arcTo(): Drawing Curves using control points on Canvas

gctx.arcTo(x1,y1,x2,y2,r);
x1: First control point x coordinate
y1: First control point y coordinate
x2: Second control point x coordinate
y2: Second control point y coordinate
r : Radius of Arc or Circle ( Positive only )
var my_canvas=$('#my_canvas').get(0)
var gctx = my_canvas.getContext("2d");
gctx.beginPath();
gctx.strokeStyle = 'gray';
gctx.lineWidth = 4;
gctx.moveTo(120, 20);
gctx.lineTo(230,20);
gctx.lineTo(230,180);
gctx.stroke();
///First graph, draw the arc ///
gctx.beginPath();
gctx.moveTo(120, 20); 
gctx.strokeStyle = 'red';
gctx.lineWidth = 1;
gctx.arcTo(230,20,230,180,80);
gctx.stroke();


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