Book Image

Canvas Cookbook

Book Image

Canvas Cookbook

Overview of this book

With the growing popularity of HTML5 Canvas, this book offers tailored recipes to help you develop portable applications, presentations, and games. The recipes are simple yet creative and build on each other. At every step, the book inspires the reader to develop his/her own recipe. From basic to advanced, every aspect of Canvas API has been covered to guide readers to develop their own application, presentation, or game.
Table of Contents (16 chapters)
Canvas Cookbook
About the Author
About the Reviewer

Simulating car movements

This is a very crude recipe to introduce key events. It is a recipe that just gives you a fair idea of how the movements of objects can occur on a key press, which is very useful for gaming. The output is as follows:

How to do it

The recipe is as follows:

The HTML code:

  <title>Event Handling example</title>
  <script src="CarMoves.js"></script>
<body onload=init()>
  <canvas width="800" height="800" id="MyCanvasArea" style="border:2px solid blue;" tabindex="0">
    Canvas tag is not supported by your browser

The JavaScript code:

var ctx;
var can;
var xPos;
var yPos;
var rot;
var carimage;
var TO_RADIANS = Math.PI/180;
function init(){
  can = document.getElementById("MyCanvasArea");
  can.addEventListener('keydown', doKeyDown, true);
  ctx = can.getContext("2d");

  carimage=new Image();