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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>JS Bin</title>
</head>
<body>
  <canvas id="thecanvas" width="400" height="400"></canvas>
  
    <script>
    var canvas = document.getElementById('thecanvas');
    
    if(canvas.getContext) 
    {
      var ctx = canvas.getContext('2d');
      drawEllipse(ctx, 10, 10, 100, 60);
      drawEllipseByCenter(ctx, 60,40,20,10);
    }
    
    function drawEllipseByCenter(ctx, cx, cy, w, h) {
      drawEllipse(ctx, cx - w/2.0, cy - h/2.0, w, h);
    }
    
    function drawEllipse(ctx, x, y, w, h) {
      var kappa = .5522848,
          ox = (w / 2) * kappa, // control point offset horizontal
          oy = (h / 2) * kappa, // control point offset vertical
          xe = x + w,           // x-end
          ye = y + h,           // y-end
          xm = x + w / 2,       // x-middle
          ym = y + h / 2;       // y-middle
    
      ctx.beginPath();
      ctx.moveTo(x, ym);
      ctx.bezierCurveTo(x, ym - oy, xm - ox, y, xm, y);
      ctx.bezierCurveTo(xm + ox, y, xe, ym - oy, xe, ym);
      ctx.bezierCurveTo(xe, ym + oy, xm + ox, ye, xm, ye);
      ctx.bezierCurveTo(xm - ox, ye, x, ym + oy, x, ym);
      ctx.closePath();
      ctx.stroke();
    }
​
    </script>
​
</body>
</html>
Output

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anonymouspro
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