分享php多功能图片处理类

本文实例为大家分享了多功能php图片处理类，供大家参考，具体内容如下

<?php
/**
 * Image.class.php 图像处理类
 * @author Administrator
 *
 */
class Image{ 

  private $path='';
  /**
   * 构造方法
   * @param unknown $path
   */
  function __construct($path=''){
    if (!empty($path)) {
      $this->path=$path;
    }
  }
  /**
   +-----------------------------------------------
   * 等比缩放函数
   +-----------------------------------------------
   * @param unknown $name 需处理图片的名称
   * @param unknown $width 缩放后的宽度
   * @param unknown $height 缩放后的高度
   * @param string $thumb_prixs 缩放后的前缀名
   * @return mixed $newname 返回的缩放后的文件名
   */
  function thumb($name,$width,$height,$thumb_prixs='th_'){
    //获取图片信息
    $Info=$this->ImageInfo($name); //图片的宽度，高度，类型
    //获取图片资源，各种类型的图片都可以创建资源，jpg,gif,png
    $imagres=$this->Img_resouce($name, $Info);
    //获取计算图片等比例之后的大小，
    $size=$this->getNewSize($name,$width,$height,$Info);
    //获取新的图片资源，处理透明背景
    $newimg=$this->getImage($imagres,$size,$Info);
    //另存为一个新的图片，返回新的缩放后的图片名称
    $newname=$this->SaveNewImage($newimg,$thumb_prixs.$name,$Info);
    return $newname;
  } 

  /**
   +-----------------------------------------------------------------------
   * 水印标记函数
   +-----------------------------------------------------------------------
   * @param unknown $backname  背景文件名
   * @param unknown $watername 水印文件名
   * @param number $waterpos  水印位置
   * @param string $wa_prixs  水印前缀名
   * @return boolean
   */
  function waterMark($backname,$watername,$waterpos=0,$wa_prixs='wa_') { 

    if (file_exists($this->path.$backname) && file_exists($this->path.$watername)) { 

      $backinfo=$this->ImageInfo($backname); 

      $waterinfo=$this->ImageInfo($watername); 

      if(!$pos=$this->getPos($backinfo, $waterinfo, $waterpos)){
        echo "水印图片不应该比背景图片小";
        return false;
      }
       $backimg=$this->Img_resouce($backname, $backinfo); 

       $waterimg=$this->Img_resouce($watername, $waterinfo);
       var_dump($backimg);exit();
       $backimg=$this->CopyImage($backimg, $waterimg, $pos, $waterinfo); 

       $this->SaveNewImage($backimg, $wa_prixs.$backname, $backinfo);
    }else{ 

      echo "图片或水印不存在";
      return false;
    }
  }
  /**
   +-----------------------------------------------------------------------
   * 获取图片信息函数
   +-----------------------------------------------------------------------
   * @param unknown $name
   * @return unknown
   */ 

   private function ImageInfo($img) {
    $imageInfo=getimagesize($img);
    if ($imageInfo!==false) {
      $imageType=strtolower(substr(image_type_to_extension($imageInfo[2]),1));
      $imageSize=filesize($img);
      $Info=array(
        "width" => $imageInfo[0],
        "height" => $imageInfo[1],
        "type" => $imageType,
        "size" => $imageSize,
        "mime" => $imageInfo['mime']
      );
      return $Info;
    }else{
      return false;
    }
  } 

  /**
   +--------------------------------------------------------
   * 创建原图像格式函数
   +--------------------------------------------------------
   * @param unknown $name
   * @param unknown $imaginfo
   * @return boolean|resource
   */
  private function Img_resouce($name,$imageinfo){
    $iamgeres=$this->path.$name;
    //var_dump($iamgeres);exit();
     switch ($imageinfo['type']) {
      case 'gif':
       $img=imagecreatefromgif($name);
         break;
      case 'jpg':
       $img=imagecreatefromjpeg($name);
         break;
      case 'png':
       $img=imagecreatefrompng($name);
         break;
     }
     return $img;
  }
  /**
   +--------------------------------------------------
   * 获取等比缩放尺寸函数
   +--------------------------------------------------
   * @param unknown $name
   * @param unknown $width
   * @param unknown $height
   * @param unknown $imaginfo
   * @return Ambigous <unknown, number>
   */
  private function getNewSize($name,$width,$height,$imaginfo){
       $size['width']=$imaginfo['width'];
       $size['height']=$imaginfo['height'];
    if ($width<$imaginfo['width']) {
      $size['width']=$width;
    }
    if ($height<$imaginfo['height']) {
      $size['height']=$height;
    }
    //图像等比例缩放算法
    if ($imaginfo['width']*$size['width']>$imaginfo['height']*$size['height']) {
      $size['height']=round($imaginfo['height']*$size['width']/$imaginfo['width']);
    }else{
      $size['width']=round($imaginfo['width']*$size['height']/$imaginfo['height']);
    }
    return $size;
  }
  private function getImage($imageres,$size,$imageinfo){
    //新建一个真彩色图像
    $newimg=imagecreatetruecolor($size['width'], $size['height']);
    //将某个颜色定义为透明色
    $otsc=imagecolortransparent($imageres);
    //获取图像的调色板的颜色数目
    if ($otsc>=0&&$otsc<=imagecolorstotal($imageres)) {
      //取得某索引的颜色
      $stran=imagecolorsforindex($imageres, $otsc);
      //为图像分配颜色
      $newt=imagecolorallocate($imageres, $stran['red'], $stran['green'], $stran['blue']);
      //区域填充函数
      imagefill($newimg, 0, 0, $newt);
      //为图像定义透明色
      imagecolortransparent($newimg,$newt);
    }
    imagecopyresized($newimg, $imageres, 0, 0, 0, 0, $size['width'], $size['height'], $imageinfo['width'], $imageinfo['height']);   

