One step to activity chart legend: show maximum values.

diff --git a/pygit/chart.py b/pygit/chart.py
index 855defd..9056317 100644
--- a/pygit/chart.py
+++ b/pygit/chart.py
@@ -17,6 +17,7 @@ class Place(object):
     self.width = width
     self.height = height
     self.scale_set = False
+    self.dg = []

   def set_scale(self,x_ticks,y_max):
     if self.scale_set:
@@ -42,20 +43,19 @@ class Chart(object):
     self.height = height
     self.surf = cairo.ImageSurface(cairo.FORMAT_ARGB32,width,height)
     self.cx = cairo.Context(self.surf)
-    place_height = float(self.height)/n
+    self.place_height = float(self.height)/n
     self.places = []
     self.cx.set_source_rgb(1,1,1)
     self.cx.rectangle(0,0,width,height)
     self.cx.fill()
     for i in range(n):
-      place = Place(self.cx,pl,height-place_height*i-py, width-pl-pr, place_height-2*py)
+      place = Place(self.cx,pl,height-self.place_height*i-py, width-pl-pr, self.place_height-2*py)
       self.places.append(place)

   def set_scale(self,place,ticks_x,max_y):
     self.places[place].set_scale(ticks_x,max_y)
     self.places[place].scale_set = True

-
   def draw(self,lst,color=(0.9,0.2,0.2),place=0):
     pc = self.places[place]
     pc.set_scale(len(lst)-1,max(lst))
@@ -65,6 +65,7 @@ class Chart(object):
     for i in range(len(lst)):
       pc.line_to(i,lst[i])
     pc.cx.stroke()
+    pc.dg.append((color,pc.y_max))

   def labels(self,lst):
     step_x = float(self.width-pl-pr)/(len(lst)-1)
@@ -82,6 +83,21 @@ class Chart(object):
       cur_x += step_x
     cur_x = pl
     self.cx.set_source_rgb(0.2,0.2,0.2)
+    for i in range(len(self.places)):
+      place = self.places[i]
+      if place.scale_set:
+        self.cx.move_to(self.width-pr+5,self.height-(i+1)*self.place_height+py)
+        self.cx.show_text(str(place.y_max))
+      else:
+        cur_y = self.height-(i+1)*self.place_height+py
+        for j in range(len(place.dg)):
+          color,y_max = place.dg[j]
+          self.cx.set_source_rgb(*color)
+          self.cx.move_to(self.width-pr+5,cur_y)
+          self.cx.show_text(str(y_max))
+          cur_y += 15
+
+    self.cx.set_source_rgb(0.2,0.2,0.2)
     for i in range(len(lst)):
       label = lst[i]
       self.cx.move_to(cur_x, int(self.height-py/2))