75 lines
2 KiB
JavaScript
75 lines
2 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,
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spiral_angle_degrees = 360,
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min_radius = 0.05,
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max_radius = 0.9,
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thickness = 0.1,
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scatter_theta = Math.PI / spiral_arms * 0.2,
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scatter_radius = min_radius * 0.4,
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spiral_b = spiral_angle_degrees / Math.PI * min_radius / max_radius,
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start = (new Date()).getTime(),
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names = [],
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rejects = {
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badwords: 0,
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duplicates: 0
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},
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totalCount = amount,
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i,
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position,
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lastSeed;
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prng = new PRNG(seed);
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for (i = 0; i < totalCount; i++) {
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var number_of_syllables = Math.floor(prng.value() * 2 + 2), new_name;
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while (true) {
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new_name = utils.random_name(prng, 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 = prng.realRange(min_radius, max_radius);
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var theta = spiral_b * Math.log(r / max_radius) + prng.gaussrandom(scatter_theta);
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r += prng.gaussrandom(scatter_radius);
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// assign to a spiral arm
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theta += prng.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: prng.gaussrandom(thickness * 0.5) * 100
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};
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//FIXME: For some fucking reason the code only works if I call a prng value right here.
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prng.value()
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stars.push(new Star(new_name, Math.floor(prng.value() * 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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