    imagedestroy($imageres); 

    return $newimg;
   }
   /**
    +----------------------------------------------
    *保存图像函数
    +----------------------------------------------
    * @param unknown $newimg
    * @param unknown $newname
    * @param unknown $imageinfo
    * @return unknown
    */
   private function SaveNewImage($newimg,$newname,$imageinfo){
    switch ($imageinfo['type']){
      case 1://gif
        $result=imagegif($newimg,$this->path.$newname);
        break;
      case 2://jpg
        $result=imagejpeg($newimg,$this->path.$newname);
        break;
      case 3://png
        $result=imagepng($newimg,$this->path.$newname);
        break;
    }
    imagedestroy($newimg);
    return $newname;
   } 

   /**
    +-----------------------------------------------------------------
    * 获取水印位置函数
    +-----------------------------------------------------------------
    * @param unknown $backinfo  背景信息
    * @param unknown $waterinfo  水印信息
    * @param unknown $waterpos  水印位置
    * @return boolean|multitype:number 返回坐标数组
    */
   private function getPos($backinfo,$waterinfo,$waterpos) { 

    if ($backinfo['width']<$waterinfo['width']||$backinfo['height']<$waterinfo['height']) {
      return false;
    }
    switch ($waterpos) { 

      case 1://左上角
        $posX=0;
        $posY=0;
         break;
      case 2://中上方
        $posX=$backinfo['width']-$waterinfo['width']/2;
        $posY=0;
         break;
      case 3://右上角
        $posX=$backinfo['width']-$waterinfo['width'];
        $posY=0;
         break;
      case 4://左中方
        $posX=0;
        $posY=$backinfo['height']-$waterinfo['height']/2;
         break;
      case 5://正中间
        $posX=$backinfo['width']-$waterinfo['width']/2;
        $posY=$backinfo['height']-$waterinfo['height']/2;
         break;
      case 6://右中方
        $posX=$backinfo['width']-$waterinfo['width'];
        $posY=$backinfo['height']-$waterinfo['height']/2;
         break;
      case 7://底部靠左
        $posX=0;
        $posY=$backinfo['height']-$waterinfo['height'];
         break;
      case 8://底部居中
        $posX=$backinfo['width']-$waterinfo['width']/2;
        $posY=$backinfo['height']-$waterinfo['height'];
         break;
      case 9://底部靠右
        $posX=$backinfo['width']-$waterinfo['width'];
        $posY=$backinfo['height']-$waterinfo['height'];
         break;
      case 0:
      default :
        $posX=rand(0,$backinfo['width']-$waterinfo['width']);
        $posY=rand(0,$backinfo['height']-$waterinfo['height']);
         break;
    }
    return array('posX'=>$posX,'posY'=>$posY);
   }
   /**
    +-------------------------------------------------------------------
    * 拷贝图像
    +-------------------------------------------------------------------
    * @param unknown $backimg   背景资源
    * @param unknown $waterimg  水印资源
    * @param unknown $pos     水印位置
    * @param unknown $waterinfo  水印信息
    * @return unknown
    */
   private function CopyImage($backimg,$waterimg,$pos,$waterinfo) { 

    imagecopy($backimg, $waterimg, $pos['posX'], $pos['posY'], 0, 0, $waterinfo['width'], $waterinfo['height']);
    imagedestroy($waterimg);
     return $backimg;
   } 

}
?> 

以上就是本文的全部内容，希望对大家学习PHP程序设计有所帮助。