def __init__(self, gameworld, **kargs):
self.world = gameworld
self.steering = SteeringBehaviour(self)
#self.heading_smoother = Vec2D()
self.smoothed_heading = Vec2D()
self.smoothing_on = False
self.time_elapsed = float(0.0)
self.vehicle_verts = []
# Create the vehicle's shape
self.initialize_buffer()
MovingObject.__init__(self, **kargs)
class Vehicle(MovingObject):
def __init__(self, gameworld, **kargs):
self.world = gameworld
self.steering = SteeringBehaviour(self)
#self.heading_smoother = Vec2D()
self.smoothed_heading = Vec2D()
self.smoothing_on = False
self.time_elapsed = float(0.0)
self.vehicle_verts = []
# Create the vehicle's shape
self.initialize_buffer()
MovingObject.__init__(self, **kargs)
def update(self, dt):
self.time_elapsed = dt
# Keep a record of its old position so we can update its cell later
# in this method
oldPos = self.pos
# Calculate the combined force from each steering behavior in the
# vehicle's list
steeringForce = self.steering.calculate()
# acceleration = force / mass
acceleration = steeringForce / self.mass
# Update velocity
self.vel += acceleration * dt
# Make sure the vehicle doesn't exceed the max velocity
self.vel.truncate(self.maxSpeed)
# Update the position
self.pos += self.vel * dt
# Update the heading if the vehicle has a non zero velocity
if self.vel.length_sqrd() > 0.00000001:
self.heading = self.vel.normalized_vec()
self.side = self.heading.perp()
# Treat the screen as a toroid
wrap_around(self.pos, self.world.width, self.world.height)
# update the vehicle's current cell if space partitioning is turned on
'''if (Steering()->isSpacePartitioningOn())
{
World()->CellSpace()->UpdateEntity(this, OldPos);
}
if self.smoothing_on:
self.smoothed_heading = m_pHeadingSmoother->Update(Heading());
'''
def draw(self):
# Holds the transformed vertices
transVerts = []
if self.smoothing_on:
transVerts = world_transform(self.vehicle_verts, self.pos, self.smoothed_heading, self.smoothed_heading.perp(), self.scale)
else:
transVerts = world_transform(self.vehicle_verts, self.pos, self.heading, self.side, self.scale)
points = [v.tup() for v in transVerts]
pygame.draw.polygon(self.world.screen, self.color, points, 2)
def initialize_buffer(self):
"""
Fills the vehicle's shape buffer with its vertices
"""
verts = [Vec2D(-1.0, 0.7),
Vec2D(1.0, 0.0),
Vec2D(-1.0, -0.7)]
# Setup the vertex buffer
for v in verts:
self.vehicle_verts.append(v)