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Pygame sprite collision detection

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by vsasikalabe dot icon Updated: Apr 7, 2023

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We first need to know how pygame detects collisions between sprites to implement collision detection. In pygame, every Sprite has a rect or “rectangle” object. This rectangle object has the same width and height as the Sprite to represent its boundaries. The background border line is created for the Sprite. It follows some specific properties like height, width, and colour. In Python, import sys access system-specific parameters and functions. 


Next, the player class is defined. The Sprite.group is a class in Pygame. It is also used to hold multiple Sprite objects. It also defined methods for collision detection and made the positions to update and render sprites much easier. Any image is represented using a Pygame Surface. Creating surfaces in a pygame is quite easy. We apply the height and the width to pygame.Surface() method. We can also use various methods to format our surface. For example, to draw shapes, we can use pygame.draw(), and to fill on the surface, we can use surface.fill() method. The collided function is used to detect the collision between the sprites. If the Sprite moves left from the background, it is displayed in the terminal as left. The same action is performed on all sides. The event is occurred by the mouse motion. 


Here is an example of how to detect collisions between sprites in PyGame: 

Preview of the output that you will get on running this code from your IDE.

Code

In this solution, we used pygame library.

Pygame sprite collision detection

Lines of Code : 64dotLicense : Strong Copyleft (CC BY-SA 4.0)

Dependent Libraries : 
import sys
import pygame as pg
from pygame.math import Vector2


class Background_Line(pg.sprite.Sprite):

    def __init__(self, width, height, posX, posY, side):
        super().__init__()
        self.image = pg.Surface([width, height])
        self.image.fill((200, 30, 30))
        self.rect = self.image.get_rect(topleft=(posX, posY))
        self.side = side


class Player(pg.sprite.Sprite):

    def __init__(self, pos, *groups):
        super().__init__(*groups)
        self.image = pg.Surface((30, 50))
        self.image.fill(pg.Color('steelblue2'))
        self.rect = self.image.get_rect(center=pos)


def main():
    screen = pg.display.set_mode((640, 480))
    clock = pg.time.Clock()

    all_sprites = pg.sprite.Group()
    player = Player((100, 300), all_sprites)
    background = pg.sprite.Group(
        Background_Line(10, 300, 175, 50, 'left'),
        Background_Line(10, 300, 450, 50, 'right'),
        Background_Line(285, 5, 175, 350, 'base')
        )
    all_sprites.add(background)

    done = False

    while not done:
        for event in pg.event.get():
            if event.type == pg.QUIT:
                done = True
            elif event.type == pg.MOUSEMOTION:
                player.rect.center = event.pos

        all_sprites.update()
        collided = pg.sprite.spritecollide(player, background, False)
        for line in collided:
            print(line.side)

        screen.fill((30, 30, 30))
        all_sprites.draw(screen)

        pg.display.flip()
        clock.tick(30)


if __name__ == '__main__':
    pg.init()
    main()
    pg.quit()
    sys.exit()

Instructions

Follow the steps carefully to get the output easily.

  1. Download and Install the PyCharm Community Edition on your computer.
  2. Open the terminal and install the required libraries with the following commands.
  3. Install pygame - pip install pygame.
  4. Create a new Python file on your IDE.
  5. Copy the snippet using the 'copy' button and paste it into your Python file.
  6. Run the current file to generate the output.


I hope you found this useful. I have added the link to dependent libraries, and version information in the following sections.


I found this code snippet by searching for ' pygame sprite collision detection ' in kandi. You can try any such use case!

Environment Tested

I tested this solution in the following versions. Be mindful of changes when working with other versions.

  1. The solution is created in PyCharm 2022.3.
  2. The solution is tested on Python 3.11.1
  3. pygame version- 2.3.0


Using this solution, we are able to do pygame sprite collision detection with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to do pygame sprite collision detection.

Dependent Libraries

PyGame-Learning-Environmentby ntasfi

Python doticonstar image 841 doticonVersion:Currentdoticon
License: Permissive (MIT)

PyGame Learning Environment (PLE) -- Reinforcement Learning Environment in Python.

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            PyGame-Learning-Environmentby ntasfi

            Python doticon star image 841 doticonVersion:Currentdoticon License: Permissive (MIT)

            PyGame Learning Environment (PLE) -- Reinforcement Learning Environment in Python.
            Support
              Quality
                Security
                  License
                    Reuse

                      If you do not have the pygame library that is required to run this code, you can install them by clicking on the above link.

                      You can search for any dependent library on kandi like pygame.

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