Better seed handling in perlin noise

Add seed, width and height to get param
Make map terrain more generic

src/MapGenerator.php

@@ -10,16 +10,19 @@ class MapGenerator
 
     public function __construct(
         private readonly Renderer $renderer,
+        ?int                      $seed = null,
+        private readonly int      $width = 280,
+        private readonly int      $height = 140,
     )
     {
-        $this->noise = new Noise();
+        $this->noise = new Noise($seed);
     }
 
-    public function getMap(): array
+    public function getPixels(): array
     {
         $pixels = [];
-        for ($x = 0; $x < 280; $x++) {
-            for ($y = 0; $y < 140; $y++) {
+        for ($x = 0; $x < $this->width; $x++) {
+            for ($y = 0; $y < $this->height; $y++) {
                 $pixels[] = $this->drawPixel($x, $y, $this->noise->generate($x, $y));
             }
         }
@@ -29,9 +32,19 @@ class MapGenerator
     private function drawPixel(int $x, int $y, Color $color): string
     {
         return $this->renderer->render('pixel.html.twig', [
-            'x' => $x,
-            'y' => $y,
+            'x' => $x + 1,
+            'y' => $y + 1,
             'color' => $color,
         ]);
     }
+
+    public function getWidth(): int
+    {
+        return $this->width;
+    }
+
+    public function getHeight(): int
+    {
+        return $this->height;
+    }
 }

src/Noise.php

@@ -9,38 +9,38 @@ class Noise
     private readonly PerlinNoise $noise;
 
     public function __construct(
-        float $seed = 0.0,
+        ?int $seed = null,
     )
     {
-        $this->noise = new PerlinNoise(4564561234);
+        $this->noise = new PerlinNoise($seed);
     }
 
     public function generate(int $x, int $y): Color
     {
+        $deepwater = new Color(0, 110, 180);
         $water = new Color(0, 156, 244);
         $sand = new Color(238, 226, 104);
         $grass = new Color(25, 171, 64);
-//        $mountain = new Color(169, 94, 64);
         $mountain = new Color(96, 93, 100);
         $snow = new Color(255, 255, 255);
 
         $rand = $this->noise->random2D($x, $y, 150);
-//        $rand = $this->sigmoid($rand);
 
-        if ($rand < 0.0) {
-            return $water->lerp($sand, $rand + 1.0);
-        } elseif ($rand <= 0.5) {
-            return $sand->lerp($grass, $rand * (1.0 / 0.5));
-        } elseif ($rand <= 0.99) {
-            return $grass->lerp($mountain, ($rand - 0.5) * (1.0 / 0.49));
-        } else {
-            return $mountain->lerp($snow, ($rand - 0.99) * (1.0 / 0.01));
+        $transitions = [
+            [-1.0, $deepwater],
+            [-0.9, $water],
+            [0.0, $sand],
+            [0.8, $grass],
+            [0.997, $mountain],
+            [1.0, $snow],
+        ];
+
+        for ($i = 0; $i < count($transitions) - 1; $i++) {
+            $transition = $transitions[$i];
+            $nextTransition = $transitions[$i + 1];
+            if ($rand >= $transition[0] && $rand < $nextTransition[0]) {
+                return $transition[1]->lerp($nextTransition[1], ($rand - $transition[0]) * (1.0 / ($nextTransition[0] - $transition[0])));
+            }
         }
-
-//        return new Color(
-//            red: $rand * 255,
-//            green: $rand * 255,
-//            blue: $rand * 255,
-//        );
     }
 }

src/PerlinNoise.php

@@ -9,7 +9,7 @@ class PerlinNoise
     private float $seed;
     private int $_default_size = 64;
 
-    public function __construct(float $seed = null)
+    public function __construct(?int $seed = null)
     {
         //Initialize the permutation array.
         $this->p = [];
@@ -36,10 +36,11 @@ class PerlinNoise
 
         //And set the seed
         if ($seed === null) {
-            $this->seed = time();
-        } else {
-            $this->seed = $seed;
+            $seed = time();
         }
+
+        srand($seed);
+        $this->seed = rand(0, 1000000);
     }
 
     function noise($x, $y, $z, $size = NULL): float|int

src/index.php

@@ -7,8 +7,8 @@ include "Renderer.php";
 include "MapGenerator.php";
 
 $renderer = new Renderer();
-$map = new MapGenerator($renderer);
+$map = new MapGenerator($renderer, $_GET['seed'], (int)$_GET['width'], (int)$_GET['height']);
 
 echo $renderer->render('map.html.twig', [
-    'pixels' => $map->getMap(),
+    'map' => $map,
 ]);

templates/map.html.twig

@@ -7,7 +7,7 @@
 
     .map {
         display: grid;
-        grid-template-columns: repeat(279, var(--pixel-size));
+        grid-template-columns: repeat({{ map.width }}, var(--pixel-size));
         grid-auto-rows: var(--pixel-size);
         grid-gap: var(--pixel-gap);
     }
@@ -21,7 +21,7 @@
 </style>
 
 <div class="map">
-    {% for pixel in pixels %}
+    {% for pixel in map.pixels %}
         {{ pixel|raw }}
     {% endfor %}
 </div>