gravitywell/planet.js

function Planet(game, depth) {
	this.id = 0;
	this.position = {x: 800, y: 0};
	this.velocity = {x: 0, y: 0};
	this.angleRadians = 0;
	this.fireRate = 5;
	this.lifetime = 100;
	this.timeToDie = 0;
	this.isDead = false;
	this.planetColor = "#AAAAAA";
	this.radius = 100;
	this.orbitRadius = 2000;
	this.angleRadians = 0;
	this.orbitSpeed = 1;
	this.rotationRadians = 0;
	this.rotationSpeed = 0.001;
	this.system = null;
	this.mass = 1000;
	this.teamId = 0;
	this.teamColor = "#DDDDDD";
	this.type = "barren";
	this.resources = 50;
	this.resourceRate = 0;

	this.init = function(solar) {
		this.system = solar;
		this.orbitRadius = 2000 * (depth + 1);
		this.angleRadians = (2 * Math.PI) * Math.random();

		this.position.x = solar.position.x + (this.orbitRadius * Math.cos(this.angleRadians));
		this.position.y = solar.position.y + (this.orbitRadius * Math.sin(this.angleRadians));

		this.radius = 100;
		this.mass = 1000;
		this.type = "barren";
		if(depth > 2 && depth < 6) {
			this.planetColor = "#33DD33";
			this.radius = 140;
			this.mass = 2800;
			this.type = "habitable";
			this.resourceRate = 1;
		}
		
		this.rotationRadians = (2 * Math.PI) * Math.random();
		//this.orbitSpeed = 0.00001 * Math.pow(1/1000, depth);
		this.orbitSpeed = 0.00001;// * Math.pow(1/10, depth);

	}

	this.tick = function() {
		this.resources += this.resourceRate;
	};

	this.update = function(delta) {
		this.angleRadians += this.orbitSpeed;
		this.rotationRadians += this.rotationSpeed;
		this.position.x = this.system.position.x + (this.orbitRadius * Math.cos(this.angleRadians));
		this.position.y = this.system.position.y + (this.orbitRadius * Math.sin(this.angleRadians));

	}
	this.draw = function(context) {
		var solar = {x: 0, y: 0};
		solar.x = this.system.position.x;
		solar.y = this.system.position.y;
		//context.save();
		//context.translate(solar.x, solar.y);
		//context.rotate(this.angleRadians);

		context.save();
		context.fillStyle = "#000000";
		context.translate(this.position.x, this.position.y);
		context.beginPath();
		context.arc(0, 0, this.radius, 0, 2 * Math.PI);
		context.fill();
		context.restore();

		context.strokeStyle = "#3333DD";
		context.lineWidth = 1;
		
		context.save();
		context.translate(this.system.position.x, this.system.position.y);
		context.beginPath();
		context.arc(0, 0, this.orbitRadius, 0, 2 * Math.PI);
		context.stroke();
		context.restore();
		
		context.save();
		context.strokeStyle = this.planetColor;
		context.lineWidth = 2;
		context.translate(this.position.x, this.position.y);
		context.rotate(this.rotationRadians);
		context.beginPath();
		context.arc(0, 0, this.radius, 0, 2 * Math.PI);
		context.stroke();

		//for(var index in this.structures) {
		//	var building = this.structures[index];
		//	building.draw(context);
		//}
		/*context.beginPath();
		context.fillStyle = "#33BBBB";
		context.strokeStyle = "#33DDDD";
		context.rect(10, 10, 50, 30);
		context.fill();
		context.stroke();

		context.restore();*/

		context.restore();

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

		//ownership flag
		context.beginPath();
		context.fillStyle = this.teamColor;
		context.rect(-8, -6, 16, 12);
		context.fill();

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

		context.restore();
	}

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

	this.claim = function(ship) {
		this.teamId = ship.teamId;
		this.teamColor = ship.shipColor;
		ship.setSpawn(this);
	};

	this.canSpawnShip = function() {
		return this.resources > 10;
	};

	this.spawnShip = function() {
		this.resources -= 10;
	}
};