Scrolling with coefficients

[mobichan]

I feel like I have asked this a million times before, but can someone please explain how to do the following? I have a horizontal auto scrolling game where I want to be able to use MMF2's layer coefficients to scroll my layers at different speeds (ie parallax). The layers need to wrap/repeat and they can be any width (one or more screens wide). I want all my game elements to stay stationary so that the game only takes place from 0 to 640 (the window is 640x480) and the background scrolls by.

The only way I know how to do this is by manually scrolling some large actives and resetting them when their x pos is below the left side of the frame. But this method doesn't allow the use of the layer coefficients.

If anyone could whip up a simple example or suggest the basic code for this, I'd really appreciate it. I know this sounds super basic, but I am just not getting this "easy" MMF concept. T_T

Mobichan

[Jacob]

If you set the virtual frame width to -1 it will look like an infinite loop.

[mobichan]

Wow. That is a handy bit of knowledge. Out of curiousity, are there any problems with scrolling the frame infinitely like that? I noticed that all the objects will scroll pretty far along in x and I wonder if there could be memory issues?

But what I was hoping to do was not have my objects actually scrolling through the level (not change x pos). I was using the layer object to set the layers' position to their current pos + a value, but that method only allows integers. And I need a scroll speed slower than 1.

[Sumo]

only allows integers? are you sure?

current Pos + 0.25?

[mobichan]

Anything under 1.0 and it doesn't scroll at all. T_T Is that a bug?

[mobichan]

Sorry for bumping, but can anyone confirm that only integers work for scrolling coefficients?

[uprize]

I would imagine so, you cannot scroll 0.5 of a pixel in MMF

[DavidN]

Scrolling coefficients under 1 definitely work, I use them myself for parallaxing backgrounds...