Coursera_An Introduction to Interactive Programming in Python_Mini-project # 7 Spaceship

http://www.codeskulptor.org/#user38_mT9p7Gz3Un_9.py

# program for Spaceshipimport simpleguiimport mathimport random# globals for user interfaceWIDTH = 800HEIGHT = 600score = 0lives = 3time = 0.5friction_para = 0.05vol = 7class ImageInfo:    def __init__(self, center, size, radius = 0, lifespan = None, animated = False):        self.center = center        self.size = size        self.radius = radius        if lifespan:            self.lifespan = lifespan        else:            self.lifespan = float('inf')        self.animated = animated    def get_center(self):        return self.center    def get_size(self):        return self.size    def get_radius(self):        return self.radius    def get_lifespan(self):        return self.lifespan    def get_animated(self):        return self.animated        # debris images - debris1_brown.png, debris2_brown.png, debris3_brown.png, debris4_brown.png#                 debris1_blue.png, debris2_blue.png, debris3_blue.png, debris4_blue.png, debris_blend.pngdebris_info = ImageInfo([320, 240], [640, 480])debris_image = simplegui.load_image("http://commondatastorage.googleapis.com/codeskulptor-assets/lathrop/debris2_blue.png")# nebula images - nebula_brown.png, nebula_blue.pngnebula_info = ImageInfo([400, 300], [800, 600])nebula_image = simplegui.load_image("http://commondatastorage.googleapis.com/codeskulptor-assets/lathrop/nebula_blue.f2014.png")# splash imagesplash_info = ImageInfo([200, 150], [400, 300])splash_image = simplegui.load_image("http://commondatastorage.googleapis.com/codeskulptor-assets/lathrop/splash.png")# ship imageship_info = ImageInfo([45, 45], [90, 90], 35)ship_image = simplegui.load_image("http://commondatastorage.googleapis.com/codeskulptor-assets/lathrop/double_ship.png")# missile image - shot1.png, shot2.png, shot3.pngmissile_info = ImageInfo([5,5], [10, 10], 3, 50)missile_image = simplegui.load_image("http://commondatastorage.googleapis.com/codeskulptor-assets/lathrop/shot2.png")# asteroid images - asteroid_blue.png, asteroid_brown.png, asteroid_blend.pngasteroid_info = ImageInfo([45, 45], [90, 90], 40)asteroid_image = simplegui.load_image("http://commondatastorage.googleapis.com/codeskulptor-assets/lathrop/asteroid_blue.png")# animated explosion - explosion_orange.png, explosion_blue.png, explosion_blue2.png, explosion_alpha.pngexplosion_info = ImageInfo([64, 64], [128, 128], 17, 24, True)explosion_image = simplegui.load_image("http://commondatastorage.googleapis.com/codeskulptor-assets/lathrop/explosion_alpha.png")# sound assets purchased from sounddogs.com, please do not redistributesoundtrack = simplegui.load_sound("http://commondatastorage.googleapis.com/codeskulptor-assets/sounddogs/soundtrack.mp3")missile_sound = simplegui.load_sound("http://commondatastorage.googleapis.com/codeskulptor-assets/sounddogs/missile.mp3")missile_sound.set_volume(.5)ship__sound = simplegui.load_sound("http://commondatastorage.googleapis.com/codeskulptor-assets/sounddogs/thrust.mp3")explosion_sound = simplegui.load_sound("http://commondatastorage.googleapis.com/codeskulptor-assets/sounddogs/explosion.mp3")# helper functions to handle transformationsdef angle_to_vector(ang):    return [math.cos(ang), math.sin(ang)]def dist(p,q):    return math.sqrt((p[0] - q[0]) ** 2+(p[1] - q[1]) ** 2)# Ship classclass Ship:    def __init__(self, pos, vel, angle, image, info):        self.pos = [pos[0],pos[1]]        self.vel = [vel[0],vel[1]]        self.thrust = False        self.angle = angle        self.angle_vel = 0        self.image = image        self.image_center = info.get_center()        self.image_size = info.get_size()        self.radius = info.get_radius()            def draw(self,canvas):        #canvas.draw_circle(self.pos, self.radius, 1, "White", "White")        if self.thrust:            canvas.draw_image(self.image, [self.image_center[0]+self.image_size[0],self.image_center[1]], self.image_size, self.pos, self.image_size, self.angle)        else:            canvas.draw_image(self.image, self.image_center, self.image_size, self.pos, self.image_size, self.angle)    def update(self):        # angle update        self.angle += self.angle_vel        # position update        