![]() We will also apply the bouncing algorithm to check if it needs to bounce against any of the four walls. (See lines 33 to 36) We will add this object to the all_sprites_list group of sprites. (See line 5) We will then create an object called ball using the Ball class. In the main.py file, we will first import the Ball class. # Fetch the rectangle object that has the dimensions of the image. # Set the background color and set it to be transparent # Pass in the color of the ball, its width and height. # Call the parent class (Sprite) constructor It derives from the "Sprite" class in Pygame.ĭef _init_(self, color, width, height): It moves (changes the (x,y) coordinates of) the ball using its velocity vector. The update() method of this class will be called for each frame of the main program loop. You will need to copy this code in a new Python file called ball.py. Let’s investigate how the velocity vector is affected when the sprite bounces against vertical and horizontal walls/edges.īelow is the code for the Ball class. frame n+1: Sprite Coordinates: (x+Vx,y+Vy)Īs the sprite moves across the screen, it may need to bounce against another sprite or against the edge of the screen.Moving sprites are positionned using (x,y) coordinates and have a velocity vector (Vx,Vy) which specifies the delta in pixels to apply to the (x,y) coordinates of a sprite between two frames: Arcade games are based on a frame based animation where the screen is refreshed every x milliseconds. To understand how to implement a bouncing algorithm, it is essential to understand how the computer controls the trajectory of a sprite (e.g. To do so we will create a new class called Ball. Our aim is to add the bouncing ball to our Breakout game. ![]() ![]() Breakout Tutorial 5: Adding a Brick Wall.Breakout Tutorial 4: Adding a Bouncing Ball.Breakout Tutorial 3: Controlling the Paddle.This tutorial is the second tutorial in a series of five Pygame tutorials: ![]()
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