html5-canvas Path (Syntax only) arcTo (a path command)
Example
context.arcTo(pointX1, pointY1, pointX2, pointY2, radius);
Draws a circular arc with a given radius. The arc is drawn clockwise inside the wedge formed by the current pen location and given two points: Point1 & Point2.
A line connecting the current pen location and the start of the arc is automatically drawn preceding the arc.
<!doctype html>
<html>
<head>
<style>
body{ background-color:white; }
#canvas{border:1px solid red; }
</style>
<script>
window.onload=(function(){
// get a reference to the canvas element and it's context
var canvas=document.getElementById("canvas");
var ctx=canvas.getContext("2d");
// arguments
var pointX0=25;
var pointY0=80;
var pointX1=75;
var pointY1=0;
var pointX2=125;
var pointY2=80;
var radius=25;
// A circular arc drawn using the "arcTo" command. The line is automatically drawn.
ctx.beginPath();
ctx.moveTo(pointX0,pointY0);
ctx.arcTo(pointX1, pointY1, pointX2, pointY2, radius);
ctx.stroke();
}); // end window.onload
</script>
</head>
<body>
<canvas id="canvas" width=200 height=150></canvas>
</body>
</html>
