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Home > Data > Data Visualization > Sencha Charts Essentials
Sencha Charts Essentials
Sencha Charts Essentials

Sencha Charts Essentials: Create stunning charts and visualizations for both web and mobile applications

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Sencha Charts Essentials

Chapter 2. Working with Out-of-the-box Charts

In the previous chapter, we saw how one can create a chart using the Sencha Charts Surface API. The only issue is that Surface is still a very low-level API providing drawing primitives, which can be used to create any drawing, including charts. We will have to write a lot of code to create a chart using these drawing primitives, handling events, resizing charts, data binding, theming, and so on.

In this chapter, we will move up in terms of API abstraction and look at the chart-related API, which we can use for visual presentation. In this chapter, you will learn the following topics:

  • Creating cartesian charts—line, bar, area charts
  • Creating polar charts—pie chart
  • Creating spacefilling charts—gauge chart
  • Theming your charts
  • Engaging users with gestures

Types of charts

Sencha Charts supports the following types of charts:

  • Cartesian charts: These charts are based on a two-dimensional coordinate system or the cartesian coordinate system. This is where the position of a point is determined based on its (x, y) coordinate. Typical examples are area charts, bar charts, and line charts.
  • Polar charts: These charts are based on the polar coordinate system. This is a two-dimensional coordinate system where the position of a point in the plane is determined based on its distance from a fixed point and angle from a fixed direction. Typical examples are Pie and Radar.
  • Spacefilling charts: These charts fill the entire space/area of the chart. For example, Treemap and Gauge.

The following screenshot shows the different types of Sencha Charts:

Types of charts

Anatomy of a chart

A chart has different areas. Each area has its own name. These names will act as the terminology that Sencha Charts will use and they will be used throughout this book. The following diagram depicts a cartesian chart created using Sencha Charts with its different areas:

Anatomy of a chart

Let's take a look at a few of the terminologies highlighted in the preceding figure:

  • Sprite: This is an object that is rendered on a drawing surface—Ext.draw.Surface—which we discussed in the previous chapter. Sencha Charts offers many different types of sprite, such as arc, circle, rectangle, path, and text, all of which are used internally to create different types of chart. They can also be added directly to a chart. In the preceding diagram, a text sprite is used to show the chart title.
  • Series: This class is very specific to the type of chart that we want to draw. For example, Sencha Charts uses area series to draw area charts, whereas bar series draw bar charts. Based on the samples...

Creating a cartesian chart

We will start by making a cartesian chart. A cartesian chart must have axes and a series along with the dataset:

  1. Create a project using Sencha Cmd with SCE as the application name.
  2. Edit the app/view/main/Main.js file and replace its contents with the following code to create a cartesian chart that shows quarterly sales and quarterly orders:
    Ext.define('SCE.view.main.Main', {
   extend: 'Ext.container.Container',

       xtype: 'app-main',
   
   layout: {
       type: 'fit'
   },

   items: [{
       xtype: 'cartesian',
       title: 'Chart',
       height: 500,
       width: 500,
       insetPadding: 40,
       legend: true,
       store: {
           fields: ['month', 'sales', 'order'],
           data: [
               { month: 'Q1', sales: 100, order: 20 },
               { month: 'Q2', sales: 250, order: 120 },
               { month:...

Creating a polar chart

Pie and Radar are out-of-the-box polar charts provided by Sencha Charts. These charts use the polar coordinate system to draw sprites. Pie series does not require an axes configuration. However, Radar series does require axes configuration, one radial and another angular.

Let's see how we create a polar chart with a pie series.

Create a project using Sencha Cmd with SCE as the application name. Edit the app/view/main/Main.js file and replace its contents with the following code:

Ext.define('SCE.view.main.Main', {
   extend: 'Ext.container.Container',

       xtype: 'app-main',
   
   layout: {
       type: 'fit'
   },

   items: [{
       xtype: 'polar',
       title: 'Chart',
       height: 500,
       width: 500,
       store: {
           fields: ['sample', 'value'],
           data: [
               { sample: '1', value: 100 },
               { sample: '2', value...

Creating a spacefilling chart

A spacefilling chart does not have a coordinate requirement. It occupies the available area with the chart. Treemap, heatmap, and gauge charts are some examples. Treemap and heatmap charts do not come with Sencha Charts. Gauges, however, does come along with it. Let's see how to use it in an application.

