxdepth(struct plot_info *pi)
{
unsigned mm = pi->maxdepth;
/* Minimum 30m, rounded up to 10m, with at least 3m to spare */
return MAX(30000, ROUND_UP(mm+3000, 10000));
}
typedef struct {
int size;
double r,g,b;
double hpos, vpos;
} text_render_options_t;
#define RIGHT (-1.0)
#define CENTER (-0.5)
#define LEFT (0.0)
#define TOP (1)
#define MIDDLE (0)
#define BOTTOM (-1)
static void plot_text(struct graphics_context *gc, const text_render_options_t *tro,
double x, double y, const char *fmt, ...)
{
cairo_t *cr = gc->cr;
cairo_font_extents_t fe;
cairo_text_extents_t extents;
double dx, dy;
char buffer[80];
va_list args;
va_start(args, fmt);
vsnprintf(buffer, sizeof(buffer), fmt, args);
va_end(args);
cairo_set_font_size(cr, tro->size);
cairo_font_extents(cr, &fe);
cairo_text_extents(cr, buffer, &extents);
dx = tro->hpos * extents.width + extents.x_bearing;
dy = tro->vpos * extents.height + fe.descent;
move_to(gc, x, y);
cairo_rel_move_to(cr, dx, dy);
cairo_text_path(cr, buffer);
set_source_rgb(gc, 0, 0, 0);
cairo_stroke(cr);
move_to(gc, x, y);
cairo_rel_move_to(cr, dx, dy);
set_source_rgb(gc, tro->r, tro->g, tro->b);
cairo_show_text(cr, buffer);
}
static void plot_one_event(struct graphics_context *gc, struct plot_info *pi, struct event *event, const text_render_options_t *tro)
{
int i, depth = 0;
int x,y;
for (i = 0; i < pi->nr; i++) {
struct plot_data *data = pi->entry + i;
if (event->time.seconds < data->sec)
break;
depth = data->val;
}
/* draw a little tirangular marker and attach tooltip */
x = SCALEX(gc, event->time.seconds);
y = SCALEY(gc, depth);
set_source_rgba(gc, 1.0, 1.0, 0.1, 0.8);
cairo_move_to(gc->cr, x-15, y+6);
cairo_line_to(gc->cr, x-3 , y+6);
cairo_line_to(gc->cr, x-9, y-6);
cairo_line_to(gc->cr, x-15, y+6);
cairo_stroke_preserve(gc->cr);
cairo_fill(gc->cr);
set_source_rgba(gc, 0.0, 0.0, 0.0, 0.8);
cairo_move_to(gc->cr, x-9, y-3);
cairo_line_to(gc->cr, x-9, y+1);
cairo_move_to(gc->cr, x-9, y+4);
cairo_line_to(gc->cr, x-9, y+4);
cairo_stroke(gc->cr);
attach_tooltip(x-15, y-6, 12, 12, event->name);
}
static void plot_events(struct graphics_context *gc, struct plot_info *pi, struct dive *dive)
{
static const text_render_options_t tro = {14, 1.0, 0.2, 0.2, CENTER, TOP};
struct event *event = dive->events;
if (gc->printer)
return;
while (event) {
plot_one_event(gc, pi, event, &tro);
event = event->next;
}
}
static void render_depth_sample(struct graphics_context *gc, struct plot_data *entry, const text_render_options_t *tro)
{
int sec = entry->sec, decimals;
double d;
d = get_depth_units(entry->val, &decimals, NULL);
plot_text(gc, tro, sec, entry->val, "%.*f", decimals, d);
}
static void plot_text_samples(struct graphics_context *gc, struct plot_info *pi)
{
static const text_render_options_t deep = {14, 1.0, 0.2, 0.2, CENTER, TOP};
