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

path=$path; 
    } 
  } 
   
  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;  
  } 
   
   
  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; 
    } 
  } 
   
   
   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; 
    }   
  } 
   
   
   
  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; 
  } 
   
  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;  
   } 
    
   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; 
   } 
    
    
   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); 
   } 
    
   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。