keeping MC centered (scrolling)

[danulf]

How do I do so a MC is centered all the time?

I want the bg to scroll (like a racing track or whatever),
but I have no idea how! If you have like a tute about this i would really appreaciate (is that how it's spelled?) it.

Hope you understand.

[leoHEK]

dude it's easy don't put a moving script on the car but on the land put this.

onClipEvent (load) {
movespeed = 2;
}
onClipEvent (enterFrame) {
if (Key.isDown(Key.RIGHT)) {
_x-= movespeed;
}
if (Key.isDown(Key.LEFT)) {
_x+= movespeed;
}
if (Key.isDown(Key.UP)) {
_y+= movespeed;
}
if (Key.isDown(Key.DOWN)) {
_y-= movespeed;
}
}

[danulf]

Yeah, I tried that, but then the car doesn't move like a real car.
I have a script so when you press left, the car rotates left and so on.

Thank you anyway man.

[Dr Warm]

is it a topdown view? and u want the ground to spin with the car? and move forward in the direction?

then this might work having under onClipEvent(enterFrame){
this._rotation = car_mc._rotation;
and then the rest of it

[danulf]

I tried it, but it doesn't work the way I want it to.

What I'm looking for is just a script to center the car MC,
so that if it turns left 90 degrees you go to the left (the map doesn't rotate, but the car do, making the map scroll depending on where the car is)...
Hope you understand.

[Dr Warm]

ok i think i get it, but i would have thought the code from leohek would have done that, maybe u should post ur fla, and i'll see what i can do

Please post it in MX format if u can, i've only got like 7 days left of trial for MX 2004!

[A7RSTR7K3]

So are you trying to say that you want the map to scroll depending on which way the car is facing? And the keys control which way it faces? I think I get it. You could use leohek's code, except on the key press, you also need to add in to set the cars rotation to whatever like this...
if (Key.isDown(Key.RIGHT)) {
_x-= movespeed;
_rotation = 90;
}

That should work I think thats what you want.
Note: Double check that your reference point is in the center of the mc.

[Dr Warm]

(the map doesn't rotate, but the car do, making the map scroll depending on where the car is) i don't think he wants the map to rotate

[danulf]

ok, here it is! btw, does anyone know a good ActionScript site?
Cause I wanna learn more about it, I'm just a n00b on that part right now :beam:

[Dr Warm]

well the best way to learn is just to make stuff, like anything, that's what i found anyway, and then when u can't do something post it on here

look in the sticky about game resources for links to actionscript sites, but the main ones are

actionscript.org <-- lots of tutes, lots of downloads in movies
here
flashkit.com <-- tons of movies, tutes but the aren't so many good ones

[danulf]

ok, thanks! I'm gonna check it out right now

[Dr Warm]

hey that games pretty cool, but u were thinking about the scrolling wrong, u don't want the car to move, u want the ground to move! change the code to this:

onClipEvent (enterFrame) {
//This code will advance the car forward.
if (Key.isDown(Key.UP)) {
speed -= 1;
} else {
// This will make the car go backwards
if (Key.isDown(Key.DOWN)) {
speed += 1;
} else {
speed *= 1;
}
}
//The car will start to slow down after the speed of 25
if (Math.abs(speed)>25) {
speed *= .6;
}
// This will change the angle of the car
if (Key.isDown(Key.LEFT)) {
_rotation += speed;
}
if (Key.isDown(Key.RIGHT)) {
_rotation -= speed;
}
// This will make the car move
speed *= .9;
x = Math.sin(_rotation*(Math.PI/180))*speed;
y = Math.cos(_rotation*(Math.PI/180))*speed*-1;
if (!_root.move.hitTest(_x+x, _y+y, true)) {
_root.ground._x += x;
_root.ground._y += y;
} else {
speed *= -.3;
}
} i didn't change much, change some plus signs to minus, and put _root.ground._x and _y instead of just _x and _y. Much better!

[danulf]

You're my hero! :beer:

Thank you man! You're the greatest problemsolver ever!

[Dr Warm]

You're the greatest problemsolver ever! umm i don't think that i am, only by the fact that i get help of these forums too :D