<?php
/**
* $Id: ScaleImage.php,v 1.2 2002/05/24 20:38:18 dennis Exp $
* @author Dennis Iversen <dennisbech@yahoo.dk>
* @version 0.1
*/
class ScaleImage {
/**
* placeholder for image being manipulated
* @var string
*/
var $image;
/**
* imageType of the image to scale to (eg. png, jpg, gif etc.)
* @var string
*/
var $distExtension;
/**
* quality of the scaled image (only applying to jpg)
* @var int
*/
var $quality=100;
/**
* placeholder for imageType, eg. 'jpg' or 'png'
* var $imageType;
*/
var $imageType;
/**
* wether or not to send headers when flushing image.
* @var sendHeaders
*/
var $sendHeaders=true;
/**
* get vaious info about image. If imageType is empty, the class will try
* to detect the 'imageType'. Currently autodetection of 'imageType' works with
* png, gif, jpeg. Set imageType if image is eg. GD or WBMP.
*
* @constructor
* @param string orginal image to scale (url or file)
* @param string imageType (eg. GD, WBMP)
*/
function ScaleImage($image='', $imageType=''){
if (isset($image)){
$this->setImage($image, $imageType);
}
}
/**
* open info and set info
*
* @param string (image or url)
* @access public
*/
function setImage($image, $imageType=''){
$this->setImageInfo($image);
if ($this->imageType=='unknown'){
$this->imageType=$imageType;
if ( empty($this->imageType) || $this->imageType == 'unknown'){
die("Specify imageType to scale from");
}
}
if ($this->imageType=='gif'){
$this->image=imagecreatefromgif($image);
} else if ($this->imageType=='jpg' || $this->imageType=='jpeg'){
$this->image=imagecreatefromjpeg($image);
} else if ($this->imageType=='png'){
$this->image=imagecreatefrompng($image);
} else if ($this->imageType=='gd'){
$this->image=imagecreatefromgd($image);
} else {
die("Unsupported source image type: $imageType");
}
}
/**
* find image size
*
* @param string file path
* @return array image info
* @access private
*/
function setImageInfo($image){
$this->info=getimagesize($image, $this->info);
if ($this->info[2]==1){
$this->imageType='gif';
} else if ($this->info[2]==2){
$this->imageType='jpg';
} else if ($this->info[2]==3){
$this->imageType='png';
} else {
$this->imageType='unknown';
}
}
/**
* scale according to a Maximum height
*
* @param int maxWidth (maximum width)
* @param string distImageType (scale to this imageType (jpg/png)
* @param string save image in this file (if empty output to
* browser)
* @access public
*/
function scaleMaxHeight ($maxHeight, $filename='', $distImageType=''){
if (empty($distImageType)){
$distImageType=$this->imageType;
}
if ($this->info[0] <> $this->info[1]){
$x = $maxHeight;
$div= $this->info[0] / $maxHeight;
$y = (int) $this->info[1] / $div;
} else {
$x=$y=$maxHeight;
}
$this->scale($x, $y, $filename, $distImageType);
}
/**
* scale according to a Maximum width
*
* @param int maxWidth (maximum width)
* @param string imageType (scale to this imageType (jpg/png)
* @param string save image in this file (if empty output to
* browser)
* @access public
*/
function scaleMaxWidth($maxWidth, $filename='', $distImageType=''){
if (empty($distImageType)){
$distImageType=$this->imageType;
}
if ($this->info[0] <> $this->info[1]){
$y = $maxWidth;
$div= $this->info[1] / $maxWidth;
$x = $this->info[0] / $div;
} else {
$x=$y=$maxWidth;
}
$this->scale($x, $y, $filename, $distImageType);
}
/**
* scale according to x and y cordinates
*
* @param int x Width
* @param int y Height
* @param string imageType (scale to this imageType (jpg/png)
* @param string save image in this file (if empty output to
* browser)
* @access public
*/
function scaleXY($x, $y, $filename='', $distImageType=''){
$this->scale($x, $y, $filename, $distImageType);
}
/**
* scale image so the largest of x or y has gets a max of q
*
* @param int max Width or Height
* @param string imageType (scale to this imageType (jpg/png)
* @param string save image in this file (if empty output to
* browser)
* @access public
*/
function scaleXorY($max, $filename='', $distImageType=''){
if ($this->info[0] < $this->info[1]){
$this->scaleMaxWidth($max, $filename, $distImageType);
} else {
$this->scaleMaxHeight($max, $filename, $distImageType);
}
}
/**
* scale according to a percentage, eg 50.
*
* @param int percentage (percentage)
* @param string imageType (scale to this imageType (eg. jpg/png)
* @param string save image in this file (if empty output to
* browser)
* @access public
*/
function scalePercentage($percentage, $filename='', $distImageType=''){
if (empty($distImageType)){
$distImageType=$this->imageType;
}
$percentage=$percentage/100;
$x=$percentage * $this->info[0];
$y=$percentage * $this->info[1];
$this->scale($x, $y, $filename, $distImageType);
}
/**
* scale the image
*
* @param $x width
* @param $y height
* @param $imageType imageType (type of image)
* @param string filename (file to put image to)
* @access private
*/
function scale($x, $y, $filename='', $distImageType=''){
if ($distImageType=='gif'){
$distImage=imagecreatetruecolor($x, $y);
$this->copyResampled($distImage, $this->image, $x, $y);
if (empty($filename)){
header("Content-Type: image/gif");
$res=@imagejpeg($distImage, '', $this->quality);
} else {
imagegif($distImage, $filename, $this->quality);
}
} else if ($distImageType=='jpg' || $distImageType=='jpeg'){
$distImage=imagecreatetruecolor($x, $y);
$this->copyResampled($distImage, $this->image, $x, $y);
if (empty($filename)){
header("Content-Type: image/jpeg");
imagejpeg($distImage, '', $this->quality);
} else {
imagejpeg($distImage, $filename, $this->quality);
}
} else if ($distImageType=='png'){
$distImage=imagecreatetruecolor($x, $y);
$this->copyResampled($distImage, $this->image, $x, $y);
if (empty($filename)){
header("Content-Type: image/png");
imagepng($distImage, '', $this->quality);
} else {
imagepng($distImage, $filename, $this->quality);
}
} else if ($distImageType=='gd'){
$distImage=imagecreatetruecolor($x, $y);
$this->copyResampled($distImage, $this->image, $x, $y);
if (empty($filename)){
header("Content-Type: image/gd");
imagegd($distImage, '', $this->quality);
} else {
imagegd($distImage, $filename, $this->quality);
}
} else if ($distImageType=='wbmp'){
$distImage=imagecreatetruecolor($x, $y);
$this->copyResampled($distImage, $this->image, $x, $y);
if (empty($filename)){
header("Content-Type: image/wbmp");
imagewbmp($distImage, '', $this->quality);
} else {
imagewbmp($distImage, $filename, $this->quality);
}
} else {
die ("Could'nt transform image!");
}
}
/**
* resample the image
*
* @param resource distImage (destination image)
* @param resource image (sourceImage)
* @param int
* @param int
* @access private
*/
function copyResampled(&$distImage, $image, $x, $y){
imagecopyresampled(
$distImage,
$image,
0, 0, 0, 0,
$x,
$y,
$this->info[0],
$this->info[1]
);
return '';
}
}
?>
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