Introduction to pygame

Pygame is a set of Python modules designed for writing video games. It adds functionality on top of the excellent SDL library, enabling you to create fully-featured games and multimedia programs in the Python language. It's key benefits include:

• Beginner-Friendly: Simple Python syntax makes it ideal for newcomers.
• Active Community: Rich with tutorials, examples and global support.
• Cross-Platform: Works on Windows, Mac and Linux.
• Versatile: Suitable for games, simulations and interactive apps.
• Free & Open Source: No cost, no restrictions.

Installing Pygame

Pygame requires Python 3.6.1 or later, as newer versions are more beginner-friendly and offer improved performance. If you don’t have Python installed, download it from python.org.

To install Pygame, use the following command:

python3 -m pip install -U pygame --user

After installation, verify if it works by running a built-in example:

python3 -m pygame.examples.aliens

If the game launches successfully, you are ready to start using Pygame!

Creating your first pygame program

Once Pygame is installed, let’s create a simple program that displays four squares on the screen.

Importing Pygame Modules

# Import the pygame module

import pygame

# Import constants for easier access to key events

from pygame.locals import *

Before using any Pygame functionality, we need to import its modules.

Understanding key pygame concepts

• Sprite: A 2D object (like our square) displayed on the screen.
• Surface: A canvas for drawing (even the screen is a Surface).
• Rect: A rectangle object for positioning and collisions.

Implementation code:

Output

Explanation:

• Sq class creates a 25x25 light blue square sprite in Pygame by extending pygame.sprite.Sprite, initializing the parent class, and filling the surface with color (0, 200, 255).
• pygame.event.get() handles all incoming events. If the event type is QUIT, the game exits when the window close button is clicked. Similarly, if a KEYDOWN event occurs and the Backspace key is pressed (e.key == pygame.K_BACKSPACE), the game will exit.
• win.blit(s1.surf, (40, 40)) draws square 1 at the top-left, s2 at the bottom-left, s3 at the top-right and s4 at the bottom-right.
• pygame.display.flip() updates the screen to show the drawn squares.

Catch the falling blocks mini game

Let’s create a simple, real game where a player-controlled paddle catches falling blocks. Its features include:

• Move the paddle left/right using the arrow keys.
• Catch falling blocks to earn points.
• Game Over if a block hits the ground.

Output

Explanation:

• pygame.Rect(...) used to define rectangular shapes like the paddle and block. The first two values are the top-left (x, y) position, followed by width and height.
• paddle.move_ip(x, y) moves the paddle in-place by given values.
• block.colliderect(paddle) checks for collision between block and paddle. If True, the block is "caught".
• score & b_speed score is increased by 1 on each catch and the block speed increases, making the game progressively harder.
• pygame.display.flip() updates the entire screen with any changes made e.g., moving paddle or falling block.
• clock.tick(60) keeps the game running at 60 frames per second for smooth movement.