In this article, we will learn How we can add collisions in arcade games in Python.
Installation
You can install the Arcade module using the below command:
pip install arcade
Example 1:
In this example, we are going to use the check_for_collision() function to add collision between 2 sprites.
Syntax: arcade.check_for_collision( sprite1, sprite2)
Parameters:
- sprite1:- First sprite
- sprite2:- Second sprite
Returns: Boolean value
Sprites Used:
Below is the implementation:
Python3
# Importing arcade moduleimport arcade# Creating MainGame classclass 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 classgame = MainGame()game.setup()arcade.run() |
Output:
Example 2:
In this example, we are going to use PhysicsEnginePlatformer() function to add collision between our player and platform.
Syntax: arcade.PhysicsEnginePlatformer(player_sprite, platforms,, gravity, ladders)
Parameters:
- player_sprite:- The player sprite
- platforms:- The platform sprite list
- gravity:- Amount of gravity
- ladders:- Ladders the user can climb on
Sprites Used:
Below is the implementation:
Python3
# Importing arcade moduleimport arcade# Creating MainGame classclass 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 classgame = MainGame()game.setup()arcade.run() |
Output:
