php image processing class_PHP tutorial-PHP Tutorial-php.cn

class Image {
        private $path;
//Construction method is used to initialize the location of the picture
function __construct($path="./"){
                 $this->path=rtrim($path, "/")."/";
         }
/* A shrinking of the picture
*
* Parameter $name: is the name of the image that needs to be processed
* Parameter $width: is the width after scaling
* Parameter $height: is the scaled height
* Parameter $qz: is the name prefix of the new picture
               * Return value: It is the name of the zoomed image, if it fails, it returns false
*
          */
         function thumb($name, $width, $height, $qz="th_"){
//Get picture information
                $imgInfo=$this->getInfo($name); //Width, height, type of image
//Get image resources, resources can be created for various types of pictures jpg, gif, png
                 $srcImg=$this->getImg($name, $imgInfo);
//Get the size of the image after calculating the equal proportions, $size["width"], $size["height"]
$size=$this->getNewSize($name, $width, $height, $imgInfo);
//Get new image resources and process the gif transparent background
                $newImg=$this->kidOfImage($srcImg, $size, $imgInfo);
//Save as a new image and return the new scaled image name
                  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 && $otsc <= imagecolorstotal($srcImg)){
                $tran=imagecolorsforindex($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 < $imgInfo["width"]){
                $size["width"]=$width;
            }
            //缩放的高度如果比原图小才重新设置高度
            if($height < $imgInfo["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"]< $waterInfo["width"]) ||($groundInfo["height"] < $waterInfo["height"])){
                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
   *
* Parameter $name: is the name of the image that needs to be processed
* Parameter $width: is the width after scaling
* Parameter $height: is the scaled height
* Parameter $qz: is the name prefix of the new picture
* Return value: It is the name of the zoomed image. If it fails, it returns false
*
*/
function thumb($name, $width, $height, $qz="th_"){
//Get picture information
$imgInfo=$this->getInfo($name); //Width, height, type of image
//Get picture resources, you can create resources for various types of pictures jpg, gif, png
$srcImg=$this->getImg($name, $imgInfo);
//Get the size of the image after calculating the equal proportions, $size["width"], $size["height"]
$size=$this->getNewSize($name, $width, $height, $imgInfo);
//Get new image resources and process the gif transparent background
$newImg=$this->kidOfImage($srcImg, $size, $imgInfo);
//Save as a new picture and return the new scaled picture name
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 && $otsc <= imagecolorstotal($srcImg)){
$tran=imagecolorsforindex($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"];

//If the zoomed width is smaller than the original image, reset the width
if($width < $imgInfo["width"]){
$size["width"]=$width;
}
//If the zoomed height is smaller than the original image, reset the height
if($height < $imgInfo["height"]){
$size["height"]=$height;
}

//Algorithm for image scaling
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;
}
/* Function: Add watermark to pictures
* Parameter $groundName: background image, that is, the image that needs to be watermarked
* Parameter $waterName: water money picture
* Parameter #aterPost: watermark position, 10 states,
* 0 is a random position
*
* 1. For top left 2. For top center 3 For top right
* 4 means the middle is on the left 5. means the middle is in the middle 6 means the middle is on the right
* 7. The bottom is on the left, 8. The bottom is in the middle, 9. The bottom is on the right
*
* Parameter $qz: is the watermarked image name prefix
* Return value: It is the name of the processed image
*
*/
function waterMark($groundName, $waterName, $waterPos=0, $qz="wa_"){

If(file_exists($this->path.$groundName) && file_exists($this->path.$waterName)){
$groundInfo=$this->getInfo($groundName);
$waterInfo=$this->getInfo($waterName);
//Position of watermark
If(!$pos=$this->position($groundInfo, $waterInfo, $waterPos)){
echo "The watermark should not be smaller than the background image!";
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 "The picture or watermark image does not exist";
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, $waterPos){
//The background needs to be larger than the watermark image
if(($groundInfo["width"]< $waterInfo["width"]) ||($groundInfo["height"] < $waterInfo["height"])){
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