55 lines
2 KiB
JavaScript
55 lines
2 KiB
JavaScript
const PRNG = require('./prng');
|
|
const Planet = require('./planet');
|
|
const utils = require('./utils');
|
|
const data = require('./data.json');
|
|
|
|
function Star(name, seed, position) {
|
|
this.name = name;
|
|
this.seed = seed;
|
|
this.position = position;
|
|
return this;
|
|
}
|
|
Star.prototype.detail = function() {
|
|
var pseudoRandom = new PRNG(this.seed)
|
|
, detail = {}
|
|
, spectralClass = pseudoRandom.pick(["O", "B", "A", "F", "G", "K", "M"], [0.0001, 0.2, 1, 3, 8, 12, 20])
|
|
, spectralIndex = pseudoRandom.range(0, 9)
|
|
, stellarTemplate = data.starTypes[spectralClass];
|
|
detail.spectralType = spectralClass + spectralIndex;
|
|
detail.luminosity = stellarTemplate.luminosity * (4 / (spectralIndex + 2)) * 50;
|
|
detail.radius = Math.sqrt(detail.luminosity);
|
|
detail.numberOfPlanets = pseudoRandom.range(stellarTemplate.planets[0], stellarTemplate.planets[1]);
|
|
detail.planetSeed = pseudoRandom.range(0, 1000000);
|
|
detail.template = stellarTemplate;
|
|
return detail;
|
|
}
|
|
Star.prototype.planets = function() {
|
|
var detail = this.detail()
|
|
, planets = []
|
|
, pseudoRandom = new PRNG(detail.planetSeed)
|
|
, radius_min = 0.4 * pseudoRandom.realRange(0.5, 2)
|
|
, radius_max = 50 * pseudoRandom.realRange(0.5, 2)
|
|
, total_weight = (Math.pow(detail.numberOfPlanets, 2) + detail.numberOfPlanets) * 0.5
|
|
, r = radius_min;
|
|
for (var i = 0; i < detail.numberOfPlanets; i++) {
|
|
r += i / total_weight * pseudoRandom.realRange(0.5, 1) * (radius_max - radius_min);
|
|
planets.push(new Planet(utils.kappatalize(this.name) + "-" + utils.romanNumeral(i + 1),pseudoRandom.range(0, 100000),r,detail.luminosity / Math.pow(r, 2)));
|
|
}
|
|
return planets;
|
|
}
|
|
Star.prototype.description = function() {
|
|
let planets = [];
|
|
|
|
for (planet of this.planets()) {
|
|
planet.description = planet.description();
|
|
planets.push(planet);
|
|
}
|
|
|
|
return {
|
|
"detail": this.detail(),
|
|
"planets": planets
|
|
}
|
|
}
|
|
|
|
module.exports = Star;
|