[problem] zoom and focus

[marmotte]

[great new thread starter]
we really need to have a sticky per game genre. in a clean thread. that would be awesome

anyway, [problem]

i need to zoom in a MC, while focusing a known object... let's say yyyMC inside the xxxMC (xxxMC is located at 0;0)

the zoom code i wrote:

code:

---

// load

proportion = this.xxxMC._height/this.xxxMC._width;

zoom_value = 100;

// loop

this.onEnterFrame = function() {

	this.xxxMC._width++;

	this.xxxMC._height = this.xxxMC._width*proportion;

zoom_value--;

	if (zoom_value==0) {

		delete this.onEnterFrame;

	}

};

---

^ here, the image will be zooming during 100 frames...

now my question is: how to focus on this.xxxMC.yyyMC? so that it's located in the middle of the window when the zoom is finished?

say i catch its _x/_y values on load

code:

---

px = this.xxxMC.yyyMC._x

py = this.xxxMC.yyyMC._y

---

but what's next...? sure, it's simple, but... where is my logic!?!

thanks for the answers...