Mercurial > fife-parpg

annotate engine/python/fife/extensions/fife_math.py @ 569:466d76db9701

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Some small code cleanups in the extensions. The SimpleXMLSerializer now makes use of exceptions.
author prock@33b003aa-7bff-0310-803a-e67f0ece8222
date Mon, 28 Jun 2010 19:28:53 +0000
parents ae9f5383f5b1
children c0c3f64bfc2d
rev   line source
492
16ceb3228324 Moved the SoundManager and the 2D math function (helpers) from the shooter demo to the fife extensions.
prock@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
1 # -*- coding: utf-8 -*-
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2
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3 # ####################################################################
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4 # Copyright (C) 2005-2010 by the FIFE team
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5 # http://www.fifengine.net
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6 # This file is part of FIFE.
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7 #
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8 # FIFE is free software; you can redistribute it and/or
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9 # modify it under the terms of the GNU Lesser General Public
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10 # License as published by the Free Software Foundation; either
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11 # version 2.1 of the License, or (at your option) any later version.
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12 #
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13 # This library is distributed in the hope that it will be useful,
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14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16ceb3228324 Moved the SoundManager and the 2D math function (helpers) from the shooter demo to the fife extensions.
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16 # Lesser General Public License for more details.
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17 #
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18 # You should have received a copy of the GNU Lesser General Public
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19 # License along with this library; if not, write to the
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20 # Free Software Foundation, Inc.,
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21 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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22 # ####################################################################
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23
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24 """
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25 Math Library
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26 ==================================
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27
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28 This is a collection of useful 2D math functions/classes.
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29 """
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30
495
ae9f5383f5b1 Added a new log module called Script. This should be used by the python modules.
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31 from fife import fife
ae9f5383f5b1 Added a new log module called Script. This should be used by the python modules.
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32 import math
492
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33
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34 def normalize(vector):
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35 """
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36 Helper function to normalize a 2D vector
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37
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e241d7553496 Fixing the epydoc markup. Did some more commenting.
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38 @param vector: a L{fife.DoublePoint} to be normalized
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39 @type vector: L{fife.DoublePoint}
492
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40
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41 @return: A normalized L{fife.DoublePoint}
492
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42 """
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43 norm = fife.DoublePoint(0,0)
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44
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45 invLength = 1.0/vector.length()
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46 if invLength > 1e-06:
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47 norm.x = vector.x * invLength;
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48 norm.y = vector.y * invLength;
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49 else:
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50 norm.x = 0
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51 norm.y = 0
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52
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53 return norm
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54
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55 class Rect(object):
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56 """
494
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57 A simple rectangle class that allows floating point values.
492
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58
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59 A class used to specify the bounding box of objects. For use
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60 with collision detection. This was written in python because
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61 FIFE does not provide a Rect class that can use floating point
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62 values.
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63 """
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64 def __init__(self, x = 0, y = 0, w = 0, h = 0):
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65 """
494
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66 @param x: The x coordinate
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67 @type x: C{int} or C{float}
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68 @param y: The y coordinate
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69 @type y: C{int} or C{float}
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70 @param w: The width
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71 @type w: C{int} or C{float}
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72 @param h: The height
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73 @type h: C{int} or C{float}
492
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74 """
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75 self._x = x
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76 self._y = y
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77 self._w = w
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78 self._h = h
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79
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80 def intersects(self, rect):
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81 """
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82 Tests for intersection of rect.
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83
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84 @param rect: the L{Rect} to perform the test against.
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85 @type rect: L{Rect}
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86
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87 @return: True if the rectancles intersect, False if not.
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88 @rtype: C{boolean}
492
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89 """
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90 _x = self._x - rect.x;
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91 _y = self._y - rect.y;
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92 _w = self._w;
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93 _h = self._h;
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94
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95 if _x < 0:
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96 _w += _x
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97 _x = 0
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98
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99 if _y < 0:
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100 _h += _y
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101 _y = 0
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102
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103 if _x + _w > rect.w:
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104 _w = rect.w - _x
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105
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106 if _y + _h > rect.h:
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107 _h = rect.h - _y
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108
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109 if _w <= 0 or _h <= 0:
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110 return False
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111
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112 return True
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113
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114 def _setX(self, x):
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115 self._x = x
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116
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117 def _getX(self):
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118 return self._x
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119
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120 def _setY(self, y):
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121 self._y = y
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122
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123 def _getY(self):
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124 return self._y
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125
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126 def _setW(self, w):
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127 self._w = w
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128
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129 def _getW(self):
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130 return self._w
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131
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132 def _setH(self, h):
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133 self._h = h
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134
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135 def _getH(self):
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136 return self._h
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137
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138 x = property(_getX, _setX)
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139 y = property(_getY, _setY)
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140 w = property(_getW, _setW)
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141 h = property(_getH, _setH)
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142
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143 def rotatePoint(origin, point, angle):
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144 """
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
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145 Rotates a point around the specified origin.
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146
495
ae9f5383f5b1 Added a new log module called Script. This should be used by the python modules.
prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 494
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147 @param origin: A point specifying the origin.
494
e241d7553496 Fixing the epydoc markup. Did some more commenting.
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parents: 492
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148 @type origin: L{fife.DoublePoint}
495
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149 @param point: The point to be rotated.
494
e241d7553496 Fixing the epydoc markup. Did some more commenting.
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parents: 492
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150 @type point: L{fife.DoublePoint}
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151 @param angle: The angle in which to rotate the point.
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152 @type angle: C{int} or C{float}
492
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153
495
ae9f5383f5b1 Added a new log module called Script. This should be used by the python modules.
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154 @return: The rotated point.
494
e241d7553496 Fixing the epydoc markup. Did some more commenting.
prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 492
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155 @rtype: L{fife.DoublePoint}
492
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156 """
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157 newp = fife.DoublePoint(0,0)
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158
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159 theta = (angle * math.pi)/180
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160
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diff changeset
161 costheta = math.cos(theta)
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
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162 sintheta = math.sin(theta)
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163
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
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164 x = point.x - origin.x
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165 y = point.y - origin.y
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
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166
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
167 newp.x = costheta * x - sintheta * y
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
168 newp.y = sintheta * x + costheta * y
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diff changeset
169
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
170 return newp
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171
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prock@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
172 __all__ = ['normalize','Rect','rotatePoint']