gravitywell/solarsystem.js

function SolarSystem(game, startPos) {
	this.id = 0;
	this.position = startPos;
	this.planets = [];
	this.ships = [];
	this.systemColor = null;
	this.radius = 400;
	this.mass = 150000;
	this.teamId = 0;

	this.init = function() {
		this.teamId = this.id;
		this.systemColor = this.getColor(this.teamId);

		for(var index in this.planets) {
			var planet = this.planets[index];
			planet.init(this);
		}

		var randomPlanet = this.planets[parseInt(this.planets.length * Math.random())];
		for(var index in this.ships) {
			var ship = this.ships[index];
			ship.init(this.systemColor, this);
		}
	}

	this.getColor = function(teamId) {
		switch(teamId) {
			case 1:
			return "crimson"; 
			case 2:
			return "orangered";
			case 3:
			return "gold";
			case 4:
			return "limegreen";
			case 5:
			return "dodgerblue";
			case 6:
			return "aqua";
			case 7:
			return "darkmagenta";
			case 8:
			return "ghostwhite";
			case 9:
			return "orchid";
		}
	}

	this.spawnPlanets = function(state){
		for(var i = 1; i <= 7; i++) {
			var isPlanet = parseInt(8 * Math.random()) > 4 || i == 4;
			if(isPlanet) {
				var planet = new Planet(game, i);
				planet.id = state.planetIndex++;
				
				if(i == 4) {
					planet.teamId = this.id;
					planet.teamColor = this.getColor(this.id);
				}
				this.planets.push(planet);
			}
		}
		return this.planets;
	}

	this.spawnShips = function(state){
		for(var i = 0; i < 4; i++) {
			var ship = new Ship(game, new BotController(game));
			ship.id = state.shipIndex++;
			this.ships.push(ship);
		}
		return this.ships;
	}

	this.tick = function() {
		for(var index in this.planets) {
			var planet = this.planets[index];
			planet.tick();
		}
	};

	this.update = function(delta) {
		for(var index in this.planets) {
			var planet = this.planets[index];
			planet.update(delta);
		}

	}
	this.draw = function(context) {
		//star
		context.fillStyle = "#000000";
		context.strokeStyle = "#DDDD33";
		context.lineWidth = 3;
		context.save();
		context.translate(this.position.x, this.position.y);
		context.beginPath();
		context.arc(0, 0, this.radius, 0, 2 * Math.PI);
		context.fill();
		context.stroke();
		context.restore();
		
		for(var index in this.planets) {
			var planet = this.planets[index];
			planet.draw(context);
		}

		context.save();
		context.translate(this.position.x, this.position.y);

		context.font = "16px sans-serif";
		context.textAlign = "center";
		context.fillStyle = "#DDDDDD";
		context.strokeStyle = "#333333";
		context.lineWidth = 2;
		var textMetrics = context.measureText("System " + this.id);
		var textWidth = textMetrics.width;
		context.fillText("System " + this.id, 0, 0);

		context.restore();
	}

	this.addGravity = function(ship) {
		var nearestSystemAngle = game.calculateAngleTo(this, ship);
		var nearestSystemDistance = game.calculateDistanceTo(this, ship);
		ship.acceleration.x += system.formatFloat((this.mass * (1 / Math.pow(nearestSystemDistance, 2))) * Math.cos(nearestSystemAngle));
		ship.acceleration.y += system.formatFloat((this.mass * (1 / Math.pow(nearestSystemDistance, 2))) * Math.sin(nearestSystemAngle));
	};


	this.checkCrash = function(ship) {
		if(ship.isDead) {
			return;
		}
		var distance = game.calculateDistanceTo(ship, this);
		if(this.radius + (ship.width / 2) > distance) {
			ship.touching = this;
			ship.die();
			return;
		}

		for(var planetIndex in this.planets) {
			var otherPlanet = this.planets[planetIndex];
			if(ship.touching == otherPlanet) {
				ship.touching = null;	
			}
			var distance = game.calculateDistanceTo(ship, otherPlanet);
			if(otherPlanet.radius + (ship.width / 2) > distance) {
				ship.touching = otherPlanet;
				if(Math.abs(ship.velocity.x) + Math.abs(ship.velocity.y) > 3) {
					ship.die();
					return;
				}
			}
		}
	}
};