--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/engine/python/fife/extensions/fife_math.py	Fri May 07 21:07:27 2010 +0000
@@ -0,0 +1,161 @@
+# -*- coding: utf-8 -*-
+
+# ####################################################################
+#  Copyright (C) 2005-2010 by the FIFE team
+#  http://www.fifengine.net
+#  This file is part of FIFE.
+#
+#  FIFE is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU Lesser General Public
+#  License as published by the Free Software Foundation; either
+#  version 2.1 of the License, or (at your option) any later version.
+#
+#  This library is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+#  Lesser General Public License for more details.
+#
+#  You should have received a copy of the GNU Lesser General Public
+#  License along with this library; if not, write to the
+#  Free Software Foundation, Inc.,
+#  51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+# ####################################################################
+
+from fife import fife
+import math
+
+"""
+Math Library
+==================================
+
+This is a collection of useful 2D math functions/classes.
+"""
+
+
+def normalize(vector):
+	"""
+	Helper function to normalize a 2D vector
+	
+	@param vector a L{fife.DoublePoint} to be normalized
+	
+	@return A normalized L{fife.DoublePoint}
+	"""
+	norm = fife.DoublePoint(0,0) 
+		
+	invLength = 1.0/vector.length()
+	if invLength > 1e-06:
+		norm.x = vector.x * invLength;
+		norm.y = vector.y * invLength;
+	else:
+		norm.x = 0
+		norm.y = 0
+	
+	return norm
+	
+class Rect(object):
+	"""
+	Rect
+	
+	A class used to specify the bounding box of objects.  For use
+	with collision detection.  This was written in python because
+	FIFE does not provide a Rect class that can use floating point
+	values.
+	"""
+	def __init__(self, x = 0, y = 0, w = 0, h = 0):
+		"""
+		@param x The x coordinate
+		@param y The y coordinate
+		@param w The width
+		@param h The height
+		"""
+		self._x = x
+		self._y = y
+		self._w = w
+		self._h = h
+		
+	def intersects(self, rect):
+		"""
+		Tests for intersection of rect.
+		
+		@param rect the Rect to perform the test against
+		@return True if the rectancles intersect, False if not.
+		"""
+		_x = self._x - rect.x;
+		_y = self._y - rect.y;
+		_w = self._w;
+		_h = self._h;
+
+		if _x < 0:
+			_w += _x
+			_x = 0
+
+		if _y < 0:
+			_h += _y
+			_y = 0
+
+		if _x + _w > rect.w:
+			_w = rect.w - _x
+
+		if _y + _h > rect.h:
+			_h = rect.h - _y
+			
+		if _w <= 0 or _h <= 0:
+			return False
+
+		return True
+
+	def _setX(self, x):
+		self._x = x
+		
+	def _getX(self):
+		return self._x
+
+	def _setY(self, y):
+		self._y = y
+		
+	def _getY(self):
+		return self._y
+		
+	def _setW(self, w):
+		self._w = w
+		
+	def _getW(self):
+		return self._w
+		
+	def _setH(self, h):
+		self._h = h
+		
+	def _getH(self):
+		return self._h
+		
+	x = property(_getX, _setX)
+	y = property(_getY, _setY)
+	w = property(_getW, _setW)
+	h = property(_getH, _setH)
+	
+def rotatePoint(origin, point, angle):
+	"""
+	Rotates a point around the specified origin.
+	
+	@param origin A L{fife.DoublePoint} specifying the origin.
+	@param point A L{fife.DoublePoint} to be rotated.
+	@param angle The angle in which to rotate the point.
+	
+	@return A L{fife.DoublePoint} representing the rotated point.
+	"""
+	newp = fife.DoublePoint(0,0)
+	
+	theta = (angle * math.pi)/180
+	
+	costheta = math.cos(theta)
+	sintheta = math.sin(theta)
+	
+	x = point.x - origin.x
+	y = point.y - origin.y
+	
+	newp.x = costheta * x - sintheta * y
+	newp.y = sintheta * x + costheta * y
+	
+	return newp
+
+__all__ = ['normalize','Rect','rotatePoint']