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    #!/usr/bin/env python
    """ pygame.examples.chimp

    This simple example is used for the line-by-line tutorial
    that comes with pygame. It is based on a 'popular' web banner.
    Note there are comments here, but for the full explanation,
    follow along in the tutorial.
    """

    # Import Modules
    import os
    import pygame as pg
    from pygame.compat import geterror

    if not pg.font:
        print("Warning, fonts disabled")
    if not pg.mixer:
        print("Warning, sound disabled")

    main_dir = os.path.split(os.path.abspath(__file__))[0]
    data_dir = os.path.join(main_dir, "data")

    # functions to create our resources
    def load_image(name, colorkey=None):
        fullname = os.path.join(data_dir, name)
        try:
            image = pg.image.load(fullname)
        except pg.error:
            print("Cannot load image:", fullname)
            raise SystemExit(str(geterror()))
        image = image.convert()
        if colorkey is not None:
            if colorkey == -1:
                colorkey = image.get_at((0, 0))
            image.set_colorkey(colorkey, pg.RLEACCEL)
        return image, image.get_rect()

    def load_sound(name):
        class NoneSound:
            def play(self):
                pass

        if not pg.mixer or not pg.mixer.get_init():
            return NoneSound()
        fullname = os.path.join(data_dir, name)
        try:
            sound = pg.mixer.Sound(fullname)
        except pg.error:
            print("Cannot load sound: %s" % fullname)
            raise SystemExit(str(geterror()))
        return sound

    # classes for our game objects
    class Fist(pg.sprite.Sprite):
        """moves a clenched fist on the screen, following the mouse"""

        def __init__(self):
            pg.sprite.Sprite.__init__(self)  # call Sprite initializer
            self.image, self.rect = load_image("fist.bmp", -1)
            self.punching = 0

        def update(self):
            """move the fist based on the mouse position"""
            pos = pg.mouse.get_pos()
            self.rect.midtop = pos
            if self.punching:
                self.rect.move_ip(5, 10)

        def punch(self, target):
            """returns true if the fist collides with the target"""
            if not self.punching:
                self.punching = 1
                hitbox = self.rect.inflate(-5, -5)
                return hitbox.colliderect(target.rect)

        def unpunch(self):
            """called to pull the fist back"""
            self.punching = 0

    class Chimp(pg.sprite.Sprite):
        """moves a monkey critter across the screen. it can spin the
           monkey when it is punched."""

        def __init__(self):
            pg.sprite.Sprite.__init__(self)  # call Sprite intializer
            self.image, self.rect = load_image("chimp.bmp", -1)
            screen = pg.display.get_surface()
            self.area = screen.get_rect()
            self.rect.topleft = 10, 10
            self.move = 9
            self.dizzy = 0

        def update(self):
            """walk or spin, depending on the monkeys state"""
            if self.dizzy:
                self._spin()
            else:
                self._walk()

        def _walk(self):
            """move the monkey across the screen, and turn at the ends"""
            newpos = self.rect.move((self.move, 0))
            if not self.area.contains(newpos):
                if self.rect.left < self.area.left or self.rect.right > self.area.right:
                    self.move = -self.move
                    newpos = self.rect.move((self.move, 0))
                    self.image = pg.transform.flip(self.image, 1, 0)
                self.rect = newpos

        def _spin(self):
            """spin the monkey image"""
            center = self.rect.center
            self.dizzy = self.dizzy + 12
            if self.dizzy >= 360:
                self.dizzy = 0
                self.image = self.original
            else:
                rotate = pg.transform.rotate
                self.image = rotate(self.original, self.dizzy)
            self.rect = self.image.get_rect(center=center)

        def punched(self):
            """this will cause the monkey to start spinning"""
            if not self.dizzy:
                self.dizzy = 1
                self.original = self.image

    def main():
        """this function is called when the program starts.
           it initializes everything it needs, then runs in
           a loop until the function returns."""
        # Initialize Everything
        pg.init()
        screen = pg.display.set_mode((468, 60))
        pg.display.set_caption("Monkey Fever")
        pg.mouse.set_visible(0)

        # Create The Backgound
        background = pg.Surface(screen.get_size())
        background = background.convert()
        background.fill((250, 250, 250))

        # Put Text On The Background, Centered
        if pg.font:
            font = pg.font.Font(None, 36)
            text = font.render("Pummel The Chimp, And Win $$$", 1, (10, 10, 10))
            textpos = text.get_rect(centerx=background.get_width() / 2)
            background.blit(text, textpos)

        # Display The Background
        screen.blit(background, (0, 0))
        pg.display.flip()

        # Prepare Game Objects
        clock = pg.time.Clock()
        whiff_sound = load_sound("whiff.wav")
        punch_sound = load_sound("punch.wav")
        chimp = Chimp()
        fist = Fist()
        allsprites = pg.sprite.RenderPlain((fist, chimp))

        # Main Loop
        going = True
        while going:
            clock.tick(60)

            # Handle Input Events
            for event in pg.event.get():
                if event.type == pg.QUIT:
                    going = False
                elif event.type == pg.KEYDOWN and event.key == pg.K_ESCAPE:
                    going = False
                elif event.type == pg.MOUSEBUTTONDOWN:
                    if fist.punch(chimp):
                        punch_sound.play()  # punch
                        chimp.punched()
                    else:
                        whiff_sound.play()  # miss
                elif event.type == pg.MOUSEBUTTONUP:
                    fist.unpunch()

            allsprites.update()

            # Draw Everything
            screen.blit(background, (0, 0))
            allsprites.draw(screen)
            pg.display.flip()

        pg.quit()

    # Game Over

    # this calls the 'main' function when this script is executed
    if __name__ == "__main__":
        main()

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