How do I make a smoth zoom out like nanaca crash?

Does anyone have any tips on making a smooth zoom out/layout scale like the game, nanaca crash?

The problems I'm having are:

1) Keeping the layout stuck to the bottom.

2) Zooming out smoothly as the player moves up.

I think I could solve this the hard way, but I was wondering if there are some standard ways of doing this that I'm not aware of.

Thanks

Clamp() the scroll, and lerp() the zoom.

Thanks for the reply, newt. I had no idea about the clamp function. That should work nicely.

How exactly do you use clamp? What does it do?

Something like clamp(lerp(scroll.y,projectile.y,scrollspeed*dt),minyscroll, maxscrolly)

It clamps the y between the minimum, and maximum values.

Something like clamp(lerp(scroll.y,projectile.y,scrollspeed*dt),minyscroll, maxscrolly)

It clamps the y between the minimum, and maximum values.

Can you make a .capx example of how this would look like? That game mentioned isn't 'doing it for me' and I would like to know how the clamp and lerp actions are used.

https://dl.dropboxusercontent.com/u/666 ... anaC2.capx

The zoom would be based on the distance to either the top or the bottom, and would work pretty much the same clamp(lerp()).

Thanks for the example, newt. You're awesome.

You're welcome.

A lot of nostalgia for that game.