Book Image

Sencha Charts Essentials

By : Ajit Kumar
Book Image

Sencha Charts Essentials

By: Ajit Kumar

Overview of this book

Table of Contents (16 chapters)
Sencha Charts Essentials
About the Author
About the Reviewers

A walkthrough of a polar chart – radar

The radar series is rendered using the polar chart as it works with the polar coordinate system. It uses the radial and angular axes to determine the position of a point. The following diagram depicts Radar where we have marked different areas, such as the axis, legend, series, and sprite:

In the preceding diagram, the Radar series is used with two axes:

  • The numeric axis along the radius to show the browser usage data

  • The category axis along the angular direction to show the month

The following diagram shows the different classes involved in the construction and initialization of a chart with the Radar series and the control flow:

This is similar to the CandleStick series that we saw earlier, except that in place of CartesianChart, PolarChart is used and in place of the CandleStick series (and related sprites), the Radar series' (and related sprites) classes are used.

When it comes to rendering a polar chart, again, the steps are consistent with that of a...