static const text_render_options_t shallow = {14, 1.0, 0.2, 0.2, CENTER, BOTTOM};
int i;
for (i = 0; i < pi->nr; i++) {
struct plot_data *entry = pi->entry + i;
if (entry->val < 2000)
continue;
if (entry == entry->max[2])
render_depth_sample(gc, entry, &deep);
if (entry == entry->min[2])
render_depth_sample(gc, entry, &shallow);
}
}
static void plot_depth_text(struct graphics_context *gc, struct plot_info *pi)
{
int maxtime, maxdepth;
/* Get plot scaling limits */
maxtime = get_maxtime(pi);
maxdepth = get_maxdepth(pi);
gc->leftx = 0; gc->rightx = maxtime;
gc->topy = 0; gc->bottomy = maxdepth;
plot_text_samples(gc, pi);
}
static void plot_smoothed_profile(struct graphics_context *gc, struct plot_info *pi)
{
int i;
struct plot_data *entry = pi->entry;
set_source_rgba(gc, 1, 0.2, 0.2, 0.20);
move_to(gc, entry->sec, entry->smoothed);
for (i = 1; i < pi->nr; i++) {
entry++;
line_to(gc, entry->sec, entry->smoothed);
}
cairo_stroke(gc->cr);
}
static void plot_minmax_profile_minute(struct graphics_context *gc, struct plot_info *pi,
int index, double a)
{
int i;
struct plot_data *entry = pi->entry;
set_source_rgba(gc, 1, 0.2, 1, a);
move_to(gc, entry->sec, entry->min[index]->val);
for (i = 1; i < pi->nr; i++) {
entry++;
line_to(gc, entry->sec, entry->min[index]->val);
}
for (i = 1; i < pi->nr; i++) {
line_to(gc, entry->sec, entry->max[index]->val);
entry--;
}
cairo_close_path(gc->cr);
cairo_fill(gc->cr);
}
static void plot_minmax_profile(struct graphics_context *gc, struct plot_info *pi)
{
if (gc->printer)
return;
plot_minmax_profile_minute(gc, pi, 2, 0.1);
plot_minmax_profile_minute(gc, pi, 1, 0.1);
plot_minmax_profile_minute(gc, pi, 0, 0.1);
}
static void plot_depth_profile(struct graphics_context *gc, struct plot_info *pi)
{
int i;
cairo_t *cr = gc->cr;
int sec, depth;
struct plot_data *entry;
int maxtime, maxdepth, marker;
/* Get plot scaling limits */
maxtime = get_maxtime(pi);
maxdepth = get_maxdepth(pi);
/* Time markers: every 5 min */
gc->leftx = 0; gc->rightx = maxtime;
gc->topy = 0; gc->bottomy = 1.0;
for (i = 5*60; i < maxtime; i += 5*60) {
move_to(gc, i, 0);
line_to(gc, i, 1);
}
/* Depth markers: every 30 ft or 10 m*/
gc->leftx = 0; gc->rightx = 1.0;
gc->topy = 0; gc->bottomy = maxdepth;
switch (output_units.length) {
case METERS: marker = 10000; break;
case FEET: marker = 9144; break; /* 30 ft */
}
set_source_rgba(gc, 1, 1, 1, 0.5);
for (i = marker; i < maxdepth; i += marker) {
move_to(gc, 0, i);
line_to(gc, 1, i);
}
cairo_stroke(cr);
/* Show mean depth */
if (! gc->printer) {
set_source_rgba(gc, 1, 0.2, 0.2, 0.40);
move_to(gc, 0, pi->meandepth);
line_to(gc, 1, pi->meandepth);
cairo_stroke(cr);
}
gc->leftx = 0; gc->rightx = maxtime;
/*
* These are good for debugging text placement etc,
* but not for actual display..
