php生成水印，包括位置和透明度

 

/*

给大家推荐一下！主要包括图片的裁剪，缩放，加水印等。下面是一些简单的使用方法。

include("imageclass.php");   //这里注意imageclass.php的路径

$imgs=new image();

$imgs->param($tempFile);

if(!$imgs->thumb($targetFile,600,500))die('--图像上传失败！');  //对图片进行缩放

 

$imgs->water($targetFile,$water,$pos=0,$pct=50);主要包括两个参数，$targetFile为已经上传到服务器的文件路径，$water为水印图片,$pos为水印图片位置，$pct为透明度；

$pos位置说明：

0://随机

1://1为顶端居左

2://2为顶端居中

3://3为顶端居右

4://4为中部居左

5://5为中部居中

6://6为中部居右

7://7为底端居左

8://8为底端居中

9://9为底端居右

 

 

将//里边的内容保存在imageclass.php里边，就可以调用了。

///////////////////////////////////////////////////////////////

*/

?>

/* +-------------------------------------------------------------+

* | Copyright (c) 2008-2009 Diqiye.Com All rights reserved.

* +-------------------------------------------------------------+

* | Info : 图像处理类

* +-------------------------------------------------------------+

*/

class image {

        // 当前图片

        protected $img;

        // 图像types 对应表

        protected $types = array(

                        1 => 'gif',

                        2 => 'jpg',

                        3 => 'png',

                        6 => 'bmp'

                    );

 

        // image

        public function __construct($img=''){

                !$img && $this->param($img);

        }

 

        // Info

        public function param($img){

                $this->img = $img;

                return $this;

        }

 

        // imageInfo

        public function getImageInfo($img){

                $info = @getimagesize($img);

                if(isset($this->types[$info[2]])){

                        $info['ext'] = $info['type'] = $this->types[$info[2]];

                } else{

                        $info['ext'] = $info['type'] = 'jpg';

                }

                $info['type'] == 'jpg' && $info['type'] = 'jpeg';

                $info['size'] = @filesize($img);

                return $info;

        }

 

        // thumb(新图地址, 宽, 高, 裁剪, 允许放大)

        public function thumb($filename,$new_w=160,$new_h=120,$cut=0,$big=0){

       

        // 获取原图信息

        $info  = $this->getImageInfo($this->img);

        if(!empty($info[0])) {

            $old_w  = $info[0];

            $old_h  = $info[1];

            $type   = $info['type'];

            $ext    = $info['ext'];

            unset($info);

            // 如果原图比缩略图小 并且不允许放大

            if($old_w

                    return false;

            }

            // 裁剪图片

            if($cut == 0){ // 等比列

                    $scale = min($new_w/$old_w, $new_h/$old_h); // 计算缩放比例

                    $width  = (int)($old_w*$scale); // 缩略图尺寸

                    $height = (int)($old_h*$scale);

                    $start_w = $start_h = 0;

                    $end_w = $old_w;

                    $end_h = $old_h;

            } elseif($cut == 1){ // center center 裁剪

                        $scale1 = round($new_w/$new_h,2);

                        $scale2 = round($old_w/$old_h,2);

                        if($scale1 > $scale2){

                                $end_h = round($old_w/$scale1,2);

                                $start_h = ($old_h-$end_h)/2;

                                $start_w  = 0;

                                $end_w    = $old_w;

                        } else{

                                $end_w  = round($old_h*$scale1,2);

                                $start_w  = ($old_w-$end_w)/2;

                                $start_h = 0;

                                $end_h   = $old_h;

                        }

                        $width = $new_w;

                    $height= $new_h;

                } elseif($cut == 2){ // left top 裁剪

                        $scale1 = round($new_w/$new_h,2);

                    $scale2 = round($old_w/$old_h,2);

                    if($scale1 > $scale2){

                            $end_h = round($old_w/$scale1,2);

                            $end_w = $old_w;

                    } else{

                            $end_w = round($old_h*$scale1,2);

                            $end_h = $old_h;

                    }

                    $start_w = 0;

                    $start_h = 0;

                    $width = $new_w;

                    $height= $new_h;

                }

            // 载入原图

            $createFun  = 'ImageCreateFrom'.$type;

            $oldimg     = $createFun($this->img);

