Set up the game loop in pygame

Game loop

The game loop in pygame is the primary process for all threads of game delivery. It is present in all modern games and drives the installation process, internal update, rendering, AI, etc. The Game Loop in pygame pattern ensures that game time runs at the same speed throughout the various hardware settings. It remains active until the user wants to exit. 

The game loop mainly performs the following functions:

• Update our game window to display visible changes
• Update our game regions based on user input
• Manage different types of events
• Keep the game window running

A game loop in pygame is a while loop that has only one condition, which checks whether the boolean condition is true or not.

Setting up the game loop in pygame

Step 1: Declare the Boolean variable to be true, which will be used to test whether players want to continue playing our game or not.

keepGameRunning=true

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Step 2: Create a temporary loop and check our Boolean variables above whether they are true or not. If true, keep the loop running which suggests keeping our game loop running. During this time, the loop checks events, and if the event is over, then set the false variables above to exit our game loop and close our pygame window.

while keepGameRunning:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:  
           keepGameRunning = False

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Implementation of the above steps

In the code below, we create a simple game loop that makes a pygame window and checks if the event type has stopped, and if it is true, then leave the game.

import pygame
pygame.init()

# Creating window
gameWindow = pygame.display.set_mode((1200, 500))
pygame.display.set_caption("coding ninjas")

# Game specific variables
exit_game = False
game_over = False

# Creating a game loop
while not exit_game:
    pass

pygame.quit()
quit()

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Output:

We have added another function to our game loop in the code below to update our screen on each loop. Here we change the background color of each loop by updating our screen on each loop.

#getting pygame and another library we need for setup
import pygame, sys

#setup(for starting the pygame i'm pretty sure)
pygame.init()

#making the screen
width = 400
height = 400
screen=pygame.display.set_mode((width,height))
pygame.display.set_caption("coding ninjas")

#this is the color I want to use, you can change with different color using a different tutorial
backGroundColor=pygame.Color("LIGHTBLUE")

#to make the background always work
start = True

# setting variable to storecolor
color = "grey"

# keep game running till running is true
while start:

# Check for event if user has pushed
# any event in queue
for event in pygame.event.get():

# if event is of type quit then set
# running bool to false
if event.type == pygame.QUIT:
start = False

# set background color to our window
screen.fill(color)

# Update our window
pygame.display.flip()

# if color is red change it to green and
# vice-versa
if(color == "grey"):
color = "pink"

else:
color = "grey"

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Output:

Check out this problem - Optimal Strategy For A Game

FAQs

Why is python used?

Python is a general-purpose computer programming language commonly used to build websites and software, perform tasks automatically, and perform data analysis. Python is a common target language, which means it can be used to construct different programs and is not unique for any specific problems.

Why is python mainly used for making games?

The pygame is the excellent Python framework for game creation among all these frames. It included many computer graphics and libraries and was developed by the PyGame community. Python is now an excellent and common programming language and is ready to test prototyping and debugging tools.

Can we say that python is the best in graphics?

Python is a good language for graphics processes if you need to uninstall the program quickly and do not worry about encoding individual keys. However, if you need processing power and high FPS, it is best to look at other languages.

Conclusion 

In this article, we have extensively discussed how to set up the game loop in pygame using functions. We started with a brief introduction to game loop and pygame and in the end, we concluded the blog by setting up the game loop in pygame.

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