hamster-applet r769 - in trunk: hamster tests

[tbaugis svn gnome org]

Author: tbaugis
Date: Sat Feb 21 13:18:40 2009
New Revision: 769
URL: http://svn.gnome.org/viewvc/hamster-applet?rev=769&view=rev

Log:
going for a walk and before that in fear to loos anything, 
adding some non-functional code


Modified:
   trunk/hamster/charting.py
   trunk/tests/charting_test.py

Modified: trunk/hamster/charting.py
==============================================================================
--- trunk/hamster/charting.py	(original)
+++ trunk/hamster/charting.py	Sat Feb 21 13:18:40 2009
@@ -79,6 +79,28 @@
     r,g,b = color.red / 65536.0, color.green / 65536.0, color.blue / 65536.0
     context.set_source_rgb(r, g, b)
     
+class Integrator(object):
+    """an iterator, inspired by "visualizing data" book to simplify animation"""
+    def __init__(self, start_value, precision = 0):
+        """precision determines, until which decimal number we go"""
+        self.value = start_value
+        self.target_value = start_value
+        self.precision = precision
+        
+    def target(self, value):
+        """target next value"""
+        self.target_value = value
+        
+    def update(self):
+        """goes from current to target value
+        if there is any action needed. returns false when done"""
+        self.value += (self.target_value - self.value) / 10.0
+        
+        return round(self.value, self.precision) != round(self.target_value,
+                                                          self.precision)
+
+    
+    
 class Chart(gtk.DrawingArea):
     """Chart constructor. Optional arguments:
         orient_vertical = [True|False] - Chart orientation.

Modified: trunk/tests/charting_test.py
==============================================================================
--- trunk/tests/charting_test.py	(original)
+++ trunk/tests/charting_test.py	Sat Feb 21 13:18:40 2009
@@ -6,12 +6,28 @@
 from hamster import charting
 
 class TestIteratorFunctions(unittest.TestCase):
-    def testOneStep(self):
-        integrator = charting.Integrator(0)
+    def test_target_bigger(self):
+        integrator = charting.Integrator(0, 0)
         integrator.target(10)
-        
         integrator.update()
-        assert integrator.value == 9
+        assert integrator.value == 1
+
+    def test_target_lesser(self):
+        integrator = charting.Integrator(0, 0)
+        integrator.target(-10)
+        integrator.update()
+        assert integrator.value == -1
+    
+    def test_reaches_target(self):
+        integrator = charting.Integrator(0, 0)
+        integrator.target(10)
+        
+        while integrator.update():
+            print integrator.value
+        
+        print round(integrator.value, 0)
+        assert round(integrator.value, 0) == 10
+        
 
 if __name__ == '__main__':
     unittest.main()