<?php
declare(strict_types=1);
error_reporting(-1);
require_once __DIR__ . '/../vendor/autoload.php';
$mapWidth = $_GET['w'] ?? 100;
$mapHeight = $_GET['h'] ?? 100;
$offsetX = $_GET['x'] ?? 0;
$offsetY = $_GET['y'] ?? 0;
$scale = $_GET['scale'] ?? 5;
$zoom = $_GET['zoom'] ?? 0.025;
$octaves = $_GET['octaves'] ?? 4;
$persistence = $_GET['persistence'] ?? 0.5;
$elevation = $_GET['elevation'] ?? 1.0;
$gradient = $_GET['gradient'] ?? 'greyscale.png';
$gradient = imagecreatefrompng(__DIR__ . '/gradients/' . $gradient);
$colors = [];
for ($i = 0; $i < 256; $i++) {
$colors[] = imagecolorat($gradient, $i, 1);
}
$displayWidth = $mapWidth * $scale;
$displayHeight = $mapHeight * $scale;
$noiseImage = imagecreatetruecolor((int)$mapWidth, (int)$mapHeight);
$displayImage = imagecreatetruecolor($displayWidth, $displayHeight);
$noise2D = new \BlackScorp\SimplexNoise\Noise2D(
(float)$zoom,
(int)$octaves,
(float)$persistence,
(float)$elevation
);
for ($x = 0; $x < $mapWidth; $x++) {
for ($y = 0; $y < $mapHeight; $y++) {
$locationX = $offsetX + $x;
$locationY = $offsetY + $y;
$greyValue = $noise2D->getGreyValue($locationX, $locationY);
$color = $colors[$greyValue];
imagesetpixel($noiseImage, $x, $y, $color);
}
}
imagecopyresampled(
$displayImage,
$noiseImage,
0,
0,
0,
0,
$displayWidth,
$displayHeight,
(int)$mapWidth,
(int)$mapHeight
);
header('Content-Type:image/png');
imagepng($displayImage);
imagedestroy($displayImage);
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