<?php
class ImageResize {
	
	public function setSize($origin,$target,$cut_width,$cut_height,$start_x,$start_y,$new_width,$new_height,$ext){
		ini_set("memory_limit","1000M");
		$new=imagecreatetruecolor($new_width,$new_height);
		if($ext=='jpg'){
			$source=imagecreatefromjpeg($origin);
		}else{
			$source=imagecreatefrompng($origin);
			imagesavealpha($source,true);
			imagealphablending($new,false);
			imagesavealpha($new,true);
		}
		imagecopyresampled($new,$source,0,0,$start_x,$start_y,$new_width,$new_height,$cut_width,$cut_height);
		if($ext=='jpg'){
			imagejpeg($new,$target,90);	
		}else{
			imagepng($new,$target);	
		}		
		if(file_exists($target)){
			chmod($target,0777);
			return $target;
		}
		return false;
	}
	
	public function getSize($origin,$type=null) {
		$sizes=getimagesize($origin);
		if(is_null($type)){
			return array($sizes[0],$sizes[1]);
		}
		return $sizes[$type];
	}	
	
	public function resize($data, $thumb = false){

		$origin = $data['origin'];//原图片路径
		$targets = $data['targets'];//目标图片集参数
		$ext = substr($origin, -3);//图片后缀
		
		foreach ($targets as $key=>$value){
			$new_width = $value['width'];
			$new_height = $value['height'];
			$target = $value['target'];
			
			if($thumb || $origin == $target) {
				$start_x = 0;
				$start_y = 0;
				$cut_width = $this->getSize($origin,0);
				$cut_height = $this->getSize($origin,1);				
			}else {
				$start_x = $data['x'];//剪切起点x坐标
				$start_y = $data['y'];//剪切起点y坐标	
				$cut_width = $data['w'];//剪切宽度
				$cut_height = $data['h'];//剪切高度					
			}
			
			$return = $this->setSize($origin,$target,$cut_width,$cut_height,$start_x,$start_y,$new_width,$new_height,$ext);
			if(!$return){
				break;
			}
		}
		return $return;
	}
}
?>