I’m not quite sure how long I’ve been ignoring the Google Chart API but I saw it in a post the other day which reminded me, or at least gave me the inkling, that I had seen some discussion of it before.

Well, that was several days ago and I finally had some time to play with it and in a couple of hours created the following bullet chart:

So here’s the challange

1. Create a Better Bullet Chart than the Above
2. Create a Sparkline
3. Create a Square Pie Chart

Using the Google Chart API of course.

Once you’ve created your solution, post a link to it here in the comments. For the solutions that we like best, I’ll ask the author to provide a description and instructions to be published here in a follow up post.

Update: 12/15/2007

Jeff Donnici sends us two sparkline examples.

Simple:

With Banded Background:

Update 12/19/2007

Well with only Jeff taking up the challenge after 10 days, here’s the final solution: a so-called square-pie chart. Of the 3 types this is the most poorly supported by the Google API mostly because on bar charts you cannot control the scale of the axes.

Update Feb 29, 2008

Geoff offers us this austere Bullet Chart solution:

And this slightly "dressed up" version: