GWT Google Charts - Overview

Google Charts is a pure JavaScript based charting library meant to enhance web applications by adding interactive charting capability. It supports a wide range of charts. Charts are drawn using SVG in standard browsers like Chrome, Firefox, Safari, Internet Explorer(IE). In legacy IE 6, VML is used to draw the graphics.

Google Chart Java Module is a open source java based library to provides an elegant and feature rich Google Charts visualizations within a GWT application and can be used along with GWT widget libraries. There are chapters discussing all the basic components of Google Charts with suitable examples within a GWT application.

Features

Following are the salient features of Google Charts library.

• Compatability − Works seemlessly on all major browsers and mobile platforms like android and iOS.
• Multitouch Support − Supports multitouch on touch screen based platforms like android and iOS. Ideal for iPhone/iPad and android based smart phones/ tablets.
• Free to Use − Open source and is free to use for non-commercial purpose.
• Lightweight − loader.js core library, is extremely lightweight library.
• Simple Configurations − Uses json to define various configuration of the charts and very easy to learn and use.
• Dynamic − Allows to modify chart even after chart generation.
• Multiple axes − Not restricted to x, y axis. Supports multiple axis on the charts.
• Configurable tooltips − Tooltip comes when a user hover over any point on a charts. googlecharts provides tooltip inbuilt formatter or callback formatter to control the tooltip programmatically.
• DateTime support − Handle date time specially. Provides numerous inbuilt controls over date wise categories.
• Print − Print chart using web page.
• External data − Supports loading data dynamically from server. Provides control over data using callback functions.
• Text Rotation − Supports rotation of labels in any direction.

Supported Chart Types

Google Charts library provides following types of charts −

Sr. No.	Chart Type / Description
1	Line Charts Used to draw line/spline based charts.
2	Area Charts Used to draw area wise charts.
3	Pie Charts Used to draw pie charts.
4	Sankey Charts, Scatter Charts, Stepped area charts, Table, Timelines, TreeMap, Trendlines Used to draw scattered charts.
5	Bubble Charts Used to draw bubble based charts.
6	Dynamic Charts Used to draw dynamic charts where user can modify charts.
7	Combinations Used to draw combinations of variety of charts.
8	3D Charts Used to draw 3D charts.
9	Angular Gauges Used to draw speedometer type charts.
10	Heat Maps Used to draw heat maps.
11	Tree Maps Used to draw tree maps.

In next chapters, we're going to discuss each type of above mentioned charts in details with examples.

Licence

Google Charts is open source and is free to use. Follow the link: Terms of Service.