enemies.js

function Enemies(num) {
	PIXI.Container.call(this);
	this.guys = [];
	num.id = num.num||"0";
	this.num = num;
	this.speed = num.hasOwnProperty("s")?num.s:0.5;
	this.acc = 0.005+(0.01*g.difficulty)/(this.num.x*this.num.y);
	this.tex = g.ui.sprites.enemies[num.id+".png"];
	this.spacing = 30;
	this.scaler = 0.2; //100/this.tex.width;
	this.visible = false;
	this.delay = -100;
	this.enemies = 0;
	for (let i=0; i < num.x; i++) {
		this.guys[i] = [];
		for (let j=0; j < num.y; j++) {
			let guy = this.guys[i][j] = new PIXI.Sprite(this.tex);
			guy.x = this.scaler*(this.tex.width + this.spacing) * i;
			guy.y = this.scaler*(this.tex.height + this.spacing) * j;
			guy.tag = i+","+j;
			guy.scale = new PIXI.Point(this.scaler, this.scaler);
			this.enemies++;
			this.addChild(guy);
		}
	}
	this.myWidth = this.children[this.children.length-1].x+this.children[this.children.length-1].width;
	this.x = g.ui.width/2 - this.myWidth/2;
	this.y = g.ui.horizon;// - this.height/2;
	this.tag = "enemies";
}
Enemies.add = function(options) {
	let o = options||{};
	o.x = rnd(1,g.difficulty)
	o.y = rnd(1,g.difficulty)
	//o.y = o.y||rnd(10-o.x,5-o.x);
	o.num = o.num||rnd(0,53);
	if (g.enemies && g.enemies.children) g.entity.remove(g.enemies);
	g.enemies = new Enemies(o);
	g.entity.add(g.enemies);
}
Enemies.initSprites = function() {
	this.explosion = [];
	for (let i=0; i<10; i++)
		this.explosion.push(PIXI.Texture.fromFrame("ex" + i + ".png"));
};
Enemies.doExplosion = function(options) {
	let exploder = new PIXI.extras.AnimatedSprite(Enemies.explosion);
	exploder.loop=false;
	exploder.x = options.x;
	exploder.y = options.y;
	exploder.anchor.set(0.5);
	exploder.animationSpeed = 0.5;
	exploder.scale = new PIXI.Point(options.scale||1, options.scale||1);
	exploder.play();
	g.ui.stage.addChild(exploder);
	if (options.complete == "gameOver") {
		exploder.onComplete = function() {
			exploder.destroy();
			g.gameOver();
		}
	} else {
		exploder.onComplete = function() {
			exploder.destroy();
		}
	}
};
Enemies.prototype = Object.create(PIXI.Container.prototype);
Enemies.prototype.update = function() {
	if (this.freeze || this.children.length==0) return;
	if (this.delay++<0) return;
	this.visible = true;
	let d = 1 + 0.9*(this.y - g.ui.horizon)/g.ui.horizon;
	this.scale = new PIXI.Point(d,d);
	this.myWidth = (this.children[0].width + this.spacing)*d*this.num.x;
	this.x = g.ui.width/2 - this.width/2;
	this.y += this.speed;
	this.speed+=this.acc;
	if (this.y>g.ui.height) Enemies.add();
};
Enemies.prototype.collision = function(bb, mode) {
	if (this.freeze || this.children.length==0) return;
	if (this.delay++<0) return;
	let collided = false;
	for (let i in this.children) {
		let enemy = this.children[i];
		if (enemy.alpha==0) continue;
		let ab = enemy.getBounds();
		if (ab.x + ab.width > bb.x && ab.x < bb.x + bb.width && ab.y + ab.height > bb.y && ab.y < bb.y + bb.height) {
			if (mode=="player") {
				// Game Over
				this.freeze=true;
				g.resources.sfxExplosion1.sound.play();
				Enemies.doExplosion({
					x: g.player.x
					,y: g.player.y
					,scale: 3
					,complete: "gameOver"
				});
			} else {
				enemy.alpha = 0;
				this.enemies--;
				g.resources.sfxExplosion0.sound.play();
				Enemies.doExplosion({
					x:ab.x+ab.width/2
					,y:ab.y+ab.height/2
					,scale: this.scale.x
				});
				collided = true;
			}
			break;
		}
		if (collided) break;
	}
	if (!collided) return;
	if (this.enemies==0||this.children.length==0) {
		g.difficulty++;
		Enemies.add();
	}
	return true;
};