65 lines
2 KiB
JavaScript
65 lines
2 KiB
JavaScript
const PRNG = require('./PRNG');
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const badwords = require('./badwords');
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const utils = require('./utils');
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const Star = require('./Star');
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const spiral_arms = 2;
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const spiral_angle_degrees = 360;
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const min_radius = 0.05;
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const max_radius = 0.9;
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const thickness = 0.1;
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const scatter_theta = Math.PI / spiral_arms * 0.2;
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const scatter_radius = min_radius * 0.4;
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const spiral_b = spiral_angle_degrees / Math.PI * min_radius / max_radius;
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const names = [];
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const rejects = { badwords: 0, duplicates: 0 };
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class Galaxy {
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constructor(seed, number_of_stars) {
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this.stars = [];
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let i;
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let position;
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let pseudoRandom = new PRNG(seed);
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for (i = 0; i < number_of_stars; i++) {
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let number_of_syllables = Math.floor(pseudoRandom.value() * 2 + 2);
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let new_name;
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while (true) {
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new_name = PRNG.random_name(pseudoRandom, number_of_syllables);
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if (names.indexOf(new_name) >= 0) {
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rejects.duplicates++;
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}
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else if (badwords.indexOf(new_name) >= 0 || badwords.indexContains(new_name) >= 0) {
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rejects.badwords++
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}
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else {
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break;
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}
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}
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names.push(new_name);
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let r = pseudoRandom.realRange(min_radius, max_radius);
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let theta = spiral_b * Math.log(r / max_radius) + pseudoRandom.gaussrandom(scatter_theta);
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r += pseudoRandom.gaussrandom(scatter_radius);
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theta += pseudoRandom.range(0, spiral_arms - 1) * Math.PI * 2 / spiral_arms;
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position = {
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x: Math.cos(theta) * r,
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y: Math.sin(theta) * r,
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z: pseudoRandom.gaussrandom(thickness * 0.5)
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};
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this.stars.push(new Star(new_name, pseudoRandom.range(1, 100000), position));
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}
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}
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}
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module.exports = Galaxy;
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