Slow HitTest

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.

Code:

---

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);

---

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

Code:

---

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

Code:

---

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

Cheers. It worked just like you said :D

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

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

Pretend that there are two movieclips mc1 and mc2.

Code:

---

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.

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