def update_shapes(world):
for body in get_bodies(world):
v = body.GetLinearVelocity()
if body.IsSleeping() or v.LengthSquared() < 0.2:
i = body.GetWorldVector(box2d.b2Vec2(box2d.b2Random(-200, 200), box2d.b2Random(-200, 200)))
p = body.GetWorldPoint(box2d.b2Vec2(0.0, 0.0))
body.ApplyImpulse(i, p)
def LaunchBomb(self):
"""
Create a new bomb and launch it at the testbed.
A bomb is a simple circle which has a random position and velocity.
"""
if self.bomb:
self.world.DestroyBody(self.bomb)
self.bomb = None
bd = box2d.b2BodyDef()
bd.allowSleep = True
bd.position.Set(box2d.b2Random(-15.0, 15.0), 30.0)
bd.isBullet = True
self.bomb = self.world.CreateBody(bd)
self.bomb.SetLinearVelocity(-5.0 * bd.position)
sd = box2d.b2CircleDef()
sd.radius = 0.3
sd.density = 20.0
sd.restitution = 0.1
self.bomb.CreateShape(sd)
self.bomb.SetMassFromShapes()
def main():
# gui initialization
screen = pygame.display.set_mode((width, height))
caption = "Python Box2D Testbed Demos"
pygame.display.set_caption(caption)
theme = gui.Theme("default")
app = gui.Desktop(theme=theme)
app.connect(gui.QUIT, app.quit, None)
main = gui.Container(width=width, height=height)
main.add(gui.Label("Box2D Testbed Demos", cls="h1"), 20, 20)
list_size = (width / 2, height / 2)
list_pos = (width / 2 - list_size[0] / 2, height / 2 - list_size[1] / 2)
demolist = gui.List(width=list_size[0], height=list_size[1])
main.add(demolist, list_pos[0], list_pos[1])
add_demos(demolist)
buttonw = list_size[0] / 2 - 20
bottom = list_pos[1] + list_size[1] + 20
b = gui.Button("Run", width=buttonw)
main.add(b, list_pos[0], bottom)
b.connect(gui.CLICK, run_demo, demolist)
b = gui.Button("Quit", width=buttonw)
main.add(b, list_pos[0] + buttonw + 30, bottom)
b.connect(gui.CLICK, lambda x: pygame.event.post(pygame.event.Event(pygame.QUIT)), None)
# box2d initialization
z = 10 # scale
renderer = fwDebugDraw()
renderer.surface = screen
renderer.viewZoom = z
renderer.viewCenter = box2d.b2Vec2(0, 0)
renderer.width, renderer.height = width, height
renderer.viewOffset = renderer.viewCenter - box2d.b2Vec2(width, height) / 2
renderer.SetFlags(box2d.b2DebugDraw.e_shapeBit)
renderer.DrawSolidPolygon = lambda a, b, c: 0
renderer.DrawPolygon = lambda a, b, c: 0
worldAABB = box2d.b2AABB()
worldAABB.lowerBound.Set(-100.0, -100.0)
worldAABB.upperBound.Set(100.0, 100.0)
gravity = box2d.b2Vec2(0.0, -10.0)
world = box2d.b2World(worldAABB, gravity, True)
world.SetDebugDraw(renderer)
bd = box2d.b2BodyDef()
bd.position.Set(0.0, 0.0)
ground = world.CreateBody(bd)
# the borders and the world shapes for the file listing, etc.
sd = box2d.b2PolygonDef()
sd.SetAsBox(1, height / z, box2d.b2Vec2(-width / (2 * z) - 1, 0), 0)
ground.CreateShape(sd)
sd.SetAsBox(1, height / z, box2d.b2Vec2(width / (2 * z) + 1, 0), 0)
ground.CreateShape(sd)
sd.SetAsBox(width / z, 1, box2d.b2Vec2(0, -height / (2 * z) - 1), 0)
ground.CreateShape(sd)
sd.SetAsBox(width / z, 1, box2d.b2Vec2(0, height / (2 * z) + 1), 0)
ground.CreateShape(sd)
sd.SetAsBox(list_size[0] / (2 * z), list_size[1] / (2 * z))
ground.CreateShape(sd)
for i in range(10):
bd = box2d.b2BodyDef()
bd.allowSleep = True
bd.position.Set(
box2d.b2Random(-width / (2 * z), width / (2 * z)), box2d.b2Random(-height / (2 * z), height / (2 * z))
)
bd.isBullet = True
bomb = world.CreateBody(bd)
bomb.SetLinearVelocity(-5.0 * bd.position)
sd = box2d.b2CircleDef()
sd.radius = 1
sd.density = 1.0
sd.restitution = 0.7
bomb.CreateShape(sd)
bomb.SetMassFromShapes()
app.init(main)
main_loop(world, screen, demolist, app)
