X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=profile.c;h=20317b93717704e922000528cf1b5060df1d7bd1;hb=682135838ff313594c7f67fabd9be8f88a33883b;hp=7a0a20828f07c433ed3625bc54bcd8def420619e;hpb=b176daf6d6d169bfa9b811687bd7696b1bb6063f;p=ext%2Fsubsurface.git

diff --git a/profile.c b/profile.c
index 7a0a208..20317b9 100644
--- a/profile.c
+++ b/profile.c
@@ -1,12 +1,86 @@
+/* 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 mintemp, maxtemp;
+	struct plot_data {
+		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)
+{
+	if (gc->printer) {
+		/* Black is white and white is black */
+		double sum = r+g+b;
+		if (sum > 2)
+			r = g = b = 0;
+		else if (sum < 1)
+			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))
 
 /*
@@ -14,198 +88,660 @@ int selected_dive = 0;
  * 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 round_seconds_up(int seconds)
+static int get_maxtime(struct plot_info *pi)
 {
-	return MAX(30*60, ROUND_UP(seconds, 60*10));
+	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 round_feet_up(int feet)
+static int get_maxdepth(struct plot_info *pi)
 {
-	return MAX(90, ROUND_UP(feet+5, 15));
+	unsigned mm = pi->maxdepth;
+	/* Minimum 30m, rounded up to 10m, with at least 3m to spare */
+	return MAX(30000, ROUND_UP(mm+3000, 10000));
 }
 
-/* Scale to 0,0 -> maxx,maxy */
-#define SCALE(x,y) (x)*maxx/scalex+topx,(y)*maxy/scaley+topy
+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_profile(struct dive *dive, cairo_t *cr,
-	double topx, double topy, double maxx, double maxy)
+static void render_depth_sample(struct graphics_context *gc, struct plot_data *entry, const text_render_options_t *tro)
+{
+	int sec = entry->sec;
+	depth_t depth = { entry->val };
+	const char *fmt;
+	double d;
+
+	switch (output_units.length) {
+	case METERS:
+		d = depth.mm / 1000.0;
+		fmt = "%.1f";
+		break;
+	case FEET:
+		d = to_feet(depth);
+		fmt = "%.0f";
+		break;
+	}
+	plot_text(gc, tro, sec, depth.mm, fmt, 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)
 {
-	double scalex, scaley;
-	int begins, sec, depth;
-	int i, samples;
-	struct sample *sample;
 	int maxtime, maxdepth;
 
-	samples = dive->samples;
-	if (!samples)
+	/* 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;
+
+	cairo_set_source_rgba(gc->cr, 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;
+
+	cairo_set_source_rgba(gc->cr, 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);
+}
 
-	cairo_set_line_width(cr, 2);
+static void plot_depth_profile(struct graphics_context *gc, struct plot_info *pi)
+{
+	int i;
+	cairo_t *cr = gc->cr;
+	int ends, sec, depth;
+	int *secs;
+	int *depths;
+	struct plot_data *entry;
+	int maxtime, maxdepth, marker;
 
 	/* Get plot scaling limits */
-	maxtime = round_seconds_up(dive->duration.seconds);
-	maxdepth = round_feet_up(to_feet(dive->maxdepth));
+	maxtime = get_maxtime(pi);
+	maxdepth = get_maxdepth(pi);
 
 	/* Time markers: every 5 min */
-	scalex = maxtime;
-	scaley = 1.0;
+	gc->leftx = 0; gc->rightx = maxtime;
+	gc->topy = 0; gc->bottomy = 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*/
+	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 */
 	}
 
-	/* 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));
+	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 */
-	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)));
+	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);
 
