Use the analyzed local minima/maxima for depth text plotting

[ext/subsurface.git] / profile.c

diff --git a/profile.c b/profile.c
index 6f4839d24b48bde55d995ec406bd0532e74af912..abd7afe12a4136d960347e3f8b45e62354c52d77 100644 (file)
--- a/profile.c
+++ b/profile.c
@@ -129,10 +129,10 @@ static void plot_text(struct graphics_context *gc, const text_render_options_t *
        cairo_show_text(cr, buffer);
 }
 
-static void render_depth_sample(struct graphics_context *gc, struct sample *sample, const text_render_options_t *tro)
+static void render_depth_sample(struct graphics_context *gc, struct plot_data *entry, const text_render_options_t *tro)
 {
-       int sec = sample->time.seconds;
-       depth_t depth = sample->depth;
+       int sec = entry->sec;
+       depth_t depth = { entry->val };
        const char *fmt;
        double d;
 
@@ -149,76 +149,28 @@ static void render_depth_sample(struct graphics_context *gc, struct sample *samp
        plot_text(gc, tro, sec, depth.mm, fmt, d);
 }
 
-/*
- * Find the next minimum/maximum point.
- *
- * We exit early if we hit "enough" of a depth reversal,
- * which is roughly 10 feet.
- */
-static struct sample *next_minmax(struct sample *sample, struct sample *end, int minmax)
-{
-       const int enough = 3000;
-       struct sample *result;
-       int depthlimit;
-
-       if (sample >= end)
-               return 0;
-
-       depthlimit = sample->depth.mm;
-       result = NULL;
-
-       for (;;) {
-               int depth;
-
-               sample++;
-               if (sample >= end)
-                       return NULL;
-               depth = sample->depth.mm;
-
-               if (minmax) {
-                       if (depth <= depthlimit) {
-                               if (depthlimit - depth > enough)
-                                       break;
-                               continue;
-                       }
-               } else {
-                       if (depth >= depthlimit) {
-                               if (depth - depthlimit > enough)
-                                       break;
-                               continue;
-                       }
-               }
-
-               result = sample;
-               depthlimit = depth;
-       }
-       return result;
-}
-
-static void plot_text_samples(struct graphics_context *gc, struct sample *a, struct sample *b)
+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 (;;) {
-               if (b <= a)
-                       break;
-               a = next_minmax(a, b, 1);
-               if (!a)
-                       break;
-               render_depth_sample(gc, a, &deep);
-               a = next_minmax(a, b, 0);
-               if (!a)
-                       break;
-               if (a->depth.mm < 2500)
+       for (i = 0; i < pi->nr; i++) {
+               struct plot_data *entry = pi->entry + i;
+
+               if (entry->val < 2000)
                        continue;
-               render_depth_sample(gc, a, &shallow);
+
+               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 dive *dive, struct graphics_context *gc)
+static void plot_depth_text(struct dive *dive, struct graphics_context *gc, struct plot_info *pi)
 {
-       struct sample *sample, *end;
        int maxtime, maxdepth;
 
        /* Get plot scaling limits */
@@ -228,10 +180,7 @@ static void plot_depth_text(struct dive *dive, struct graphics_context *gc)
        gc->scalex = maxtime;
        gc->scaley = maxdepth;
 
-       sample = dive->sample;
-       end = dive->sample + dive->samples;
-
-       plot_text_samples(gc, sample, end);
+       plot_text_samples(gc, pi);
 }
 
 static void plot_smoothed_profile(struct graphics_context *gc, struct plot_info *pi)
@@ -625,7 +574,7 @@ static void plot(struct graphics_context *gc, int w, int h, struct dive *dive)
        plot_depth_profile(dive, gc, pi);
 
        /* Text on top of all graphs.. */
-       plot_depth_text(dive, gc);
+       plot_depth_text(dive, gc, pi);
        plot_cylinder_pressure_text(dive, gc);
 
        /* And info box in the lower right corner.. */