$.extend(CanvasRenderingContext2D.prototype, {
    // Circle methods
    circle:function(aX, aY, aDiameter){
        this.ellipse(aX, aY, aDiameter, aDiameter);
    },
    fillCircle:function(aX, aY, aDiameter){
        this.beginPath();
        this.circle(aX, aY, aDiameter);
        this.fill();
    },
    strokeCircle:function(aX, aY, aDiameter){
        this.beginPath();
        this.circle(aX, aY, aDiameter);
        this.stroke();
    },
    // Ellipse methods
    ellipse:function(aX, aY, aWidth, aHeight){
        var hB = (aWidth / 2) * .5522848,
            vB = (aHeight / 2) * .5522848,
            eX = aX + aWidth,
            eY = aY + aHeight,
            mX = aX + aWidth / 2,
            mY = aY + aHeight / 2;
        this.moveTo(aX, mY);
        this.bezierCurveTo(aX, mY - vB, mX - hB, aY, mX, aY);
        this.bezierCurveTo(mX + hB, aY, eX, mY - vB, eX, mY);
        this.bezierCurveTo(eX, mY + vB, mX + hB, eY, mX, eY);
        this.bezierCurveTo(mX - hB, eY, aX, mY + vB, aX, mY);
        this.closePath();
    },
    fillEllipse:function(aX, aY, aWidth, aHeight){
        this.beginPath();
        this.ellipse(aX, aY, aWidth, aHeight);
        this.fill();
    },
    strokeEllipse:function(aX, aY, aWidth, aHeight){
        this.beginPath();
        this.ellipse(aX, aY, aWidth, aHeight);
        this.stroke();
    }
});