HTML5 Tutorial

HTML5 Forms

Draw 3/4 of a circle:

JavaScript:

var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
ctx.beginPath();
ctx.arc(100,75,50,0*Math.PI,1.5*Math.PI);
ctx.stroke();

The arc method draws along a circle.

Specify size,position and what part of the circle that should be drawn by using the six parameters.

Use the fill() or stroke() methods to draw the arc on the canvas.

Startangle

arc(100,75,50,0*Math.PI,1.5*Math.PI)

Endangle

arc(100,75,50,0*Math.PI,1.5*Math.PI)

Center

arc(100,75,50,0*Math.PI,1.5*Math.PI)

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

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.

Parameter	Values	Description	Play it
x	x-coordinate	The x-coordinate of the center of the circle	Play it »
y	y-coordinate	The y-coordinate of the center of the circle	Play it »
r	radius	The radius of the circle	Play it »
sAngle	number	Specifies where in the circle's angle the drawing should start	Play it »
eAngle	number	Specifies where in the circle's angle the drawing should end	Play it »
clockwise	true/false	Optional, specifies whether the drawing should be clockwise or not	Play it »

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