How to Create a JavaScript Radar Chart

Radar charts, which are also referred to as spider charts or radar plots, are a data visualization used to compare observations with multiple quantitative variables. Each variable is encoded to a spoke which are equidistant apart. The higher the value, the further away from the center of the chart the point is made. Radar charts are best used to compare the ‘profile’ of observations and to detect outliers within the data. They are therefore used quite a bit in sports, most notably in basketball and soccer for profiling players.

In this tutorial I will be teaching you how to build your own radar chart with JavaScript and how to use them to help with one of the toughest decisions in gaming history: which starting pokemon to choose!

That’s right, we will be building radar charts to perform data analysis on Bulbasaur, Charmander and Squirtle to determine, once and for all, which is the best choice.

Building a JavaScript radar chart

To build our radar charts we will be using a charting library. Charting libraries remove a lot of the burden of building charts (compared to something like d3.js) and allow you to get a chart up quickly and easily. For this tutorial I’ve chosen to use AnyChart JavaScript library. I’ve chosen AnyChart because building charts with it is really quick and it’s a awesome library for beginners because of the pretty intensive documentation.

Step 1: Setup the page

The first step to create our radar charts is to setup the html page and load the required scripts.

<html>
  <head>
    <script src="https://cdn.anychart.com/releases/8.7.1/js/anychart-core.min.js"></script>
    <script src="https://cdn.anychart.com/releases/8.7.1/js/anychart-radar.min.js"></script>
    <style type="text/css">
      html, body, #container {
        width: 100%;
        height: 100%;
        margin: 0;
        padding: 0;
      }
    </style>
  </head>
  <body>
    <div id="container"></div>
    <script>
      anychart.onDocumentReady(function () {
        // drawing our chart goes here
      });
    </script>
  </body>
</html>

All I have done here is created a new html page, added the scripts required for creating a radar chart anychart-core.min.js and anychart-radar.min.js. The former is required for all AnyChart charting and comes with the basic charts (scatter, bar etc) while the latter gives us the module required for building a radar chart.

We then create a CSS rule for our html page which sets the size of our chart. We have gone for 100% width and height and 0 margins to create a full screen data viz but if you want something different go ahead and change those values to something that better suits your needs.

Lastly, we use anychart.onDocumentReady(). Our chart will go in this function. What this does is it triggers the function only when the document is ready and not before.

Step 2: Load the data

In order to draw radar charts for our starter Pokemon we need to get the data. I found this at bulbapedia.bulbagarden.net (how cute?) which seems to have the stats for every Pokemon ever!

Image for post

We then need to reformat this data into something that AnyChart knows how to read. AnyChart likes the data for each observation in the following format:

var data1 = [
  {x: "HP", value: 39},
  {x: "Attack", value: 52},
  {x: "Defense", value: 43},
  {x: "Special Attack", value: 60},
  {x: "Special Defense", value: 50},
  {x: "Speed", value: 65},
];

An array of objects with each variable having the x-axis variable to be named ‘x’ and the y-axis variable to be named ‘value’. In the radar chart’s case, the x-axis variable is the name of the variable while the y-axis variable is the value.

We repeat this step for each starter Pokemon resulting in the following three arrays:

var data1 = [
  {x: "HP", value: 39},
  {x: "Attack", value: 52},
  {x: "Defense", value: 43},
  {x: "Special Attack", value: 60},
  {x: "Special Defense", value: 50},
  {x: "Speed", value: 65},
];

var data2 = [
  {x: "HP", value: 45},
  {x: "Attack", value: 49},
  {x: "Defense", value: 49},
  {x: "Special Attack", value: 65},
  {x: "Special Defense", value: 65},
  {x: "Speed", value: 45},
]; 

var data3 = [
  {x: "HP", value: 44},
  {x: "Attack", value: 48},
  {x: "Defense", value: 65},
  {x: "Special Attack", value: 50},
  {x: "Special Defense", value: 64},
  {x: "Speed", value: 43},
];

Step 3: Drawing the chart

Now that we have all of our (psy)ducks in a row it is time to draw our chart.

