Raspberry Pi LED Blueprints by Agus Kurniawan

Author:Agus Kurniawan
Language: eng
Format: epub
Publisher: Packt Publishing

Here is the explanation:

First, define the initial position and speed

Set the ball speed vx = 1 and vy = 2

A ball moves by adding its position to the current position with vx and vy

Define the draw_ball() function to draw a ball on the 8 x 8 dot matrix display based on the current position of ball

Since the 8 x 8 LED dot matrix display has eight points, we should validate the pos_x and pos_y values with the following validation:

if pos_x >= 7: direction = -1 if pos_x <= 0: direction = 1

This code uses global variables. You can read another approach to use local variables for pos_x, pos_y, last_x, and last_y. Please open the ch04_o4b.py file.

Save this code. Execute the program by typing the following command:

sudo python ch04_04.py

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