You are previewing Supercharged JavaScript Graphics.

Supercharged JavaScript Graphics

Cover of Supercharged JavaScript Graphics by Raffaele Cecco Published by O'Reilly Media, Inc.
  1. Supercharged JavaScript Graphics
    1. SPECIAL OFFER: Upgrade this ebook with O’Reilly
    2. Preface
      1. Audience and Assumptions
      2. Organization
      3. Conventions Used in This Book
      4. Using Code Examples
      5. Safari® Books Online
      6. How to Contact Us
      7. Acknowledgments
    3. 1. Code Reuse and Optimization
      1. Keeping It Fast
      2. What and When to Optimize
      3. Homespun Code Profiling
      4. Optimizing JavaScript
      5. Optimizing jQuery and DOM Interaction
      6. Other Resources
    4. 2. DHTML Essentials
      1. Creating DHTML Sprites
      2. Converting into a jQuery Plug-in
      3. Timers, Speed, and Frame Rate
      4. Internet Explorer 6 Background Image Caching
    5. 3. Scrolling
      1. CSS-Only Scrolling Effects
      2. Scrolling with JavaScript
    6. 4. Advanced UI
      1. HTML5 Forms
      2. Using JavaScript UI Libraries
      3. Creating UI Elements from Scratch
    7. 5. Introduction to JavaScript Games
      1. Game Objects Overview
      2. The Game Code
    8. 6. HTML5 Canvas
      1. Canvas Support
      2. Bitmaps, Vectors, or Both?
      3. Canvas Limitations
      4. Canvas Versus SVG
      5. Canvas Versus Adobe Flash
      6. Canvas Exporters
      7. Canvas Drawing Basics
      8. Animating with Canvas
      9. Canvas and Recursive Drawing
      10. Replacing DHTML Sprites with Canvas Sprites
      11. A Graphical Chat Application with Canvas and WebSockets
    9. 7. Vectors for Games and Simulations
      1. Operations on Vectors
      2. Creating a JavaScript Vector Object
      3. A Cannon Simulation Using Vectors
      4. Rocket Simulation
    10. 8. Google Visualizations
      1. Limitations
      2. Chart Glossary
      3. Image Charts
      4. Interactive Charts
    11. 9. Reaching the Small Screen with jQuery Mobile
      1. jQuery Mobile
      2. TilePic: A Mobile-Friendly Web Application
      3. PhoneGap
    12. 10. Creating Android Apps with PhoneGap
      1. Installing PhoneGap
      2. Creating a PhoneGap Project in Eclipse
    13. Index
    14. About the Author
    15. Colophon
    16. SPECIAL OFFER: Upgrade this ebook with O’Reilly

Interactive Charts

In contrast to image charts, which (as their name implies) are displayed as regular images, interactive charts are composed of dynamic graphics that are drawn using various browser facilities such as DHTML, Flash, Canvas, SVG, and VML. Typical interactivity includes scrolling, zooming, sorting, tool tips, and hover effects.

The drawing method employed is mostly transparent to the developer, as a well-written visualization will use the appropriate rendering method for the target browser. This is a great time-saver, allowing the developer to concentrate on the functionality and aesthetics of the charts rather than the minutiae of drawing them.

Interactive charts require the use of an external API, which you would typically include in the <head> section of your page, as with any other external library:

 <script type="text/javascript" src=""></script>

The stages required to draw a chart using the visualizations API are as follows:

  1. Load the general Google AJAX API.

  2. Request the appropriate visualizations API.

  3. When the visualizations API has loaded, prepare the data, and finally draw the chart into an element on the page.

The following code draws a chart using the same bakery sales data used earlier in the chapter:

<html> <head> <!-- Load the general Google AJAX API --> <script type="text/javascript" src=""> </script> <script type="text/javascript"> // Load the visualization API, using the 'corechart' package within it. ...

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