How to do y scrolling in a platformer

[Jiggakilla]

Im sick of doing shotty y scrolling by myself and im pretty sure theres an ezer way to do it that magically will solve all my problems and before you call me a lazy nub i've been working it at it for days my hygiene is reflecting my work can someone please show me some way to do it in ACTIONSCRIPT TWO format, preferably in ClipEvent or frame mode, none of that complicated as3 stuff it makes my butt hurt thanks i am forever in your debt james mcloud i will make you part of my cornerian army

[ImprisonedPride]

Ok well, what's the problem? What are you trying to do? How are you trying to do it now? This forum isn't a "magical" solution; give us a proper post and we'll give you a proper response.

[Jiggakilla]

onClipEvent (load) {
    gravity = 1;
    yvel = 0;
    airrotationvar = 0;
    speed = 0;
    power = 2;
    friction = .93;
    rotationvar = 0;
    gravity = true;
}
onClipEvent (enterFrame) {
    _root.square._y += yvel;
    _root.leftsquare._y += yvel;
    _root.rightsquare._y += yvel;
    _root.limitbar._y += yvel;
    _root.bg._x += speed;
    airrotationvar *= .95;
    if (_root.bg.hitTest(_root.square._x, _root.square._y-2, true)) {
        speed *= friction;
    }
    if (!_root.bg.hitTest(_root.square._x, _root.square._y-2, true)) {
        speed *= .98;
    }
    _root.square._rotation += rotationvar;
    _root.square._rotation += airrotationvar;
    _root.leftsquare._y -= rotationvar/2.25;
    _root.rightsquare._y += rotationvar/2.25;
    if (Key.isDown(Key.LEFT)) {
        if (speed<=12) {
            speed += (power/1.5);
        }
    }
    if (Key.isDown(Key.RIGHT)) {
        if (speed>=-12) {
            speed -= (power/2);
        }
    }
    if (!_root.bg.hitTest(_root.square._x, _root.square._y-3, true)) {
        gravity = true;
        if (Key.isDown(Key.LEFT)) {
            if (airrotationvar>=-10) {
                airrotationvar -= (power/2);
            }
        }
        if (Key.isDown(Key.RIGHT)) {
            if (airrotationvar<=10) {
                airrotationvar += (power/2);
            }
        }
        if (yvel<=15) {
            yvel += (gravity*2);
        }
        // 
        rotationvar = 0;
        _root.leftsquare._y = _root.square._y;
        _root.rightsquare._y = _root.square._y;
        _root.limitbar._y = _root.square._y-30;
    } else {

        while (_root.bg.hitTest(_root.square._x, _root.square._y-2, true)) {
            if (gravity == true) {
                airrotationvar = 0;
                _root.square._rotation = 0;
                gravity = false;
            }
            if (Key.isDown(Key.SPACE)) {
                yvel = -26;
            }
            if (!_root.bg.hitTest(_root.leftsquare._x, _root.leftsquare._y-6.3, true) and (_root.bg.hitTest(_root.rightsquare._x, _root.rightsquare._y-6.3, true))) {
                rotationvar = -2;
            }
            if (_root.bg.hitTest(_root.leftsquare._x, _root.leftsquare._y-6.3, true) and (_root.bg.hitTest(_root.rightsquare._x, _root.rightsquare._y-6.3, true))) {
                rotationvar = null;
            }
            if (!_root.bg.hitTest(_root.rightsquare._x, _root.rightsquare._y-6.3, true) and (_root.bg.hitTest(_root.leftsquare._x, _root.leftsquare._y-6.3, true))) {
                rotationvar = 2;
            }
            if (_root.square._rotation<=0) {
                _root.bg._x += (_root.square._rotation/-50);
            }
            if (_root.square._rotation>=0) {
                _root.bg._x += (_root.square._rotation/-50);
            }
            if (_root.limitbar.hitTest(_root.leftsquare._x, _root.leftsquare._y-6.5, true)) {
                _root.square._rotation = 0;
                rotationvar = 0;
                _root.leftsquare._y = _root.square._y;
                _root.rightsquare._y = _root.square._y;
                _root.limitbar._y = _root.square._y-30;
            }
            if (_root.limitbar.hitTest(_root.rightsquare._x, _root.rightsquare._y-6.5, true)) {
                _root.square._rotation = 0;
                rotationvar = 0;
                _root.leftsquare._y = _root.square._y;
                _root.rightsquare._y = _root.square._y;
                _root.limitbar._y = _root.square._y-30;
            }
            _root.square._y -= 2;
            _root.leftsquare._y -= 2;
            _root.rightsquare._y -= 2;
            _root.limitbar._y -= 2;
        }
    }
} 

This is the normal coding for just regular left and right scrolling where the leftsquare and rightsquare manage the rotation of the square mc. I would try replacing the _root.square._y -= yvel (yvelocity) with _root.bg._y += yvel, and the thing would just explode. Yes I am sorry if I came off as rude or inconsiderate relying only on the shoulders of people who code for a living. Im sure there has to be some moderation between the scrolling of the square and the background itself but its too difficult to do or when i try its not the result I want. Please help

[Jiggakilla]

http://megaswf.com/view/502bab9e6962...02cd9f492.html Here is my progress of just normal scrolling and such.
http://megaswf.com/view/18ba7ff5d42a...33c82600c.html Heres as far as I can get with the crappy scrolling :/

[omegaPlatypus]

I would suggest putting all your game elements inside of a "level" movieclip. That way you can just change the x and y position of the entire level to make it scroll. So as the level moves in one direction, the hero MC or what have you inside of the level moves in the other direction, so the hero remains in the same place relative to the edge of the stage. My platformer engine for AS3 has a class called GameCamera that does the camera part for you, you're welcome to adapt it to AS2 if you'd like.

[XenElement]

http://bryanheisey.com/blog/?p=1


That's probably the best way to handle screen movement in a platformer, just make the camera's y and or x equal to the player's x and y.

Cheers.

[Jiggakilla]

YAY FOR VCAM woot it works here it is it lags like a mofo but w/e
http://megaswf.com/view/fd2621eca562...108560ab4.html

[XenElement]

Glad it helped =D That's probably the simplest way, and that way, you have other functionality, since it's self contained.