Python实现我的世界小游戏源代码_Python

移动
前进：W，后退：S，向左：A，向右：D，环顾四周:鼠标，跳起：空格键，切换飞行模式:Tab;
选择建筑材料
砖：1，草：2，沙子：3，删除建筑：鼠标左键单击，创建建筑块：鼠标右键单击
ESC退出程序。
完整程序包请通过文末地址下载，程序运行截图如下：
Python实现我的世界小游戏源代码
				?

									from __future__ import division

									import sys

									import math

									import random

									import time

									from collections import deque

									from pyglet import image

									from pyglet.gl import *

									from pyglet.graphics import TextureGroup

									from pyglet.window import key, mouse

									TICKS_PER_SEC = 60

									# Size of sectors used to ease block loading.

									SECTOR_SIZE = 16

									WALKING_SPEED = 5

									FLYING_SPEED = 15

									GRAVITY = 20.0

									MAX_JUMP_HEIGHT = 1.0 # About the height of a block.

									# To derive the formula for calculating jump speed, first solve

									#  v_t = v_0 + a * t

									# for the time at which you achieve maximum height, where a is the acceleration

									# due to gravity and v_t = 0. This gives:

									#  t = - v_0 / a

									# Use t and the desired MAX_JUMP_HEIGHT to solve for v_0 (jump speed) in

									#  s = s_0 + v_0 * t + (a * t^2) / 2

									JUMP_SPEED = math.sqrt(2 * GRAVITY * MAX_JUMP_HEIGHT)

									TERMINAL_VELOCITY = 50

									PLAYER_HEIGHT = 2

									if sys.version_info[0] >= 3:

									  xrange = range

									def cube_vertices(x, y, z, n):

									  """ Return the vertices of the cube at position x, y, z with size 2*n.

									  """

									  return [

									    x-n,y+n,z-n, x-n,y+n,z+n, x+n,y+n,z+n, x+n,y+n,z-n, # top

									    x-n,y-n,z-n, x+n,y-n,z-n, x+n,y-n,z+n, x-n,y-n,z+n, # bottom

									    x-n,y-n,z-n, x-n,y-n,z+n, x-n,y+n,z+n, x-n,y+n,z-n, # left

									    x+n,y-n,z+n, x+n,y-n,z-n, x+n,y+n,z-n, x+n,y+n,z+n, # right

									    x-n,y-n,z+n, x+n,y-n,z+n, x+n,y+n,z+n, x-n,y+n,z+n, # front

									    x+n,y-n,z-n, x-n,y-n,z-n, x-n,y+n,z-n, x+n,y+n,z-n, # back

									  ]

									def tex_coord(x, y, n=4):

									  """ Return the bounding vertices of the texture square.

									  """

									  m = 1.0 / n

									  dx = x * m

									  dy = y * m

									  return dx, dy, dx + m, dy, dx + m, dy + m, dx, dy + m

									def tex_coords(top, bottom, side):

									  """ Return a list of the texture squares for the top, bottom and side.

									  """

									  top = tex_coord(*top)

									  bottom = tex_coord(*bottom)

									  side = tex_coord(*side)

									  result = []

									  result.extend(top)

									  result.extend(bottom)

									  result.extend(side * 4)

									  return result

									TEXTURE_PATH = 'texture.png'

									GRASS = tex_coords((1, 0), (0, 1), (0, 0))

									SAND = tex_coords((1, 1), (1, 1), (1, 1))

									BRICK = tex_coords((2, 0), (2, 0), (2, 0))

									STONE = tex_coords((2, 1), (2, 1), (2, 1))

									FACES = [

									  ( 0, 1, 0),

									  ( 0,-1, 0),

									  (-1, 0, 0),

									  ( 1, 0, 0),

									  ( 0, 0, 1),

									  ( 0, 0,-1),

									]

									def normalize(position):

									  """ Accepts `position` of arbitrary precision and returns the block

									  containing that position.

									  Parameters

									  ----------

									  position : tuple of len 3

									  Returns

									  -------

									  block_position : tuple of ints of len 3

									  """

									  x, y, z = position

									  x, y, z = (int(round(x)), int(round(y)), int(round(z)))

									  return (x, y, z)

									def sectorize(position):

									  """ Returns a tuple representing the sector for the given `position`.

