PHP生成等比缩略图类和自定义函数分享

只看该作者 · 发表于 2018-2-14 05:56:59

共有两种等比例缩略图方法可以借鉴
一、为类文件，实例化之后即可使用
二、为自定义方法，比较轻巧
类文件
[U]复制代码[/U] 代码如下

resizeimage = new resizeimage("./shawn.jpg", "200", "100", "0","../pic/shawnsun.jpg");
//实例化下面的类,就能生成缩略图
//其中,源文件和缩略图地址可以相同,200,100分别代表宽和高，第四个参数为可选 0不截图，1为截图
[U]复制代码[/U] 代码如下:src$img;
      $this->resize_width = $wid;
      $this->resize_height = $hei;
      $this->cut = $c;

      //图片的类型
      $this->type = strtolower(substr(strrchr($this->srcimg,"."),1));
      //初始化图象
      $this->initi_img();
      //目标图象地址
      $this->dst_img($dstpath);
      //W & H
      $this->width  = imagesx($this->im);
      $this->height = imagesy($this->im);
      //生成图象
      $this->newimg();
      ImageDestroy ($this->im);
   }

function newimg(){

      //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
         {
            $new($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,$this->dstimg);
         }
         if($ratioresize_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,$this->dstimg);
         }
            }
      else
      //不裁图
      {
         if($ratio>=$resize_ratio)
         {
            $new($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,$this->dstimg);
         }
         if($ratioresize_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")
      {
         $this->im = imagecreatefromgif($this->srcimg);
      }
      if($this->type=="png")
      {
         $this->im = imagecreatefrompng($this->srcimg);
      }
}
//图象目标地址
function dst_img($dstpath){

      $full_length  = strlen($this->srcimg);
      $type_length  = strlen($this->type);
      $name_length  = $full_length-$type_length;

      $name = substr($this->srcimg,0,$name_length-1);
      $this->dst$dstpath;

      //echo $this->dstimg;
}
}

?>
自定义方法
[U]复制代码[/U] 代码如下:
thumbs('shawn.jpg','shawnsun.jpg',100,100);
//参数属性类似于方法一
[U]复制代码[/U] 代码如下:
0){
      $nh = $nh +(($nh/$nw) * ($SetW-$nw));
      echo "*需补宽".($SetW-$nw).",陪补高".(($nh/$nw) * ($SetW-$nw))."
";
      $nw = $SetW;
}
//补高
if($SetH-$nh > 0){
      $nw = $nw + (($nw/$nh) * ($SetH-$nh));
      echo "*需补高".($SetH-$nh).",陪补宽". (($nw/$nh) * ($SetH-$nh)) ."
";
      $nh = $SetH;
}
$nw = intval($nw);
$nh = intval($nh);
echo "+修正大小：w$nw,h$nh
";

$px = ($SetW - $nw)/2;
$py = ($SetH - $nh)/2;
echo "窗口大小：w$SetW,h$SetH
";
echo "+偏移修正：x$px,y$py
";

$NewPhoto=imagecreatetruecolor($SetW,$SetH);
imagecopyresized($NewPhoto,$ThisPhoto,$px,$py,0,0,$nw,$nh,$width,$height);
ImageJpeg ($NewPhoto,$SaveTo);
return true;
}

?>


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