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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 Buoyancy (Framework):
name="Buoyancy"
bc=None
_pickle_vars=['bc']
def __init__(self):
super(Buoyancy, self).__init__()
bcd = box2d.b2BuoyancyControllerDef()
bcd.offset = 15
bcd.normal = (0,1)
bcd.density = 2
bcd.linearDrag = 2
bcd.angularDrag = 1
self.bc = self.world.CreateController(bcd)
sd=box2d.b2PolygonDef()
sd.SetAsBox(50.0, 10.0)
bd=box2d.b2BodyDef()
bd.position = (0.0, -10.0)
ground = self.world.CreateBody(bd)
ground.CreateShape(sd)
sd=box2d.b2PolygonDef()
sd.SetAsBox(0.5, 0.125)
sd.density = 2.0
sd.friction = 0.2
jd=box2d.b2RevoluteJointDef()
numPlanks = 30
prevBody = ground
for i in range(numPlanks):
bd=box2d.b2BodyDef()
bd.position = (-14.5 + 1.0 * i, 5.0)
body = self.world.CreateBody(bd)
body.CreateShape(sd)
body.SetMassFromShapes()
anchor=(-15.0 + 1.0 * i, 5.0)
jd.Initialize(prevBody, body, anchor)
self.world.CreateJoint(jd).getAsType()
prevBody = body
self.bc.AddBody(body)
anchor=(-15.0 + 1.0 * numPlanks, 5.0)
jd.Initialize(prevBody, ground, anchor)
self.world.CreateJoint(jd).getAsType()
for i in range(2):
sd=box2d.b2PolygonDef()
sd.vertexCount = 3
sd.setVertex(0,-0.5, 0.0)
sd.setVertex(1,0.5, 0.0)
sd.setVertex(2,0.0, 1.5)
sd.density = 1.0
bd=box2d.b2BodyDef()
bd.position = (-8.0 + 8.0 * i, 12.0)
body = self.world.CreateBody(bd)
body.CreateShape(sd)
body.SetMassFromShapes()
self.bc.AddBody(body)
for i in range(3):
sd=box2d.b2CircleDef()
sd.radius = 0.5
sd.density = 1.0
bd=box2d.b2BodyDef()
bd.position = (-6.0 + 6.0 * i, 10.0)
body = self.world.CreateBody(bd)
body.CreateShape(sd)
body.SetMassFromShapes()
self.bc.AddBody(body)
def Step(self, settings):
super(Buoyancy, self).Step(settings)
if __name__=="__main__":
main(Buoyancy)
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