PerlinNoise RPG Map Generator

RPGMapGenerator.php

<?php

require 'vendor/autoload.php';

/**
 * composer require martinlindhe/php-noisegenerator
 */
class RPGMapGenerator
{
    private int $width;
    private int $height;
    private float $scale;
    private array $biomes = [
        'Water' => [0, 0, 255],
        'Surface' => [0, 128, 255],
        'Sand' => [255, 166, 87],
        'Road' => [128, 128, 128],
        'Stone' => [105, 105, 105],
        'Dirt' => [104, 109, 29],
        'Forest' => [34, 139, 34],
    ];

    public function __construct(int $width, int $height, float $scale = 1.0)
    {
        $this->width = $width;
        $this->height = $height;
        $this->scale = $scale;
    }

    public function generateMap(string $outputFile): void
    {
        #$noise = new PerlinNoise();
        $noise = new \NoiseGenerator\PerlinNoise(3000);
        $octaves = array(64, 64, 2, 2, 2, 2, 2);
        $image = imagecreatetruecolor($this->width, $this->height);

        for ($y = 0; $y < $this->height; $y++) {
            for ($x = 0; $x < $this->width; $x++) {
                $value = $noise->noise($x * $this->scale, $y * $this->scale, 0, $octaves);
                $biomeColor = $this->getBiomeColor($value);
                $color = imagecolorallocate($image, $biomeColor[0], $biomeColor[1], $biomeColor[2]);
                imagesetpixel($image, $x, $y, $color);
            }
        }

        imagepng($image, $outputFile);
        imagedestroy($image);
    }

    private function getBiomeColor(float $value): array
    {
        if ($value < -0.3) {
            return $this->biomes['Water'];
        } elseif ($value < -0.2) {
            return $this->biomes['Surface'];
        } elseif ($value < -0.1) {
            return $this->biomes['Sand'];
        } elseif ($value < 0.1) {
            return $this->biomes['Road'];
        } elseif ($value < 0.2) {
            return $this->biomes['Stone'];
        } elseif ($value < 0.3) {
            return $this->biomes['Dirt'];
        } else {
            return $this->biomes['Forest'];
        }
    }
}

// Example usage:
$mapGenerator = new RPGMapGenerator(512, 512, 1.0);
$mapGenerator->generateMap('output_map.png');