Pie progress mask

pieMask.hx

function drawProgressMask(graphics:Graphics, progress:Float, radius:Float = 50, x:Float = 0, y:Float = 0, rotation:Float = 0, sides:Int = 6):Void
{
	graphics.clear();
	graphics.beginFill(0);
	// graphics should have its beginFill function already called by now
	graphics.moveTo(x, y);
	if (sides < 3) sides = 3; // 3 sides minimum
	// Increase the length of the radius to cover the whole target
	radius /= Math.cos(1 / sides * Math.PI);
	// Shortcut function
	var lineToRadians:Float->Void = function(rads:Float):Void
	{
		graphics.lineTo(Math.cos(rads) * radius + x, Math.sin(rads) * radius + y);
	};
	// Find how many sides we have to draw
	var sidesToDraw:Int = Math.floor(progress * sides) + 1;
	for (i in 0...sidesToDraw) {
		lineToRadians((i / sides) * (Math.PI * 2) + rotation);
	}
	// Draw the last fractioned side
	if (progress * sides != sidesToDraw) lineToRadians(progress * (Math.PI * 2) + rotation);
	graphics.endFill();
}

based on http://flassari.is/2009/11/pie-mask-in-as3/