Create a project using Sencha Cmd with SCE as the application name. Edit the app/view/main/Main.js file and replace its contents with the following code:

Ext.define('SCE.view.main.Main', {
   extend: 'Ext.container.Container',

       xtype: 'app-main',
   
   layout: {
       type: 'fit'
   },

   items: {
       xtype: 'spacefilling',
       series: {
           type: 'gauge',
           minimum: 100,
           maximum: 800,
           value: 400,
           donut: 30,
           needle: true,
           colors: ['orange', 'blue']

       }
   }
});

The preceding code uses...

Types of charts

Sencha Charts supports the following types of charts:

  • Cartesian charts: These charts are based on a two-dimensional coordinate system or the cartesian coordinate system. This is where the position of a point is determined based on its (x, y) coordinate. Typical examples are area charts, bar charts, and line charts.

  • Polar charts: These charts are based on the polar coordinate system. This is a two-dimensional coordinate system where the position of a point in the plane is determined based on its distance from a fixed point and angle from a fixed direction. Typical examples are Pie and Radar.

  • Spacefilling charts: These charts fill the entire space/area of the chart. For example, Treemap and Gauge.

The following screenshot shows the different types of Sencha Charts:

Anatomy of a chart

A chart has different areas. Each area has its own name. These names will act as the terminology that Sencha Charts will use and they will be used throughout this book. The following diagram depicts a cartesian chart created using Sencha Charts with its different areas:

Let's take a look at a few of the terminologies highlighted in the preceding figure:

  • Sprite: This is an object that is rendered on a drawing surface—Ext.draw.Surface—which we discussed in the previous chapter. Sencha Charts offers many different types of sprite, such as arc, circle, rectangle, path, and text, all of which are used internally to create different types of chart. They can also be added directly to a chart. In the preceding diagram, a text sprite is used to show the chart title.

  • Series: This class is very specific to the type of chart that we want to draw. For example, Sencha Charts uses area series to draw area charts, whereas bar series draw bar charts. Based on the samples/data, the series...

Creating a cartesian chart

We will start by making a cartesian chart. A cartesian chart must have axes and a series along with the dataset:

  1. Create a project using Sencha Cmd with SCE as the application name.

  2. Edit the app/view/main/Main.js file and replace its contents with the following code to create a cartesian chart that shows quarterly sales and quarterly orders:

    Ext.define('SCE.view.main.Main', {
   extend: 'Ext.container.Container',

       xtype: 'app-main',
   
   layout: {
       type: 'fit'
   },

   items: [{
       xtype: 'cartesian',
       title: 'Chart',
       height: 500,
       width: 500,
       insetPadding: 40,
       legend: true,
       store: {
           fields: ['month', 'sales', 'order'],
           data: [
               { month: 'Q1', sales: 100, order: 20 },
               { month: 'Q2', sales: 250, order: 120 },
               { month: 'Q3', sales: 75, order: 40},
               { month: 'Q4', sales: 120, order: 25}
           ]
       },
       axes: [{
    ...
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Page 1 of 9

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Description

If you are an Ext JS or Sencha Touch developer, designer, or architect who wants to build enterprise-scale data visualization capabilities using Sencha, then this book is ideal for you. You should have a knowledge of HTML, JavaScript, CSS, and Sencha Ext JS or Sencha Touch fundamentals, in particular. Some familiarity with SVG and HTML5 Canvas would be preferred, but not required.

Who is this book for?

If you are an Ext JS or Sencha Touch developer, designer, or architect who wants to build enterprise-scale data visualization capabilities using Sencha, then this book is ideal for you. You should have a knowledge of HTML, JavaScript, CSS, and Sencha Ext JS or Sencha Touch fundamentals, in particular. Some familiarity with SVG and HTML5 Canvas would be preferred, but not required.

