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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# C++ version Copyright (c) 2006-2007 Erin Catto http://www.box2d.org
# Python version by Ken Lauer / sirkne at gmail dot 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 .framework import (Framework, Keys, main)
from Box2D import (b2CircleShape, b2EdgeShape, b2FixtureDef, b2PolygonShape)
class VerticalStack (Framework):
name = "Vertical Stack"
description = ("Tests the stability of stacking circles and boxes\n"
"Press B to launch a horizontal bullet")
bullet = None
def __init__(self):
super(VerticalStack, self).__init__()
columns = 5
rows = 16
ground = self.world.CreateStaticBody(
shapes=[
b2EdgeShape(vertices=[(-40, 0), (40, 0)]),
b2EdgeShape(vertices=[(20, 0), (20, 20)]),
]
)
box = b2FixtureDef(
shape=b2PolygonShape(box=(0.5, 0.5)),
density=1,
friction=0.3)
circle = b2FixtureDef(
shape=b2CircleShape(radius=0.5),
density=1,
friction=0.3)
box_start = -10
box_space = 2.5
circle_start = 8
circle_space = 2.5
for j in range(columns):
for i in range(rows):
self.world.CreateDynamicBody(
fixtures=box,
position=(box_start + box_space * j, 0.752 + 1.54 * i)
)
self.world.CreateDynamicBody(
fixtures=circle,
position=(circle_start + circle_space *
j, 0.752 + 1.54 * i)
)
def Step(self, settings):
super(VerticalStack, self).Step(settings)
def Keyboard(self, key):
if key == Keys.K_b:
if self.bullet:
self.world.DestroyBody(self.bullet)
self.bullet = None
circle = b2FixtureDef(
shape=b2CircleShape(radius=0.25),
density=20,
restitution=0.05)
self.bullet = self.world.CreateDynamicBody(
position=(-31, 5),
bullet=True,
fixtures=circle,
linearVelocity=(400, 0),
)
if __name__ == "__main__":
main(VerticalStack)
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