Source code of plot #060 back to plot
Download full working sketch as 060.tar.gz.
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Unless otherwise noted, code published here is © Gábor L Ugray, shared under the Creative Commons
BY-NC-SA license (Attribution, Non-Commercial, Share-Alike). Files in lib/thirdparty
, and additional
libraries in the downloadable archive, are shared under their respective open-source licenses, attributed
to their authors.
let rand = Math.random;
function setRandomGenerator(randomFun) {
rand = randomFun;
}
function mulberry32(seed) {
return function () {
var t = seed += 0x6D2B79F5;
t = Math.imul(t ^ t >>> 15, t | 1);
t ^= t + Math.imul(t ^ t >>> 7, t | 61);
return ((t ^ t >>> 14) >>> 0) / 4294967296;
}
}
function rand_range(min, max) {
return min + rand() * (max - min);
}
/**
* Returns a value between min and max, with clipped Gaussian distribution
* (Nothing >3.6 standard deviations away - less than 0.02% chance)
* @param {Number} min Low end of the range, inclusive
* @param {Number} max High end of the range, inclusive
* @param {Number} skew If 1, symmetric. N>1 skews left, 1/N skews right
*/
function randn_bm(min, max, skew = 1) {
// Based on https://stackoverflow.com/a/49434653
let u = 0, v = 0;
while (u === 0) u = rand() //Converting [0,1) to (0,1)
while (v === 0) v = rand()
let num = Math.sqrt(-2.0 * Math.log(u)) * Math.cos(2.0 * Math.PI * v)
num = num / 10.0 + 0.5 // Translate to 0 -> 1
if (num > 1 || num < 0)
num = randn_bm(min, max, skew) // resample between 0 and 1 if out of range
else {
num = Math.pow(num, skew) // Skew
num *= max - min // Stretch to fill range
num += min // offset to min
}
return num
}
/**
* Returns a number whose value is limited to the given range.
*
* Example: limit the output of this computation to between 0 and 255
* clamp(x * 255, 0, 255)
*
* @param {Number} x The number to clamp.
* @param {Number} min The lower boundary of the output range
* @param {Number} max The upper boundary of the output range
* @returns A number in the range [min, max]
* @type Number
*/
function clamp(x, min, max) {
return Math.min(Math.max(x, min), max);
}
function shuffle(array, rndFun) {
if (!rndFun) rndFun = rand;
// Fisher-Yates shuffle
// https://stackoverflow.com/a/2450976
let ix = array.length, randIx;
while (ix != 0) {
randIx = Math.floor(rndFun() * ix);
ix--;
[array[ix], array[randIx]] = [array[randIx], array[ix]];
}
return array;
}
function rand_select(array) {
let ix = Math.floor(rand() * array.length);
return array[ix];
}
export { rand, rand_range, setRandomGenerator, randn_bm, mulberry32, clamp, shuffle, rand_select };