Diagram.py: allow changing the font size

diff --git a/Diagram.py b/Diagram.py
index fa35d32..7d6348b 100755 (executable)
--- a/Diagram.py
+++ b/Diagram.py
@@ -23,7 +23,7 @@ from math import *
 
 class Diagram(object):
 
-    def __init__(self, width, height, background=[1, 1, 1]):
+    def __init__(self, width, height, background=[1, 1, 1], font_size=20):
         self.width = width
         self.height = height
         self.background = background
@@ -38,7 +38,7 @@ class Diagram(object):
 
         cr.select_font_face("Georgia", cairo.FONT_SLANT_NORMAL,
                             cairo.FONT_WEIGHT_NORMAL)
-        cr.set_font_size(20)
+        cr.set_font_size(font_size)
 
         # Adjust the font matrix to left-bottom origin
         M = cr.get_font_matrix()