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import pygame
class Bridge:
def __init__(self, game):
self.game = game
self.screen = game.screen
self.world = game.world
self.cost = 0
self.stress = 0
self.capacity = 1
self.first_train = None
self.train_off_screen = False
self.train_was_created = False
self.level_completed = False
self.sounds = {"wooo":loadSound("sounds/wooo.wav"),
"death":loadSound("sounds/death.wav"),
"startup":loadSound("sounds/startup.wav")}
def restart(self):
self.world.run_physics = False
self.train_off_screen = False
self.level_completed = False
self.train_was_created = False
def create_world(self):
self.world.set_color((100, 150, 50))
rect = pygame.Rect((-400, 825), (750, -250))
rect.normalize()
pygame.draw.rect(self.screen, (100, 180, 255), rect, 3)
self.world.add.rect(rect.center, rect.width / 2, rect.height / 2,
dynamic=False)
rect = pygame.Rect((1600, 825), (-750, -250))
rect.normalize()
pygame.draw.rect(self.screen, (100, 180, 255), rect, 3)
self.world.add.rect(rect.center, rect.width / 2, rect.height / 2,
dynamic=False)
self.world.reset_color()
def add_cost(self, value):
self.cost = self.cost + value
print "cost now", value
def joint_added(self, joint):
print "joint added!"
self.add_cost(100)
self.capacity += 500
def joint_deleted(self, joint):
print "joint deleting!"
self.add_cost(-100)
self.capacity -= 500
def box_added(self):
self.add_cost(10)
def box_deleted(self):
self.add_cost(-10)
def for_each_frame(self):
self.stress = 0
joint = self.world.world.GetJointList()
for j in joint:
try:
if j.IsMotorEnabled() == False:
force = j.GetReactionForce(30).Length()
self.stress += force
if force > 500:
print "destroy joint!"
self.world.world.DestroyJoint(j)
self.capacity -= 500
else:
vec = j.GetAnchor1()
coord = int(self.world.meter_to_screen(vec.x)), \
int(self.screen.get_height() -
self.world.meter_to_screen(vec.y))
pygame.draw.circle(self.screen,
(int(force / 2), 255 - int(force / 2), 0),
coord, 6)
except AttributeError:
pass
pos = self.first_train.GetPosition()
if pos.x > 14.0:
if not self.level_completed:
self.level_completed = True
self.sounds['wooo'].play()
elif pos.y < 0.0:
if not self.train_off_screen:
self.sounds['death'].play()
print "TRAIN FELL OFF!", pos.x
self.train_off_screen = True
def create_train(self, worldpoint = (-100, 490),
train = (100, 50),
wheelrad = 20,
cars = 3,
force = False):
if not force and self.train_was_created:
return
self.sounds['startup'].play()
self.train_was_created = True
points = []
self.train_off_screen = False
for i in range(0, cars):
startpoint = (worldpoint[0] - (train[0] + 7) * i, worldpoint[1])
points.append(startpoint)
rect = pygame.Rect(startpoint, train)
rect.normalize()
pygame.draw.rect(self.screen, (200, 50, 100), rect, 3)
rect = self.world.add.rect(rect.center, rect.width / 2,
rect.height / 2, dynamic = True,
density=10.0, restitution=0.16,
friction=0.5)
if i == 0:
self.first_train = rect
self.world.set_color((0, 0, 0))
rearwheel = (startpoint[0] + wheelrad,startpoint[1] +
train[1] - wheelrad / 2)
pygame.draw.circle(self.screen, (0, 0, 0), rearwheel, wheelrad, 3)
self.world.add.ball(rearwheel, wheelrad, dynamic=True, density=10.0,
restitution=0.16, friction=0.5)
frontwheel = (startpoint[0] + train[0] - wheelrad, startpoint[1] +
train[1] - wheelrad / 2)
pygame.draw.circle(self.screen, (0, 0, 0), frontwheel, wheelrad, 3)
self.world.add.ball(frontwheel, wheelrad, dynamic=True, density=10.0,
restitution=0.16, friction=0.5)
self.world.reset_color()
rearaxle = self.world.get_bodies_at_pos(rearwheel)
frontaxle = self.world.get_bodies_at_pos(frontwheel)
if len(rearaxle) == 2:
self.world.add.jointMotor(rearaxle[0], rearaxle[1], rearwheel)
if len(frontaxle) == 2:
self.world.add.jointMotor(frontaxle[0], frontaxle[1], frontwheel)
for i in range(1, len(points)):
backlink = (points[i][0] + train[0] - 1, points[i][1] + train[1] - 1)
frontlink = (points[i - 1][0] + 1, points[i - 1][1] + train[1] - 1)
btrain = self.world.get_bodies_at_pos(backlink)
ftrain = self.world.get_bodies_at_pos(frontlink)
if len(ftrain) and len(btrain):
self.world.add.distanceJoint(btrain[0], ftrain[0], backlink, frontlink)
# function for loading sounds (mostly borrowed from Pete Shinners pygame tutorial)
def loadSound(name):
# if the mixer didn't load, then create an empy class that has an empty play method
# this way the program will run if the mixer isn't present (sans sound)
class NoneSound:
def play(self): pass
def set_volume(self): pass
if not pygame.mixer:
return NoneSound()
try:
sound = pygame.mixer.Sound(name)
except:
print "error with sound: " + name
return NoneSound()
return sound
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