self.pos[0] += self.vel[0]        self.pos[1] += self.vel[1]        self.pos[0] %= WIDTH        self.pos[1] %= HEIGHT        # friction update        self.vel[0] *=(1-friction_para)        self.vel[1] *=(1-friction_para)        # velocity update        if self.thrust:            self.vel[0] += angle_to_vector(self.angle)[0]            self.vel[1] += angle_to_vector(self.angle)[1]            ship__sound.play()            ship__sound.set_volume(vol / 10.0)          else:            ship__sound.rewind()    def shoot(self):        global a_missile        pos_missile = [0,0]        vel_missile = [0,0]        pos_missile[0] = self.pos[0]+ self.radius * angle_to_vector(self.angle)[0]        pos_missile[1] = self.pos[1]+ self.radius * angle_to_vector(self.angle)[1]        vel_missile[0] = self.vel[0] + angle_to_vector(self.angle)[0] * 2        vel_missile[1] = self.vel[1] + angle_to_vector(self.angle)[1] * 2        a_missile = Sprite(pos_missile, vel_missile, self.angle, 0, missile_image, missile_info, missile_sound)    # Sprite classclass Sprite:    def __init__(self, pos, vel, ang, ang_vel, image, info, sound = None):        self.pos = [pos[0],pos[1]]        self.vel = [vel[0],vel[1]]        self.angle = ang        self.angle_vel = ang_vel        self.image = image        self.image_center = info.get_center()        self.image_size = info.get_size()        self.radius = info.get_radius()        self.lifespan = info.get_lifespan()        self.animated = info.get_animated()        self.age = 0        if sound:            sound.rewind()            sound.play()       def draw(self, canvas):        canvas.draw_image(self.image, self.image_center, self.image_size, self.pos, self.image_size, self.angle)        def update(self):        self.angle += self.angle_vel        self.pos[0] += self.vel[0]        self.pos[1] += self.vel[1]                self.pos[0] %= WIDTH        self.pos[1] %= HEIGHT           def draw(canvas):    global time        # animiate background    time += 1    wtime = (time / 4) % WIDTH    center = debris_info.get_center()    size = debris_info.get_size()    canvas.draw_image(nebula_image, nebula_info.get_center(), nebula_info.get_size(), [WIDTH / 2, HEIGHT / 2], [WIDTH, HEIGHT])    canvas.draw_image(debris_image, center, size, (wtime - WIDTH / 2, HEIGHT / 2), (WIDTH, HEIGHT))    canvas.draw_image(debris_image, center, size, (wtime + WIDTH / 2, HEIGHT / 2), (WIDTH, HEIGHT))    # draw ship and sprites    my_ship.draw(canvas)    a_rock.draw(canvas)    a_missile.draw(canvas)        # update ship and sprites    my_ship.update()    a_rock.update()    a_missile.update()        # draw Lives and score    canvas.draw_text('Lives', (20, 30), 24, 'White')    canvas.draw_text('Score', (700, 30), 24, 'White')    canvas.draw_text(str(lives), (20, 50), 24, 'White')    canvas.draw_text(str(score), (700, 50), 24, 'White')# timer handler that spawns a rock    def rock_spawner():    global a_rock    pos = [random.random() * WIDTH, random.random() * HEIGHT]    vel = [random.random(), random.random()]    ang_vel = random.random() * 0.1    a_rock = Sprite(pos, vel, 0, ang_vel, asteroid_image, asteroid_info)def keydown(key):      if key==simplegui.KEY_MAP['space']:        my_ship.shoot()    elif key==simplegui.KEY_MAP['left']:        my_ship.angle_vel -= 0.1    elif key==simplegui.KEY_MAP['right']:        my_ship.angle_vel += 0.1    elif key==simplegui.KEY_MAP["up"]:        my_ship.thrust = Truedef keyup(key):        if key==simplegui.KEY_MAP["space"]:        a=1    elif key==simplegui.KEY_MAP["left"]:        my_ship.angle_vel = 0    elif key==simplegui.KEY_MAP["right"]:        my_ship.angle_vel = 0    elif key==simplegui.KEY_MAP["up"]:        my_ship.thrust = False          # initialize frameframe = simplegui.create_frame("Asteroids", WIDTH, HEIGHT)# initialize ship and two spritesmy_ship = Ship([WIDTH / 2, HEIGHT / 2], [0, 0], 2, ship_image, ship_info)a_rock = Sprite([WIDTH / 3, HEIGHT / 3], [1, 1], 0, .1, asteroid_image, asteroid_info)a_missile = Sprite([2 * WIDTH / 3, 2 * HEIGHT / 3], [-1,1], 0, 0, missile_image, missile_info, missile_sound)# register handlersframe.set_draw_handler(draw)frame.set_keydown_handler(keydown)frame.set_keyup_handler(keyup)timer = simplegui.create_timer(1000.0, rock_spawner)# get things rollingtimer.start()frame.start()