用户选择缩放和裁剪位置

<?php // ------------------------------------------------------------------------ // 程序功能：用户选择缩放和裁剪位置，裁剪后自动保存成大图和中图和小图，一般用于网站头像设置 // 作者：徐风 （QQ：377653） // http://www.jieqi.com/ // ------------------------------------------------------------------------ $imgresize = new ImageResize(); //创建图片缩放和裁剪类 $imgresize->load('source.jpg'); //载入原始图片 $posary=explode(',', $_REQUEST['cut_pos']); foreach($posary as $k=>$v) $posary[$k]=intval($v); //获得缩放比例和裁剪位置 if($posary[2]>0 && $posary[3]>0) $imgresize->resize($posary[2], $posary[3]); //图片缩放 //保存120*120的大图 $imgresize->cut(120, 120, intval($posary[0]), intval($posary[1])); $imgresize->save('l.jpg'); //保存48*48的中图 $imgresize->resize(48, 48); $imgresize->save('m.jpg'); //保存16*16的小图 $imgresize->resize(16, 16); $imgresize->save('s.jpg', true); header('Location: index.html'); //-------------------------------------------------------- /** * 图片缩放和裁剪类 */ class ImageResize { //源图象 var $_img; //图片类型 var $_imagetype; //实际宽度 var $_width; //实际高度 var $_height; //载入图片 function load($img_name, $img_type=''){ if(!empty($img_type)) $this->_imagetype = $img_type; else $this->_imagetype = $this->get_type($img_name); switch ($this->_imagetype){ case 'gif': if (function_exists('imagecreatefromgif')) $this->_img=imagecreatefromgif($img_name); break; case 'jpg': $this->_img=imagecreatefromjpeg($img_name); break; case 'png': $this->_img=imagecreatefrompng($img_name); break; default: $this->_img=imagecreatefromstring($img_name); break; } $this->getxy(); } //缩放图片 function resize($width, $height, $percent=0) { if(!is_resource($this->_img)) return false; if(empty($width) && empty($height)){ if(empty($percent)) return false; else{ $width = round($this->_width * $percent); $height = round($this->_height * $percent); } }elseif(empty($width) && !empty($height)){ $width = round($height * $this->_width / $this->_height ); }else{ $height = round($width * $this->_height / $this->_width); } $tmpimg = imagecreatetruecolor($width,$height); if(function_exists('imagecopyresampled')) imagecopyresampled($tmpimg, $this->_img, 0, 0, 0, 0, $width, $height, $this->_width, $this->_height); else imagecopyresized($tmpimg, $this->_img, 0, 0, 0, 0, $width, $height, $this->_width, $this->_height); $this->destroy(); $this->_img = $tmpimg; $this->getxy(); } //裁剪图片 function cut($width, $height, $x=0, $y=0){ if(!is_resource($this->_img)) return false; if($width > $this->_width) $width = $this->_width; if($height > $this->_height) $height = $this->_height; if($x < 0) $x = 0; if($y < 0) $y = 0; $tmpimg = imagecreatetruecolor($width,$height); imagecopy($tmpimg, $this->_img, 0, 0, $x, $y, $width, $height); $this->destroy(); $this->_img = $tmpimg; $this->getxy(); } //显示图片 function display($destroy=true) { if(!is_resource($this->_img)) return false; switch($this->_imagetype){ case 'jpg': case 'jpeg': header("Content-type: image/jpeg"); imagejpeg($this->_img); break; case 'gif': header("Content-type: image/gif"); imagegif($this->_img); break; case 'png': default: header("Content-type: image/png"); imagepng($this->_img); break; } if($destroy) $this->destroy(); } //保存图片 $destroy=true 是保存后销毁图片变量，false这不销毁，可以继续处理这图片 function save($fname, $destroy=false, $type='') { if(!is_resource($this->_img)) return false; if(empty($type)) $type = $this->_imagetype; switch($type){ case 'jpg': case 'jpeg': $ret=imagejpeg($this->_img, $fname); break; case 'gif': $ret=imagegif($this->_img, $fname); break; case 'png': default: $ret=imagepng($this->_img, $fname); break; } if($destroy) $this->destroy(); return $ret; } //销毁图像 function destroy() { if(is_resource($this->_img)) imagedestroy($this->_img); } //取得图像长宽 function getxy() { if(is_resource($this->_img)){ $this->_width = imagesx($this->_img); $this->_height = imagesy($this->_img); } } //获得图片的格式，包括jpg,png,gif function get_type($img_name)//获取图像文件类型 { if (preg_match("/\.(jpg|jpeg|gif|png)$/i", $img_name, $matches)){ $type = strtolower($matches[1]); }else{ $type = "string"; } return $type; } } ?>