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

Working with mouse coordinates

This recipe captures one of the mouse events, mousedown, to find which coordinates on the canvas have been clicked. Here is the output:

How to do it

The recipe is as follows:

The HTML code is as follows:

  <title>Mouse Coordinates example</title>
  <script src="mouseCoords.js"></script>
<body onload=init()>
  <canvas width="400" height="400" id="MyCanvasArea" style="border:2px solid blue;">
    Canvas tag is not supported by your browser
  <h1>click on the canvas</h1>

The JavaScript code is as follows:

var ctx;
var can;
function init()
function doMouseDown(event)
  alert("X=" + xPos + "Y=" + yPos);

How it works...

In this example, the focus is on...