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annotate src/parpg/bGrease/component/__init__.py @ 192:191f89a22303

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Further work on the scripting system.
author KarstenBock@gmx.net
date Sun, 13 Nov 2011 17:19:14 +0100
parents 0f659c7675f6
children
rev   line source
92
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1 #############################################################################
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2 #
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3 # Copyright (c) 2010 by Casey Duncan and contributors
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4 # All Rights Reserved.
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5 #
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6 # This software is subject to the provisions of the MIT License
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7 # A copy of the license should accompany this distribution.
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8 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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9 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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10 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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11 #
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12 #############################################################################
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13 """Components store all entity data in a given |World|. You can
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14 think of components as tables with entities as their primary keys. Like
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15 database tables, components are defined with a "schema" that specifies
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16 the data fields. Each field in a component has a name and a type.
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17
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18 Component objects themselves have a dict-like interface with entities
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19 as keys and data records as values. An application will typically
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20 interact with components via entity attributes, entity extents or
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21 by joining them. For more information see:
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22
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23 - :class:`~grease.entity.Entity` class.
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24 - :class:`~grease.world.EntityExtent` class.
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25 - :meth:`~grease.world.ComponentParts.join` method of ComponentParts.
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26
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27 See also :ref:`defining custom components in the tutorial <custom-component-example>`.
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28 """
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29
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30 __version__ = '$Id$'
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31
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32 __all__ = ('Component', 'ComponentError', 'Position', 'Transform', 'Movement',
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33 'Shape', 'Renderable', 'Collision')
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34
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35 from parpg.bGrease.component.general import Component
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36 from parpg.bGrease.geometry import Vec2d, Vec2dArray, Rect
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37 from parpg.bGrease import color
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38
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39
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40 class ComponentError(Exception):
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41 """General component error"""
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42
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43
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44 class Position(Component):
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45 """Predefined component that stores position and orientation info for
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46 entities.
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47
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48 Fields:
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49
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50 - **position** (Vec2d) -- Position vector
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51 - **angle** (float) -- Angle, in degrees
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52 """
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53
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54 def __init__(self):
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55 Component.__init__(self, position=Vec2d, angle=float)
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56
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57
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58 class Transform(Component):
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59 """Predefined component that stores offset, shear,
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60 rotation and scale info for entity shapes.
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61
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62 Fields:
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63
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64 - **offset** (Vec2d)
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65 - **shear** (Vec2d)
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66 - **rotation** (float)
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67 - **scale** (float, default 1.0)
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68 """
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69
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70 def __init__(self):
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71 Component.__init__(self, offset=Vec2d, shear=Vec2d, rotation=float, scale=float)
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72 self.fields['scale'].default = lambda: 1.0
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73
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74
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75 class Movement(Component):
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76 """Predefined component that stores velocity,
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77 acceleration and rotation info for entities.
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78
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79 Fields:
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80
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81 - **velocity** (Vec2d) -- Rate of change of entity position
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82 - **accel** (Vec2d) -- Rate of change of entity velocity
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83 - **rotation** (Vec2d) -- Rate of change of entity angle, in degrees/time
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84 """
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85
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86 def __init__(self):
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87 Component.__init__(self, velocity=Vec2d, accel=Vec2d, rotation=float)
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88
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89
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90 class Shape(Component):
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91 """Predefined component that stores shape vertices for entities
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92
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93 - **closed** (bool) -- If the shapes is closed implying an edge between
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94 last and first vertices.
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95 - **verts** (Vec2dArray) -- Array of vertex points
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96 """
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97
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98 def __init__(self):
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99 Component.__init__(self, closed=int, verts=Vec2dArray)
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100 self.fields['closed'].default = lambda: 1
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101
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102
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103 class Renderable(Component):
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104 """Predefined component that identifies entities to be
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105 rendered and provides their depth and color.
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106
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107 - **depth** (float) -- Drawing depth, can be used to determine z-order
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108 while rendering.
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109 - **color** (color.RGBA) -- Color used for entity. The effect of this
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110 field depends on the renderer.
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111 """
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112
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113 def __init__(self):
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114 Component.__init__(self, depth=float, color=color.RGBA)
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115 self.fields['color'].default = lambda: color.RGBA(1,1,1,1)
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116
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117
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118 class Collision(Component):
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119 """Predefined component that stores collision masks to determine
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120 which entities can collide.
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121
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122 Fields:
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123
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124 - **aabb** (Rect) -- The axis-aligned bounding box for the entity.
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125 This is used for broad-phase collision detection.
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126
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127 - **radius** (float) -- The collision radius of the entity, used for narrow-phase
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128 collision detection. The exact meaning of this value depends on the collision
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129 system in use.
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130
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131 - **from_mask** (int) -- A bitmask that determines what entities this object
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132 can collide with.
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133
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134 - **into_mask** (int) -- A bitmask that determines what entities can collide
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135 with this object.
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136
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137 When considering an entity A for collision with entity B, A's ``from_mask`` is
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138 bit ANDed with B's ``into_mask``. If the result is nonzero (meaning 1 or more
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139 bits is set the same for each) then the collision test is made. Otherwise,
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parents: 66
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140 the pair cannot collide.
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141
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142 The default value for both of these masks is ``0xffffffff``, which means that
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parents: 66
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143 all entities will collide with each other by default.
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144 """
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145 def __init__(self):
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146 Component.__init__(self, aabb=Rect, radius=float, from_mask=int, into_mask=int)
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147 self.fields['into_mask'].default = lambda: 0xffffffff
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148 self.fields['from_mask'].default = lambda: 0xffffffff