Converting a spline chart to a polar/radar chart

Polar (or radar) charts are generally used to spot data trends. They have a few differences from line and column type charts. Even though they may look like pie charts, they have nothing in common with them. In fact, a polar chart is a round representation of the conventional two-dimensional charts. To visualize it another way, it is a folded line or a column chart placed in a circular way with both ends of the x axis meeting.

Again, we need to include highcharts-more.js in order to plot a polar chart. The following screenshot illustrates the structure of a polar chart:

There are very few differences in principle, and the same also applies to the Highcharts configuration. Let's use our very first example of a browser usage chart in Chapter 1, Web Charts, and turn it into a radar chart. Recalling the browser line chart, we made the following:

To turn the line chart into a polar chart, we only need to set the chart.polar option to true, which transforms...