Software for processing images PHP class implementation code for processing images

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/**
* author:yagas
* email:yagas60@21cn.com
*/
class Image
{
/**class protected variable*/
protected $th_width = 100;
protected $th_height = 50;
protected $quality = 85; //Picture quality
protected $transparent = 50; //Watermark transparency
protected $background = "255,255,255"; //Background color
/**
* Generate thumbnail file
* @param $src original image file
* @param $dst target file
*/
public function thumb($src, $dst=null, $output=true)
{
$thumb = array($this->th_width, $this->th_height);
$this->scale($src, $thumb, $dst, $output);
}
/**
* Scale the image by percentage
* @param string $src original image file
* @param string $dst input target file
* @param float/array $zoom zoom ratio, bloom by percentage when using floating point type. For array types, rows are scaled according to the specified size
* @param boolean $output Whether to generate file output
*/
public function scale($src, $dst=null, $zoom=1, $output=true)
{
if(!file_exists($src)) die('File not exists.');
if(!$zoom) die('the zoom undefine.');
$src_im = $this->IM($src);
$old_width = imagesx($src_im);
if( is_float($zoom)) {
//Zoom by percentage
$new_width = $old_width * $zoom;
}
elseif(is_array($zoom)) {
//Explicit zoom size
$new_width = $zoom[ 0];
}
//Whether the height of the zoom is defined
if(!isset($zoom[1])) {
//Scaling in equal proportions
$resize_im = $this->imageresize($src_im, $new_width );
}
else {
//Non-proportional scaling
$resize_im = $this->imageresize($src_im, $new_width, $zoom[1]);
}
if(!$output) {
header ("Content-type: image/jpeg");
imagejpeg($resize_im, null, $this->quality);
}
else {
$new_file = empty($dst)? $src:$dst;
imagejpeg($resize_im, $new_file, $this->quality);
}
imagedestroy($im);
imagedestroy($nIm);
}
/**
* Crop the picture
* @param $src original file
* @param $dst target file
* @param $output whether to generate the target file
*/
public function capture($src , $dst=null, $output=true) {
if(!file_exists($src)) die('File not exists.');
$width = $this->th_width;
$height = $this- >th_height;
$src_im = $this->IM($src);
$old_width = imagesx($src_im);
$old_height = imagesy($src_im);
$capture = imagecreatetruecolor($width, $height );
$rgb = explode(",", $this->background);
$white = imagecolorallocate($capture, $rgb[0], $rgb[1], $rgb[2]);
imagefill ($capture, 0, 0, $white);
//Resize when the image is larger than the thumbnail
if($old_width > $width && $old_height>$height) {
$resize_im = $this->imageresize ($src_im, $width);
//When the image proportion does not meet the standard, recalculate the proportion and crop it
if(imagesy($resize_im) < $height) {
$proportion = $old_height/$this->th_height ;
$resize_im = $this->imageresize($src_im, $old_width/$proportion);
}
$posx = 0;
$posy = 0;
}
else {
//When the image is smaller than the thumbnail, The image is displayed in the center
$posx = ($width-$old_width)/2;
$posy = ($height-$old_height)/2;
$resize_im = $src_im;
}
imagecopy($capture, $resize_im, $ posx, $posy, 0, 0, imagesx($resize_im), imagesy($resize_im));
if(!$output) {
header("Content-type: image/jpeg");
imagejpeg($capture, null, $this->quality);
}
else {
$new_file = empty($dst)? $src:$dst;
imagejpeg($capture, $new_file, $this->quality);
}
imagedestroy($src_im);
@imagedestroy($resize_im);
imagedestroy($capture);
}
/**
* Write watermark image
* @param $src Image that needs to be watermarked
* @param $mark Watermark image
* @param $transparent Watermark transparency
*/
public function mark($src, $mark, $dst='', $output=true)
{
$mark_info = getimagesize($mark);
$src_info = getimagesize($src);
list($mw,$mh) = $mark_info;
list($sw,$sh) = $src_info;
$px = $sw - $mw;
$py = $sh - $mh;
$im = $this->IM($src);
$mim = $this->IM($ mark);
imagecopymerge($im, $mim, $px, $py, 0, 0, $mw, $mh, $this->transparent);
if($output){
$new_file = empty($ dst)? $src:$dst;
imagejpeg($im, $new_file, $this->quality);
}
else
{
header('Content-type: image/jpeg');
imagejpeg($ im);
}
imagedestroy($im);
imagedestroy($mim);
}
/**
* Obtain different GD objects through files
*/
protected function IM($file)
{
if(!file_exists($file)) die('File not exists.');
$info = getimagesize($file);
switch($info['mime'])
{
case 'image/gif':
$mim = imagecreatefromgif($file);
break;
case 'image/png':
$mim = imagecreatefrompng($file);
imagealphablending($mim, false);
imagesavealpha($mim, true);
break;
case 'image/jpeg':
$mim = imagecreatefromjpeg($file);
break;
default:
die('File format errors.');
}
return $mim;
}
/**
* Processing of scaling pictures
* @param resource $src_im Image GD object
* @param integer $width Width of the picture
* @param integer $height Height of the picture, if the height is not set, the picture will be proportional Zoom
* @return resuorce $im returns a GD object
*/
protected function imageresize($src_im, $width, $height=null) {
$old_width = imagesx($src_im);
$old_height = imagesy($src_im);
$proportion = $old_width/$old_height;
$new_width = $width;
$new_height = is_null($height)? round($new_width / $proportion):$height;
//创建新的图象并填充默认的背景色
$im = imagecreatetruecolor($new_width, $new_height);
$rgb = explode(",", $this->background);
$white = imagecolorallocate($im, $rgb[0], $rgb[1], $rgb[2]);
imagefill($im, 0, 0, $white);
//对图片进行缩放
imagecopyresized($im, $src_im, 0, 0, 0, 0, $new_width, $new_height, $old_width, $old_height);
return $im;
}
/**
* Class variable assignment
*/
public function __set($key, $value)
{
$this->$key = $value;
}
/**
* Get class variable value
*/
public function __get($key)
{
return $this->$key;
}
}
?>

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