function Main ()
{
	stage.addEventListener(Event.ENTER_FRAME, enterFrameHandler);
}
 
var destinationX:int = 150;
var destinationY:int = 150;
var dX:int = 0;
var dY:int = 0;
var vX:int = 0;
var vY:int = 0;
var moveSpeedMax:Number = 1000;
var rotateSpeedMax:Number = 15;
var trueRotation:Number = 0;
var decay:Number = 0.98;
 
function enterFrameHandler(event:Event):void
{
	updatePosition();
	updateRotation();
}
 
function updatePosition():void
{
	destinationX = stage.mouseX;
	destinationY = stage.mouseY;
	vX += (destinationX - water_drop.x) / moveSpeedMax;
	vY += (destinationY - water_drop.y) / moveSpeedMax;
 
	vX *= decay;
	vY *= decay;
 
	water_drop.x += vX;
	water_drop.y += vY;
}
 
function updateRotation():void
{
	dX = water_drop.x - destinationX;
	dY = water_drop.y - destinationY;
 
	var rotateTo:Number = getDegrees(getRadians(dX, dY));
 
	if (rotateTo > water_drop.rotation + 180) rotateTo -= 360;
	if (rotateTo < water_drop.rotation - 180) rotateTo += 360;
 
	trueRotation = (rotateTo - water_drop.rotation) / rotateSpeedMax;
	water_drop.rotation += trueRotation;
}
 
function getRadians(delta_x:Number, delta_y:Number):Number
{
	var r:Number = Math.atan2(delta_y, delta_x);
	if (delta_y < 0)
	{
		r += (2 * Math.PI);
	}
	return r;
}
 
function getDegrees(radians:Number):Number
{
	return Math.floor(radians/(Math.PI/180));
}