*/
if (0) {
plot_smoothed_profile(gc, pi);
plot_minmax_profile(gc, pi);
}
set_source_rgba(gc, 1, 0.2, 0.2, 0.80);
/* Do the depth profile for the neat fill */
gc->topy = 0; gc->bottomy = maxdepth;
set_source_rgba(gc, 1, 0.2, 0.2, 0.20);
entry = pi->entry;
move_to(gc, 0, 0);
for (i = 0; i < pi->nr; i++, entry++)
line_to(gc, entry->sec, entry->val);
cairo_close_path(gc->cr);
if (gc->printer) {
set_source_rgba(gc, 1, 1, 1, 0.2);
cairo_fill_preserve(cr);
set_source_rgb(gc, 1, 1, 1);
cairo_stroke(cr);
return;
}
cairo_fill(gc->cr);
/* Now do it again for the velocity colors */
entry = pi->entry;
for (i = 1; i < pi->nr; i++) {
entry++;
sec = entry->sec;
/* we want to draw the segments in different colors
* representing the vertical velocity, so we need to
* chop this into short segments */
rgb_t color = rgb[entry->velocity];
depth = entry->val;
set_source_rgb(gc, color.r, color.g, color.b);
move_to(gc, entry[-1].sec, entry[-1].val);
line_to(gc, sec, depth);
cairo_stroke(cr);
}
}
static int setup_temperature_limits(struct graphics_context *gc, struct plot_info *pi)
{
int maxtime, mintemp, maxtemp, delta;
/* Get plot scaling limits */
maxtime = get_maxtime(pi);
mintemp = pi->mintemp;
maxtemp = pi->maxtemp;
gc->leftx = 0; gc->rightx = maxtime;
/* Show temperatures in roughly the lower third, but make sure the scale
is at least somewhat reasonable */
delta = maxtemp - mintemp;
if (delta > 3000) { /* more than 3K in fluctuation */
gc->topy = maxtemp + delta*2;
gc->bottomy = mintemp - delta/2;
} else {
gc->topy = maxtemp + 1500 + delta*2;
gc->bottomy = mintemp - delta/2;
}
return maxtemp > mintemp;
}
static void plot_single_temp_text(struct graphics_context *gc, int sec, int mkelvin)
{
int deg;
const char *unit;
static const text_render_options_t tro = {12, 0.2, 0.2, 1.0, LEFT, TOP};
temperature_t temperature = { mkelvin };
if (output_units.temperature == FAHRENHEIT) {
deg = to_F(temperature);
unit = UTF8_DEGREE "F";
} else {
deg = to_C(temperature);
unit = UTF8_DEGREE "C";
}
plot_text(gc, &tro, sec, temperature.mkelvin, "%d%s", deg, unit);
}
static void plot_temperature_text(struct graphics_context *gc, struct plot_info *pi)
{
int i;
int last = 0, sec = 0;
int last_temperature = 0, last_printed_temp = 0;
if (!setup_temperature_limits(gc, pi))
return;
for (i = 0; i < pi->nr; i++) {
struct plot_data *entry = pi->entry+i;
int mkelvin = entry->temperature;
if (!mkelvin)
continue;
last_temperature = mkelvin;
sec = entry->sec;
if (sec < last + 300)
continue;
last = sec;
plot_single_temp_text(gc,sec,mkelvin);
last_printed_temp = mkelvin;
}
/* it would be nice to print the end temperature, if it's different */
if (abs(last_temperature - last_printed_temp) > 500)
plot_single_temp_text(gc, sec, last_temperature);
}
static void plot_temperature_profile(struct graphics_context *gc, struct plot_info *pi)
{
int i;
cairo_t *cr = gc->cr;
int last = 0;
if (!setup_temperature_limits(gc, pi))
return;
set_source_rgba(gc, 0.2, 0.2, 1.0, 0.8);
for (i = 0; i < pi->nr; i++) {
struct plot_data *entry = pi->entry + i;
int mkelvin = entry->temperature;
int sec = entry->sec;
if (!mkelvin) {
if (!last)
continue;
mkelvin = last;
}
if (last)
line_to(gc, sec, mkelvin);
else
move_to(gc, sec, mkelvin);
last = mkelvin;
}
cairo_stroke(cr);
}
/* gets both the actual start and end pressure as well as the scaling factors */
static int get_cylinder_pressure_range(struct graphics_context *gc, struct plot_info *pi)
{
gc->leftx = 0;
gc->rightx = get_maxtime(pi);
gc->bottomy = 0; gc->topy = pi->maxpressure * 1.5;
return pi->maxpressure != 0;
}
static void plot_cylinder_pressure(struct graphics_context *gc, struct plot_info *pi)
{
int i;
int have_pressure = FALSE;
if (!get_cylinder_pressure_range(gc, pi))
return;
set_source_rgba(gc, 0.2, 1.0, 0.2, 0.80);
for (i = 0; i < pi->nr; i++) {
int mbar;
struct plot_data *entry = pi->entry + i;
mbar = entry->pressure;
if (!mbar)
continue;
have_pressure = TRUE;
if (entry->same_cylinder)
line_to(gc, entry->sec, mbar);
else
move_to(gc, entry->sec, mbar);
}
/* if we have valid samples, we don't want to draw a line to the minpressure
* but just end wherever the dive ended (think valve shutdowns during dive)
* but that doesn't work so well if we have only max and min
*/
if (! have_pressure)
line_to(gc, pi->maxtime, pi->minpressure);
cairo_stroke(gc->cr);
}
static int mbar_to_PSI(int mbar)
