image.php

a short sketch about linux syntex lines.

<?php
/*
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website:http://www.vodcms.com/
QQ:24498936
MSN:[e-mail]
Version:6
*/
class Easy_Image {
	private  $image;
	public $dir;
	public $basedir;
	public $imageresize;
	static public $error;
	static public $errno;
	/*
	生成图片缩略图类方法
	@param string 文件名称
	@param int 生成图片的最大宽度
	@param int 生成图片的最大高度
	return string 返回生成后的新图片地址
	*/
	public function  reSize($filename, $width=0, $height=0){

		if ( !preg_match('/http:\/\/(.+?)/', $filename) && $this->imageresize === true ){	//非远程图片时
			$IO = new Easy_Filesystem($this->dir);
			$filename = substr($filename, strlen($this->basedir));
			$resizefile = 'upload/resize/'.date('Y/m/d').'/'.$width.'X'.$height.basename($filename);
			if (file_exists($this->dir.$resizefile)){	//如果缩略图已经存在
				return $this->basedir.$resizefile;
			}
			if (is_file($this->dir.$filename) && $width>0 && $height>0){	//图片文件存在
				list($srcWidth, $srcHeight, $type) = getimagesize($this->dir.$filename);
				if ($srcWidth && $srcHeight){
					$perX = $width / $srcWidth;	//缩放宽比率
					$perY = $height / $srcHeight;	//高度缩放比率
					$maxXY = min($perX, $perY);	//去比率最小的值
					$targetWidth = $srcWidth * $maxXY;	//目标宽
					$targetHeight = $srcHeight * $maxXY;	//目标高
					if($targetWidth<$width){
						$x=($width-$targetWidth) / 2;
					}else{
						$x=0;
					}
					if($targetHeight<$height){
						$y=($height-$targetHeight) / 2;
					}else{
						$y=0;
					}
					$image1 = imagecreatetruecolor($width, $height);	//建立一个画布
					$color = imagecolorallocate($image1, 255, 255, 255);	//填充背景色
					imagefill($image1, 0, 0, $color);
					$image = self::openImage($this->dir.$filename);	//gif
					if (is_resource($image)){
						imagecopyresampled($image1, $image, $x, $y, 0, 0, $targetWidth, $targetHeight, $srcWidth, $srcHeight);
						$IO->makedir(dirname($resizefile));
						imagejpeg($image1, $this->dir.$resizefile, 100);
						imagedestroy($image1);
						imagedestroy($image);
						return  $this->basedir.$resizefile;
					}else{
						return $filename;
					}
				}else{
					return $filename;
				}
				
			}else {
				$this->error = ('文件不存在!');
				return $filename;
			}
		}else{
			return $filename;
		}
	}
	/*
	返回资源对象
	*/
	private static function openImage($filename){
		if (is_file($filename)){
			$type = getimagesize($filename);
			switch($type[2]){
				case 1:
					$image = imagecreatefromgif( $filename );	//gif
				break;
				case 2:
					$image = imagecreatefromjpeg( $filename );
				break;
				case 3:
					$image = imagecreatefrompng( $filename );
				break;
				default:
					self::$error = '图片不是允许的类型';
					self::$errno = 1;
					return false;
				break;		
			}
			return $image;
		}
	}
}
?>