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#!/usr/bin/python
#
# C++ version Copyright (c) 2006-2007 Erin Catto http://www.gphysics.com
# Python version Copyright (c) 2008 kne / sirkne at gmail dot com
#
# Implemented using the pybox2d SWIG interface for Box2D (pybox2d.googlecode.com)
#
# This software is provided 'as-is', without any express or implied
# warranty. In no event will the authors be held liable for any damages
# arising from the use of this software.
# Permission is granted to anyone to use this software for any purpose,
# including commercial applications, and to alter it and redistribute it
# freely, subject to the following restrictions:
# 1. The origin of this software must not be misrepresented; you must not
# claim that you wrote the original software. If you use this software
# in a product, an acknowledgment in the product documentation would be
# appreciated but is not required.
# 2. Altered source versions must be plainly marked as such, and must not be
# misrepresented as being the original software.
# 3. This notice may not be removed or altered from any source distribution.
from test_main import *
class CollisionFiltering (Framework):
name="CollisionFiltering"
# This is a test of collision filtering.
# There is a triangle, a box, and a circle.
# There are 6 shapes. 3 large and 3 small.
# The 3 small ones always collide.
# The 3 large ones never collide.
# The boxes don't collide with triangles (except if both are small).
k_smallGroup = 1
k_largeGroup = -1
k_defaultCategory = 0x0001
k_triangleCategory = 0x0002
k_boxCategory = 0x0004
k_circleCategory = 0x0008
k_triangleMask = 0xFFFF
k_boxMask = 0xFFFF ^ k_triangleCategory
k_circleMask = 0xFFFF
def __init__(self):
super(CollisionFiltering, self).__init__()
# Ground body
sd=box2d.b2PolygonDef()
sd.SetAsBox(50.0, 10.0)
sd.friction = 0.3
bd=box2d.b2BodyDef()
bd.position = (0.0, -10.0)
ground = self.world.CreateBody(bd)
ground.CreateShape(sd)
# Small triangle
triangleShapeDef=box2d.b2PolygonDef()
triangleShapeDef.vertexCount = 3
triangleShapeDef.setVertex(0,-1.0, 0.0)
triangleShapeDef.setVertex(1,1.0, 0.0)
triangleShapeDef.setVertex(2,0.0, 2.0)
triangleShapeDef.density = 1.0
triangleShapeDef.filter.groupIndex = self.k_smallGroup
triangleShapeDef.filter.categoryBits = self.k_triangleCategory
triangleShapeDef.filter.maskBits = self.k_triangleMask
triangleBodyDef=box2d.b2BodyDef()
triangleBodyDef.position = (-5.0, 2.0)
body1 = self.world.CreateBody(triangleBodyDef)
body1.CreateShape(triangleShapeDef)
body1.SetMassFromShapes()
# Large triangle (recycle definitions)
triangleShapeDef.setVertex(0, 2.0*triangleShapeDef.getVertex(0))
triangleShapeDef.setVertex(1, 2.0*triangleShapeDef.getVertex(1))
triangleShapeDef.setVertex(2, 2.0*triangleShapeDef.getVertex(2))
triangleShapeDef.filter.groupIndex = self.k_largeGroup
triangleBodyDef.position = (-5.0, 6.0)
triangleBodyDef.fixedRotation = True
body2 = self.world.CreateBody(triangleBodyDef)
body2.CreateShape(triangleShapeDef)
body2.SetMassFromShapes()
# Small box
boxShapeDef=box2d.b2PolygonDef()
boxShapeDef.SetAsBox(1.0, 0.5)
boxShapeDef.density = 1.0
boxShapeDef.filter.groupIndex = self.k_smallGroup
boxShapeDef.filter.categoryBits = self.k_boxCategory
boxShapeDef.filter.maskBits = self.k_boxMask
boxBodyDef=box2d.b2BodyDef()
boxBodyDef.position = (0.0, 2.0)
body3 = self.world.CreateBody(boxBodyDef)
body3.CreateShape(boxShapeDef)
body3.SetMassFromShapes()
# Large box (recycle definitions)
boxShapeDef.SetAsBox(2.0, 1.0)
boxShapeDef.filter.groupIndex = self.k_largeGroup
boxBodyDef.position = (0.0, 6.0)
body4 = self.world.CreateBody(boxBodyDef)
body4.CreateShape(boxShapeDef)
body4.SetMassFromShapes()
# Small circle
circleShapeDef=box2d.b2CircleDef()
circleShapeDef.radius = 1.0
circleShapeDef.density = 1.0
circleShapeDef.filter.groupIndex = self.k_smallGroup
circleShapeDef.filter.categoryBits = self.k_circleCategory
circleShapeDef.filter.maskBits = self.k_circleMask
circleBodyDef=box2d.b2BodyDef()
circleBodyDef.position = (5.0, 2.0)
body5 = self.world.CreateBody(circleBodyDef)
body5.CreateShape(circleShapeDef)
body5.SetMassFromShapes()
# Large circle
circleShapeDef.radius *= 2.0
circleShapeDef.filter.groupIndex = self.k_largeGroup
circleBodyDef.position = (5.0, 6.0)
body6 = self.world.CreateBody(circleBodyDef)
body6.CreateShape(circleShapeDef)
body6.SetMassFromShapes()
if __name__=="__main__":
main(CollisionFiltering)
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