Slow HitTest

[reachground]

The hunt continues. It took me several hours to understand how the hitTest should work. When I finally got it I found out that it didn't always work like it supposed to. The collision between the "defender" and the "attacker" work flawless, but when the bullets hit there's a delay. Not always though, only when you fire several shots at a time. Try it out here:

http://www.reachground.se/shugoshin.html

Controls: W-A-S-D -> Fire with ENTER.

When the defender and the attacker collides the defender is supposed to move to Y-300 and X-150. When the bullets hit the attacker the defender should move to Y-300 and X-375 (this is only for testpurposes). I tried to trace it too and it only reacted to some bullets but not all.

var allowfire:Number = 1;

arrow_mc.onEnterFrame = function() {
        if (Key.isDown(68)) {
            this._x += 10;
			if(this._x >537) {
				this._x=537;
				}
			}
        if (Key.isDown(65)) {
			this._x -= 10;
			if(this._x <13) {
				this._x=13;
				}
        	}
        if (Key.isDown(87)) {
             this._y -= 10;
			 if(this._y <15) {
				this._y=15;
			 	}
			}
        if (Key.isDown(83)) {
                this._y += 10;
				if(this._y >387) {
					this._y=387;
				}
			}
		if(this.hitTest(ball)) {
			arrow_mc._y = 300;
			arrow_mc._x = 150;
	}
	arrowX = this._x;
	arrowY = this._y;
	
	if (Key.isDown(Key.ENTER)) {
		fireBullets();
	} else {
		allowFire = 1;
	}
}

var i:Number = 1;

function fireBullets() {
	if(allowFire == 1) {
		i += 1;
		var newname = "bullet"+i;
		_root.attachMovie("bullet", newname, i);
//		trace("bullet"+newname+i);
		_root[newname]._y = _root.arrow_mc._y-20;
		_root[newname]._x = _root.arrow_mc._x+0;
		allowFire = 0;
		_root[newname].onEnterFrame = function() {
			var bullet_speed = 10;
			this._y -= bullet_speed;
			if (this._y<0) {
				this.removeMovieClip();
			}
		}
	}
}

var angle:Number = 0;
var centerX:Number = randRange();
var range:Number = 20;
var xspeed:Number = 5;
var yspeed:Number = .6;

ball.onEnterFrame = function() {

	ball._y += xspeed;
	ball._x = centerX + Math.sin(angle) * range;
	angle += yspeed;
	if(ball._y > 400) {
		ball._y = -25;
		centerX = randRange();
		
		}else{
		if(this.hitTest(_root["bullet"+i])) {
			arrow_mc._y = 300;
			arrow_mc._x = 375;
		}
	}
}

function controlFire(){
	allowFire = 1;
}

var myListener:Object = new Object();
fireInt = setInterval(controlFire,500);

[alillm]

The ball is only checking for colision with one bullet (the last one fired)

if(this.hitTest(_root["bullet"+i])) {

"i" will just be the last value of i, and so you're only checking the last bullet.

To fix this, you either need to do a loop in your ball code to go through all the bullets

for (var j=0; j<i; j++) {
if(this.hitTest(_root["bullet"+j])) {
//im dead
}
}

or you could just put code on each bullet checking for collision with the ball instead.

Ali

[reachground]

Cheers. It worked just like you said

[swak]

Also, using the built-in flash hitTest functions are kind of slow. I suggest you try checking distance if you can.

[reachground]

Hey Swak, could you tell me more about that...in a 6-year old type of manner?

[swak]

Pretend that there are two movieclips mc1 and mc2.

var distance:Number = 0;
onEnterFrame = function(){
distance = Math.sqrt(Math.pow(mc2._x-mc1._x,2)+Math.pow(mc2._y-mc1._y,2));
if(distance < 50){
//hit
}
}

this is off the top of my head the "distance =" is the main part of it. it finds out how far the two movieclips are.

[reachground]

Thanks. Too tired to think atm. I'll get a good look at it in the morning...afternoon.