Basic Pie Chart Using JavaScript And Canvas – DiagJS

DiagJS is a simple-to-use JavaScript library that lets you dynamically draw an animated, interactive pie chart on an HTML5 canvas element.

How to use it:

Create an empty canvas element on which you want to draw the pie chart.

<canvas width="800" height="800" id="example">
  Sorry, canvas not supported
</canvas>

Download and insert the diagjs.js script into the web page.

<script src="diagjs.js">

Define the data (percentage values and color codes) in the JavaScript.

var elements = {
    dogs: 0.3,
    cats: 0.6,
    dinosaurs: 0.1
};
var colors = {
    dogs: 'green',
    cats: 'blue',
    dinosaurs: 'red'
};

Draw the pie chart on the canvas element and done.

var canvas = document.getElementById('can');
var diag = diagJS.PieChart(elements, colors, canvas);
diag.draw();