From 6a6ba96c967117a258da13ae1a5c775ae0099b48 Mon Sep 17 00:00:00 2001
From: Azgaar <maxganiev@yandex.ru>
Date: Thu, 16 Sep 2021 11:59:00 +0300
Subject: [PATCH] reset PRNG - make points generation deterministic

---
 main.js          | 1 +
 modules/utils.js | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/main.js b/main.js
index e44ee410..6037e5ca 100644
--- a/main.js
+++ b/main.js
@@ -669,6 +669,7 @@ function generateSeed() {
 // Place points to calculate Voronoi diagram
 function placePoints() {
   TIME && console.time("placePoints");
+  Math.random = aleaPRNG(seed); // reset PRNG
 
   const cellsDesired = +pointsInput.dataset.cells;
   const spacing = (grid.spacing = rn(Math.sqrt((graphWidth * graphHeight) / cellsDesired), 2)); // spacing between points before jirrering
diff --git a/modules/utils.js b/modules/utils.js
index 84389a3d..0624b15b 100644
--- a/modules/utils.js
+++ b/modules/utils.js
@@ -25,7 +25,8 @@ function getBoundaryPoints(width, height, spacing) {
 function getJitteredGrid(width, height, spacing) {
   const radius = spacing / 2; // square radius
   const jittering = radius * 0.9; // max deviation
-  const jitter = () => Math.random() * 2 * jittering - jittering;
+  const doubleJittering = jittering * 2;
+  const jitter = () => Math.random() * doubleJittering - jittering;
 
   let points = [];
   for (let y = radius; y < height; y += spacing) {