1 files changed, 38 insertions, 20 deletions

diff --git a/lhist_scr.c b/lhist_scr.c
index c09e48e..e93359f 100644
--- a/lhist_scr.c
+++ b/lhist_scr.c
@@ -19,8 +19,6 @@
  */
 #include "iw_if.h"
 
-/* CONSTANTS */
-
 /* Number of lines in the key window at the bottom */
 #define KEY_WIN_HEIGHT	3
 
@@ -34,6 +32,9 @@
  */
 #define HIST_MAXYLEN	(HIST_WIN_HEIGHT - 1)
 
+/* Position (relative to right border) and maximum length of dBm level tags. */
+#define LEVEL_TAG_POS	5
+
 /* GLOBALS */
 static WINDOW *w_lhist, *w_key;
 
@@ -160,6 +161,11 @@ static double hist_level(double val, int min, int max)
 	return map_range(val, min, max, 1, HIST_MAXYLEN);
 }
 
+static double hist_level_inverse(int y_level, int min, int max)
+{
+	return map_range(y_level, 1, HIST_MAXYLEN, min, max);
+}
+
 /* Order needs to be reversed as y-coordinates grow downwards */
 static int hist_y(int yval)
 {
@@ -239,6 +245,24 @@ static void display_lhist(void)
 			noise_level = hist_level(iwl.noise, conf.noise_min, conf.noise_max);
 			plot_colour = noise_level > snr_level ? CP_STATNOISE : CP_STATNOISE_S;
 			hist_plot(noise_level, x, plot_colour);
+
+		} else if (x == LEVEL_TAG_POS && ! (iwl.flags & IW_QUAL_LEVEL_INVALID)) {
+			char	tmp[LEVEL_TAG_POS + 1];
+			int	len;
+			/*
+			 * Tag the horizontal grid lines with dBm levels.
+			 * This is only supported for signal levels, when the screen is not
+			 * shared by several graphs (each having a different scale).
+			 */
+			wattrset(w_lhist, COLOR_PAIR(CP_STATSIG));
+			for (y = 1; y <= HIST_MAXYLEN; y++) {
+				if (y != 1 && (y % 5) && y != HIST_MAXYLEN)
+					continue;
+				len = snprintf(tmp, sizeof(tmp), "%.0f",
+					       hist_level_inverse(y, conf.sig_min,
+								     conf.sig_max));
+				mvwaddstr(w_lhist, hist_y(y), hist_x(len), tmp);
+			}
 		}
 
 		if (! (iwl.flags & IW_QUAL_LEVEL_INVALID)) {
@@ -280,10 +304,11 @@ static void display_key(WINDOW *w_key)
 	wrefresh(w_key);
 }
 
-static void redraw_lhist(void)
+static void redraw_lhist(int signum)
 {
 	static int vcount = 1;
 
+	sampling_do_poll();
 	if (!--vcount) {
 		vcount = conf.slotsize;
 		display_lhist();
@@ -291,34 +316,27 @@ static void redraw_lhist(void)
 	}
 }
 
-enum wavemon_screen scr_lhist(WINDOW *w_menu)
+void scr_lhist_init(void)
 {
-	int key = 0;
-
 	w_lhist = newwin_title(0, HIST_WIN_HEIGHT, "Level histogram", true);
 	w_key   = newwin_title(HIST_MAXYLEN + 1, KEY_WIN_HEIGHT, "Key", false);
 
 	init_extrema(&e_signal);
 	init_extrema(&e_noise);
 	init_extrema(&e_snr);
+	sampling_init(redraw_lhist);
 
 	display_key(w_key);
+}
 
-	iw_stat_redraw = redraw_lhist;
-	while (key < KEY_F(1) || key > KEY_F(10)) {
-		while ((key = wgetch(w_menu)) <= 0)
-			usleep(5000);
-
-		/* Keyboard shortcuts */
-		if (key == 'q')
-			key = KEY_F(10);
-		else if (key == 'i')
-			key = KEY_F(1);
-	}
-	iw_stat_redraw = NULL;
+int scr_lhist_loop(WINDOW *w_menu)
+{
+	return wgetch(w_menu);
+}
 
+void scr_lhist_fini(void)
+{
+	sampling_stop();
 	delwin(w_lhist);
 	delwin(w_key);
-
-	return key - KEY_F(1);
 }