php 图片处理类_PHP教程

    class Image { 
        private $path; 
        //构造方法用来对图片所在位置进行初使化  
        function __construct($path="./"){ 
            $this->path=rtrim($path, "/")."/"; 
        } 
        /* 对图片进行缩放
         *
         * 参数$name: 是需要处理的图片名称
         * 参数$width:是缩放后的宽度
         * 参数$height:是缩放后的高度
         * 参数$qz: 是新图片的名称前缀
         * 返回值:就是缩放后的图片名称，失败则返回false
         *
         */ 
        function thumb($name, $width, $height, $qz="th_"){ 
            //获取图片信息  
            $imgInfo=$this->getInfo($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  
            $srcImg=$this->getImg($name, $imgInfo); 
            //获取计算图片等比例之后的大小, $size["width"], $size["height"]  
            $size=$this->getNewSize($name, $width, $height, $imgInfo); 
            //获取新的图片资源, 处理一下gif透明背景  
            $newImg=$this->kidOfImage($srcImg, $size, $imgInfo); 
            //另存为一个新的图片，返回新的缩放后的图片名称      
            return $this->createNewImage($newImg, $qz.$name, $imgInfo);   
        } 
 
        private function createNewImage($newImg, $newName, $imgInfo){ 
            switch($imgInfo["type"]){ 
                case 1://gif  
                    $result=imageGif($newImg, $this->path.$newName); 
                    break; 
                case 2://jpg  
                    $result=imageJPEG($newImg, $this->path.$newName); 
                    break; 
                case 3://png  
                    $return=imagepng($newImg, $this->path.$newName); 
                    break; 
            } 
            imagedestroy($newImg); 
            return $newName; 
        } 
 
        private function kidOfImage($srcImg, $size, $imgInfo){ 
            $newImg=imagecreatetruecolor($size["width"], $size["height"]); 
             
            $otsc=imagecolortransparent($srcImg); 
 
            if($otsc >=0 && $otsc                 $tran=imagecolorsforindex($srcImg, $otsc); 
 
                $newt=imagecolorallocate($newImg, $tran["red"], $tran["green"], $tran["blue"]); 
 
                imagefill($newImg, 0, 0, $newt); 
 
                imagecolortransparent($newImg, $newt); 
            } 
 
            imagecopyresized($newImg, $srcImg, 0, 0, 0, 0, $size["width"], $size["height"], $imgInfo["width"], $imgInfo["height"]); 
 
            imagedestroy($srcImg); 
 
            return $newImg; 
        } 
 
        private function getNewSize($name, $width, $height, $imgInfo){ 
            $size["width"]=$imgInfo["width"]; 
            $size["height"]=$imgInfo["height"]; 
 
            //缩放的宽度如果比原图小才重新设置宽度  
            if($width                 $size["width"]=$width; 
            } 
            //缩放的高度如果比原图小才重新设置高度  
            if($height                 $size["height"]=$height; 
            } 
 
            //图片等比例缩放的算法  
            if($imgInfo["width"]*$size["width"] > $imgInfo["height"] * $size["height"]){ 
                $size["height"]=round($imgInfo["height"]*$size["width"]/$imgInfo["width"]); 
            }else{ 
                $size["width"]=round($imgInfo["width"]*$size["height"]/$imgInfo["height"]); 
            } 
 
 
            return $size; 
 
        } 
 
        private function getInfo($name){ 
            $data=getImageSize($this->path.$name); 
 
            $imageInfo["width"]=$data[0]; 
            $imageInfo["height"]=$data[1]; 
            $imageInfo["type"]=$data[2]; 
 
            return $imageInfo; 
        } 
 
        private function getImg($name, $imgInfo){ 
            $srcPic=$this->path.$name; 
 
            switch($imgInfo["type"]){ 
                case 1: //gif  
                    $img=imagecreatefromgif($srcPic); 
                    break; 
                case 2: //jpg  
                    $img=imageCreatefromjpeg($srcPic); 
                    break; 
                case 3: //png  
                    $img=imageCreatefrompng($srcPic); 
                    break; 
                default: 
                    return false; 
                 
            } 
 
            return $img; 
        } 
        /* 功能：为图片加水印图片
         * 参数$groundName: 背景图片，即需要加水印的图片
         * 参数$waterName: 水钱图片
         * 参数#aterPost：水印位置， 10种状态， 
         *  0为随机位置
         *
         *  1. 为顶端居左  2. 为顶端居中  3 为顶端居右
         *  4  为中部居左  5. 为中部居中  6 为中部居右
         *  7 . 为底端居左 8. 为底端居中， 9. 为底端居右
         *
         * 参数$qz : 是加水印后的图片名称前缀
         * 返回值：就是处理后图片的名称
         *
         */ 
        function waterMark($groundName, $waterName, $waterPos=0, $qz="wa_"){ 
         
            if(file_exists($this->path.$groundName) && file_exists($this->path.$waterName)){ 
                $groundInfo=$this->getInfo($groundName); 
                $waterInfo=$this->getInfo($waterName); 
                //水印的位置  
                if(!$pos=$this->position($groundInfo, $waterInfo, $waterPos)){ 
                    echo "水印不应该比背景图片小！"; 
                    return; 
                } 
 
