Moving a sprite in response to keyboard events in PyGame

by sneha@openweaver.com Updated: Apr 18, 2023

Solution Kit

A sprite is an object in a Pygame program that can be moved around on the screen. A sprite typically consists of an image, a rect (position and size) and a list of associated attributes like velocity, acceleration, and behaviour. Sprites can represent characters, projectiles, scenery, or any other game element.

Moving a sprite in response to keyboard events is a form of game programming where the game responds to user input in key presses. When the user presses a certain key, the game will move the sprite in a predetermined direction. This allows for a more interactive gaming experience by allowing the user to control their character or other objects in the game.

Pygame is a set of Python modules designed for writing video games. It is open source and free to use, and it provides functionalities such as image handling and sound playback that can be used to create games in Python. Pygame is an easy way to start programming games, and it has been used to create many popular games.

Here is an example of Moving a sprite in response to keyboard events in PyGame

Fig1: Preview of the Code

Fig2: Preview of the Output when code is run in IDE.

Fig3: Preview of the Output when left and down keys are pressed respectfully.

Code

In this solution, we will be moving a sprite in response to keyboard events in PyGame.

pygame hold key to move

PythonLines of Code : 65License : Strong Copyleft (CC BY-SA 4.0)

Dependent Libraries :

import pygame
import sys

class Character(object):
    def __init__(self, x=0, y=0, speed=0):
        self.x = x
        self.y = y
        self.speed = speed
        self.image = pygame.image.load('hero.png')

    def get_size(self):
        return self.image.get_size()

    def draw(self):
        display.blit(self.image, (self.x, self.y))

pygame.init()
(width, height) = (800, 600)
display = pygame.display.set_mode((width, height))
pygame.display.set_caption('Platforms')
clock = pygame.time.Clock()
hero = Character(speed=5)
hero_width, hero_height = hero.get_size()
hero.x = width/2.0 - hero_width/2.0
hero.y = height/2.0 - hero_height/2.0
black = (0,0,0)
pressed_keys = {"left": False, "right": False, "up": False, "down": False}

while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                pressed_keys["left"] = True
            if event.key == pygame.K_RIGHT:
                pressed_keys["right"] = True
            if event.key == pygame.K_UP:
                pressed_keys["up"] = True
            if event.key == pygame.K_DOWN:
                pressed_keys["down"] = True
        elif event.type == pygame.KEYUP:
            if event.key == pygame.K_LEFT:
                pressed_keys["left"] = False
            if event.key == pygame.K_RIGHT:
                pressed_keys["right"] = False
            if event.key == pygame.K_UP:
                pressed_keys["up"] = False
            if event.key == pygame.K_DOWN:
                pressed_keys["down"] = False

    if pressed_keys["left"]:# == True is implied here
        hero.x -= hero.speed
    if pressed_keys["right"]:
        hero.x += hero.speed
    if pressed_keys["up"]:
        hero.y -= hero.speed
    if pressed_keys["down"]:
        hero.y += hero.speed

    display.fill(black) 
    hero.draw()
    pygame.display.update()
    clock.tick(60)

Instructions

Install Jupyter Notebook on your computer.
Open terminal and install the required libraries with following commands.
Install Pygame - pip install pygame
Copy the snippet using the 'copy' button and paste it into that file.
Run the file using run button.

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

I found this code snippet by searching for "Keyboard hold keys to move in PyGame" in kandi. You can try any such use case!

Dependent Libraries

pygameby pygame

6066

Version:2.5.0.dev2

License: No License (null)

🐍🎮 pygame (the library) is a Free and Open Source python programming language library for making multimedia applications like games built on top of the excellent SDL library. C, Python, Native, OpenGL.

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pygameby pygame

C 6066 Version:2.5.0.dev2 License: No License

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If you do not have Pygame that is required to run this code, you can install it by clicking on the above link and copying the pip Install command from the Pygame page in kandi.

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

Environment Tested

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

The solution is created in Python3.9.6
The solution is tested on Pygame 2.3.0 version.

Using this solution, we are able to move a sprite in response to keyboard events in PyGame.

This process also facilities an easy to use, hassle free method to create a hands-on working version of code which would help us to move a sprite in response to keyboard events in PyGame.

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