Python Arcade – 添加移动平台
在本文中，我们将讨论如何在Python为我们的街机游戏添加移动平台。
添加移动平台
我们可以按照以下步骤轻松地在街机游戏中添加移动平台：
- 为移动平台的精灵和速度创建 2 个新变量。
self.moving_vel = 3
self.moving_platform = None- 加载精灵并添加初始坐标。
self.moving_platform = arcade.Sprite("Moving.png",1)
self.moving_platform.center_x = 500
self.moving_platform.center_y = 500- 更新平台的 y 坐标。
self.moving_platform.center_y -= self.moving_vel- 如果平台越过边界，则改变平台的方向。
if self.moving_platform.center_y < 100 or self.moving_platform.center_y>600:
self.moving_vel *= -1使用的精灵：
为此，我们将创建一个 MainGame() 类。在这个类中，我们首先要为玩家的速度、平台速度、相机、玩家精灵、物理引擎和我们的场景初始化一些变量。之后，我们将在这个类中创建 6 个函数。
- on_draw()：在这个函数，我们将使用我们的相机，然后我们将绘制我们的场景。
- setup()：在这个函数，我们将初始化我们的相机和场景对象，然后我们将加载我们的播放器和平台的精灵。之后，我们将调用 PhysicsEnginePlatformer()函数。
- on_update()：在这个函数，我们将通过添加速度变量的值来更新玩家精灵的 x 坐标，我们还更新我们移动平台的 y 坐标。之后，我们将调用我们的 camera_move()函数。
- on_key_press()：在这个函数，我们将根据按下的键盘键来改变 vel_x 变量的值。
- on_key_release()：在这个函数，我们会根据释放的键盘按键来改变vel_x变量的值。
- camera_move()：在这个函数，我们将根据玩家当前的位置改变相机的位置。
下面是实现：
Python3
# Importing arcade module
import arcade
# Creating MainGame class
class MainGame(arcade.Window):
def __init__(self):
super().__init__(600, 600, title="Player Movement")
# Initializing a variable to store
# the velocity of the player
self.vel_x = 0
# Creating variable for Camera
self.camera = None
# Creating variable for moving velocity
self.moving_vel = 3
# Creating variable for Platform
self.moving_platform = None
# Creating scene object
self.scene = None
# Creating variable to store player sprite
self.player = None
# Creating variable for our game engine
self.physics_engine = None
# Creating on_draw() function to draw on the screen
def on_draw(self):
arcade.start_render()
# Using the camera
self.camera.use()
# Drawing our scene
self.scene.draw()
def setup(self):
# Initialize Scene object
self.scene = arcade.Scene()
# Using Camera() function
self.camera= arcade.Camera(600,600)
# Creating different sprite lists
self.scene.add_sprite_list("Player")
self.scene.add_sprite_list("Platforms", use_spatial_hash=True)
# Adding player sprite
self.player_sprite = arcade.Sprite("Player.png", 1)
# Adding coordinates for the center of the sprite
self.player_sprite.center_x = 64
self.player_sprite.center_y = 600
#Adding Sprite in our scene
self.scene.add_sprite("Player", self.player_sprite)
#Adding moving Platform sprite
self.moving_platform = arcade.Sprite("Moving.png",1)
# Adding starting coordinates
self.moving_platform.center_x = 500
self.moving_platform.center_y = 500
# Adding to Platforms sprite group
self.scene.add_sprite("Platforms", self.moving_platform)
# Adding platform sprite according to level
platform = arcade.Sprite(f"Platform.png", 1)
# Adding coordinates for the center of the platform
platform.center_x = 300
platform.center_y = 32
self.scene.add_sprite("Platforms", platform)
# Creating Physics engine
self.physics_engine = arcade.PhysicsEnginePlatformer(
self.player_sprite,
self.scene.get_sprite_list("Platforms"),
0.5
)
# Creating on_update function to
# update the x coordinate
def on_update(self,delta_time):
# Changing x coordinate of player
self.player_sprite.center_x += self.vel_x * delta_time
# Updating the physics engine to move the player
self.physics_engine.update()
# Adding moving velocity in moving platform
self.moving_platform.center_y -= self.moving_vel
# Changing the direction
if self.moving_platform.center_y < 100 or
self.moving_platform.center_y>600:
self.moving_vel *= -1
# Calling the camera_move function
self.camera_move()
# Creating function to change the velocity
# when button is pressed
def on_key_press(self, symbol,modifier):
# Checking the button pressed
# and changing the value of velocity
if symbol == arcade.key.LEFT:
self.vel_x = -300
elif symbol == arcade.key.RIGHT:
self.vel_x = 300
elif symbol == arcade.key.UP:
if self.physics_engine.can_jump():
self.player_sprite.change_y = 15
# Creating function to change the velocity
# when button is released
def on_key_release(self, symbol, modifier):
# Checking the button released
# and changing the value of velocity
if symbol == arcade.key.LEFT:
self.vel_x = 0
elif symbol == arcade.key.RIGHT:
self.vel_x = 0
def camera_move(self):
# Getting the x coordinate for the center of camera
screen_x = self.player_sprite.center_x -
(self.camera.viewport_width / 2)
# Getting the y coordinate for the center of camera
screen_y = self.player_sprite.center_y -
(self.camera.viewport_height / 2)
# Moving the camera
self.camera.move_to([screen_x, screen_y])
# Calling MainGame class
game = MainGame()
game.setup()
arcade.run()输出：