-	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));
+	gc->leftx = 0; gc->rightx = maxtime;
+
+	plot_smoothed_profile(gc, pi);
+	plot_minmax_profile(gc, pi);
+
+	entry = pi->entry;
+	set_source_rgba(gc, 1, 0.2, 0.2, 0.80);
+	secs = (int *) malloc(sizeof(int) * pi->nr);
+	depths = (int *) malloc(sizeof(int) * pi->nr);
+	secs[0] = entry->sec;
+	depths[0] = entry->val;
+	for (i = 1; i < pi->nr; i++) {
+		entry++;
+		sec = entry->sec;
+		if (sec <= maxtime || entry->val > 0) {
+			/* 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, secs[i-1], depths[i-1]);
+			line_to(gc, sec, depth);
+			cairo_stroke(cr);
+			ends = i;
+		}
+		secs[i] = sec;
+		depths[i] = depth;
+	}
+	move_to(gc, secs[ends], depths[ends]);
+	gc->topy = 0; gc->bottomy = 1.0;
+	line_to(gc, secs[ends], 0);
+	line_to(gc, secs[0], 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);
+	set_source_rgba(gc, 1, 0.2, 0.2, 0.80);
 	cairo_stroke(cr);
+	/* now do it again for the neat fill */
+	gc->topy = 0; gc->bottomy = maxdepth;
+	set_source_rgba(gc, 1, 0.2, 0.2, 0.20);
+	move_to(gc, secs[0], depths[0]);
+	for (i = 1; i <= ends; i++) {
+		line_to(gc, secs[i],depths[i]);
+	}
+	gc->topy = 0; gc->bottomy = 1.0;
+	line_to(gc, secs[ends], 0);
+	line_to(gc, secs[0], 0);
+	cairo_close_path(gc->cr);
+	cairo_fill(gc->cr);
 }
 
-static int get_cylinder_pressure_range(struct dive *dive, double *scalex, double *scaley)
+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 = "F";
+	} else {
+		deg = to_C(temperature);
+		unit = "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;
-	double min, max;
+	int last = 0, sec = 0;
+	int last_temperature = 0, last_printed_temp = 0;
 
-	*scalex = round_seconds_up(dive->duration.seconds);
+	if (!setup_temperature_limits(gc, pi))
+		return;
 
-	max = 0;
-	min = 5000;
-	for (i = 0; i < dive->samples; i++) {
-		struct sample *sample = dive->sample + i;
-		double bar;
+	for (i = 0; i < pi->nr; i++) {
+		struct plot_data *entry = pi->entry+i;
+		int mkelvin = entry->temperature;
 
-		if (!sample->cylinderpressure.mbar)
+		if (!mkelvin)
+			continue;
+		last_temperature = mkelvin;
+		sec = entry->sec;
+		if (sec < last + 300)
 			continue;
-		bar = sample->cylinderpressure.mbar;
-		if (bar < min)
-			min = bar;
-		if (bar > max)
-			max = bar;
+		last = sec;
+		plot_single_temp_text(gc,sec,mkelvin);
+		last_printed_temp = mkelvin;
 	}
-	if (!max)
-		return 0;
-	*scaley = max * 1.5;
-	return 1;
+	/* 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_cylinder_pressure(struct dive *dive, cairo_t *cr,
-	double topx, double topy, double maxx, double maxy)
+static void plot_temperature_profile(struct graphics_context *gc, struct plot_info *pi)
 {
 	int i;
-	double scalex, scaley;
+	cairo_t *cr = gc->cr;
+	int last = 0;
 
-	if (!get_cylinder_pressure_range(dive, &scalex, &scaley))
+	if (!setup_temperature_limits(gc, pi))
 		return;
 
-	cairo_set_source_rgba(cr, 0.2, 1.0, 0.2, 0.80);
+	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);
+}
 
-	cairo_move_to(cr, SCALE(0, dive->beginning_pressure.mbar));
-	for (i = 1; i < dive->samples; i++) {
-		int sec, mbar;
-		struct sample *sample = dive->sample + i;
+/* 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);
 
-		sec = sample->time.seconds;
-		mbar = sample->cylinderpressure.mbar;
+	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;
+
+	if (!get_cylinder_pressure_range(gc, pi))
+		return;
+
+	cairo_set_source_rgba(gc->cr, 0.2, 1.0, 0.2, 0.80);
+
+	move_to(gc, 0, pi->maxpressure);
+	for (i = 1; i < pi->nr; i++) {
+		int mbar;
+		struct plot_data *entry = pi->entry + i;
+
+		mbar = entry->pressure;
 		if (!mbar)
 			continue;
-		cairo_line_to(cr, SCALE(sec, mbar));
+		line_to(gc, entry->sec, mbar);
 	}
-	cairo_line_to(cr, SCALE(dive->duration.seconds, dive->end_pressure.mbar));
-	cairo_stroke(cr);
+	line_to(gc, pi->maxtime, pi->minpressure);
+	cairo_stroke(gc->cr);
 }
 
