# HG changeset patch
# User Thibaut Girka <thib@sitedethib.com>
# Date 1313997036 -7200
# Node ID c435e83a8e700e76aa904da77784a23c059f11e8
# Parent  7195aaf95f6e49473d20ba00b6482506992458ac
Fix Matrix.rotate_y

diff --git a/pytouhou/utils/matrix.py b/pytouhou/utils/matrix.py
--- a/pytouhou/utils/matrix.py
+++ b/pytouhou/utils/matrix.py
@@ -47,12 +47,11 @@ class Matrix(object):
 
 
     def rotate_y(self, angle):
-        #TODO: check
         d1 = self.data
         cos_a = cos(angle)
         sin_a = sin(angle)
-        d1[0][:], d1[2][:] = ([cos_a * d1[0][i] - sin_a * d1[2][i] for i in range(4)],
-                              [sin_a * d1[0][i] + cos_a * d1[2][i] for i in range(4)])
+        d1[0][:], d1[2][:] = ([cos_a * d1[0][i] + sin_a * d1[2][i] for i in range(4)],
+                              [- sin_a * d1[0][i] + cos_a * d1[2][i] for i in range(4)])
 
 
     def rotate_z(self, angle):