									  Parameters

									  ----------

									  position : tuple of len 3

									  Returns

									  -------

									  sector : tuple of len 3

									  """

									  x, y, z = normalize(position)

									  x, y, z = x // SECTOR_SIZE, y // SECTOR_SIZE, z // SECTOR_SIZE

									  return (x, 0, z)

									class Model(object):

									  def __init__(self):

									    # A Batch is a collection of vertex lists for batched rendering.

									    self.batch = pyglet.graphics.Batch()

									    # A TextureGroup manages an OpenGL texture.

									    self.group = TextureGroup(image.load(TEXTURE_PATH).get_texture())

									    # A mapping from position to the texture of the block at that position.

									    # This defines all the blocks that are currently in the world.

									    self.world = {}

									    # Same mapping as `world` but only contains blocks that are shown.

									    self.shown = {}

									    # Mapping from position to a pyglet `VertextList` for all shown blocks.

									    self._shown = {}

									    # Mapping from sector to a list of positions inside that sector.

									    self.sectors = {}

									    # Simple function queue implementation. The queue is populated with

									    # _show_block() and _hide_block() calls

									    self.queue = deque()

									    self._initialize()

									  def _initialize(self):

									    """ Initialize the world by placing all the blocks.

									    """

									    n = 80 # 1/2 width and height of world

									    s = 1 # step size

									    y = 0 # initial y height

									    for x in xrange(-n, n + 1, s):

									      for z in xrange(-n, n + 1, s):

									        # create a layer stone an grass everywhere.

									        self.add_block((x, y - 2, z), GRASS, immediate=False)

									        self.add_block((x, y - 3, z), STONE, immediate=False)

									        if x in (-n, n) or z in (-n, n):

									          # create outer walls.

									          for dy in xrange(-2, 3):

									            self.add_block((x, y + dy, z), STONE, immediate=False)

									    # generate the hills randomly

									    o = n - 10

									    for _ in xrange(120):

									      a = random.randint(-o, o) # x position of the hill

									      b = random.randint(-o, o) # z position of the hill

									      c = -1 # base of the hill

									      h = random.randint(1, 6) # height of the hill

									      s = random.randint(4, 8) # 2 * s is the side length of the hill

									      d = 1 # how quickly to taper off the hills

									      t = random.choice([GRASS, SAND, BRICK])

									      for y in xrange(c, c + h):

									        for x in xrange(a - s, a + s + 1):

									          for z in xrange(b - s, b + s + 1):

									            if (x - a) ** 2 + (z - b) ** 2 > (s + 1) ** 2:

									              continue

									            if (x - 0) ** 2 + (z - 0) ** 2 < 5 ** 2:

									              continue

									            self.add_block((x, y, z), t, immediate=False)

									        s -= d # decrement side lenth so hills taper off

									  def hit_test(self, position, vector, max_distance=8):

									    """ Line of sight search from current position. If a block is

									    intersected it is returned, along with the block previously in the line

									    of sight. If no block is found, return None, None.

									    Parameters

									    ----------

									    position : tuple of len 3

									      The (x, y, z) position to check visibility from.

									    vector : tuple of len 3

									      The line of sight vector.

									    max_distance : int

									      How many blocks away to search for a hit.

									    """

									    m = 8

									    x, y, z = position

									    dx, dy, dz = vector

									    previous = None

									    for _ in xrange(max_distance * m):

									      key = normalize((x, y, z))

									      if key != previous and key in self.world:

									        return key, previous

									      previous = key

									      x, y, z = x + dx / m, y + dy / m, z + dz / m

									    return None, None

									  def exposed(self, position):

									    """ Returns False is given `position` is surrounded on all 6 sides by

									    blocks, True otherwise.

									    """

									    x, y, z = position

									    for dx, dy, dz in FACES:

									      if (x + dx, y + dy, z + dz) not in self.world:

									        return True

									    return False

									  def add_block(self, position, texture, immediate=True):

									    """ Add a block with the given `texture` and `position` to the world.

									    Parameters

									    ----------

									    position : tuple of len 3

									      The (x, y, z) position of the block to add.

									    texture : list of len 3

									      The coordinates of the texture squares. Use `tex_coords()` to

									      generate.

									    immediate : bool

									      Whether or not to draw the block immediately.

