These libraries don’t use images to represent images; instead they use HTML 5 canvas to create circular form of graph.
gRaphaël’s goal is to help you create stunning charts on your website. It is based on Raphaël graphics library. gRaphaël currently supports Firefox 3.0+, Safari 3.0+, Opera 9.5+ and Internet Explorer 6.0+.
ECharts is a comprehensive charting library offering a painless way of adding interactive charts to your products. ECharts currently supports line, column, scatter, pie, radar, candlestick, chord, gauge, funnel, map and force-directed chart types, many of these can be combined in one chart.
This library takes your parameters and displays a circle donut (in flat style). The displaying is performed by writing an SVG graphic into a provided DIV element. Changing values of the circle leads to a smooth animation that can also be triggered if the scrolling position is fully showing the circle.
Chart.js is an easy, object oriented client side graphs for designers and developers. You can visualise your data in 6 different ways. Each of them animated, fully customizable and look great, even on retina displays. Chart.js uses the HTML5 canvas element. It supports all modern browsers, and polyfills provide support for IE7/8.