What you will learn

  • Set up and configure Sencha Charts and understand its extensibility capabilities
  • Create interactive HTML5 charts that are portable across the Web and touch/mobile
  • Deliver rich, professional, and engaging visualizations of complex, customized data including financial data, infographics, and so on
  • Understand the basic building blocks and the overall architecture of Sencha Charts
  • Get to grips with SVG and Canvas APIs to draw basic geometrical shapes
  • Create different types of charts, such as cartesian, polar, and spacefilling, in your application using outofbox charts from Sencha Charts
  • Compare Sencha Charts with other charting libraries/SDKs

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : May 30, 2015
Length: 214 pages
Edition : 1st
Language : English
ISBN-13 : 9781785288487
Category :
Data
Languages :
JavaScript
Concepts :
Data Visualization
Tools :
Sencha Touch

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Publication date : May 30, 2015
Length: 214 pages
Edition : 1st
Language : English
ISBN-13 : 9781785288487
Category :
Data
Languages :
JavaScript
Concepts :
Data Visualization
Tools :
Sencha Touch

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Sencha Charts Essentials
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Table of Contents

10 Chapters
1. Fundamentals of Sencha Charts Chevron down icon Chevron up icon
1. Fundamentals of Sencha Charts
Introducing the sample chart
Sencha Charts Surface API
Summary
2. Working with Out-of-the-box Charts Chevron down icon Chevron up icon
2. Working with Out-of-the-box Charts
Types of charts
Anatomy of a chart
Creating a cartesian chart
Creating a polar chart
Creating a spacefilling chart
Theming your chart
Engaging users with gestures
Summary
3. Sencha Charts Architecture Chevron down icon Chevron up icon
3. Sencha Charts Architecture
Architecture of Sencha Charts
A walkthrough of an existing CandleStick chart
A walkthrough of a polar chart – radar
A walkthrough of a spacefilling chart – gauge
Summary
4. Creating a Custom Cartesian Chart Chevron down icon Chevron up icon
4. Creating a Custom Cartesian Chart
Creating a new financial chart
Summary
5. Creating a Custom Polar Chart Chevron down icon Chevron up icon
5. Creating a Custom Polar Chart
Creating a Market Clock
Summary
6. Creating a Custom Spacefilling Chart Chevron down icon Chevron up icon
6. Creating a Custom Spacefilling Chart
Creating a periodic table
Summary
7. Theming Chevron down icon Chevron up icon
7. Theming
Getting ready
Styling using configs
Theming using a custom theme
Theming using SASS and CSS
Summary
8. Working with Touch Gestures Chevron down icon Chevron up icon
8. Working with Touch Gestures
Interacting with interactions
Using built-in interactions
Creating custom interactions
Summary
9. Comparison with Other JavaScript Charting Libraries Chevron down icon Chevron up icon
9. Comparison with Other JavaScript Charting Libraries
Google Charts
FusionCharts
amCharts
HighCharts
Summary
Index Chevron down icon Chevron up icon
Index

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Philip Arad Sep 02, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
If you are an Ext JS or Sencha Touch developer who wants to build enterprise-scale data visualization using Sencha, this book is ideal for you.Sencha Charts is a new and powerful library used to create rich and beautiful charts for your Mobile Sencha Touch and Ext JS applications. Built in HTML5, Sencha Charts is optimized for performance and fully support gestures and touch devices on mobile, thus making visualizing data effortless.With your knowledge of HTML, JavaScript, CSS, and Sencha Ext JS or Sencha Touch fundamentals, you will be able to upgrade your application on desktop and mobile, to meet enterprise standard.First in the book, you will get familiar with charting fundamentals and then engage with the Sencha Charts architecture. You will then learn how to use out-of-the-box charts, and then create your own custom Cartesian, polar, and space filling charts to visualize your own data.Finally, you will see how Sencha Charts compares with other charting libraries for all your data expression needs.During your studies you will discover out-of-the-box enterprise visualizations, develop your own custom charts and learn to make your charts work on desktop and touch-sensitive devicesYou will create interactive HTML5 charts that are portable across the Web and touch/mobile and deliver rich, professional, and engaging visualizations of complex, customized data including financial data, infographics, and so on.
Amazon Verified review Amazon

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About the author

Profile icon Ajit Kumar
Ajit Kumar
Ajit Kumar has over 16 years of experience in technology areas ranging from embedded systems to large enterprise applications. He worked with various multinational corporations such as Honeywell, Hughes, Virtusa, and Convergys, before starting his own companyWalking Treewhich specializes in Sencha frameworks. Ajit has authored books on open source frameworks, including Sencha Touch Cookbook, Sencha Touch Cookbook Second Edition, Sencha MVC Architecture, and ADempiere 3.6 Cookbook, all by Packt Publishing, which he considers his way of thanking the awesome open source community!
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