From d4f4778a5d960cd360a37a1fea7b052f2312d5a8 Mon Sep 17 00:00:00 2001
From: Daniel Bulant <danbulant@gmail.com>
Date: Tue, 28 Oct 2025 11:24:10 +0100
Subject: [PATCH] improved plasma clouds

---
 week7/PlasmaClouds.java | 36 +++++++++++++++++++++++++++---------
 1 file changed, 27 insertions(+), 9 deletions(-)

diff --git a/week7/PlasmaClouds.java b/week7/PlasmaClouds.java
index f59fd75..6ac65e8 100644
--- a/week7/PlasmaClouds.java
+++ b/week7/PlasmaClouds.java
@@ -11,23 +11,41 @@ public class PlasmaClouds {
 
         StdDraw.enableDoubleBuffering();
 
-        draw(.5, .5, 1, 1, variance, s);
+        draw(.5, .5, 1, StdRandom.uniformDouble(), StdRandom.uniformDouble(), StdRandom.uniformDouble(), StdRandom.uniformDouble(), variance, s);
 
         StdDraw.show();
     }
 
-    public static void draw(double x, double y, double halfSize, double color, double var, double s) {
-        if (halfSize < 0.01) {
-            StdDraw.setPenColor((int) (color * 255), (int) (color * 255), 255);
+    // c = color ("color vertical horizontal")
+    // t = top
+    // r = right
+    // l = left
+    // m = middle (horizontal)
+    // c = center (vertical)
+    public static void draw(double x, double y, double halfSize, double ctl, double ctr, double cbl, double cbr, double var, double s) {
+        var color = (ctl+ctr+cbl+cbr) / 4;
+        if (halfSize < 1/512.) {
+            var clamped = Math.clamp(color, 0, 1);
+            StdDraw.setPenColor((int) (clamped * 255), (int) (clamped * 255), 255);
             StdDraw.filledRectangle(x, y, halfSize, halfSize);
             return;
         }
-        var newColor = Math.clamp(StdRandom.gaussian(color, Math.sqrt(var)), 0, 1);
+        var newColor = StdRandom.gaussian(color, Math.sqrt(var));
         var newVar = var / s;
         var newHalfSize = halfSize / 2;
-        int[][] offsets = { { 1, 1 }, { -1, 1 }, { -1, -1 }, { 1, -1 } };
-        for (var offset : offsets) {
-            draw(x + newHalfSize * offset[0], y + newHalfSize * offset[1], newHalfSize, newColor, newVar, s);
-        }
+
+        var ctm = (ctl + ctr) / 2;
+        var cbm = (cbl + cbr) / 2;
+        var ccl = (cbl + ctl) / 2;
+        var ccr = (cbr + ctr) / 2;
+
+        // tl
+        draw(x - newHalfSize, y - newHalfSize, newHalfSize, ctl, ctm, ccl, newColor, newVar, s);
+        // tr
+        draw(x + newHalfSize, y - newHalfSize, newHalfSize, ctm, ctr, newColor, ccr, newVar, s);
+        // bl
+        draw(x - newHalfSize, y + newHalfSize, newHalfSize, ccl, newColor, cbl, cbm, newVar, s);
+        // br
+        draw(x + newHalfSize, y + newHalfSize, newHalfSize, newColor, ccr, cbm, cbr, newVar, s);
     }
 }