// create radar chart
var chart = anychart.radar();

// set chart title
chart.title("Starter Pokemon Comparison Chart");
// set chart yScale settings
chart.yScale()
  .minimum(0)
  .maximum(100)
  .ticks({'interval':20});
// create first series
chart.line(data1)
// create second series
chart.line(data2)
// create third series
chart.line(data3)
// set container id for the chart
chart.container('container');
// initiate chart drawing
chart.draw();

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What is GEEK

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How to Create a JavaScript Radar Chart

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What is JavaScript - Stackfindover - Blog

Who invented JavaScript, how it works, as we have given information about Programming language in our previous article ( What is PHP ), but today we will talk about what is JavaScript, why JavaScript is used The Answers to all such questions and much other information about JavaScript, you are going to get here today. Hope this information will work for you.

Who invented JavaScript?

JavaScript language was invented by Brendan Eich in 1995. JavaScript is inspired by Java Programming Language. The first name of JavaScript was Mocha which was named by Marc Andreessen, Marc Andreessen is the founder of Netscape and in the same year Mocha was renamed LiveScript, and later in December 1995, it was renamed JavaScript which is still in trend.

What is JavaScript?

JavaScript is a client-side scripting language used with HTML (Hypertext Markup Language). JavaScript is an Interpreted / Oriented language called JS in programming language JavaScript code can be run on any normal web browser. To run the code of JavaScript, we have to enable JavaScript of Web Browser. But some web browsers already have JavaScript enabled.

Today almost all websites are using it as web technology, mind is that there is maximum scope in JavaScript in the coming time, so if you want to become a programmer, then you can be very beneficial to learn JavaScript.

JavaScript Hello World Program

In JavaScript, ‘document.write‘ is used to represent a string on a browser.

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	document.write("Hello World!");
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How to comment JavaScript code?

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<script type="text/javascript">

//single line comment

/* document.write("Hello"); */

</script>

Advantages and Disadvantages of JavaScript

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In this video I will tell you How to create a calculator using javascript very easily.

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Visualizing data with NGX-Charts in Angular

Data Science, Data Analytics, Big Data, these are the buzz words of today’s world. A huge amount of data is being generated and analyzed every day. So communicating the insights from that data becomes crucial. Charts help visualize the data and communicate the result of the analysis with charts, it becomes easy to understand the data.

There are a lot of libraries for angular that can be used to build charts. In this blog, we will look at one such library, NGX-Charts. We will see how to use it in angular and how to build data visualizations.

What we will cover:

  1. Installing ngx-chart.

  2. Building a vertical bar graph.

  3. Building a pie chart.

  4. Building an advanced pie chart.

A brief introduction about NGX-Charts

NGX-Chart charting framework for angular2+. It’s open-source and maintained by Swimlane.

NGX-Charts does not merely wrap d3, nor any other chart engine for that matter. It is using Angular to render and animate the SVG elements with all of its binding and speed goodness and uses d3 for the excellent math functions, scales, axis and shape generators, etc. By having Angular do all of the renderings it opens us up to endless possibilities the Angular platform provides such as AoT, Universal, etc.

NGX-Charts supports various chart types like bar charts, line charts, area charts, pie charts, bubble charts, doughnut charts, gauge charts, heatmap, treemap, and number cards.

Installation and Setup

1. Install the ngx-chart package in your angular app.

npm install @swimlane/ngx-charts --save

2. At the time of installing or when you serve your application is you get an error:

ERROR in The target entry-point "@swimlane/ngx-charts" has missing dependencies: - @angular/cdk/portal

You also need to install angular/cdk

npm install @angular/cdk --save

3. Import NgxChartsModule from ‘ngx-charts’ in AppModule

4. NgxChartModule also requires BrowserAnimationModule. Import is inAppModule.

app.module.ts

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';
import { NgxChartsModule }from '@swimlane/ngx-charts';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    BrowserAnimationsModule,
    NgxChartsModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

Amazing! Now we can start using ngx-chart component and build the graph we want.

In the AppComponent we will provide data that the chart will represent. It’s a sample data for vehicles on the road survey.

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