init();

function init() {
	angle = 0;
	r = w._width/2;
	rspeed = 0;
	maxspeed = Math.PI/30;
	a._x = (a._width/2)*-1;
	a._y = (a._height/2)*-1;
	a.speed = 2;
	b.speed = 1;
	i = 0;
	u = 0;
	maxi = 0;
	a.sec = 0;
	b._x = g._x;
	b._y = g._y;
	firedelay = 10;
	firewait = false;
}

_root.onEnterFrame = function() {
	gunmove();
	gunfire();
	enemy();
	moveEnemy();
	moveBullets();

};

function gunmove() {

	if (Key.isDown(Key.LEFT)) {
		rspeed = rspeed-Math.PI/200;
	} else if (Key.isDown(Key.RIGHT)) {
		rspeed = rspeed+Math.PI/200;
	} else {
		if (rspeed<0) {
			rspeed = rspeed+Math.PI/200;
		}
		if (rspeed>0) {
			rspeed = rspeed-Math.PI/200;
		}
	}
	if ((rspeed<Math.PI/200) && (rspeed>-Math.PI/200)) {
		rspeed = 0;
	}
	if (rspeed>maxspeed) {
		rspeed = maxspeed;
	} else if (rspeed<(maxspeed*-1)) {
		rspeed = maxspeed*-1;
	}
	angle = angle+rspeed;

	if(angle > Math.PI*2) {
		angle = angle - (Math.PI*2);
	} else if(angle< (Math.PI*2*-1)) {
		angle = angle + (Math.PI*2);
	}

	g._rotation = (angle*180)/Math.PI;

	g._x = w._x+(r*Math.sin(angle));
	g._y = w._y-(r*Math.cos(angle));
}

function gunfire() {
	b._x = g._x;
	b._y = g._y;
	if (firetimer>0) {
		firetimer -= 1;
		if (firetimer == 0) {
			firewait = false;
		}
	}
	if (Key.isDown(Key.SPACE)) {
		if (firewait == false) {
			u = u+1;
			duplicateMovieClip(b, "b"+u, u);
			currentb = eval("b"+u);
			currentb.dx = b.speed*Math.cos(angle-Math.PI/2);
			currentb.dy = b.speed*Math.sin(angle-Math.PI/2);
			firewait = true;
			firetimer = firedelay;
		}
	}
}

function enemy() {
	timer = random(20);
	if (timer == 1) {
		i = i+1;
		duplicateMovieClip(_root.a, "a"+i, i);
		currenta = eval("a"+i);
		rand = random(4)+1;
		if (rand == 1) {
			currenta.sec = 1;
			currenta._x = random(Stage.width);
			currenta._y = (a._height/2)*-1;
			currenta.dx = random(a.speed)+1;
			currenta.dy = random(a.speed)+1;
		} else if (rand == 2) {
			currenta.sec = 2;
			currenta._x = random(Stage.width);
			currenta._y = Stage.height+(a._height/2);
			currenta.dx = random(a.speed)+1;
			currenta.dy = (random(a.speed)+1)*-1;
		} else if (rand == 3) {
			currenta.sec = 3;
			currenta._x = (a._width/2)*-1;
			currenta._y = random(Stage.height);
			currenta.dx = random(a.speed)+1;
			currenta.dy = random(a.speed*2)-a.speed;
		} else if (rand == 4) {
			currenta.sec = 4;
			currenta._x = Stage.width+a._width/2;
			currenta._y = random(Stage.height);
			currenta.dx = (random(a.speed)+1)*-1;
			currenta.dy = random(a.speed*2)-a.speed;
		}
	}
}

function moveEnemy() {
	if (i>0) {
		for (h=i; h>0; h--) {
			currenta = eval("a"+h);
			currenta._x += currenta.dx;
			currenta._y += currenta.dy;
			if ((currenta._x>Stage.width+currenta._width/2) && currenta.dx>0) {
				removeMovieClip(currenta);
			} else if ((currenta._x<-currenta._width/2) && (currenta.dx<0)) {
				removeMovieClip(currenta);
			} else if ((currenta._y>Stage.height+currenta._height/2) && (currenta.dy>0)) {
				removeMovieClip(currenta);
			} else if ((currenta._y<-currenta._height/2) && (currenta.dy<0)) {
				removeMovieClip(currenta);
			}
		}
	}
}

function moveBullets() {
	if (u>0) {
		for (j=u; j>0; j--) {
			currentb = eval("b"+j);
			currentb._x += currentb.dx;
			currentb._y += currentb.dy;
			if ((currentb._x>Stage.width+currentb._width/2) && currentb.dx>0) {
				removeMovieClip(currentb);
				u--;
			} else if ((currentb._x<-currentb._width/2) && (currentb.dx<0)) {
				removeMovieClip(currentb);
				u--;
			} else if ((currentb._y>Stage.height+currentb._height/2) && (currentb.dy>0)) {
				removeMovieClip(currentb);
				u--;
			} else if ((currentb._y<-currentb._height/2) && (currentb.dy<0)) {
				removeMovieClip(currentb);
			}
		}
	}
}