HTML Reference Manual

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HTML canvas arc() method

arc() is a Canvas 2The arc() method is a Canvas D API method to draw an arc path. The center of the arc path is at (x, y) position, with a radius of r, and starts drawing from startAngle (default is clockwise) and ends at endAngle.

HTML canvas reference manual

Online Example

Draw a circle:

Example

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8>
<title>HTML canvas arc() method usage-Basic Tutorial(oldtoolbag.com)</<title>
</<head>
<body>
<canvas id="myCanvas" width="300" height="150" style="border:1px solid #d3d3d3>
Your browser does not support HTML5　canvas tag.
</canvas>
<script>
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
ctx.beginPath();
ctx.arc(100,75,50,0,2*Math.PI);
ctx.stroke();
</script>　
</body>
</html>

Test to see ‹/›

Browser Compatibility

IEFirefoxOperaChromeSafari

Internet Explorer 9and Safari support 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 a circle or part of a circle).

Tip:If you create a circle through arc(), please perform the following operations: set the start angle to 0, and set the end angle to2 * Math.PI.

Tip:Please use stroke() orfill() Method to draw an actual arc on the canvas.

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 value

Parameter	Description
x	X coordinate of the center of the circle.
y	Y coordinate of the center of the circle.
r	Radius of the circle.
sAngle	Start angle, in radians (the circular three o'clock position is 0 degrees).
eAngle	End angle, in radians.
counterclockwise	Optional. Specifies whether to draw in a clockwise or counterclockwise direction. False = clockwise, true = counterclockwise.

HTML canvas reference manual

HTML: <template> tag