AS 3 simple ease - actionscript-3

Question

How can I move an object and be able to physically see it when it is moving? Not just disappear and appear on a different location like it would be using the following code.
buttonL2_btn.addEventListener(MouseEvent.CLICK, left);
function left(event:Event):void{
box_mc.x =241.5;
}
This is going to move myObject to any location specified, but again I want to be able to see it when moving.

Answer 1

In your example you are just setting it's X position when some button is pressed, when you need to change X into an EnterFrame event, like this:
this.addEventListener(Event.ENTER_FRAME, move);
function move(event:Event):void{
box_mc.x -= 5
}
Your box_mc should move left 5 pixels accordingly with your framerate.
You can use a easing library to that easily. I strongly recommend TweenMax.

Answer 2

Okay I am getting a bit sick of people constantly suggesting some tweening engine. Sure they rock, but it won't help the OP to understand what he is doing.
Kircho to move an object with a really easy tween I suggest the following code in an onEnterFrame event for your object to move:
addEventListener(Event.ENTER_FRAME, onEnterFrame);
var xGoal:Number = 100; //:: The target X destination for your object
var yGoal:Number = 100; //:: The target Y destination for your object
var smothness:Number = 10; //:: Smoothness factor for movement. The lower the value the faster the movement.
function onEnterFrame(e:Event):void
{
box_mc.x += (xGoal - box_mc.x) / smothness;
box_mc.y += (yGoal - box_mc.y) / smothness;
}
Will move/ease your box object to the desired location with a set smoothness.

Answer 3

You can install any of the 437 available tweening engines
or you can add a few lines of code
set up a variable that holds the destination value
var dest:Number = 241.5; // this is what gets updated on mouse click
on enterframe event for box:
function onBoxEnterFrame(e:MouseEvent):void{
if (dest != box_mc.x){
var easeNum:Number = 0.4 // between 0 and 1, the higher the number, the slower the transition
box_mc.x = box_mc.x * easeNum + dest * (1-easeNum);
}
}
you can add a few more lines to snap the position when it is close (less than 0.1 difference) or use a more linear change where you adjust incrementally like box_mc.x += 5; until it matches the dest number