phpengine/engine/lib/Thumbnail.class.php

<?php
/*
Author: Blaz Grapar, blaz.grapar@email.si

Please don't delete my name in the script. Thanks.

This simple class creates a thumbnail of an image. Size of thumbnail is determined with maximum width and height of an thumbnail.


EXAMPLE:
$myThumb = new Thumbnail; // Start using a class
$myThumb->setMaxSize( 200, 200 ); // Specify maximum size (width, height)
$myThumb->setImgSource(	'image_original.jpg' ); // Specify original image filename
$myThumb->Create( 'image_thumbnail.jpg' ); // Specify destination image filename or leave empty to output directly

You can also get additional info about original image or thumbnail...

$myThumb = new Thumbnail; // Start using a class
$myThumb->setImgSource(	'image_original.jpg' ); // Specify original image filename
$myThumb->getImageData( 'width' ) // This will get you pixel width of original image. getImageData arguments are width|height|type

You can also use getThumbData to see the size of thumbnail that will be created.
$myThumb = new Thumbnail; // Start using a class
$myThumb->setMaxSize( 200, 200 ); // Specify maximum size (width, height)
$myThumb->getThumbData( 'width' ) // This will get you pixel width of thumbnail image. getImageData arguments are width|height|type


*/


class Thumbnail
{

	// Set destination filename
	function setImgSource( $source )
	{
		$this->source = $source;
	}

	// Set maximum size of thumbnail
	function setMaxSize ( $max_width = 100, $max_height = 100 )
	{
		$this->max_width = $max_width;
		$this->max_height = $max_height;
	}


	// Get info about original image
	function getImageData( $data )
	{
		$size = getimagesize( $this->source );

		switch ( $data )
		{
		case 'width':
			return $size[0];
			break;
		case 'height':
			return $size[1];
			break;
		case 'type':
			switch ( $size[2] )
			{
			case 1:
				return 'gif';
				break;
			case 2:
				return 'jpg';
				break;
			case 3:
				return 'png';
				break;
			}
			break;
		}
	}

	// Get info about thumbnail
	function getThumbData( $data ){
		$w_ratio = $this->max_width  / $this->GetImageData('width');
		$h_ratio = $this->max_height / $this->GetImageData('height');

		if ( $h_ratio < $w_ratio ){
			$height = $this->max_height;
			$width = round( $this->GetImageData('width') * $h_ratio, 0);
		}else{
			$width = $this->max_width;
			$height = round( $this->GetImageData('height') * $w_ratio, 0);
		}

		switch ( $data ){
		case 'width':
			return $width;
			break;
		case 'height':
			return $height;
			break;
		}
	}


	// Creating a thumbnail
	function Create( $dest = NULL ){
		$img_des = imagecreatetruecolor( $this->GetThumbData('width'), $this->GetThumbData('height') );

		$background = imagecolorallocate( $img_des , 255 , 255 , 255 );
		imagefill( $img_des , 0 , 0 , $background );

		switch ( $this->GetImageData('type') ){
		case 'gif':
			$img_src = imagecreatefromgif( $this->source );
			break;

		case 'jpg':
			$img_src = imagecreatefromjpeg( $this->source );
			break;

		case 'png':
			$img_src = imagecreatefrompng( $this->source );
			break;
		}

		// GD 1.0
		//ImageCopyResized( $img_des, $img_src, 0, 0, 0, 0, $this->GetThumbData('width'), $this->GetThumbData('height'), $this->GetImageData('width'), $this->GetImageData('height') );
		// GD 2.0
		imagecopyresampled( $img_des, $img_src, 0, 0, 0, 0, $this->GetThumbData('width'), $this->GetThumbData('height'), $this->GetImageData('width'), $this->GetImageData('height') );

		switch ( $this->GetImageData('type') ){
		case 'gif':
			if ( empty( $dest ) ){
				ob_start();
				//header( "Content-type: image/gif" );
				imagegif( $img_des );
				$return = ob_get_clean();
				return $return;
			}else{
				return imagegif( $img_des, $dest );
			}
			break;

		case 'jpg':
			if ( empty( $dest ) ){
				ob_start();
				//header ( "Content-type: image/jpeg" );
				imagejpeg( $img_des );
				$return = ob_get_clean();
				return $return;
			}else{
				return imagejpeg( $img_des, $dest );
			}
			break;

		case 'png':
			if ( empty( $dest ) ){
				ob_start();
				//header ( "Content-type: image/png" );
				imagepng( $img_des );
				$return = ob_get_clean();
				return $return;
			}else{
				return imagepng( $img_des, $dest );
			}
			break;
		}
	}
}
?>