Is a sharp edge from drawCircle possible?

Whenever I use:


myShape.graphics.beginFill(color);
myShape.graphics.drawCircle(someX, someY, circleDiameter);
myShape.graphics.endFill();
myBitmapData.draw(myShape); 

The edges are always soft, does anyone know how to make the edges sharp? Or do I have to write my own function to create a circle pixel by pixel to insure all of the pixels are the same color?

Thanks for any input on this.