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HTML canvas arc() Method

Canvas Object Reference Canvas Object

Example

Create a circle:

YourbrowserdoesnotsupporttheHTML5canvastag.

JavaScript:

var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
ctx.beginPath();
ctx.arc(100,75,50,0,2*Math.PI);
ctx.stroke();

Try it yourself »

Browser Support

Internet Explorer Firefox Opera Google Chrome Safari

Internet Explorer 9, Firefox, Opera, Chrome, and Safari support the arc() method.

Note: Internet Explorer 8 and earlier versions, do not support the <canvas> element.


Definition and Usage

The arc() method creates an arc/curve (used to create circles, or parts of circles).

Tip: To create a circle with arc(): Set start angle to 0 and end angle to 2*Math.PI.

Tip: Use the stroke() or the fill() method to actually draw the arc on the canvas.

An arc

Center
arc(100,75,50,0*Math.PI,1.5*Math.PI)
Start angle
arc(100,75,50,0,1.5*Math.PI)
End angle
arc(100,75,50,0*Math.PI,1.5*Math.PI)

JavaScript syntax: context.arc(x,y,r,sAngle,eAngle,counterclockwise);

Parameter Values

Parameter Description Play it
x The x-coordinate of the center of the circle Play it »
y The y-coordinate of the center of the circle Play it »
r The radius of the circle Play it »
sAngle The starting angle, in radians (0 is at the 3 o'clock position of the arc's circle) Play it »
eAngle The ending angle, in radians Play it »
counterclockwise Optional. Specifies whether the drawing should be counterclockwise or clockwise. False is default, and indicates clockwise, while true indicates counter-clockwise. Play it »


Canvas Object Reference Canvas Object

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