Book Image

Raspberry Pi for Python Programmers Cookbook - Second Edition

Book Image

Raspberry Pi for Python Programmers Cookbook - Second Edition

Overview of this book

Raspberry Pi cookbook for Python Programmers is a practical guide for getting the most out of this little computer. This book begins by guiding you through setting up the Raspberry Pi, performing tasks using Python 3 and introduces the first steps to interface with electronics. As you work through each chapter you will build up your skills and knowledge and apply them as you progress throughout the book, delving further and further into the unique abilities and features of the Raspberry Pi. Later, you will learn how to automate tasks by accessing files, build applications using the popular Tkinter library and create games by controlling graphics on screen. You will harness the power of the built-in graphics processor by using Pi3D to generate your own high quality 3D graphics and environments. Connect directly to the Raspberry Pi’s hardware pins to control electronics from switching on LEDs and responding to push buttons right through to driving motors and servos. Learn how to monitor sensors to gather real life data and to use it to control other devices, and view the results over the Internet. Apply what you have learnt by creating your own Pi-Rover or Pi-Hexipod robots. Finally, we will explore using many of the purpose built add-ons available for the Raspberry Pi, as well as interfacing with common household devices in new ways.
Table of Contents (18 chapters)
Raspberry Pi for Python Programmers Cookbook - Second Edition
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Hardware and Software List
Index

Creating a bat and ball game


A classic bat and ball game can be created using the drawing tools of canvas and by detecting the collisions of the objects. The user will be able to control the green paddle using the left and right cursor keys to aim the ball at the bricks and hit them until they have all been destroyed.

Control the bat to aim the ball at the bricks

Getting ready

This example requires graphical output, so you must have a screen and keyboard attached to the Raspberry Pi or use X11 Forwarding and X server if connected remotely from another computer.

How to do it…

Create the following script, bouncingball.py.

  1. First, import the tkinter and time modules, and define constants for the game graphics:

    #!/usr/bin/python3
    # bouncingball.py
    import tkinter as TK
    import time
    
    VERT,HOREZ=0,1
    xTOP,yTOP = 0,1
    xBTM,yBTM = 2,3
    MAX_WIDTH,MAX_HEIGHT = 640,480
    xSTART,ySTART = 100,200
    BALL_SIZE=20
    RUNNING=True
  2. Next, create functions for closing the program, moving the paddle right and left, and for calculating...