What is the best way to deal with very slow 2d motion?

[awflasher]

Making Motion in AS3 is not hard, but to make a very very slow motion, I met a lot of troubles today.

Well, I have some stuff on my stage and I wanna move them very very slowly, using a "Timer", then I have two ways to go. But both of them have disadvantages.

1) Make the interval as small as possible, and add 0.005 to sprite.x in each time handler;

Disadvantage:

I'm afraid Flash was working in a strange way since as2 when dealing with small float numbers, sometimes the x value of a sprite is even not changing when "sprite.x += 0.005" is executed.

2) Add 1 to sprite.x in each time handler but make the interval much bigger.

Disadvantage:

To let the sprite move in a bigger interval could also slow it down, even save a lot of the CPU cost. But then the animation is performing very bad smoothing.

So is there anybody who has a better solution for this case? Maybe not using Timer? Anyway, thanks in advance!

[justkevin]

I can't find anything about this in the docs, but it seems Flash doesn't track movement at a scale below ~1/20 of a pixel. I store my object's position separately, then update the display object's coordinates.

E.g.:
protected var _x:Number = 0.0;
protected var _y:Number = 0.0;
protected var sprite:Sprite = new Sprite();
...

this._x += dx;
this._y += dy;
this.sprite.x = this._x;
this.sprite.y = this._y;

[substance]

I would go with a tweener engine honestly. Basically it would allow you to say "move to this point over the course of XX seconds" and it will do the rest for you.

[sandrapaul]

Quite interesting.