+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);
+}
+
+static 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 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)
+{
+ 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;
+
+ 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);
+}
+
+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 = 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 */
+ 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;
+
+ 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);
+ 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 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)