Book Image

HTML5 Canvas Cookbook

By : Eric Rowell
Book Image

HTML5 Canvas Cookbook

By: Eric Rowell

Overview of this book

The HTML5 canvas is revolutionizing graphics and visualizations on the Web. Powered by JavaScript, the HTML5 Canvas API enables web developers to create visualizations and animations right in the browser without Flash. Although the HTML5 Canvas is quickly becoming the standard for online graphics and interactivity, many developers fail to exercise all of the features that this powerful technology has to offer.The HTML5 Canvas Cookbook begins by covering the basics of the HTML5 Canvas API and then progresses by providing advanced techniques for handling features not directly supported by the API such as animation and canvas interactivity. It winds up by providing detailed templates for a few of the most common HTML5 canvas applications—data visualization, game development, and 3D modeling. It will acquaint you with interesting topics such as fractals, animation, physics, color models, and matrix mathematics. By the end of this book, you will have a solid understanding of the HTML5 Canvas API and a toolbox of techniques for creating any type of HTML5 Canvas application, limited only by the extent of your imagination.
Table of Contents (19 chapters)
HTML5 Canvas Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Canvas Security
Index

Creating level images and boundary maps


Now that we have sprite sheets for the hero and the bad guys, it's time to create a virtual world for them to live in. In Canvas Hero, our virtual world will be a single level that moves left and right as the player moves through it, which will contain walls, a ceiling, a floor, platforms, and holes. In this recipe, we'll go over the steps for making a level image as well as a boundary map image that graphically contains information about the bounds of the level and also identifies special zones with different colors.

How to do it...

To create the level image for Canvas Hero, we can use some prebuilt graphics downloaded from http://www.spriters-resource.com and add in new platforms, holes, and levitators using Photoshop, Gimp, or some other image editor of your choice. To keep the level somewhat small in size, we can create a foreground level image that's 6944 x 600 px. The canvas, which is 900 x 600 px, will act as a viewing window to the level. Here...