									    """

									    if position in self.world:

									      self.remove_block(position, immediate)

									    self.world[position] = texture

									    self.sectors.setdefault(sectorize(position), []).append(position)

									    if immediate:

									      if self.exposed(position):

									        self.show_block(position)

									      self.check_neighbors(position)

									  def remove_block(self, position, immediate=True):

									    """ Remove the block at the given `position`.

									    Parameters

									    ----------

									    position : tuple of len 3

									      The (x, y, z) position of the block to remove.

									    immediate : bool

									      Whether or not to immediately remove block from canvas.

									    """

									    del self.world[position]

									    self.sectors[sectorize(position)].remove(position)

									    if immediate:

									      if position in self.shown:

									        self.hide_block(position)

									      self.check_neighbors(position)

									  def check_neighbors(self, position):

									    """ Check all blocks surrounding `position` and ensure their visual

									    state is current. This means hiding blocks that are not exposed and

									    ensuring that all exposed blocks are shown. Usually used after a block

									    is added or removed.

									    """

									    x, y, z = position

									    for dx, dy, dz in FACES:

									      key = (x + dx, y + dy, z + dz)

									      if key not in self.world:

									        continue

									      if self.exposed(key):

									        if key not in self.shown:

									          self.show_block(key)

									      else:

									        if key in self.shown:

									          self.hide_block(key)

									  def show_block(self, position, immediate=True):

									    """ Show the block at the given `position`. This method assumes the

									    block has already been added with add_block()

									    Parameters

									    ----------

									    position : tuple of len 3

									      The (x, y, z) position of the block to show.

									    immediate : bool

									      Whether or not to show the block immediately.

									    """

									    texture = self.world[position]

									    self.shown[position] = texture

									    if immediate:

									      self._show_block(position, texture)

									    else:

									      self._enqueue(self._show_block, position, texture)

									  def _show_block(self, position, texture):

									    """ Private implementation of the `show_block()` method.

									    Parameters

									    ----------

									    position : tuple of len 3

									      The (x, y, z) position of the block to show.

									    texture : list of len 3

									      The coordinates of the texture squares. Use `tex_coords()` to

									      generate.

									    """

									    x, y, z = position

									    vertex_data = cube_vertices(x, y, z, 0.5)

									    texture_data = list(texture)

									    # create vertex list

									    # FIXME Maybe `add_indexed()` should be used instead

									    self._shown[position] = self.batch.add(24, GL_QUADS, self.group,

									      ('v3f/static', vertex_data),

									      ('t2f/static', texture_data))

									  def hide_block(self, position, immediate=True):

									    """ Hide the block at the given `position`. Hiding does not remove the

									    block from the world.

									    Parameters

									    ----------

									    position : tuple of len 3

									      The (x, y, z) position of the block to hide.

									    immediate : bool

									      Whether or not to immediately remove the block from the canvas.

									    """

									    self.shown.pop(position)

									    if immediate:

									      self._hide_block(position)

									    else:

									      self._enqueue(self._hide_block, position)

									  def _hide_block(self, position):

									    """ Private implementation of the 'hide_block()` method.

									    """

									    self._shown.pop(position).delete()

									  def show_sector(self, sector):

									    """ Ensure all blocks in the given sector that should be shown are

									    drawn to the canvas.

									    """

									    for position in self.sectors.get(sector, []):

									      if position not in self.shown and self.exposed(position):

									        self.show_block(position, False)

									  def hide_sector(self, sector):

									    """ Ensure all blocks in the given sector that should be hidden are

									    removed from the canvas.

									    """

									    for position in self.sectors.get(sector, []):

									      if position in self.shown:

									        self.hide_block(position, False)

									  def change_sectors(self, before, after):

									    """ Move from sector `before` to sector `after`. A sector is a

									    contiguous x, y sub-region of world. Sectors are used to speed up

									    world rendering.

