bildgröße

<?
// Inhalt: Klasse zum Erstellen von Thumbnails
// Autor:  Reitinger Matthias a.k.a. reima (plz give proper credit)

class thumb
{
	var $im = 0;

	function thumb($file=0, $width=0, $height=0)
	{
		if ($file && $width && $height) {
			$this->create($file, $width, $height);
		}
	}

	function create($file, $width=0, $height=0, $resample=0)
	{
		if ($this->im) $this->clear();

		list($src_width, $src_height, $src_type) = getimagesize($file);
		if ($src_type != 2) return false; // kein jpeg => abbrechen
		
		if ($width == 0) {
			$width = round($height * ($src_width/$src_height));
		}
		if ($height == 0) {
			$height = round($width * ($src_height/$src_width));
		}
		
		$src_im = imagecreatefromjpeg($file);
		$this->im = imagecreatetruecolor($width, $height);
		
		if ($resample) {
			imagecopyresampled($this->im, $src_im, 0, 0, 0, 0,
				$width, $height, $src_width, $src_height);
		} else {
			imagecopyresized($this->im, $src_im, 0, 0, 0, 0,
				$width, $height, $src_width, $src_height);
		}
		
		imagedestroy($src_im);
				
		return true;
	}

	function savetofile($file, $quality=75)
	{
		imagejpeg($this->im, $file, $quality);
	}

	function output($quality=75)
	{
		header("Content-type: image/jpeg");
		imagejpeg($this->im, "", $quality);
	}

	function clear()
	{
		imagedestroy($this->im);
		$this->im = 0;
	}
}
?>

<?
include("class.thumb.php"); // oder was auch immer

$thumb = new thumb(); // Klasseninstanz erstellen
$thumb->create("bild1.jpg", 320, 240); // Thumbnail erstellen
$thumb->output(); // Bild an den Browser ausgeben
$thumb->clear(); // Aufräumen
?>

<?
include("class.thumb.php");

$thumb1 = new thumb();
$thumb1->create("bild1.jpg", 320, 0, 0);
$thumb1->savetofile("bild1t1.jpg", 60); // Bild speichern
$thumb1->clear();

$thumb2 = new thumb();
$thumb2->create("bild1.jpg", 0, 480, 1);
$thumb2->savetofile("bild1t2.jpg", 80);
$thumb2->clear();
?>