Chapter Twelve. Charts with Html5 Canvas
Presenting complex data graphically—as a pie, line, area, or bar chart—is a powerful way to convey information and illuminate patterns and trends that would be much harder to spot poring over large tables of numbers. More and more on the web, we see charts and graphs used to deliver key information, including:
• Comparisons of statistical numbers or percentages, like voting or opinion poll results
• Tracking simple activity or performance information over time, like the number of users accessing a website, instances of news stories about a topic, or stock share prices
• Displays of complex financial or scientific trend data with moving averages, minimum and maximum values visualized to correlations, and ...
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