									    """

									    before_set = set()

									    after_set = set()

									    pad = 4

									    for dx in xrange(-pad, pad + 1):

									      for dy in [0]: # xrange(-pad, pad + 1):

									        for dz in xrange(-pad, pad + 1):

									          if dx ** 2 + dy ** 2 + dz ** 2 > (pad + 1) ** 2:

									            continue

									          if before:

									            x, y, z = before

									            before_set.add((x + dx, y + dy, z + dz))

									          if after:

									            x, y, z = after

									            after_set.add((x + dx, y + dy, z + dz))

									    show = after_set - before_set

									    hide = before_set - after_set

									    for sector in show:

									      self.show_sector(sector)

									    for sector in hide:

									      self.hide_sector(sector)

									  def _enqueue(self, func, *args):

									    """ Add `func` to the internal queue.

									    """

									    self.queue.append((func, args))

									  def _dequeue(self):

									    """ Pop the top function from the internal queue and call it.

									    """

									    func, args = self.queue.popleft()

									    func(*args)

									  def process_queue(self):

									    """ Process the entire queue while taking periodic breaks. This allows

									    the game loop to run smoothly. The queue contains calls to

									    _show_block() and _hide_block() so this method should be called if

									    add_block() or remove_block() was called with immediate=False

									    """

									    start = time.perf_counter()

									    while self.queue and time.time()- start < 1.0 / TICKS_PER_SEC:

									      self._dequeue()

									  def process_entire_queue(self):

									    """ Process the entire queue with no breaks.

									    """

									    while self.queue:

									      self._dequeue()

									class Window(pyglet.window.Window):

									  def __init__(self, *args, **kwargs):

									    super(Window, self).__init__(*args, **kwargs)

									    # Whether or not the window exclusively captures the mouse.

									    self.exclusive = False

									    # When flying gravity has no effect and speed is increased.

									    self.flying = False

									    # Strafing is moving lateral to the direction you are facing,

									    # e.g. moving to the left or right while continuing to face forward.

									    #

									    # First element is -1 when moving forward, 1 when moving back, and 0

									    # otherwise. The second element is -1 when moving left, 1 when moving

									    # right, and 0 otherwise.

									    self.strafe = [0, 0]

									    # Current (x, y, z) position in the world, specified with floats. Note

									    # that, perhaps unlike in math class, the y-axis is the vertical axis.

									    self.position = (0, 0, 0)

									    # First element is rotation of the player in the x-z plane (ground

									    # plane) measured from the z-axis down. The second is the rotation

									    # angle from the ground plane up. Rotation is in degrees.

									    #

									    # The vertical plane rotation ranges from -90 (looking straight down) to

									    # 90 (looking straight up). The horizontal rotation range is unbounded.

									    self.rotation = (0, 0)

									    # Which sector the player is currently in.

									    self.sector = None

									    # The crosshairs at the center of the screen.

									    self.reticle = None

									    # Velocity in the y (upward) direction.

									    self.dy = 0

									    # A list of blocks the player can place. Hit num keys to cycle.

									    self.inventory = [BRICK, GRASS, SAND]

									    # The current block the user can place. Hit num keys to cycle.

									    self.block = self.inventory[0]

									    # Convenience list of num keys.

									    self.num_keys = [

									      key._1, key._2, key._3, key._4, key._5,

									      key._6, key._7, key._8, key._9, key._0]

									    # Instance of the model that handles the world.

									    self.model = Model()

									    # The label that is displayed in the top left of the canvas.

									    self.label = pyglet.text.Label('', font_name='Arial', font_size=18,

									      x=10, y=self.height - 10, anchor_x='left', anchor_y='top',

									      color=(0, 0, 0, 255))

									    # This call schedules the `update()` method to be called

									    # TICKS_PER_SEC. This is the main game event loop.

									    pyglet.clock.schedule_interval(self.update, 1.0 / TICKS_PER_SEC)

									  def set_exclusive_mouse(self, exclusive):

									    """ If `exclusive` is True, the game will capture the mouse, if False

									    the game will ignore the mouse.

									    """

									    super(Window, self).set_exclusive_mouse(exclusive)

									    self.exclusive = exclusive

									  def get_sight_vector(self):

									    """ Returns the current line of sight vector indicating the direction

									    the player is looking.

									    """

									    x, y = self.rotation

									    # y ranges from -90 to 90, or -pi/2 to pi/2, so m ranges from 0 to 1 and

									    # is 1 when looking ahead parallel to the ground and 0 when looking

									    # straight up or down.

									    m = math.cos(math.radians(y))

									    # dy ranges from -1 to 1 and is -1 when looking straight down and 1 when

									    # looking straight up.

									    dy = math.sin(math.radians(y))

									    dx = math.cos(math.radians(x - 90)) * m

									    dz = math.sin(math.radians(x - 90)) * m

									    return (dx, dy, dz)

									  def get_motion_vector(self):

									    """ Returns the current motion vector indicating the velocity of the

									    player.

