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Canvas Cookbook

You're reading from   Canvas Cookbook Over 80 simple but creative and structured recipes to explore the capabilities of HTML5 Canvas

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Product type Paperback
Published in May 2019
Publisher
ISBN-13 9781785284892
Length 254 pages
Edition 1st Edition
Languages
Tools
Concepts
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Toc

Table of Contents (11) Chapters Close

Preface 1. Paths and Text FREE CHAPTER 2. Shapes and Composites 3. Animation 4. Images and Videos 5. Interactivity through Events 6. Creating Graphs and Charts 7. 3D Modeling 8. Game Development 9. Interoperability and Deployment Index

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:

<html>
<head>
  <title>Event Handling example</title>
  <script src="CarMoves.js"></script>
</head>
<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
  </canvas>
</body>
</html>

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");

  xPos=can.width/2;
  yPos=can.height/2;
  carimage=new Image();
  carimage.src='carTopView...
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