ImageResize.php

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class ImageResize
{
	private $dirpath = "./imgthumb/";
	private $quality = 85;
	private $imgurl;
	private $imgname;
	private $resurl;
	private $side = -1;
	private $im;
	private $w = 100, $h = 100;
	private $dim;
 
	function __construct($imgurl)
	{
		$this->imgurl = $imgurl;
		$this->dim = new Dimension(100, 100);
 
		list($name, $ext) = explode('.', $this->imgurl);
 
		$ext = strtolower($ext);
 
		if ($ext == 'jpg' || $exp == 'jpeg')
			$this->im = imagecreatefromjpeg($this->imgurl);
		else if ($ext == 'png')
			$this->im = imagecreatefrompng($this->imgurl);
		else if ($ext == 'gif')
			$this->im = imagecreatefromgif($this->imgurl);
		else
			$this->im = 0;
 
		if ($this->im != 0)
		{
			$tw = imagesx($this->im);
			$th = imagesy($this->im);
			if ($tw == $th) $this->side = -1;
			else if ($tw > $th) $this->side = 0;
			else $this->side = 1;
		}
	}
 
	function setSize($w, $h)
	{
		$dim = new Dimension($w, $h);
	}
 
	function getSize()
	{
		$d = $this->dim;
		return "[".$d->getWidth().", ".$d->getHeight()."]";
	}
 
	function setName($name)
	{
		$this->imgname = $name;
	}
 
	function getImageUrl()
	{
		return $this->resurl;
	}
 
	function setQuality($quality)
	{
		if ($quality > 0 && $quality <= 100)
			$this->quality = $quality;
		else
			print "Quality value out of bounds. Set a value between: 0 and 100";
	}
 
	function getQuality()
	{
		return $this->quality;
	}
 
	// TODO dare la possibilità al metodo di creare la cartella qualora fosse necessario
	function setImagePath($path)
	{
		if (isset($path) && $path != "")
			$this->dirpath = $path;
		else
			print "Path value must be not empty";
	}
 
	function getImagePath()
	{
		return $this->dirpath;
	}
 
	function checkProportions()
	{
		$wres = 0;
		$hres = 0;
 
		$d = $this->dim;
 
		# ridimensionamento orizzontale
		if ($this->side == 0)
		{
			$wres = $d->getWidth();
			$hres = intval(($wres / imagesx($this->im)) * imagesy($this->im));
		}
		# ridimensionamento verticale
		else if ($this->side == 1)
		{
			$hres = $d->getHeight();
			$wres = intval(($hres / imagesy($this->im)) * imagesx($this->im));
		}
		# ridimensionamento quadrato
		else
		{
			$wres = $d->getWidth();
			$hres = $d->getHeight();
		}
 
		$d = new Dimension($wres, $hres);		
 
		return $d;
	}
 
	function resize()
	{	
		$d = $this->checkProportions();
 
		# immagine di destinazione
		$resimg = imagecreatetruecolor($d->getWidth(), $d->getHeight());
 
		imagecopyresampled(
			$resimg, 		# immagine destinazione
			$this->im,		# immagine sorgente
			0, 0,			# angolo iniziale dell'immagine destinazione
			0, 0,			# angolo iniziale dell'immagine sorgente
			$d->getWidth(), $d->getHeight(),	# larghezza e altezza immagine ridimensionata
			imagesx($this->im), imagesy($this->im)	# dlarghezza e altezza immagine sorgente
			);
 
		$this->imgname = ($this->imgname=="") ? md5($this->imgurl).".jpg" : $this->imgname;
 
		$this->resurl = $this->dirpath . $this->imgname;
 
		imagejpeg($resimg, $this->resurl, $this->quality);
	}
 
	function __destruct()
	{
		imagedestroy($this->im);
	}
}