									    Returns

									    -------

									    vector : tuple of len 3

									      Tuple containing the velocity in x, y, and z respectively.

									    """

									    if any(self.strafe):

									      x, y = self.rotation

									      strafe = math.degrees(math.atan2(*self.strafe))

									      y_angle = math.radians(y)

									      x_angle = math.radians(x + strafe)

									      if self.flying:

									        m = math.cos(y_angle)

									        dy = math.sin(y_angle)

									        if self.strafe[1]:

									          # Moving left or right.

									          dy = 0.0

									          m = 1

									        if self.strafe[0] > 0:

									          # Moving backwards.

									          dy *= -1

									        # When you are flying up or down, you have less left and right

									        # motion.

									        dx = math.cos(x_angle) * m

									        dz = math.sin(x_angle) * m

									      else:

									        dy = 0.0

									        dx = math.cos(x_angle)

									        dz = math.sin(x_angle)

									    else:

									      dy = 0.0

									      dx = 0.0

									      dz = 0.0

									    return (dx, dy, dz)

									  def update(self, dt):

									    """ This method is scheduled to be called repeatedly by the pyglet

									    clock.

									    Parameters

									    ----------

									    dt : float

									      The change in time since the last call.

									    """

									    self.model.process_queue()

									    sector = sectorize(self.position)

									    if sector != self.sector:

									      self.model.change_sectors(self.sector, sector)

									      if self.sector is None:

									        self.model.process_entire_queue()

									      self.sector = sector

									    m = 8

									    dt = min(dt, 0.2)

									    for _ in xrange(m):

									      self._update(dt / m)

									  def _update(self, dt):

									    """ Private implementation of the `update()` method. This is where most

									    of the motion logic lives, along with gravity and collision detection.

									    Parameters

									    ----------

									    dt : float

									      The change in time since the last call.

									    """

									    # walking

									    speed = FLYING_SPEED if self.flying else WALKING_SPEED

									    d = dt * speed # distance covered this tick.

									    dx, dy, dz = self.get_motion_vector()

									    # New position in space, before accounting for gravity.

									    dx, dy, dz = dx * d, dy * d, dz * d

									    # gravity

									    if not self.flying:

									      # Update your vertical speed: if you are falling, speed up until you

									      # hit terminal velocity; if you are jumping, slow down until you

									      # start falling.

									      self.dy -= dt * GRAVITY

									      self.dy = max(self.dy, -TERMINAL_VELOCITY)

									      dy += self.dy * dt

									    # collisions

									    x, y, z = self.position

									    x, y, z = self.collide((x + dx, y + dy, z + dz), PLAYER_HEIGHT)

									    self.position = (x, y, z)

									  def collide(self, position, height):

									    """ Checks to see if the player at the given `position` and `height`

									    is colliding with any blocks in the world.

									    Parameters

									    ----------

									    position : tuple of len 3

									      The (x, y, z) position to check for collisions at.

									    height : int or float

									      The height of the player.

									    Returns

									    -------

									    position : tuple of len 3

									      The new position of the player taking into account collisions.

									    """

									    # How much overlap with a dimension of a surrounding block you need to

									    # have to count as a collision. If 0, touching terrain at all counts as

									    # a collision. If .49, you sink into the ground, as if walking through

									    # tall grass. If >= .5, you'll fall through the ground.

									    pad = 0.25

									    p = list(position)

									    np = normalize(position)

									    for face in FACES: # check all surrounding blocks

									      for i in xrange(3): # check each dimension independently

									        if not face[i]:

									          continue

									        # How much overlap you have with this dimension.

									        d = (p[i] - np[i]) * face[i]

									        if d < pad:

									          continue

									        for dy in xrange(height): # check each height

									          op = list(np)

									          op[1] -= dy

									          op[i] += face[i]

									          if tuple(op) not in self.model.world:

									            continue

									          p[i] -= (d - pad) * face[i]

									          if face == (0, -1, 0) or face == (0, 1, 0):

									            # You are colliding with the ground or ceiling, so stop

									            # falling / rising.

									            self.dy = 0

									          break

									    return tuple(p)

									  def on_mouse_press(self, x, y, button, modifiers):

									    """ Called when a mouse button is pressed. See pyglet docs for button

									    amd modifier mappings.

