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HTML canvas arc() Method

HTML canvas Reference HTML Canvas Reference

Example

Create a circle:

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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

The numbers in the table specify the first browser version that fully supports the method.

Method
arc() Yes 9.0 Yes Yes Yes

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 »

HTML canvas Reference HTML Canvas Reference