From 348440bc8e6063a1f221ca2fac4074bd8cabb3be Mon Sep 17 00:00:00 2001
From: Nikos Ntarmos <ntarmos@ceid.upatras.gr>
Date: Mon, 7 Jan 2008 09:28:07 +0100
Subject: [PATCH] autoscale graph widget

FS#26
---
 config.c        |  2 ++
 widgets/graph.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++---
 2 files changed, 55 insertions(+), 3 deletions(-)

diff --git a/config.c b/config.c
index 7bb5fc052..28ac4499e 100644
--- a/config.c
+++ b/config.c
@@ -584,6 +584,8 @@ config_parse(const char *confpatharg)
         CFG_STR((char *) "fg", (char *) NULL, CFGF_NONE),
         CFG_STR((char *) "bg", (char *) NULL, CFGF_NONE),
         CFG_STR((char *) "bordercolor", (char *) NULL, CFGF_NONE),
+        CFG_BOOL((char *) "scale", cfg_false, CFGF_NONE),
+        CFG_FLOAT((char *) "max", 100.0f, CFGF_NONE),
         CFG_END()
     };
     static cfg_opt_t widget_progressbar_bar_opts[] =
diff --git a/widgets/graph.c b/widgets/graph.c
index 16ed9b2bd..a7c26dee0 100644
--- a/widgets/graph.c
+++ b/widgets/graph.c
@@ -41,6 +41,9 @@ typedef struct
     int *lines;             /* keeps the calculated values (line-length); */
     int lines_index;        /* pointer to current val */
     int lines_size;         /* size of lines-array */
+    float *line_values;     /* actual values */
+    int line_max_index;     /* index of the current maximum value */
+    int line_max;           /* maximum value */
 } Data;
 
 
@@ -97,7 +100,9 @@ static void
 graph_tell(Widget *widget, char *command)
 {
     Data *d = widget->data;
-    int percent;
+    int percent, i, height, omax, nmax;
+
+    height = (int) (widget->statusbar->height * d->height + 0.5);
 
     if(!command || d->width < 1)
         return;
@@ -105,9 +110,51 @@ graph_tell(Widget *widget, char *command)
     if(++d->lines_index >= d->lines_size) /* cycle inside the array */
         d->lines_index = 0;
 
+    if (d->line_values && d->line_max_index == d->lines_index &&
+            d->line_values[d->line_max_index]) {
+        omax = d->line_values[d->line_max_index];
+        d->line_values[d->line_max_index] = 0;
+        for (i = 0; i < d->lines_size; i++)
+            if (d->line_values[i] > d->line_values[d->line_max_index]) {
+                d->line_max_index = i;
+            }
+        nmax = MAX(d->line_values[d->line_max_index], d->line_max);
+        if (d->line_values[d->line_max_index]) {
+            for (i = 0; i < d->lines_size; i++) {
+                d->lines[i] = (int) (100*d->line_values[i] / nmax) * (height -
+                        2) / 100 + 0.5;
+            }
+        }
+    }
+
     percent = atoi(command);
-    if(percent <= 100 && percent >= 0)
-        d->percent = percent;
+    if (percent < 0)
+    {
+        if (d->line_values)
+            d->line_values[d->lines_index] = 0;
+        d->percent = 0;
+    }
+    else if (d->line_values)
+    {
+        d->line_values[d->lines_index] = percent;
+        nmax = MAX(d->line_max, d->line_values[d->line_max_index]);
+        if (d->line_values[d->line_max_index] < percent) {
+            // Increase the current max
+            d->line_max_index = d->lines_index;
+            if (d->line_max < d->line_values[d->line_max_index]) {
+                for (i = 0; i < d->lines_size; i++) {
+                    d->lines[i] = (int)
+                        (100*d->line_values[i]/d->line_values[d->line_max_index])
+                        * (height - 2) / 100 + 0.5;
+                }
+            }
+        }
+        d->percent = (int) (100.0 * d->line_values[d->lines_index] / nmax);
+    }
+    else {
+        d->percent = (percent > d->line_max ? 100 :
+                      (int) (100 * ((float)percent) / d->line_max));
+    }
 }
 
 Widget *
@@ -139,6 +186,9 @@ graph_new(Statusbar *statusbar, cfg_t *config)
     }
 
     d->lines = p_new(int, d->lines_size);
+    if (cfg_getbool(config, "scale"))
+        d->line_values = p_new(float, d->lines_size);
+    d->line_max = cfg_getfloat(config, "max");
 
     if((color = cfg_getstr(config, "fg")))
         d->fg = initxcolor(phys_screen, color);