									    Parameters

									    ----------

									    x, y : int

									      The coordinates of the mouse click. Always center of the screen if

									      the mouse is captured.

									    button : int

									      Number representing mouse button that was clicked. 1 = left button,

									      4 = right button.

									    modifiers : int

									      Number representing any modifying keys that were pressed when the

									      mouse button was clicked.

									    """

									    if self.exclusive:

									      vector = self.get_sight_vector()

									      block, previous = self.model.hit_test(self.position, vector)

									      if (button == mouse.RIGHT) or \

									          ((button == mouse.LEFT) and (modifiers & key.MOD_CTRL)):

									        # ON OSX, control + left click = right click.

									        if previous:

									          self.model.add_block(previous, self.block)

									      elif button == pyglet.window.mouse.LEFT and block:

									        texture = self.model.world[block]

									        if texture != STONE:

									          self.model.remove_block(block)

									    else:

									      self.set_exclusive_mouse(True)

									  def on_mouse_motion(self, x, y, dx, dy):

									    """ Called when the player moves the mouse.

									    Parameters

									    ----------

									    x, y : int

									      The coordinates of the mouse click. Always center of the screen if

									      the mouse is captured.

									    dx, dy : float

									      The movement of the mouse.

									    """

									    if self.exclusive:

									      m = 0.15

									      x, y = self.rotation

									      x, y = x + dx * m, y + dy * m

									      y = max(-90, min(90, y))

									      self.rotation = (x, y)

									  def on_key_press(self, symbol, modifiers):

									    """ Called when the player presses a key. See pyglet docs for key

									    mappings.

									    Parameters

									    ----------

									    symbol : int

									      Number representing the key that was pressed.

									    modifiers : int

									      Number representing any modifying keys that were pressed.

									    """

									    if symbol == key.W:

									      self.strafe[0] -= 1

									    elif symbol == key.S:

									      self.strafe[0] += 1

									    elif symbol == key.A:

									      self.strafe[1] -= 1

									    elif symbol == key.D:

									      self.strafe[1] += 1

									    elif symbol == key.SPACE:

									      if self.dy == 0:

									        self.dy = JUMP_SPEED

									    elif symbol == key.ESCAPE:

									      self.set_exclusive_mouse(False)

									    elif symbol == key.TAB:

									      self.flying = not self.flying

									    elif symbol in self.num_keys:

									      index = (symbol - self.num_keys[0]) % len(self.inventory)

									      self.block = self.inventory[index]

									  def on_key_release(self, symbol, modifiers):

									    """ Called when the player releases a key. See pyglet docs for key

									    mappings.

									    Parameters

									    ----------

									    symbol : int

									      Number representing the key that was pressed.

									    modifiers : int

									      Number representing any modifying keys that were pressed.

									    """

									    if symbol == key.W:

									      self.strafe[0] += 1

									    elif symbol == key.S:

									      self.strafe[0] -= 1

									    elif symbol == key.A:

									      self.strafe[1] += 1

									    elif symbol == key.D:

									      self.strafe[1] -= 1

									  def on_resize(self, width, height):

									    """ Called when the window is resized to a new `width` and `height`.

									    """

									    # label

									    self.label.y = height - 10

									    # reticle

									    if self.reticle:

									      self.reticle.delete()

									    x, y = self.width // 2, self.height // 2

									    n = 10

									    self.reticle = pyglet.graphics.vertex_list(4,

									      ('v2i', (x - n, y, x + n, y, x, y - n, x, y + n))

									    )

									  def set_2d(self):

									    """ Configure OpenGL to draw in 2d.

									    """

									    width, height = self.get_size()

									    glDisable(GL_DEPTH_TEST)

									    viewport = self.get_viewport_size()

									    glViewport(0, 0, max(1, viewport[0]), max(1, viewport[1]))

									    glMatrixMode(GL_PROJECTION)

									    glLoadIdentity()

									    glOrtho(0, max(1, width), 0, max(1, height), -1, 1)

									    glMatrixMode(GL_MODELVIEW)

									    glLoadIdentity()

									  def set_3d(self):

									    """ Configure OpenGL to draw in 3d.

