Python Arcade: detección de colisiones

En este artículo, aprenderemos cómo podemos agregar colisiones en juegos de arcade en Python.

Instalación

Puede instalar el módulo Arcade usando el siguiente comando:

pip install arcade

Ejemplo 1:

En este ejemplo, vamos a usar la función check_for_collision() para agregar colisión entre 2 sprites.

Sintaxis: arcade.check_for_colision( sprite1, sprite2)

Parámetros:

• sprite1:- Primer objeto
• sprite2: – Segundo objeto

Devuelve: valor booleano

Sprites usados:

A continuación se muestra la implementación:

# 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 Player1 and Player2
        self.vel_x1 = 380
        self.vel_x2 = 380
 
        self.scene = None
 
        # Creating variable to store player sprite
        self.player1 = None
 
        # Creating variable to store player sprite
        self.player2 = None
 
    # Creating on_draw() function to draw on the screen
    def on_draw(self):
        arcade.start_render()
 
        # Drawing the scene
        self.scene.draw()
 
    def setup(self):
 
        # Creating scene
        self.scene = arcade.Scene()
 
        # Adding player sprite
        self.player_sprite1 = arcade.Sprite("Player.png", 1)
        self.player_sprite2 = arcade.Sprite("Player2.png", 1)
 
        # Adding coordinates for the center of the sprite
        self.player_sprite1.center_x = 20
        self.player_sprite1.center_y = 300
 
        # Adding coordinates for the center of the sprite
        self.player_sprite2.center_x = 580
        self.player_sprite2.center_y = 300
 
        # Adding sprites in scene
        self.scene.add_sprite('Player', self.player_sprite1)
        self.scene.add_sprite('Player', self.player_sprite2)
 
    # Creating on_update function to
    # update the x coordinate
    def on_update(self, delta_time):
 
        # Changing x coordinate of players
        self.player_sprite1.center_x += self.vel_x1 * delta_time
        self.player_sprite2.center_x -= self.vel_x2 * delta_time
 
        # Checking if sprites are colliding or not
        colliding = arcade.check_for_collision(
            self.player_sprite1, self.player_sprite2)
 
        # If sprites are colliding then changing direction
        if colliding:
            self.vel_x1 *= -1
            self.vel_x2 *= -1
 
        # Changing the direction if sprites crosses the screen boundary
        if self.player_sprite1.center_x > 600 or self.player_sprite1.center_x < 0:
            self.vel_x1 *= -1
 
        if self.player_sprite2.center_x > 600 or self.player_sprite2.center_x < 0:
            self.vel_x2 *= -1
 
 
# Calling MainGame class
game = MainGame()
game.setup()
arcade.run()

Producción:

Ejemplo 2:

En este ejemplo, vamos a utilizar la función PhysicsEnginePlatformer() para agregar una colisión entre nuestro reproductor y la plataforma.

Sintaxis: arcade.PhysicsEnginePlatformer(player_sprite, plataformas, gravedad, escaleras)

Parámetros:

• player_sprite: – El sprite del jugador
• plataformas: – La lista de sprites de la plataforma
• gravedad: – Cantidad de gravedad
• escaleras: – Escaleras en las que el usuario puede subir

Sprites usados:

A continuación se muestra la implementación:

# 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 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()
 
        # Drawing our scene
        self.scene.draw()
 
    def setup(self):
       
        # Initialize Scene object
        self.scene = arcade.Scene()
 
        # 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 platform sprite
        platform = arcade.Sprite("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()
 
    # 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
 
    # 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
 
# Calling MainGame class
game = MainGame()
game.setup()
arcade.run()

Producción: