PHP生成图片缩略图方法及代码 (3)

  else
        //不裁图
        {
            if( $ratio>= $resize_ratio)
            {
                 $newimg = imagecreatetruecolor( $this->resize_width,( $this->resize_width)/ $ratio);
                imagecopyresampled( $newimg,  $this->im, 0, 0, 0, 0,  $this->resize_width, ( $this->resize_width)/ $ratio,  $this->width,  $this->height);
                ImageJpeg ( $newimg, $this->dstimg);
            }
            if( $ratio< $resize_ratio)
            {
                 $newimg = imagecreatetruecolor(( $this->resize_height)* $ratio, $this->resize_height);
                imagecopyresampled( $newimg,  $this->im, 0, 0, 0, 0, ( $this->resize_height)* $ratio,  $this->resize_height,  $this->width,  $this->height);
                ImageJpeg ( $newimg, $this->dstimg);
            }
        }
    }
    //初始化图象
    function initi_img()
    {
        if( $this->type=="jpg")
        {
             $this->im = imagecreatefromjpeg( $this->srcimg);
        }
        if( $this->type=="gif")
        {