                $groundImg=$this->getImg($groundName, $groundInfo); 
                $waterImg=$this->getImg($waterName, $waterInfo); 
 
                $groundImg=$this->copyImage($groundImg, $waterImg, $pos, $waterInfo); 
 
                return $this->createNewImage($groundImg, $qz.$groundName, $groundInfo); 
            }else{ 
                echo "图片或水印图片不存在"; 
                return false; 
            } 
        } 
 
        private function copyImage($groundImg, $waterImg, $pos, $waterInfo){ 
            imagecopy($groundImg, $waterImg, $pos["posX"], $pos["posY"], 0, 0, $waterInfo["width"], $waterInfo["height"]); 
            imagedestroy($waterImg); 
 
            return $groundImg; 
        } 
         
        private function position($groundInfo, $waterInfo, $waterPos){ 
            //需要背景比水印图片大  
            if(($groundInfo["width"]                 return false; 
            } 
 
            switch($waterPos){ 
                case 1: 
                    $posX=0; 
                    $posY=0; 
                    break; 
                case 2: 
                    $posX=($groundInfo["width"]-$waterInfo["width"])/2; 
                    $posY=0; 
                    break; 
                case 3: 
                    $posX=$groundInfo["width"]-$waterInfo["width"]; 
                    $posY=0; 
                    break; 
                case 4: 
                    $posX=0; 
                    $posY=($groundInfo["height"]-$waterInfo["height"]) /2; 
                    break; 
                case 5: 
                    $posX=($groundInfo["width"]-$waterInfo["width"])/2; 
                    $posY=($groundInfo["height"]-$waterInfo["height"]) /2; 
                    break; 
                case 6: 
                    $posX=$groundInfo["width"]-$waterInfo["width"]; 
                    $posY=($groundInfo["height"]-$waterInfo["height"]) /2; 
                    break; 
                case 7: 
                    $posX=0; 
                    $posY=$groundInfo["height"]-$waterInfo["height"]; 
                    break; 
                case 8: 
                    $posX=($groundInfo["width"]-$waterInfo["width"])/2; 
                    $posY=$groundInfo["height"]-$waterInfo["height"]; 
                    break; 
                case 9: 
                    $posX=$groundInfo["width"]-$waterInfo["width"]; 
                    $posY=$groundInfo["height"]-$waterInfo["height"]; 
                    break; 
                case 0: 
                default: 
                    $posX=rand(0, ($groundInfo["width"]-$waterInfo["width"])); 
                    $posY=rand(0, ($groundInfo["height"]-$waterInfo["height"])); 
                    break; 
            } 
 
            return array("posX"=>$posX, "posY"=>$posY); 
        } 
 
    } 
 class Image {
  private $path;
  //构造方法用来对图片所在位置进行初使化
  function __construct($path="./"){
   $this->path=rtrim($path, "/")."/";
  }
  /* 对图片进行缩放
   *
   * 参数$name: 是需要处理的图片名称
   * 参数$width:是缩放后的宽度
   * 参数$height:是缩放后的高度
   * 参数$qz: 是新图片的名称前缀
   * 返回值:就是缩放后的图片名称，失败则返回false
   *
   */
  function thumb($name, $width, $height, $qz="th_"){
   //获取图片信息
   $imgInfo=$this->getInfo($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
   $srcImg=$this->getImg($name, $imgInfo);
   //获取计算图片等比例之后的大小, $size["width"], $size["height"]
   $size=$this->getNewSize($name, $width, $height, $imgInfo);
   //获取新的图片资源, 处理一下gif透明背景
   $newImg=$this->kidOfImage($srcImg, $size, $imgInfo);
   //另存为一个新的图片，返回新的缩放后的图片名称 
   return $this->createNewImage($newImg, $qz.$name, $imgInfo); 
  }

  private function createNewImage($newImg, $newName, $imgInfo){
   switch($imgInfo["type"]){
    case 1://gif
     $result=imageGif($newImg, $this->path.$newName);
     break;
    case 2://jpg
     $result=imageJPEG($newImg, $this->path.$newName);
     break;
    case 3://png
     $return=imagepng($newImg, $this->path.$newName);
     break;
   }
   imagedestroy($newImg);
   return $newName;
  }

  private function kidOfImage($srcImg, $size, $imgInfo){
   $newImg=imagecreatetruecolor($size["width"], $size["height"]);
   
   $otsc=imagecolortransparent($srcImg);

   if($otsc >=0 && $otsc     $tran=imagecolorsforindex($srcImg, $otsc);

    $newt=imagecolorallocate($newImg, $tran["red"], $tran["green"], $tran["blue"]);

    imagefill($newImg, 0, 0, $newt);

    imagecolortransparent($newImg, $newt);
   }

   imagecopyresized($newImg, $srcImg, 0, 0, 0, 0, $size["width"], $size["height"], $imgInfo["width"], $imgInfo["height"]);

   imagedestroy($srcImg);

   return $newImg;
  }

  private function getNewSize($name, $width, $height, $imgInfo){
   $size["width"]=$imgInfo["width"];
   $size["height"]=$imgInfo["height"];