-static void plot(cairo_t *cr, int w, int h, struct dive *dive)
+static int mbar_to_PSI(int mbar)
 {
-	double topx, topy, maxx, maxy;
-	double scalex, scaley;
+	pressure_t p = {mbar};
+	return to_PSI(p);
+}
 
-	topx = w / 20.0;
-	topy = h / 20.0;
-	maxx = (w - 2*topx);
-	maxy = (h - 2*topy);
+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->minpressure * 100;
+			unit = "pascal";
+			break;
+		case BAR:
+			start = (pi->maxpressure + 500) / 1000;
+			end = (pi->minpressure + 500) / 1000;
+			unit = "bar";
+			break;
+		case PSI:
+			start = mbar_to_PSI(pi->maxpressure);
+			end = mbar_to_PSI(pi->minpressure);
+			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->minpressure,
+			  "%d %s", end, unit);
+	}
+}
 
-	/* Depth profile */
-	plot_profile(dive, cr, topx, topy, maxx, maxy);
+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--;
+	}
 
-	/* Cylinder pressure plot? */
-	plot_cylinder_pressure(dive, cr, topx, topy, maxx, maxy);
+	/* 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;
+}
 
-	/* 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 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-1; 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 < 30 && entry->velocity < FAST) { 
+				int past = -2;
+				while (pi->entry <= entry-past && entry[0].sec - entry[past].sec < 30)
+					past--;
+				entry->velocity = velocity((entry[0].val - entry[past].val) / 
+							(entry[0].sec - entry[past].sec));
+			}
+		} else
+			entry->velocity = STABLE;
+	}
 
-static gboolean expose_event(GtkWidget *widget, GdkEventExpose *event, gpointer data)
+	/* 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)
 {
-	struct dive *dive = current_dive;
-	cairo_t *cr;
-	int w,h;
+	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->pressure = sample->cylinderpressure.mbar;
+		entry->temperature = sample->temperature.mkelvin;
 
-	w = widget->allocation.width;
-	h = widget->allocation.height;
+		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;
 
-	cr = gdk_cairo_create(widget->window);
-	cairo_set_source_rgb(cr, 0, 0, 0);
-	cairo_paint(cr);
+	pi->nr = lastindex+1;
+	pi->maxtime = pi->entry[lastindex].sec;
 
-	if (dive)
-		plot(cr, w, h, dive);
+	pi->minpressure = dive->cylinder[0].end.mbar;
+	pi->maxpressure = dive->cylinder[0].start.mbar;
 
-	cairo_destroy(cr);
+	pi->meandepth = dive->meandepth.mm;
 
-	return FALSE;
+	return analyze_plot_info(pi);
 }
 
-GtkWidget *dive_profile_frame(void)
+void plot(struct graphics_context *gc, int w, int h, struct dive *dive)
 {
-	GtkWidget *frame;
-	GtkWidget *da;
+	double topx, topy;
+	struct plot_info *pi = create_plot_info(dive);
+
+	topx = w / 20.0;
+	topy = h / 20.0;
+	cairo_translate(gc->cr, topx, topy);
+	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 = (w - 2*topx);
+	gc->maxy = (h - 2*topy);
+
+	/* Temperature profile */
+	plot_temperature_profile(gc, pi);
+
+	/* Cylinder pressure plot */
+	plot_cylinder_pressure(gc, pi);
+
+	/* Depth profile */
+	plot_depth_profile(gc, pi);
+
+	/* 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;
 
-	frame = gtk_frame_new("Dive profile");
-	gtk_widget_show(frame);
-	da = gtk_drawing_area_new();
-	gtk_widget_set_size_request(da, 450, 350);
-	g_signal_connect(da, "expose_event", G_CALLBACK(expose_event), NULL);
-	gtk_container_add(GTK_CONTAINER(frame), da);
+	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);
 
-	return frame;
 }