									    """

									    width, height = self.get_size()

									    glEnable(GL_DEPTH_TEST)

									    viewport = self.get_viewport_size()

									    glViewport(0, 0, max(1, viewport[0]), max(1, viewport[1]))

									    glMatrixMode(GL_PROJECTION)

									    glLoadIdentity()

									    gluPerspective(65.0, width / float(height), 0.1, 60.0)

									    glMatrixMode(GL_MODELVIEW)

									    glLoadIdentity()

									    x, y = self.rotation

									    glRotatef(x, 0, 1, 0)

									    glRotatef(-y, math.cos(math.radians(x)), 0, math.sin(math.radians(x)))

									    x, y, z = self.position

									    glTranslatef(-x, -y, -z)

									  def on_draw(self):

									    """ Called by pyglet to draw the canvas.

									    """

									    self.clear()

									    self.set_3d()

									    glColor3d(1, 1, 1)

									    self.model.batch.draw()

									    self.draw_focused_block()

									    self.set_2d()

									    self.draw_label()

									    self.draw_reticle()

									  def draw_focused_block(self):

									    """ Draw black edges around the block that is currently under the

									    crosshairs.

									    """

									    vector = self.get_sight_vector()

									    block = self.model.hit_test(self.position, vector)[0]

									    if block:

									      x, y, z = block

									      vertex_data = cube_vertices(x, y, z, 0.51)

									      glColor3d(0, 0, 0)

									      glPolygonMode(GL_FRONT_AND_BACK, GL_LINE)

									      pyglet.graphics.draw(24, GL_QUADS, ('v3f/static', vertex_data))

									      glPolygonMode(GL_FRONT_AND_BACK, GL_FILL)

									  def draw_label(self):

									    """ Draw the label in the top left of the screen.

									    """

									    x, y, z = self.position

									    self.label.text = '%02d (%.2f, %.2f, %.2f) %d / %d' % (

									      pyglet.clock.get_fps(), x, y, z,

									      len(self.model._shown), len(self.model.world))

									    self.label.draw()

									  def draw_reticle(self):

									    """ Draw the crosshairs in the center of the screen.

									    """

									    glColor3d(0, 0, 0)

									    self.reticle.draw(GL_LINES)

									def setup_fog():

									  """ Configure the OpenGL fog properties.

									  """

									  # Enable fog. Fog "blends a fog color with each rasterized pixel fragment's

									  # post-texturing color."

									  glEnable(GL_FOG)

									  # Set the fog color.

									  glFogfv(GL_FOG_COLOR, (GLfloat * 4)(0.5, 0.69, 1.0, 1))

									  # Say we have no preference between rendering speed and quality.

									  glHint(GL_FOG_HINT, GL_DONT_CARE)

									  # Specify the equation used to compute the blending factor.

									  glFogi(GL_FOG_MODE, GL_LINEAR)

									  # How close and far away fog starts and ends. The closer the start and end,

									  # the denser the fog in the fog range.

									  glFogf(GL_FOG_START, 20.0)

									  glFogf(GL_FOG_END, 60.0)

									def setup():

									  """ Basic OpenGL configuration.

									  """

									  # Set the color of "clear", i.e. the sky, in rgba.

									  glClearColor(0.5, 0.69, 1.0, 1)

									  # Enable culling (not rendering) of back-facing facets -- facets that aren't

									  # visible to you.

									  glEnable(GL_CULL_FACE)

									  # Set the texture minification/magnification function to GL_NEAREST (nearest

									  # in Manhattan distance) to the specified texture coordinates. GL_NEAREST

									  # "is generally faster than GL_LINEAR, but it can produce textured 图片

									  # with sharper edges because the transition between texture elements is not

									  # as smooth."

									  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST)

									  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST)

									  setup_fog()

									def main():

									  window = Window(width=1800, height=1600, caption='Pyglet', resizable=True)

									  # Hide the mouse cursor and prevent the mouse from leaving the window.

									  window.set_exclusive_mouse(True)

									  setup()

									  pyglet.app.run()

									if __name__ == '__main__':

									  main()