Generate Sphere

sphere.php

<?php

$is_shell_script = ! isset($_SERVER['REQUEST_URI']);

$width = $height = $depth = 5;

$hollow = false;

if ($is_shell_script) {
	for ($i = 1; $i < $argc; $i++) {
		if (preg_match('/\-([a-z])/i', $argv[$i], $matches)) {
			$flag = $matches[1];
			switch ($flag) {
			
				case 'o':
					$hollow = true;
					break;
				case 'w':
					$i++;
					$width = $argv[$i];
					break;
				case 'h':
					$i++;
					$height = $argv[$i];
					break;
				case 'd':
					$i++;
					$depth = $argv[$i];
					break;
			}
		}
	}
}

$width --;
$height --;
$depth --;

function generate_sphere($x_radius, $y_radius, $z_radius, $hollow = false, $tolerance = 0.1, $thickness = 0.5) {
	$sphere = Array();

	$radius = min($x_radius, $y_radius, $z_radius);

	$x_ratio = $x_radius / $radius;
	$y_ratio = $y_radius / $radius;
	$z_ratio = $z_radius / $radius;

	for ($z = -$z_radius; $z <= $z_radius; $z++) {
		for ($y = -$y_radius; $y <= $y_radius; $y++) {
			for ($x = -$x_radius; $x <= $x_radius; $x++) {

				$xP = $x / $x_ratio;
				$yP = $y / $y_ratio;
				$zP = $z / $z_ratio;


				$distance = sqrt($xP*$xP + $yP*$yP + $zP*$zP);

				if ($hollow) {
					$solid = abs($distance - $radius) <= $thickness;
				} else {
					$solid = ($distance - $tolerance) <  $radius;
				}

				$sphere[(string)$z][(string)$y][(string)$x] = $solid;
			}
		}
	}
	return $sphere;
}

$model = generate_sphere($width / 2, $depth / 2, $height / 2, $hollow);

if ($is_shell_script) {
	foreach ($model as $z => $plane) {
		foreach ($plane as $y => $row) {
			foreach ($row as $x => $col) {
				echo $col?'#':' ';
			}
			echo "\n";
		}
		echo "\n";
	}
} else {

	foreach ($model as $z => $plane) {
		echo '<table>';
		foreach ($plane as $x => $row) {
			echo '<tr>';
			foreach ($row as $y => $col) {
				echo '<td '.($col?'class="active"':'').'></td>';
			}
			echo '</tr>';
		}
		echo '</table>';
		echo '<br/>';
	}

	?>
	<style>

		table {
			border-collapse:collapse;
		}

		td {
			width:10px; height:10px;
			border:1px solid #000;
		}

		td.active {
			border-color:#fff;
			background-color:#000;
		}

	</style><?php
}