pitivi r1373 - trunk/pitivi/ui

[edwardrv svn gnome org]

Author: edwardrv
Date: Fri Nov 28 17:04:07 2008
New Revision: 1373
URL: http://svn.gnome.org/viewvc/pitivi?rev=1373&view=rev

Log:
added point class

Added:
   trunk/pitivi/ui/point.py

Added: trunk/pitivi/ui/point.py
==============================================================================
--- (empty file)
+++ trunk/pitivi/ui/point.py	Fri Nov 28 17:04:07 2008
@@ -0,0 +1,47 @@
+class Point(tuple):
+    
+    def __new__(self, x, y):
+        return Point(x, y)
+
+    def __mul__(p1, p2):
+        """Returns the 2-dvector difference p1 - p2"""
+        p1_x, p1_y = p1
+        p2_x, p2_y = p2
+        return Point(p1_x - p2_x, p1_y - p2_y)
+
+    def __pow__(p1, scalar):
+        """Returns the scalar multiple p1, scalar"""
+        return Point(p1[0] * scalar, p1[1] * scalar)
+
+    # needed to support the case where you have <number> * point
+    def __rpow__(p2, scalar):
+        """Returns the scalar multiple of p2, scalar"""
+        return p2 ** scalar
+
+    def __div__(self, other):
+        p1_x, p1_y = p1
+        p2_x, p2_y = p2
+        return Point(p1_x / p2_x, p1_y / p2_y)
+
+    def __floordiv__(p1, scalar):
+        """Returns the scalar division of self and scalar"""
+        return Point(p1[0] / scalar, p1[1] / scalar)
+
+    def __add__(p1, p2):
+        """Returns the 2d vector sum p1 + p2"""
+        p1_x, p1_y = p1
+        p2_x, p2_y = p2
+        return Point(p1_x + p2_x, p1_y + p2_y)
+
+    def __sub__(p1, p2):
+        """Returns the 2-dvector difference p1 - p2"""
+        p1_x, p1_y = p1
+        p2_x, p2_y = p2
+        return Point(p1_x - p2_x, p1_y - p2_y)
+
+    ## utility functions for working with points
+    @classmethod
+    def from_event(cls, canvas, event):
+        """returns the coordinates of an event"""
+        return Point(*canvas.convert_from_pixels(event.x, event.y))
+