/* convert velocity to colors */
typedef struct { double r, g, b; } rgb_t;
-static const rgb_t rgb[] = {
+static const rgb_t velocity_color[] = {
[STABLE] = {0.0, 0.4, 0.0},
[SLOW] = {0.4, 0.8, 0.0},
[MODERATE] = {0.8, 0.8, 0.0},
cairo_set_source_rgba(gc->cr, r, g, b, a);
}
+static void set_source_rgb_struct(struct graphics_context *gc, const rgb_t *rgb)
+{
+ set_source_rgba(gc, rgb->r, rgb->g, rgb->b, 1);
+}
+
void set_source_rgb(struct graphics_context *gc, double r, double g, double b)
{
set_source_rgba(gc, r, g, b, 1);
/* 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->depth;
- set_source_rgb(gc, color.r, color.g, color.b);
+ set_source_rgb_struct(gc, &velocity_color[entry->velocity]);
move_to(gc, entry[-1].sec, entry[-1].depth);
line_to(gc, sec, depth);
cairo_stroke(cr);
return pi->maxpressure != 0;
}
-/* set the color for the pressure plot according to temporary sac rate */
-static void set_sac_color(struct graphics_context *gc, double sac)
+#define SAC_COLORS 9
+static const rgb_t sac_color[SAC_COLORS] = {
+ { 0.0, 0.4, 0.2},
+ { 0.2, 0.6, 0.2},
+ { 0.4, 0.8, 0.2},
+ { 0.6, 0.8, 0.2},
+ { 0.8, 0.8, 0.2},
+ { 0.8, 0.6, 0.2},
+ { 0.8, 0.4, 0.2},
+ { 0.9, 0.3, 0.2},
+ { 1.0, 0.2, 0.2},
+};
+
+/* set the color for the pressure plot according to temporary sac rate
+ * as compared to avg_sac; the calculation simply maps the delta between
+ * sac and avg_sac to indexes 0 .. (SAC_COLORS - 1) with everything
+ * more than 6000 ml/min below avg_sac mapped to 0 */
+
+static void set_sac_color(struct graphics_context *gc, int sac, int avg_sac)
{
- if (sac < 9)
- set_source_rgba(gc, 0.0, 0.4, 0.2, 0.80);
- else if (sac < 11)
- set_source_rgba(gc, 0.2, 0.6, 0.2, 0.80);
- else if (sac < 13)
- set_source_rgba(gc, 0.4, 0.8, 0.2, 0.80);
- else if (sac < 15)
- set_source_rgba(gc, 0.6, 0.8, 0.2, 0.80);
- else if (sac < 17)
- set_source_rgba(gc, 0.8, 0.8, 0.2, 0.80);
- else if (sac < 19)
- set_source_rgba(gc, 0.8, 0.6, 0.2, 0.80);
- else if (sac < 21)
- set_source_rgba(gc, 0.8, 0.4, 0.2, 0.80);
- else if (sac < 23)
- set_source_rgba(gc, 0.9, 0.3, 0.2, 0.80);
- else
- set_source_rgba(gc, 1.0, 0.2, 0.2, 0.80);
+ int sac_index = 0;
+ int delta = sac - avg_sac + 6000;
+
+ sac_index = delta / 2000;
+ if (sac_index < 0)
+ sac_index = 0;
+ if (sac_index > SAC_COLORS - 1)
+ sac_index = SAC_COLORS - 1;
+
+ set_source_rgb_struct(gc, &sac_color[sac_index]);
}
-/* calculate the current SAC in l/min */
-#define GET_LOCAL_SAC(_entry1, _entry2, _dive) \
+/* calculate the current SAC in ml/min and convert to int */
+#define GET_LOCAL_SAC(_entry1, _entry2, _dive) (int) \
((GET_PRESSURE((_entry1)) - GET_PRESSURE((_entry2))) * \
(_dive)->cylinder[(_entry1)->cylinderindex].type.size.mliter / \
(((_entry2)->sec - (_entry1)->sec) / 60.0) / \
(1 + ((_entry1)->depth + (_entry2)->depth) / 20000.0) / \
- 1000000.0)
+ 1000.0)
#define SAC_WINDOW 45 /* sliding window in seconds for current SAC calculation */
int last = -1;
int lift_pen = FALSE;
int first_plot = TRUE;
- double sac = 0.0;
+ int sac = 0;
struct plot_data *last_entry = NULL;
if (!get_cylinder_pressure_range(gc, pi))
last++;
last_entry = pi->entry + last;
}
- set_sac_color(gc, sac);
+ set_sac_color(gc, sac, dive->sac);
if (lift_pen) {
if (!first_plot && entry->same_cylinder) {
/* if we have a previous event from the same tank,