195 lines
4.8 KiB
PHP
195 lines
4.8 KiB
PHP
<?php
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/**
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* 第三方，乐仁
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* 图片缩放和裁剪类
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*/
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namespace Org\Util;
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class ImageResize
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{
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//源图象
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var $_img;
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//图片类型
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var $_imagetype;
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//实际宽度
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var $_width;
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//实际高度
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var $_height;
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//载入图片
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public function load($img_name, $img_type=''){
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if(!empty($img_type)) $this->_imagetype = $img_type;
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else $this->_imagetype = $this->get_type($img_name);
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switch ($this->_imagetype){
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case 'gif':
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if (function_exists('imagecreatefromgif')) $this->_img=imagecreatefromgif($img_name);
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break;
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case 'jpg':
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$this->_img=@imagecreatefromjpeg($img_name);
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break;
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case 'png':
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$this->_img=@imagecreatefrompng($img_name);
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imagesavealpha($this->_img,true);
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break;
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default:
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$this->_img=@imagecreatefromstring($img_name);
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break;
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}
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$this->getxy();
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if(is_resource($this->_img)) return true;
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}
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//缩放图片
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public function resize($width=0, $height=0)
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{
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if(!is_resource($this->_img)) return false;
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if($width>0 and $height>0)
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{
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$height2 = round($width * $this->_height / $this->_width );
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if($height < $height2){
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$height = $height2;
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}else{
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$width = round($height * $this->_width / $this->_height);
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}
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}elseif($width>0){
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$height = round($width * $this->_height / $this->_width );
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}elseif($height>0){
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$width = round($height / $this->_width * $this->_height);
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}
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$tmpimg = imagecreatetruecolor($width,$height);
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if($this->_imagetype=='png'){
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imagealphablending($tmpimg,false);//这里很重要,意思是不合并颜色,直接用$img图像颜色替换,包括透明色;
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imagesavealpha($tmpimg,true);//这里很重要,意思是不要丢了$tmpimg图像的透明色;
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}
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if(function_exists('imagecopyresampled')) imagecopyresampled($tmpimg, $this->_img, 0, 0, 0, 0, $width, $height, $this->_width, $this->_height);
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else imagecopyresized($tmpimg, $this->_img, 0, 0, 0, 0, $width, $height, $this->_width, $this->_height);
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$this->destroy();
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$this->_img = $tmpimg;
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$this->getxy();
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}
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//裁剪图片
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public function cut($width, $height, $x=0, $y=0){
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if(!is_resource($this->_img)) return false;
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if($height==0){
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$height = round($width * $this->_height / $this->_width );
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}elseif($width==0)
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{
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$width = round($height / $this->_width * $this->_height);
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}
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if($width > $this->_width){
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if($x==0) $x =($width-$this->_width)/2;
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}elseif($width != $this->_width){
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if($x==0) $x =($this->_width-$width)/2;
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}
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if($height > $this->_height){
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if($y==0) $y =($height-$this->_height)/2;
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}elseif($height != $this->_height)
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{
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if($y==0) $y = ($this->_height-$height)/2;
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}
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$tmpimg = imagecreatetruecolor($width,$height);
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if($this->_imagetype=='png'){
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imagealphablending($tmpimg,false);//这里很重要,意思是不合并颜色,直接用$img图像颜色替换,包括透明色;
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imagesavealpha($tmpimg,true);//这里很重要,意思是不要丢了$tmpimg图像的透明色;
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}
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imagecopy($tmpimg, $this->_img, 0, 0, $x, $y, $width, $height);
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$this->destroy();
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$this->_img = $tmpimg;
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$this->getxy();
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}
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//显示图片
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public function display($destroy=1)
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{
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if(!is_resource($this->_img)) return false;
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switch($this->_imagetype){
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case 'jpg':
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case 'jpeg':
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header("Content-type: image/jpeg");
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imagejpeg($this->_img);
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break;
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case 'gif':
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header("Content-type: image/gif");
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imagegif($this->_img);
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break;
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case 'png':
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default:
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header("Content-type: image/png");
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imagepng($this->_img);
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break;
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}
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if($destroy) $this->destroy();
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}
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//保存图片 $destroy=1 是保存后销毁图片变量，false这不销毁，可以继续处理这图片
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public function save($fname, $destroy=false, $type='' , $zl=100)
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{
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if(!is_resource($this->_img)) return false;
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if(empty($type)) $type = $this->_imagetype;
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switch($type){
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case 'jpg':
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case 'jpeg':
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$ret=imagejpeg($this->_img, $fname,$zl);
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break;
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case 'gif':
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$ret=imagegif($this->_img, $fname);
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break;
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case 'png':
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default:
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$ret=imagepng($this->_img, $fname);
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break;
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}
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if($destroy) $this->destroy();
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return $ret;
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}
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//旋转图片
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public function rotate($rotate)
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{
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if(!is_resource($this->_img)) return false;
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$this->_img=imagerotate($this->_img, $rotate , 0);
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}
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//销毁图像
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public function destroy()
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{
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if(is_resource($this->_img)) imagedestroy($this->_img);
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}
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//取得图像长宽
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public function getxy()
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{
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if(is_resource($this->_img)){
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$this->_width = imagesx($this->_img);
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$this->_height = imagesy($this->_img);
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}
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}
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//获得图片的格式，包括jpg,png,gif
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public function get_type($img_name)//获取图像文件类型
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{
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if (preg_match("/\.(jpg|jpeg|gif|png)$/i", $img_name, $matches)){
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$type = strtolower($matches[1]);
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}else{
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$type = "string";
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}
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return $type;
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}
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}
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?>
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