{
pressure_t p = {mbar};
return to_PSI(p);
}
static void plot_cylinder_pressure_text(struct graphics_context *gc, struct plot_info *pi)
{
if (get_cylinder_pressure_range(gc, pi)) {
int start, end;
const char *unit = "bar";
switch (output_units.pressure) {
case PASCAL:
start = pi->maxpressure * 100;
end = pi->endpressure * 100;
unit = "pascal";
break;
case BAR:
start = (pi->maxpressure + 500) / 1000;
end = (pi->endpressure + 500) / 1000;
unit = "bar";
break;
case PSI:
start = mbar_to_PSI(pi->maxpressure);
end = mbar_to_PSI(pi->endpressure);
unit = "psi";
break;
}
text_render_options_t tro = {10, 0.2, 1.0, 0.2, LEFT, TOP};
plot_text(gc, &tro, 0, pi->maxpressure, "%d %s", start, unit);
plot_text(gc, &tro, pi->maxtime, pi->endpressure,
"%d %s", end, unit);
}
}
static void analyze_plot_info_minmax_minute(struct plot_data *entry, struct plot_data *first, struct plot_data *last, int index)
{
struct plot_data *p = entry;
int time = entry->sec;
int seconds = 90*(index+1);
struct plot_data *min, *max;
int avg, nr;
/* Go back 'seconds' in time */
while (p > first) {
if (p[-1].sec < time - seconds)
break;
p--;
}
/* Then go forward until we hit an entry past the time */
min = max = p;
avg = p->val;
nr = 1;
while (++p < last) {
int val = p->val;
if (p->sec > time + seconds)
break;
avg += val;
nr ++;
if (val < min->val)
min = p;
if (val > max->val)
max = p;
}
entry->min[index] = min;
entry->max[index] = max;
entry->avg[index] = (avg + nr/2) / nr;
}
static void analyze_plot_info_minmax(struct plot_data *entry, struct plot_data *first, struct plot_data *last)
{
analyze_plot_info_minmax_minute(entry, first, last, 0);
analyze_plot_info_minmax_minute(entry, first, last, 1);
analyze_plot_info_minmax_minute(entry, first, last, 2);
}
static velocity_t velocity(int speed)
{
velocity_t v;
if (speed < -304) /* ascent faster than -60ft/min */
v = CRAZY;
else if (speed < -152) /* above -30ft/min */
v = FAST;
else if (speed < -76) /* -15ft/min */
v = MODERATE;
else if (speed < -25) /* -5ft/min */
v = SLOW;
else if (speed < 25) /* very hard to find data, but it appears that the recommendations
for descent are usually about 2x ascent rate; still, we want
stable to mean stable */
v = STABLE;
else if (speed < 152) /* between 5 and 30ft/min is considered slow */
v = SLOW;
else if (speed < 304) /* up to 60ft/min is moderate */
v = MODERATE;
else if (speed < 507) /* up to 100ft/min is fast */
v = FAST;
else /* more than that is just crazy - you'll blow your ears out */
v = CRAZY;
return v;
}
static struct plot_info *analyze_plot_info(struct plot_info *pi)
{
int i;
int nr = pi->nr;
/* Do pressure min/max based on the non-surface data */
for (i = 0; i < nr; i++) {
struct plot_data *entry = pi->entry+i;
int pressure = entry->pressure;
int temperature = entry->temperature;
if (pressure) {
if (!pi->minpressure || pressure < pi->minpressure)
pi->minpressure = pressure;
if (pressure > pi->maxpressure)
pi->maxpressure = pressure;
}
if (temperature) {
if (!pi->mintemp || temperature < pi->mintemp)
pi->mintemp = temperature;
if (temperature > pi->maxtemp)
pi->maxtemp = temperature;
}
}
/* Smoothing function: 5-point triangular smooth */
for (i = 2; i < nr; i++) {
struct plot_data *entry = pi->entry+i;
int val;
if (i < nr-2) {
val = entry[-2].val + 2*entry[-1].val + 3*entry[0].val + 2*entry[1].val + entry[2].val;
entry->smoothed = (val+4) / 9;
}
/* vertical velocity in mm/sec */
/* Linus wants to smooth this - let's at least look at the samples that aren't FAST or CRAZY */
if (entry[0].sec - entry[-1].sec) {
entry->velocity = velocity((entry[0].val - entry[-1].val) / (entry[0].sec - entry[-1].sec));
/* if our samples are short and we aren't too FAST*/
if (entry[0].sec - entry[-1].sec < 15 && entry->velocity < FAST) {
int past = -2;
while (i+past > 0 && entry[0].sec - entry[past].sec < 15)
past--;
entry->velocity = velocity((entry[0].val - entry[past].val) /
(entry[0].sec - entry[past].sec));
}
} else
entry->velocity = STABLE;
}
/* One-, two- and three-minute minmax data */
for (i = 0; i < nr; i++) {
struct plot_data *entry = pi->entry +i;
analyze_plot_info_minmax(entry, pi->entry, pi->entry+nr);
}
return pi;
}
/*
* Create a plot-info with smoothing and ranged min/max
*
* This also makes sure that we have extra empty events on both
* sides, so that you can do end-points without having to worry
* about it.
