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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 RaycastTest (Framework):
name="RaycastTest"
laserBody=None
_pickle_vars=['laserBody']
def __init__(self):
super(RaycastTest, self).__init__()
#self.world.SetGravity( (0,0) )
bd=box2d.b2BodyDef()
bd.position = (0.0, -10.0)
ground = self.world.CreateBody(bd)
sd=box2d.b2PolygonDef()
sd.SetAsBox(50.0, 10.0)
ground.CreateShape(sd)
bd=box2d.b2BodyDef()
bd.position = (0.0, 1.0)
self.laserBody = self.world.CreateBody(bd)
sd=box2d.b2PolygonDef()
sd.SetAsBox(5.0, 1.0)
sd.density = 4.0
self.laserBody.CreateShape(sd)
self.laserBody.SetMassFromShapes()
#Create a few shapes
bd.position = (-5.0, 10.0)
body = self.world.CreateBody(bd)
cd=box2d.b2CircleDef()
cd.radius = 3
body.CreateShape(cd)
bd.position = (5.0, 10.0)
body = self.world.CreateBody(bd)
body.CreateShape(cd)
def Keyboard(self, key):
pass
def Step(self, settings):
super(RaycastTest, self).Step(settings)
if not self.laserBody:
return
segmentLength = 30.0
segment=box2d.b2Segment()
laserStart=(5.0-0.1,0.0)
laserDir=(segmentLength,0.0)
segment.p1 = self.laserBody.GetWorldPoint(laserStart)
segment.p2 = self.laserBody.GetWorldVector(laserDir)
segment.p2+=segment.p1
for rebounds in xrange(10):
lambda_, normal, shape = self.world.RaycastOne(segment,False,None)
laserColor=box2d.b2Color(1.0,0,0)
if shape:
self.debugDraw.DrawSegment(segment.p1,(1-lambda_)*segment.p1+lambda_*segment.p2,laserColor)
else:
self.debugDraw.DrawSegment(segment.p1,segment.p2,laserColor)
break
#Bounce
segmentLength *= (1-lambda_)
if segmentLength <= box2d.B2_FLT_EPSILON:
break
laserStart = (1-lambda_)*segment.p1+lambda_*segment.p2
laserDir = segment.p2-segment.p1
laserDir.Normalize()
laserDir = laserDir -2 * box2d.b2Dot(laserDir,normal) * normal
segment.p1 = laserStart-0.1*laserDir
segment.p2 = laserStart+segmentLength*laserDir
if __name__=="__main__":
main(RaycastTest)
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