bezierCurveTo (a path command)

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context.bezierCurveTo(control1X, control1Y, control2X, control2Y, endingX, endingY)

Draws a cubic Bezier curve starting at the current pen location to a given ending coordinate. Another 2 given control coordinates determine the shape (curviness) of the curve.

<!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 startX=25;
    var startY=50;
    var controlX1=75;
    var controlY1=10;
    var controlX2=75;
    var controlY2=90;
    var endX=125;
    var endY=50;      
    
    // A cubic bezier curve drawn using "moveTo" and "bezierCurveTo" commands
    ctx.beginPath();
    ctx.moveTo(startX,startY);
    ctx.bezierCurveTo(controlX1,controlY1,controlX2,controlY2,endX,endY);
    ctx.stroke();

}); // end window.onload
</script>
</head>
<body>
    <canvas id="canvas" width=200 height=150></canvas>
</body>
</html>

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