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HTML Canvas Curves

Example

Your browser does not support the HTML5 canvas tag.
const canvas = document.getElementById("myCanvas");
const ctx = canvas.getContext("2d");

ctx.beginPath();
ctx.arc(100, 50, 50, 0, Math.PI);
ctx.stroke();
Try it Yourself »

The arc() Method

An arc is a part of circle, defined by center point coordinates and a radius:

Arc Angles

Canvas Arc Drawing

Arc drawing uses Paths in the Canvas:

MethodDescriptionDraws
beginPath()Start a pathNo
arc()Define a curveNo
stroke()Do the drawingYes

To draw a circle on a canvas, use the following methods:

  • beginPath() - Begin a path
  • arc(x,y,r,start,end) - Define a circle
  • stroke() - Stroke it

arc(x,y,r,start,end) - creates an arc (a curve).

To create a circle, set start angle to 0 and end angle to 2 * Math.PI.

The x and y parameters define the coordinates of the center of the circle.

The r parameter defines the radius of the circle.