Making a game like A.L.I.A.S.

[drosa10]

I want to make a battle system just like the one in ALIAS (http://www.compfused.com/directlink/693/ (http://www.compfused.com/directlink/693/)). But how do I make it so that the gun aims where the mouse is, and how do make the screen scroll once I reace halfway across the screen? I understand everything else.

[eiefai]

its a cool game, i like it very much

well, i think should be simply, you need some code to aim (some code to get the mouse position and rotation of your char weapon), code for firing (on mouse clic) and i think that's it, maybe i can show you a small example, just give time, i'll try to finish it tonight

[eiefai]

well, here's the example, but has a little bug, when you fire you can only fire one bullet, i try to fix it later...

it moves it arrow keys, and fire with a clic

hope this help you

[Lomadrian]

Here's a small code snippet I know works pretty well. It assumes that you have a gun movie clip named "gun_mc" pointing to the right with an empty movie clip at its tip named "tip" (inside the movie clip), and a bullet movie clip in your library with a linkage of "bullet" (this is with AS 2.0. If you want it in 1.0, just post your preference, and I'll rewrite it):


var bullet:Object = {counter:0, speed:10};
gun_mc.onMouseMove = function():Void {
updateAfterEvent();
var x:Number = _root._xmouse - this._x;
var y:Number = _root._ymouse - this._y;
var angle:Number = Math.atan2(y, x) * 180/Math.PI;
this._rotation = angle;
};
gun_mc.onMouseDown = function():Void {
bullet.counter++;
if (bullet.counter>100) { bullet.counter = 1; }
var name:String = "bullet_"+bullet.counter;
var point:Object = {x:this.tip._x, y:this.tip._y};
this.localToGlobal(point);
var bullet_mc:MovieClip = _root.attachMovie("bullet", name, bullet.counter, {_x:point.x, _y:point.y});
var angle:Number = this._rotation * Math.PI/180;
bullet_mc.xmov = Math.cos(angle)*bullet.speed;
bullet_mc.ymov = Math.sin(angle)*bullet.speed;
bullet_mc.onEnterFrame = function():Void {
this._x += this.xmov;
this._y += this.ymov;
if (this._x<0 || this._y<0 || this._x>Stage.width || this._y>Stage.height) {
this.removeMovieClip();
}
};
};
Mouse.addListener(gun_mc);


This code isn't really like A.L.I.S., but it does show how easy it can be to aim and shoot on a basic level.

[drosa10]

I get it now! It uses what I learned in Algebra. Thanx guys!

[drosa10]

New problem.(This is simular to my last question). My character has a sword in some levels. The arm and the sword rotate with the mouse so that it aims with the mouse. How do I make it so that it's swing power depends on how fast you swing the sword with the mouse?

[Joppe]

Omg! thats exactly what im trying to make! , Thanks Thank you so much .. I owe you one ;)

[drosa10]

Actuall, your blatent madness combat wannabe game is different then mine. In yours, you have to throw the weapon. In mine, you have to swing the weapon with a lot of force, but it is still in your arm.

[Joppe]

you talking to me?

[drosa10]

no, just the person named joppe

[Joppe]

Im not trying to make an
blatent madness combat wannabe game
Im making an very original platform styled game with the possibility to shoot like in A.L.I.A.S And In Madness Combat .. And you cant throw anything in my game just Shoot! and change weapon and blow people up!

[Lomadrian]

I'm not sure exactly how to do that, but I do know Madness Interactive has done something similar. You can download it here. (http://www.flecko.net/view.php?id=6)

[drosa10]

wow this is not really helping at all. And Lomadrian, your link doesn't work.

[Lomadrian]

I think you could use an onEnterFrame() method and an object array to store mouse positions. When a collision is detected, use the last few mouse positions in the array to figure out how fast it went, and how hard it should hit.

I'll try to come up with an example soon

[Lomadrian]

OK, here's a small example I came up with:


var mousePositions:Array = [null, {x:_root._xmouse, y:_root._ymouse}];
_root.onEnterFrame = function():Void {
mousePositions[0] = mousePositions[1];
mousePositions[1] = {x:this._xmouse, y:this._ymouse};
if (collision) {
var prev:Object = mousePositions[0];
var curr:Object = mousePositions[1];
var xdist:Number = curr.x-prev.x;
var ydist:Number = curr.y-prev.y;
var vel:Number = Math.sqrt((xdist*xdist)+(ydist*ydist));
}
};


In this, the variable "collision" in the if statement is just what you use to test for collisions. So, if you apply your collision method, just insert that before the if statement.

As the onEnterFrame method refreshes, it adds the newest mouse positions in to the object at mousePositions[1], and moves the one that was in 1 to 0. These mouse positions are used in the calculations of the velocity, which is just the distance between these two mouse points.

Hope this helps!

[drosa10]

how do I use this code?

[squishy]

Im not trying to make an
Im making an very original platform styled game with the possibility to shoot like in A.L.I.A.S And In Madness Combat .. And you cant throw anything in my game just Shoot! and change weapon and blow people up! hint: no blood

[Joppe]

hint: no blood
:P lol! :to: never blood in a funny fantasy land game :P

[squishy]

good. bloody game = bad game :to:

[Lomadrian]

OK, I made a small Flash file that does something close to what you're looking for. The only problem I'm having with it is the collision detection. I know there are frame-independant collision detection methods out there, but I'm not that good at it.

It has a small black ball as your weapon which follows the cursor, and when you hit the orange rectangle, it slides in the other direction.

Again, like I said, you have to move it kind of slowly because the collision detection stinks. I'll try to come up with a solution.

[drosa10]

It's a great and useful .fla but I don't want the user to have a free movement weapon. The weapon has to only stay in one spot. It can only rotate. It rotates to follow the mouse. When it hits an object, the force of it is calculated by ow fast you swing the mouse/sword.

[drosa10]

forget it. I think i get it now. All i need is help on how to keep the character in the center and make the screen scroll when he moves.

[Lomadrian]

OK, sorry. I misunderstood what you meant.

I think the same concept would work, except you store the weapon's rotation, not its position. Check out this .fla.

[Lomadrian]

For the scrolling thing, you can keep the character in one spot, just move the background movie clip. The problem with this is that it goes really slowly.

If you're doing a tile-based game with this, I would suggest checking out Tonypa's site. (http://www.tonypa.pri.ee/tbw/tut13.html)

If it's not tile-based, I'm afraid I can't help you much.

[drosa10]

what about in a side-scroller?

[Lomadrian]

Tonypa's tutorials work for side-scrolling too. You just change the way the character moves. The concept is exactly the same, though.

[AdamZZ]

lomadrian can you put up an example fla of the first code snippet you posted her cause i cant make it work :S

[AdamZZ]

ok it works perfect now :D