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

Dragging and dropping

In this recipe, we'll tackle the drag and drop event listeners. Without the Events class or some other lightweight JavaScript library, drag-and-drop operations can be quite cumbersome to develop. We can use mouseover, mousedown, mousemove, mouseup, and mouseout event listener to handle different phases of the drag-and-drop operation. In this recipe, we use mousedown, mouseup, and mousemove. That's what we require for drag and drop. The output is as follows:

How to do it

The recipe is as follows:

The HTML code:

<title>Canvas Drag and Drop</title>
<script src="dragdrop.js"></script>
<body onload=init()>

<canvas id="MyCanvasArea" width="400" height="300" style="border:2px solid blue;">
    Canvas tag is not supported by your browser
<h1>drag and drop the circle</h1>

The JavaScript code:

var can;
var ctx;
var x ...