本文实例讲述了摘自织梦CMS中的图片处理类。分享给大家供大家参考。具体如下：

<?php if(!defined('DEDEINC')) exit('dedecms');
/**
 * 图像处理类
 *
 * @version  $Id: image.class.php 1 18:10 2010年7月5日Z tianya $
 * @package  DedeCMS.Libraries
 * @copyright  Copyright (c) 2007 - 2010, DesDev, Inc.
 * @license  http://help.dedecms.com/usersguide/license.html
 * @link   http://www.dedecms.com
 */
class image
{
 var $attachinfo;
 var $targetfile; //图片路径
 var $imagecreatefromfunc;
 var $imagefunc;
 var $attach;
 var $animatedgif;
 var $watermarkquality;
 var $watermarktext;
 var $thumbstatus;
 var $watermarkstatus;
 // 析构函数,兼容PHP4
 function image($targetfile, $cfg_thumb, $cfg_watermarktext, $photo_waterpos, $photo_diaphaneity, $photo_wheight, $photo_wwidth, $cfg_watermarktype, $photo_marktrans,$trueMarkimg, $attach = array())
 {
  $this->__construct($targetfile, $cfg_thumb, $cfg_watermarktext, $photo_waterpos, $photo_diaphaneity, $photo_wheight, $photo_wwidth, $cfg_watermarktype, $photo_marktrans,$trueMarkimg, $attach);
 }
 // 析构函数
 function __construct($targetfile, $cfg_thumb, $cfg_watermarktext, $photo_waterpos, $photo_diaphaneity, $photo_wheight, $photo_wwidth, $cfg_watermarktype, $photo_marktrans,$trueMarkimg, $attach = array())
 {
  $this->thumbstatus = $cfg_thumb;
  $this->watermarktext = $cfg_watermarktext;
  $this->watermarkstatus = $photo_waterpos;
  $this->watermarkquality = $photo_marktrans;
  $this->watermarkminwidth = $photo_wwidth;
  $this->watermarkminheight = $photo_wheight;
  $this->watermarktype = $cfg_watermarktype;
  $this->watermarktrans = $photo_diaphaneity;
  $this->animatedgif = 0;
  $this->targetfile = $targetfile;
  $this->attachinfo = @getimagesize($targetfile);
  $this->attach = $attach;
  switch($this->attachinfo['mime'])
  {
   case 'image/jpeg':
    $this->imagecreatefromfunc = function_exists('imagecreatefromjpeg') ? 'imagecreatefromjpeg' : '';
    $this->imagefunc = function_exists('imagejpeg') ? 'imagejpeg' : '';
    break;
   case 'image/gif':
    $this->imagecreatefromfunc = function_exists('imagecreatefromgif') ? 'imagecreatefromgif' : '';
    $this->imagefunc = function_exists('imagegif') ? 'imagegif' : '';
    break;
   case 'image/png':
    $this->imagecreatefromfunc = function_exists('imagecreatefrompng') ? 'imagecreatefrompng' : '';
    $this->imagefunc = function_exists('imagepng') ? 'imagepng' : '';
    break;
  }//为空则匹配类型的函数不存在
  $this->attach['size'] = empty($this->attach['size']) ? @filesize($targetfile) : $this->attach['size'];
  if($this->attachinfo['mime'] == 'image/gif')
  {
   $fp = fopen($targetfile, 'rb');
   $targetfilecontent = fread($fp, $this->attach['size']);
   fclose($fp);
   $this->animatedgif = strpos($targetfilecontent, 'NETSCAPE2.0') === false ? 0 : 1;
  }
 }
 /**
  * 生成缩略图
  *
  * @access public
  * @param  int $thumbwidth 图片宽度
  * @param  int $thumbheight 图片高度
  * @param  int $preview 是否预览
  * @return void
  */
 function thumb($thumbwidth, $thumbheight, $preview = 0)
 {
  $this->thumb_gd($thumbwidth, $thumbheight, $preview);
 
  if($this->thumbstatus == 2 && $this->watermarkstatus)
  {
   $this->image($this->targetfile, $this->attach);
   $this->attach['size'] = filesize($this->targetfile);
  }
 }
 /**
  * 图片水印
  *
  * @access public
  * @param  int $preview 是否预览
  * @return void
  */
 function watermark($preview = 0)
 {
  if($this->watermarkminwidth && $this->attachinfo[0] <= $this->watermarkminwidth && $this->watermarkminheight && $this->attachinfo[1] <= $this->watermarkminheight)
  {
   return ;
  }
  $this->watermark_gd($preview);
 }
 /**
  * 使用gd生成缩略图
  *
  * @access public
  * @param  int $thumbwidth 图片宽度
  * @param  int $thumbheight 图片高度
  * @param  int $preview 是否预览
  * @return void
  */
 function thumb_gd($thumbwidth, $thumbheight, $preview = 0)
 {
  if($this->thumbstatus && function_exists('imagecreatetruecolor') && function_exists('imagecopyresampled') && function_exists('imagejpeg'))
  {
   $imagecreatefromfunc = $this->imagecreatefromfunc;
   $imagefunc = $this->thumbstatus == 1 ? 'imagejpeg' : $this->imagefunc;
   list($imagewidth, $imageheight) = $this->attachinfo;
   if(!$this->animatedgif && ($imagewidth >= $thumbwidth || $imageheight >= $thumbheight))
   {
    $attach_photo = $imagecreatefromfunc($this->targetfile);
    $x_ratio = $thumbwidth / $imagewidth;
    $y_ratio = $thumbheight / $imageheight;
    if(($x_ratio * $imageheight) < $thumbheight)
    {
     $thumb['height'] = ceil($x_ratio * $imageheight);
     $thumb['width'] = $thumbwidth;
    }
    else
    {
     $thumb['width'] = ceil($y_ratio * $imagewidth);
     $thumb['height'] = $thumbheight;
    }
    $targetfile = !$preview ? ($this->thumbstatus == 1 ? $this->targetfile.'.thumb.jpg' : $this->targetfile) : './watermark_tmp.jpg';
    $thumb_photo = imagecreatetruecolor($thumb['width'], $thumb['height']);
    imagecopyresampled($thumb_photo, $attach_photo, 0, 0, 0, 0, $thumb['width'], $thumb['height'], $imagewidth, $imageheight);
    if($this->attachinfo['mime'] == 'image/jpeg')
    {
     $imagefunc($thumb_photo, $targetfile, 100);
    }
    else
    {
     $imagefunc($thumb_photo, $targetfile);
    }
    $this->attach['thumb'] = $this->thumbstatus == 1 ? 1 : 0;
   }
  }
 }
 /**
  * 使用gd进行水印
  *
  * @access public
  * @param  int $preview 是否预览
  * @return void
  */
 function watermark_gd($preview = 0)
 {
  if($this->watermarkstatus && function_exists('imagecopy') && function_exists('imagealphablending') && function_exists('imagecopymerge'))
  {
   $imagecreatefunc = $this->imagecreatefromfunc;
   $imagefunc = $this->imagefunc;
   list($imagewidth, $imageheight) = $this->attachinfo;
   if($this->watermarktype < 2)
   {
    $watermark_file = $this->watermarktype == 1 ? DEDEDATA.'/mark/mark.png' : DEDEDATA.'/mark/mark.gif';
    $watermarkinfo = @getimagesize($watermark_file);
    $watermark_logo = $this->watermarktype == 1 ? @imagecreatefrompng($watermark_file) : @imagecreatefromgif($watermark_file);
    if(!$watermark_logo)
    {
     return ;
    }
    list($logowidth, $logoheight) = $watermarkinfo;
   }
   else
   {
    $box = @imagettfbbox($this->watermarktext['size'], $this->watermarktext['angle'], $this->watermarktext['fontpath'],$this->watermarktext['text']);
    $logowidth = max($box[2], $box[4]) - min($box[0], $box[6]);
    $logoheight = max($box[1], $box[3]) - min($box[5], $box[7]);
    $ax = min($box[0], $box[6]) * -1;
    $ay = min($box[5], $box[7]) * -1;
   }
   $wmwidth = $imagewidth - $logowidth;
   $wmheight = $imageheight - $logoheight;
   if(($this->watermarktype < 2 && is_readable($watermark_file) || $this->watermarktype == 2) && $wmwidth > 10 && $wmheight > 10 && !$this->animatedgif)
   {
    switch($this->watermarkstatus)
    {
     case 1:
 
      $x = +5;
      $y = +5;
      break;
     case 2:
      $x = ($imagewidth - $logowidth) / 2;
      $y = +5;
      break;
     case 3:
      $x = $imagewidth - $logowidth - 5;
      $y = +5;
      break;
     case 4:
      $x = +5;
      $y = ($imageheight - $logoheight) / 2;
      break;
     case 5:
      $x = ($imagewidth - $logowidth) / 2;
      $y = ($imageheight - $logoheight) / 2;
      break;
     case 6:
      $x = $imagewidth - $logowidth - 5;
      $y = ($imageheight - $logoheight) / 2;
      break;
     case 7:
      $x = +5;
      $y = $imageheight - $logoheight - 5;
      break;
     case 8:
      $x = ($imagewidth - $logowidth) / 2;
      $y = $imageheight - $logoheight - 5;
      break;
     case 9:
      $x = $imagewidth - $logowidth - 5;
      $y = $imageheight - $logoheight -5;
      break;
    }
    $dst_photo = @imagecreatetruecolor($imagewidth, $imageheight);
    $target_photo = $imagecreatefunc($this->targetfile);
    imagecopy($dst_photo, $target_photo, 0, 0, 0, 0, $imagewidth, $imageheight);
    if($this->watermarktype == 1)
    {
     imagecopy($dst_photo, $watermark_logo, $x, $y, 0, 0, $logowidth, $logoheight);
    }
    elseif($this->watermarktype == 2)
    {
     if(($this->watermarktext['shadowx'] || $this->watermarktext['shadowy']) && $this->watermarktext['shadowcolor'])
     {
      $shadowcolorrgb = explode(',', $this->watermarktext['shadowcolor']);
      $shadowcolor = imagecolorallocate($dst_photo, $shadowcolorrgb[0], $shadowcolorrgb[1], $shadowcolorrgb[2]);
      imagettftext($dst_photo, $this->watermarktext['size'], $this->watermarktext['angle'],
      $x + $ax + $this->watermarktext['shadowx'], $y + $ay + $this->watermarktext['shadowy'], $shadowcolor,
      $this->watermarktext['fontpath'], $this->watermarktext['text']);
     }
     $colorrgb = explode(',', $this->watermarktext['color']);
     $color = imagecolorallocate($dst_photo, $colorrgb[0], $colorrgb[1], $colorrgb[2]);
     imagettftext($dst_photo, $this->watermarktext['size'], $this->watermarktext['angle'],
     $x + $ax, $y + $ay, $color, $this->watermarktext['fontpath'], $this->watermarktext['text']);
    }
    else
    {
     imagealphablending($watermark_logo, true);
     imagecopymerge($dst_photo, $watermark_logo, $x, $y, 0, 0, $logowidth, $logoheight, $this->watermarktrans);
    }
    $targetfile = !$preview ? $this->targetfile : './watermark_tmp.jpg';
    if($this->attachinfo['mime'] == 'image/jpeg')
    {
     $imagefunc($dst_photo, $targetfile, $this->watermarkquality);
    }
    else
    {
     $imagefunc($dst_photo, $targetfile);
    }
    $this->attach['size'] = filesize($this->targetfile);
   }
  }
 }
}//End Class

希望本文所述对大家的php程序设计有所帮助。