Chinaunix

标题: 图片缩放加水印的类 [打印本页]

作者: xrsf 时间: 2009-07-20 12:42
标题: 图片缩放加水印的类

?php
/**
* 作用：图片缩略
* 时间：2006-8-16 15:47
* 欣然随风
* 参数：
* @src_path -- 源图路径
* @new_path -- 新图路径
* @new_width -- 新图宽
* @new_height -- 新图高
* @on -- 是否裁图
* @is_sy -- 值'FALSE'不加水印,否则为数组：
* ['path'] -- 水印图地址
* ['set_x'] -- 横向：1|左 2|中 3|右
* ['set_y'] -- 竖向：1|上 2|中 3|下
*/
/*
$src_path = '1.jpg';
$new_path = 'f:\1.gif';
$new_width = '600';
$new_height='400';
$on = 1;
$is_sy = array('path'=>'2.gif','set_x'=> 3,'set_y'=> 3);
new class_img($src_path,$new_path,$new_width,$new_height,$on,$is_sy);
*/
class class_img
{
public $src_path;       // 源图路径
public $src_width;       // 源图宽
public $src_height;       // 源图高
public $new_path;       // 新图路径
public $new_width;       // 新图宽
public $new_height;       // 新图高
public $on;             // 是否裁图
public $im;             // 图像流
public $new_im;          // 新图像流
function __construct($src_path,$new_path,$new_width,$new_height,$on,$is_sy=FALSE)
{
      $this->src_path       = $src_path;
      $this->new_path       = $new_path;
      $this->new_width = $new_width;
      $this->new_height = $new_height;
      $this->on          = $on;
      $this->is_sy       = $is_sy;
      $this->img_gut($this->src_path);
      $this->img_new();
      if($is_sy) $this->img_sy(); // 加水印
      $this->img_echo();          // 输出
      ImageDestroy ($this->im);
      ImageDestroy ($this->new_im);
}
// 方法：取得源图
function img_gut($path)
{
      $type = substr($path,-3);
      if($type == 'jpg') $this->im = imagecreatefromjpeg($path);
      if($type == 'gif') $this->im = imagecreatefromgif($path);
      if($type == 'png') $this->im = imagecreatefrompng($path);
      $this->src_width = imagesx($this->im);
      $this->src_height = imagesy($this->im);
}
// 方法：输出新图
function img_echo()
{
      $type = substr($this->new_path,-3);
      if($type == 'jpg') imagejpeg($this->new_im,$this->new_path);
      if($type == 'gif') imagegif($this->new_im,$this->new_path);
      if($type == 'png') imagepng($this->new_im,$this->new_path);
}
// 方法：生成缩略图
function img_new()
{
      $new_ratio = $this->new_width/$this->new_height; // 新图比例
      $src_ratio = $this->src_width/$this->src_height; // 源图比例
      // 裁图
      if($this->on)
      {
         $this->new_im = imagecreatetruecolor($this->new_width,$this->new_height); // 新建一个真彩色图像
         //高度优先
         if($src_ratio >= $new_ratio)
         {
            imagecopyresampled($this->new_im,$this->im,0,0,0,0,$this->new_width,$this->new_height,$this->src_height*$new_ratio,$this->src_height);
         }
         //宽度优先
         if($src_ratio  $new_ratio)
         {
            imagecopyresampled($this->new_im,$this->im,0,0,0,0,$this->new_width,$this->new_height,$this->src_width,$this->src_width/$new_ratio);
         }
      }
      else
      //不裁图
      {
         if($src_ratio >= $new_ratio)
         {
            $this->new_im = imagecreatetruecolor($this->new_width,$this->new_width/$src_ratio);
            imagecopyresampled($this->new_im,$this->im,0,0,0,0,$this->new_width,$this->new_width/$src_ratio,$this->src_width,$this->src_height);
         }
         if($src_ratio  $new_ratio)
         {
            $this->new_im = imagecreatetruecolor($this->new_height*$src_ratio,$this->new_height);
            imagecopyresampled($this->new_im, $this->im,0,0,0,0,$this->new_height*$src_ratio,$this->new_height,$this->src_width,$this->src_height);
         }
      }
}
// 方法：生成水印
function img_sy()
{
      $this->img_gut($this->is_sy['path']);
      ImageAlphaBlending($this->im, true);
      switch($this->is_sy['set_x'])
      {
         case 1: $w = 0;                                           break;
         case 2: $w = $this->new_width/2 - $this->src_width/2; break;
         case 3: $w = $this->new_width - $this->src_width;       break;
      }
      switch($this->is_sy['set_y'])
      {
         case 1: $h = 0;                                           break;
         case 2: $h = $this->new_height/2 - $this->src_height/2; break;
         case 3: $h = $this->new_height - $this->src_height;       break;
      }
      imagecopy($this->new_im,$this->im,$w,$h,0,0,$this->src_width,$this->src_height); // 增加LOGO到缩略图中
}
}

本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u/12228/showart_2001218.html

欢迎光临 Chinaunix (http://bbs.chinaunix.net/)