def __init__(self):
self.world = self.create_world()
self.added_contacts = []
self.contact_listener = VoidContactListener(self)
self.world.SetContactListener(self.contact_listener)
self.hub = Hub(self.world)
self.ship = Ship(self.world)
class Game(object):
def __init__(self):
self.world = self.create_world()
self.added_contacts = []
self.contact_listener = VoidContactListener(self)
self.world.SetContactListener(self.contact_listener)
self.hub = Hub(self.world)
self.ship = Ship(self.world)
def step(self, dt):
maybe_dead = set()
if random.random() <= dt:
Asteroid(self.world, self.ship)
self.ship.step(dt)
self.step_laser(dt, maybe_dead)
self.world.Step(dt, 10, 8)
for agent_1, agent_2 in self.added_contacts:
maybe_dead.add(agent_1)
maybe_dead.add(agent_2)
agent_1.collide(agent_2)
agent_2.collide(agent_1)
for agent in maybe_dead:
if not agent.alive:
if type(agent) is Asteroid:
agent.split()
self.world.DestroyBody(agent.body)
del self.added_contacts[:]
def step_laser(self, dt, maybe_dead):
if self.ship.firing:
angle = self.ship.body.GetAngle()
unit = box2d.b2Vec2(-math.sin(angle), math.cos(angle))
segment = box2d.b2Segment()
segment.p1 = self.ship.body.GetPosition()
segment.p2 = segment.p1 + unit * 10.0
fraction, normal, shape = self.world.RaycastOne(segment, False, None)
if shape is not None:
agent = shape.GetBody().GetUserData()
if type(agent) is Asteroid:
maybe_dead.add(agent)
agent.power -= self.ship.damage * dt * fraction
def on_draw(self):
glScaled(15.0, 15.0, 15.0)
position = self.ship.body.GetPosition()
glTranslated(-position.x, -position.y, 0.0)
self.draw_lifeline()
self.draw_towline()
self.draw_laser()
for agent in self.query_draw():
agent.draw()
def query_draw(self):
position = self.ship.body.GetPosition()
aabb = box2d.b2AABB()
aabb.lowerBound.Set(position.x - 40.0, position.y - 25.0)
aabb.upperBound.Set(position.x + 40.0, position.y + 25.0)
max_count = 100
(count, shapes) = self.world.Query(aabb, max_count)
agents = set(shape.GetBody().GetUserData() for shape in shapes)
agents = sorted(agents, key=id)
return agents
def draw_lifeline(self):
position = self.ship.body.GetPosition()
distance = math.sqrt(position.x ** 2 + position.y ** 2)
fraction = distance / self.ship.max_lifeline_range
if fraction <= 0.5:
red = fraction * 2.0
green = 1.0
else:
red = 1.0
green = 1.0 - (fraction - 0.5) * 2.0
alpha = 0.5 + 0.5 * fraction
glBegin(GL_LINES)
glColor4d(red, green, 0.0, alpha)
glVertex2d(0.0, 0.0)
glVertex2d(position.x, position.y)
glEnd()
def draw_towline(self):
joint_edge = self.ship.body.GetJointList()
if joint_edge is not None:
joint = joint_edge.joint
anchor_1 = joint.GetAnchor1()
anchor_2 = joint.GetAnchor2()
glBegin(GL_LINES)
glColor3d(1.0, 0.0, 1.0)
glVertex2d(anchor_1.x, anchor_1.y)
glVertex2d(anchor_2.x, anchor_2.y)
glEnd()
def draw_laser(self):
if self.ship.firing:
position = self.ship.body.GetPosition()
angle = self.ship.body.GetAngle()
unit = box2d.b2Vec2(-math.sin(angle), math.cos(angle))
endpoint = position + unit * 10.0
glBegin(GL_LINES)
glColor4d(1.0, 0.0, 0.0, 1.0)
glVertex2d(position.x, position.y)
glColor4d(1.0, 0.0, 0.0, 0.0)
glVertex2d(endpoint.x, endpoint.y)
glEnd()
def create_world(self):
world_aabb = box2d.b2AABB()
world_aabb.lowerBound.Set(-400.0, -400.0)
world_aabb.upperBound.Set(400.0, 400.0)
gravity = box2d.b2Vec2(0.0, 0.0)
return box2d.b2World(world_aabb, gravity, False)
def add_contact(self, point):
agent_1 = point.shape1.GetBody().GetUserData()
agent_2 = point.shape2.GetBody().GetUserData()
self.added_contacts.append((agent_1, agent_2))
def persist_contact(self, point):
pass
def remove_contact(self, point):
pass
def contact_result(self, point):
pass