*/
static struct plot_info *create_plot_info(struct dive *dive)
{
int cylinderindex = -1;
int lastdepth, lastindex;
int i, nr = dive->samples + 4, sec;
size_t alloc_size = plot_info_size(nr);
struct plot_info *pi;
pi = malloc(alloc_size);
if (!pi)
return pi;
memset(pi, 0, alloc_size);
pi->nr = nr;
sec = 0;
lastindex = 0;
lastdepth = -1;
for (i = 0; i < dive->samples; i++) {
int depth;
struct sample *sample = dive->sample+i;
struct plot_data *entry = pi->entry + i + 2;
sec = entry->sec = sample->time.seconds;
depth = entry->val = sample->depth.mm;
entry->same_cylinder = sample->cylinderindex == cylinderindex;
cylinderindex = sample->cylinderindex;
entry->pressure = sample->cylinderpressure.mbar;
if (!entry->same_cylinder && !entry->pressure)
entry->pressure = dive->cylinder[cylinderindex].start.mbar;
entry->temperature = sample->temperature.mkelvin;
if (depth || lastdepth)
lastindex = i+2;
lastdepth = depth;
if (depth > pi->maxdepth)
pi->maxdepth = depth;
}
if (lastdepth)
lastindex = i + 2;
/* Fill in the last two entries with empty values but valid times */
i = dive->samples + 2;
pi->entry[i].sec = sec + 20;
pi->entry[i+1].sec = sec + 40;
if (cylinderindex >= 0) {
pi->entry[i].pressure = dive->cylinder[cylinderindex].end.mbar;
pi->entry[i].same_cylinder = 1;
}
pi->nr = lastindex+1;
pi->maxtime = pi->entry[lastindex].sec;
pi->endpressure = pi->minpressure = dive->cylinder[0].end.mbar;
pi->maxpressure = dive->cylinder[0].start.mbar;
pi->meandepth = dive->meandepth.mm;
return analyze_plot_info(pi);
}
void plot(struct graphics_context *gc, cairo_rectangle_int_t *drawing_area, struct dive *dive)
{
struct plot_info *pi = create_plot_info(dive);
cairo_translate(gc->cr, drawing_area->x, drawing_area->y);
cairo_set_line_width(gc->cr, 2);
cairo_set_line_cap(gc->cr, CAIRO_LINE_CAP_ROUND);
cairo_set_line_join(gc->cr, CAIRO_LINE_JOIN_ROUND);
/*
* 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 = (drawing_area->width - 2*drawing_area->x);
gc->maxy = (drawing_area->height - 2*drawing_area->y);
/* Temperature profile */
plot_temperature_profile(gc, pi);
/* Cylinder pressure plot */
plot_cylinder_pressure(gc, pi);
/* Depth profile */
plot_depth_profile(gc, pi);
plot_events(gc, pi, dive);
/* Text on top of all graphs.. */
plot_temperature_text(gc, pi);
plot_depth_text(gc, pi);
plot_cylinder_pressure_text(gc, pi);
/* Bounding box last */
gc->leftx = 0; gc->rightx = 1.0;
gc->topy = 0; gc->bottomy = 1.0;
set_source_rgb(gc, 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);
free(pi);
}
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