53 lines
1.8 KiB
JavaScript
53 lines
1.8 KiB
JavaScript
const fs = require('fs');
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const PRNG = require('./prng');
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const Star = require('./star');
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const utils = require('./utils');
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const data = require('./data.json');
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var names = [];
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var stars = [];
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var planets = [];
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function generate(seed, amount) {
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if (!amount) amount = 1000;
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if (!seed) seed = 1234;
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var spiral_arms = 2, spiral_angle_degrees = 360, min_radius = 0.05, max_radius = 0.9, thickness = 0.1, scatter_theta = Math.PI / spiral_arms * 0.2, scatter_radius = min_radius * 0.4, spiral_b = spiral_angle_degrees / Math.PI * min_radius / max_radius, start = (new Date()).getTime(), names = [], rejects = {
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badwords: 0,
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duplicates: 0
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}, totalCount = amount, i, position;
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pseudoRandom = new PRNG(seed);
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for (i = 0; i < totalCount; i++) {
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var number_of_syllables = Math.floor(pseudoRandom.value() * 2 + 2), new_name;
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while (true) {
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new_name = utils.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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} else if (data.badwords.indexOf(new_name) >= 0 || data.badwords.indexContains(new_name) >= 0) {
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rejects.badwords++
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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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var r = pseudoRandom.realRange(min_radius, max_radius);
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var 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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// assign to a spiral arm
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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 * 100,
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y: Math.sin(theta) * r * 100,
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z: pseudoRandom.gaussrandom(thickness * 0.5) * 100
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};
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stars.push(new Star(new_name,pseudoRandom.range(1, 100000),position));
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}
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return stars;
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}
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module.exports = {
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"generate": generate
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}
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