PHP生成图片缩略图方法及代码 (2)

{
        //改变后的图象的比例
         $resize_ratio = ( $this->resize_width)/( $this->resize_height);
        //实际图象的比例
         $ratio = ( $this->width)/( $this->height);
        if(( $this->cut)=="1")
        //裁图
        {
            if( $ratio>= $resize_ratio)
            //高度优先
            {
                 $newimg = imagecreatetruecolor( $this->resize_width, $this->resize_height);
                imagecopyresampled( $newimg,  $this->im, 0, 0, 0, 0,  $this->resize_width, $this->resize_height, (( $this->height)* $resize_ratio),  $this->height);
                ImageJpeg ( $newimg, $this->dstimg);
            }
            if( $ratio< $resize_ratio)
            //宽度优先
            {
                 $newimg = imagecreatetruecolor( $this->resize_width, $this->resize_height);
                imagecopyresampled( $newimg,  $this->im, 0, 0, 0, 0,  $this->resize_width,  $this->resize_height,  $this->width, (( $this->width)/ $resize_ratio));
                ImageJpeg ( $newimg, $this->dstimg);
            }
        }