   //缩放的宽度如果比原图小才重新设置宽度
   if($width     $size["width"]=$width;
   }
   //缩放的高度如果比原图小才重新设置高度
   if($height     $size["height"]=$height;
   }

   //图片等比例缩放的算法
   if($imgInfo["width"]*$size["width"] > $imgInfo["height"] * $size["height"]){
    $size["height"]=round($imgInfo["height"]*$size["width"]/$imgInfo["width"]);
   }else{
    $size["width"]=round($imgInfo["width"]*$size["height"]/$imgInfo["height"]);
   }

   return $size;

  }

  private function getInfo($name){
   $data=getImageSize($this->path.$name);

   $imageInfo["width"]=$data[0];
   $imageInfo["height"]=$data[1];
   $imageInfo["type"]=$data[2];

   return $imageInfo;
  }

  private function getImg($name, $imgInfo){
   $srcPic=$this->path.$name;

   switch($imgInfo["type"]){
    case 1: //gif
     $img=imagecreatefromgif($srcPic);
     break;
    case 2: //jpg
     $img=imageCreatefromjpeg($srcPic);
     break;
    case 3: //png
     $img=imageCreatefrompng($srcPic);
     break;
    default:
     return false;
    
   }

   return $img;
  }
  /* 功能：为图片加水印图片
   * 参数$groundName: 背景图片，即需要加水印的图片
   * 参数$waterName: 水钱图片
   * 参数#aterPost：水印位置， 10种状态，
   *  0为随机位置
   *
   *  1. 为顶端居左  2. 为顶端居中  3 为顶端居右
   *  4  为中部居左  5. 为中部居中  6 为中部居右
   *  7 . 为底端居左 8. 为底端居中， 9. 为底端居右
   *
   * 参数$qz : 是加水印后的图片名称前缀
   * 返回值：就是处理后图片的名称
   *
   */
  function waterMark($groundName, $waterName, $waterPos=0, $qz="wa_"){
  
   if(file_exists($this->path.$groundName) && file_exists($this->path.$waterName)){
    $groundInfo=$this->getInfo($groundName);
    $waterInfo=$this->getInfo($waterName);
    //水印的位置
    if(!$pos=$this->position($groundInfo, $waterInfo, $waterPos)){
     echo "水印不应该比背景图片小！";
     return;
    }

    $groundImg=$this->getImg($groundName, $groundInfo);
    $waterImg=$this->getImg($waterName, $waterInfo);

    $groundImg=$this->copyImage($groundImg, $waterImg, $pos, $waterInfo);

    return $this->createNewImage($groundImg, $qz.$groundName, $groundInfo);
   }else{
    echo "图片或水印图片不存在";
    return false;
   }
  }

  private function copyImage($groundImg, $waterImg, $pos, $waterInfo){
   imagecopy($groundImg, $waterImg, $pos["posX"], $pos["posY"], 0, 0, $waterInfo["width"], $waterInfo["height"]);
   imagedestroy($waterImg);

   return $groundImg;
  }
  
  private function position($groundInfo, $waterInfo, $waterPos){
   //需要背景比水印图片大
   if(($groundInfo["width"]     return false;
   }

   switch($waterPos){
    case 1:
     $posX=0;
     $posY=0;
     break;
    case 2:
     $posX=($groundInfo["width"]-$waterInfo["width"])/2;
     $posY=0;
     break;
    case 3:
     $posX=$groundInfo["width"]-$waterInfo["width"];
     $posY=0;
     break;
    case 4:
     $posX=0;
     $posY=($groundInfo["height"]-$waterInfo["height"]) /2;
     break;
    case 5:
     $posX=($groundInfo["width"]-$waterInfo["width"])/2;
     $posY=($groundInfo["height"]-$waterInfo["height"]) /2;
     break;
    case 6:
     $posX=$groundInfo["width"]-$waterInfo["width"];
     $posY=($groundInfo["height"]-$waterInfo["height"]) /2;
     break;
    case 7:
     $posX=0;
     $posY=$groundInfo["height"]-$waterInfo["height"];
     break;
    case 8:
     $posX=($groundInfo["width"]-$waterInfo["width"])/2;
     $posY=$groundInfo["height"]-$waterInfo["height"];
     break;
    case 9:
     $posX=$groundInfo["width"]-$waterInfo["width"];
     $posY=$groundInfo["height"]-$waterInfo["height"];
     break;
    case 0:
    default:
     $posX=rand(0, ($groundInfo["width"]-$waterInfo["width"]));
     $posY=rand(0, ($groundInfo["height"]-$waterInfo["height"]));
     break;
   }

   return array("posX"=>$posX, "posY"=>$posY);
  }

 }

 摘自 chaojie2009的专栏

http://www.bkjia.com/PHPjc/478376.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/478376.htmlTechArticle?php class Image { private $path; //构造方法用来对图片所在位置进行初使化 function __construct($path=./){ $this-path=rtrim($path, /)./; } /* 对图片进行缩放...