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 < $new_h && $old_h < $new_w && !$big){

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