How to draw a circle in HTML5 Canvas using JavaScript?

Question

How to draw a simple circle in HTML5 Canvas using minimum JavaScript code?

Answer 1

First of all, you need to get the canvas context:-

const canvas = document.querySelector('#canvas');
const ctx = canvas.getContext('2d');

Now let us define the position and radius:-

const X = canvas.width / 2;
const Y = canvas.height / 2;
const radius = 45;

Now let us set the color and line width:-

ctx.lineWidth = 3;
ctx.strokeStyle = '#FF0000';

Now, to draw the circle, we have to use the arc method and set the angle to 2 X π

ctx.beginPath();
ctx.arc(X, Y, radius, 0, 2 * Math.PI, false);
ctx.stroke();