/usr/share/doc/python-box2d-doc/testbed/test_ApplyForce.py is in python-box2d-doc 2.0.2+svn20100109.244-1.2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 | #!/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 ApplyForce (Framework):
name="ApplyForce"
body=None
_pickle_vars=['body']
def __init__(self):
super(ApplyForce, self).__init__()
self.world.SetGravity((0.0, 0.0))
k_restitution = 0.4
bd=box2d.b2BodyDef()
bd.position = (0.0, 20.0)
ground = self.world.CreateBody(bd)
sd=box2d.b2PolygonDef()
sd.density = 0.0
sd.restitution = k_restitution
sd.SetAsBox(0.2, 20.0, (-20.0, 0.0), 0.0)
ground.CreateShape(sd)
sd.SetAsBox(0.2, 20.0, (20.0, 0.0), 0.0)
ground.CreateShape(sd)
sd.SetAsBox(0.2, 20.0, (0.0, -20.0), 0.5 * box2d.b2_pi)
ground.CreateShape(sd)
sd.SetAsBox(0.2, 20.0, (0.0, 20.0), -0.5 * box2d.b2_pi)
ground.CreateShape(sd)
xf1 = box2d.b2XForm ()
xf1.R.Set(0.3524 * box2d.b2_pi)
xf1.position = box2d.b2Mul(xf1.R, (1.0, 0.0))
sd1=box2d.b2PolygonDef()
sd1.vertexCount = 3
sd1.setVertex(0, box2d.b2Mul(xf1, (-1.0, 0.0)))
sd1.setVertex(1, box2d.b2Mul(xf1, (1.0, 0.0)))
sd1.setVertex(2, box2d.b2Mul(xf1, (0.0, 0.5)))
sd1.density = 2.0
xf2 = box2d.b2XForm ()
xf2.R.Set(-0.3524 * box2d.b2_pi)
xf2.position = box2d.b2Mul(xf2.R, (-1.0, 0.0))
sd2=box2d.b2PolygonDef()
sd2.vertexCount = 3
sd2.setVertex(0, box2d.b2Mul(xf2, (-1.0, 0.0)))
sd2.setVertex(1, box2d.b2Mul(xf2, (1.0, 0.0)))
sd2.setVertex(2, box2d.b2Mul(xf2, (0.0, 0.5)))
sd2.density = 2.0
bd=box2d.b2BodyDef()
bd.angularDamping = 2.0
bd.linearDamping = 0.1
bd.position = (0.0, 1.05)
bd.angle = box2d.b2_pi
self.body = self.world.CreateBody(bd)
self.body.CreateShape(sd1)
self.body.CreateShape(sd2)
self.body.SetMassFromShapes()
def Keyboard(self, key):
if not self.body:
return
if key==K_w:
f = self.body.GetWorldVector((0.0, -200.0))
p = self.body.GetWorldPoint((0.0, 2.0))
self.body.ApplyForce(f, p)
elif key==K_a:
self.body.ApplyTorque(20.0)
elif key==K_d:
self.body.ApplyTorque(-20.0)
if __name__=="__main__":
main(ApplyForce)
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