            // 创建缩略图

            if($type!='gif' && function_exists('imagecreatetruecolor')){

                $newimg = imagecreatetruecolor($width, $height);

            } else{

                $newimg = imagecreate($width, $height);

            }

            // 复制图片

            if(function_exists("ImageCopyResampled")){

                    ImageCopyResampled($newimg, $oldimg, 0, 0, $start_w, $start_h, $width, $height, $end_w,$end_h);

            } else{

                ImageCopyResized($newimg, $oldimg, 0, 0, $start_w, $start_h, $width, $height, $end_w,$end_h);

            }

 

            // 对jpeg图形设置隔行扫描

            $type == 'jpeg' && imageinterlace($newimg,1);

            // 生成图片

            $imageFun = 'image'.$type;

            !@$imageFun($newimg,$filename,100) && die('保存失败!检查目录是否存在并且可写?');

            ImageDestroy($newimg);

            ImageDestroy($oldimg);

            return $filename;

        }

        return false;

    }

 

    // water(保存地址,水印图片,水印位置,透明度)

        public function water($filename,$water,$pos=0,$pct=50){

                // 加载水印图片

                $info = $this->getImageInfo($water);

                if(!empty($info[0])){

                        $water_w = $info[0];

                        $water_h = $info[1];

                        $type = $info['type'];

                        $fun  = 'imagecreatefrom'.$type;

                        $waterimg = $fun($water);

                } else{

                        return false;

                }

                // 加载背景图片

                $info = $this->getImageInfo($this->img);

                if(!empty($info[0])){

                        $old_w = $info[0];

                        $old_h = $info[1];

                        $type  = $info['type'];

                        $fun   = 'imagecreatefrom'.$type;

                        $oldimg = $fun($this->img);

                } else{

                        return false;

                }

                // 剪切水印

                $water_w >$old_w && $water_w = $old_w;

                $water_h >$old_h && $water_h = $old_h;

 

                // 水印位置

                switch($pos){

                    case 0://随机

                    $posX = rand(0,($old_w - $water_w));

                    $posY = rand(0,($old_h - $water_h));

                    break;

                case 1://1为顶端居左

                    $posX = 0;

                    $posY = 0;

                    break;

                case 2://2为顶端居中

                    $posX = ($old_w - $water_w) / 2;

                    $posY = 0;

                    break;

                case 3://3为顶端居右

                    $posX = $old_w - $water_w;

                    $posY = 0;

                    break;

                case 4://4为中部居左

                    $posX = 0;

                    $posY = ($old_h - $water_h) / 2;

                    break;

                case 5://5为中部居中

                    $posX = ($old_w - $water_w) / 2;

                    $posY = ($old_h - $water_h) / 2;

                    break;

                case 6://6为中部居右

                    $posX = $old_w - $water_w;

                    $posY = ($old_h - $water_h) / 2;

                    break;

                case 7://7为底端居左

                    $posX = 0;

                    $posY = $old_h - $water_h;

                    break;

                case 8://8为底端居中

                    $posX = ($old_w - $water_w) / 2;

                    $posY = $old_h - $water_h;

                    break;

                case 9://9为底端居右

                    $posX = $old_w - $water_w;

                    $posY = $old_h - $water_h;

                    break;

                default: //随机

                    $posX = rand(0,($old_w - $water_w));

                    $posY = rand(0,($old_h - $water_h));

                    break;

                }

            // 设定图像的混色模式

                imagealphablending($oldimg, true);

                // 添加水印

                imagecopymerge($oldimg, $waterimg, $posX, $posY, 0, 0, $water_w,$water_h,$pct);

                $fun = 'image'.$type;

                !@$fun($oldimg, $filename,100) && die('保存失败!检查目录是否存在并且可写?');

                  imagedestroy($oldimg);

                  imagedestroy($waterimg);

                  return $filename;

        }

}

 

$imgs=new image();

$tempFile = "./images/hdb.jpg";

$water = "./images/bamiluo.jpg";

 

$imgs->param($tempFile);

//if(!$imgs->thumb($targetFile,600,500))die('fail');

 

$imgs->water($targetFile,$water,0,10);

echo "aaa";

?>

摘自：ws07_byyy的专栏