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how to create a pie chart in chart js

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by chandramouliprabuoff dot icon Updated: Jan 4, 2024

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Guide Kit Guide Kit  

A pie chart is a circular statistical graphic. To illustrate numerical proportions, divide it into slices. In data visualization, the goal is to show the spread and compare it to its parts.

History and Evolution:

The concept of pie charts dates to the 18th century. the evolving from early efforts to represent data. Today, they play a vital role in data analysis. Modern tools like Chart.js and Google Charts install them.

Data Representation:

Pie charts are versatile, representing various data types like percentages, proportions, and ratios. They offer a concise way to communicate. the relationship between different components within a dataset.

Key Elements:

Title: A pie chart should have a clear, informative title indicating the subject of the data.

Labels: We label each slice to identify its corresponding category.

Legend: A legend aids in interpreting the chart. These are associating colors with specific data elements.

Tips for Effectiveness:

- Color Selection: Choose an appealing color palette. ensures clarity in differentiating slices.

- Avoid Clutter: Limit the number of slices to maintain readability; too many can lead to confusion.

- Proper Scaling: Ensure accurate representation by using appropriate scales and avoiding distortion.

- Title Clarity: Craft a concise and descriptive title for immediate comprehension.

Doughnut Chart:

A doughnut chart, a variation of the pie chart, introduces a central hole. It offers extra space for annotations without compromising the visual impact.

Implementation:

To create a pie chart in Chart.js using HTML5, HTML Page, and HTMLfile. You can use JavaScript code for HTML5 Charts. Use the canvas element and chart labels. Customization options tailor the visual representation to specific needs.

Chart Types: Explore diverse chart types. it includes area charts,

• polar area charts,

• line graphs,

• bar charts,

• bubble charts.

Consider many axes for comprehensive data representation. Create a dynamic and engaging pie chart in Chart.js. It provides various styles and helper props. The source code utilizes a variable,"data,"connected to a data table. It presents multivariate data through a constant data structure. The graphical method employs line series and arc elements. It is enhanced with rotation animation for a dynamic visual experience. Additionally, explore a Stacked Bar approach and a radar chart. It represents data points. The code integrates the versatility of Chart.js. It allows you to install. customize these visualizations for insightful data representation.

In Conclusion, pie charts provide a concise. The intuitive way to represent data relationships. We use modern tools and libraries like Chart.js and Google Charts. Their application has become more dynamic.

Fig 1: Preview of the output that you will get on running this code from your IDE.

Code

Pie chart using chart.js

JavaScriptdotLines of Code : 25dotLicense : Strong Copyleft (CC BY-SA 4.0)

angular.module("app", ["chart.js"]).controller("ChartCtrl", function($scope) {

    $scope.labels = ["January", "February", "March", "April", "May", "June", "July"];
    
    $scope.data = [65, 59, 80, 81, 56, 55, 40];
    
    $scope.options = {
      pieceLabel: {
        render: 'label',
        fontColor: '#000',
        position: 'outside'
      }
    };
  
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.5.8/angular.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.2.1/Chart.js"></script>
<script src="https://cdn.jsdelivr.net/angular.chartjs/latest/angular-chart.js"></script>
<script src="https://rawgit.com/emn178/Chart.PieceLabel.js/master/build/Chart.PieceLabel.min.js"></script>

<div ng-app="app" ng-controller="ChartCtrl">
  <canvas id="pie" class="chart chart-pie"
         chart-data="data" chart-labels="labels" chart-options="options">
  </canvas> 
</div>

Instruction

  1. Install Visual Studio Code IDE on your computer.
  2. Create a new HTML file.
  3. Copy the code using the 'Copy' button and create an HTML tag then paste the code inside the tag into that HTML file.
  4. Copy the controller.js code and paste in the JS file created.
  5. Create a script tag inside the body tag Then keep the function lines inside the script tag(refer to preview as well).
  6. ⁠Add the script tag from line 1 to 15.
  7. Save and run the HTML file directly from the file location to generate the output


I found this code snippet by searching for 'how to create a pie chart in chart js' .you can try any such use case!

Environment Tested

I tested this solution in the following versions. Be mindful of changes when working with other versions.

  1. The solution is created in Visual Studio Code 1.75.1.


Using this solution, we are able to process form using angular js with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to create a pie chart in chart js.

FAQ

1. What is the difference between a pie chart and a doughnut chart in Chart.js?

A pie chart and a doughnut chart in Chart.js both represent data in a circular format. A doughnut chart has a hole in the center, while a pie chart is solid. The primary difference is the presence of a hole in the doughnut chart.


2. How do you create a pie chart using Chart.js?

To create a pie chart using Chart.js, you need to include the library in your HTML file. create a canvas element. get the 2D context of the canvas, and then use the new Chart () with the specified type (e.g.,' pie') and data.


3. What makes Chart.js stand out as a popular charting library for web developers?

Chart.js stands out for its simplicity and ease of use. It offers a declarative approach to creatingcharts in HTML5. It provides a wide range of customization options. It supports responsive design and has an active community. it is making it a preferred choice for web developers.


4. Can I use area charts in conjunction with pie charts in Chart.js?

No, area charts and pie charts serve different purposes and represent data. While pie charts show parts of a whole, area charts represent quantitative data over time. They are not used together in the same visualization.


5. What are the main components of a pie chart created with Chart.js?

The main components of a pie chart in Chart.js include the canvas element for rendering. the new Chart() specifying 'pie' as the type. the data object containing labels and datasets with values. Options for customization, such as colors and tooltips. Including it can enhance the chart's appearance and interactivity

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