Print starting and ending pressures

This is very simplistic as far as placement of the text goes.
It makes the plot_text function somewhat more generic.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/profile.c b/profile.c
index f10e856c29fb19e48cb1c757e31f290bf131fe17..f0a4c7030f68f77044996520d40ddf9df02cae2b 100644 (file)
--- a/profile.c
+++ b/profile.c
@@ -27,7 +27,13 @@ static int round_feet_up(int feet)
        return MAX(90, ROUND_UP(feet+5, 15));
 }
 
-static void plot_text(cairo_t *cr, double x, double y, const char *fmt, ...)
+typedef struct {
+    double r,g,b;
+    enum {CENTER,LEFT} allign;
+} text_render_options_t;
+
+static void plot_text(cairo_t *cr, text_render_options_t *tro,
+                     double x, double y, const char *fmt, ...)
 {
        cairo_text_extents_t extents;
        char buffer[80];
@@ -39,7 +45,8 @@ static void plot_text(cairo_t *cr, double x, double y, const char *fmt, ...)
 
        cairo_text_extents(cr, buffer, &extents);
 
-       x -= extents.width/2 + extents.x_bearing;
+       if (tro->allign == CENTER)
+           x -= extents.width/2 + extents.x_bearing;
        y += extents.height * 1.2;
 
        cairo_move_to(cr, x, y);
@@ -48,7 +55,7 @@ static void plot_text(cairo_t *cr, double x, double y, const char *fmt, ...)
        cairo_stroke(cr);
 
        cairo_move_to(cr, x, y);
-       cairo_set_source_rgb(cr, 1, 0, 0);
+       cairo_set_source_rgb(cr, tro->r, tro->g, tro->b);
        cairo_show_text(cr, buffer);
 }
 
@@ -126,11 +133,12 @@ static void plot_depth_text(struct dive *dive, cairo_t *cr,
        cairo_set_source_rgb(cr, 1, 0.2, 0.2);
        i = 0;
        while ((i = next_minmax(dive, i, 1)) != 0) {
+               text_render_options_t tro = {1.0, 0.2, 0.2, CENTER};
                struct sample *sample = dive->sample+i;
                int sec = sample->time.seconds;
                int depth = to_feet(sample->depth);
 
-               plot_text(cr, SCALE(sec, depth), "%d ft", depth);
+               plot_text(cr, &tro, SCALE(sec, depth), "%d ft", depth);
                i = next_minmax(dive, i, 0);
                if (!i)
                        break;
@@ -202,18 +210,23 @@ static void plot_depth_profile(struct dive *dive, cairo_t *cr,
        cairo_stroke(cr);
 }
 
-static int get_cylinder_pressure_range(struct dive *dive, double *scalex, double *scaley)
+/* gets both the actual start and end pressure as well as the scaling factors */
+static int get_cylinder_pressure_range(struct dive *dive, double *scalex, double *scaley,
+                                      double *startp, double *endp)
 {
        int i;
        double min, max;
+       double bar;
 
        *scalex = round_seconds_up(dive->duration.seconds);
 
        max = 0;
        min = 5000;
+       if (startp)
+           *startp = *endp = 0.0;
+
        for (i = 0; i < dive->samples; i++) {
                struct sample *sample = dive->sample + i;
-               double bar;
 
                /* FIXME! We only track cylinder 0 right now */
                if (sample->cylinderindex)
@@ -221,11 +234,15 @@ static int get_cylinder_pressure_range(struct dive *dive, double *scalex, double
                if (!sample->cylinderpressure.mbar)
                        continue;
                bar = sample->cylinderpressure.mbar;
+               if (bar != 0.0 && startp && *startp == 0.0)
+                   *startp = bar;
                if (bar < min)
                        min = bar;
                if (bar > max)
                        max = bar;
        }
+       if (endp)
+           *endp = bar;
        if (!max)
                return 0;
        *scaley = max * 1.5;
@@ -238,7 +255,7 @@ static void plot_cylinder_pressure(struct dive *dive, cairo_t *cr,
        int i, sec = -1;
        double scalex, scaley;
 
-       if (!get_cylinder_pressure_range(dive, &scalex, &scaley))
+       if (!get_cylinder_pressure_range(dive, &scalex, &scaley, NULL, NULL))
                return;
 
        cairo_set_source_rgba(cr, 0.2, 1.0, 0.2, 0.80);
@@ -263,6 +280,24 @@ static void plot_cylinder_pressure(struct dive *dive, cairo_t *cr,
        cairo_stroke(cr);
 }
 
+
+static void plot_cylinder_pressure_text(struct dive *dive, cairo_t *cr,
+       double topx, double topy, double maxx, double maxy)
+{
+       double scalex, scaley;
+       double startp,endp;
+
+       cairo_set_font_size(cr, 10);
+
+       if (get_cylinder_pressure_range(dive, &scalex, &scaley,
+                                       &startp, &endp)) {
+               text_render_options_t tro = {0.2, 1.0, 0.2, LEFT};
+               plot_text(cr, &tro, SCALE(0, startp), "%3.0f bar", startp/1000.0);
+               plot_text(cr, &tro, SCALE(dive->duration.seconds, endp),
+                         "%3.0f bar", endp/1000.0);
+       }
+}
+
 static void plot(cairo_t *cr, int w, int h, struct dive *dive)
 {
        double topx, topy, maxx, maxy;
@@ -281,6 +316,7 @@ static void plot(cairo_t *cr, int w, int h, struct dive *dive)
 
        /* Text on top of all graphs.. */
        plot_depth_text(dive, cr, topx, topy, maxx, maxy);
+       plot_cylinder_pressure_text(dive, cr, topx, topy, maxx, maxy);
 
        /* Bounding box last */
        scalex = scaley = 1.0;