<?
/**
* 图象水印库类，目前支持jpg,gif,png,wbmp四种图象格式，支持图象和文字水印两种模式
* 能左右设定水印的位置等
* @author:feifengxlq <许立强feifengxlq#gmail.com>
* @since:2006-10-21
* @version:0.1
* @copyright:http://www.phpobject.net
*-------------------------使用实例----------------------------------------------
* 图象水印：
* demo 1:主要用于测试，输出水印图片
* require_once('../libs/classes/Watermark.class.php');
* $watermark=new watermark('../src/images/photo.jpg');
* $watermark->set('is_output',true);
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* $watermark->markpic('../src/images/source.gif');
* demo 2:水印目标图片
* require_once('../libs/classes/Watermark.class.php');
* $watermark=new watermark('../src/images/photo.jpg');
* $watermark->markpic('../src/images/source.gif');//直接在原图象上水印
*/
class Watermark{
var $gdinfo;//当前GD库的信息
var $picpath;//需要水印的图片的路径
var $picinfo;//水印图片的信息
var $min_width=100;//需要加水印图片的最小宽度
var $min_height=30;//最小高度
var $mark_border=10;//水印边距
var $mark_pct=60;//水印透明度
var $errormsg='';//出错信息
var $mark_style=5;//水印位置 0：随即 1：左上 2：右上 3：中间 4：左下 5：右下
var $is_output=false;//是否输出图象
var $image_output_method='imagejpeg';//输出图象的函数
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function __construct($picpath){
//检查是否支持GD库
$this->check_gd();
$this->picinfo=$this->get_pic_info($picpath);
$this->picpath=$picpath;
$this->is_necessary();//检查是否需要加水印
}
/**
*使用图片来显示水印
*@param:$picinfo
*@return :
*/
function markpic($picpath,$newpicpath='',$style=0){
if(empty($style))$style=$this->mark_style;
$picim=$this->image_create($this->picinfo);
//获取水印图片的信息
$waterpic=$this->get_pic_info($picpath);
//检查是否适合水印
if(($waterpic['width']+2*$this->mark_border>$this->picinfo['width'])||($waterpic['height']+2*$this->mark_border>$this->picinfo['height'])){
$this->error(4);
}
$waterim=$this->image_create($waterpic);
php程序员站 //水印合并图片
$picim=$this->imagemerge($picim,$waterim,$waterpic['width'],$waterpic['height'],$style);
//输出图象
$this->output($picim,$newpicpath);
}
/**
*使用文字来显示水印(只显示英文)
*@param:$string
*@return :
*/
function markstring_en($string,$newpicpath='',$style=0)
{
//todo
}
/**
*设置对象的属性
*@param:$key $value
*@return
*/
function set($key,$value){
if(array_key_exists($key,get_object_vars($this))){
$this->$key=$value;
}
return false;
}
/**
*获取出错信息
*@param void
*@return
*/
function get_error(){
return $this->errormsg;
}
/*----------------------以下为私有方法-------------------------------------------------*/
php程序员站 /**
*输出图象
*@param:....
*@return
*/
function output($picim,$newpicpath='')
{
$method_name=$this->image_output_method;
if($this->is_output){
header('Content-type: '.$this->picinfo['mime']);
$method_name($picim);
}else{
if(empty($newpicpath)){
$newpicpath=$this->picinfo['path'];
@unlink($this->picinfo['path']);
}
//写入新的文件
if(!@$method_name($picim,$newpicpath))$this->error(5);
return true;
}
}
/**
*合并水印图象
*@param:....
*@return
*/
function imagemerge($picim,$waterim,$water_width,$water_height,$style=5)
{
switch($style)
{
case 0:
//随即
$position[0]=rand($this->mark_border,$this->picinfo['width']-$this->mark_border-$water_width);//x
php程序员站
$position[1]=rand($this->mark_border,$this->picinfo['height']-$this->mark_border-$water_height);//y
break;
case 1:
//左上
$position[0]=$this->mark_border;
$position[1]=$this->mark_border;
break;
case 2:
//右上
$position[0]=$this->picinfo['width']-$this->mark_border-$water_width;
$position[1]=$this->mark_border;
break;
case 3:
//居中
$position[0]=round(($this->picinfo['width']-$water_width)/2);
$position[1]=round(($this->picinfo['height']-$water_height)/2);
break;
case 4:
//左下
$position[0]=$this->mark_border;
$position[1]=$this->picinfo['height']-$this->mark_border-$water_height;
break;
default:
//右下
$position[0]=$this->picinfo['width']-$this->mark_border-$water_width;
php程序员之家 $position[1]=$this->picinfo['height']-$this->mark_border-$water_height;
break;
}
imagecopymerge($picim,$waterim,$position[0],$position[1],0,0,$water_width,$water_height,$this->mark_pct);
return $picim;
}
/**
*检查系统环境是否支持GD库
*return:
*/
function check_gd(){
if(!extension_loaded('gd'))$this->error(0);
$this->gdinfo=gd_info();
}
/**
*新建一个基于调色板的图像
*@param:$picinfo
*@return :$im 图象标识符
*/
function image_create($picinfo='')
{
if(empty($picinfo))$picinfo=$this->picinfo;
//echo $picinfo['mime'];
switch(trim($picinfo['mime']))
{
case 'image/gif':
$this->image_output_method='imagegif';//获取输出图象的方法名称
php程序员之家 return imagecreatefromgif($picinfo['path']);
break;
case 'image/jpeg':
$this->image_output_method='imagejpeg';
return imagecreatefromjpeg($picinfo['path']);
break;
case 'image/png':
$this->image_output_method='imagepng';
return imagecreatefrompng($picinfo['path']);
break;
case 'image/wbmp':
$this->image_output_method='imagewbmp';
return imagecreatefromwbmp($picinfo['path']);
break;
default:
$this->error(3);
break;
}
}
/**
*获取图片的信息，主要是高度，宽度、类型
*@param:$path:文件路径
*@return :$picinfo array
*/
function get_pic_info($path)
{
if(!file_exists($path))$this->error(1,$path);
$info=getimagesize($path);
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if(empty($info))$this->error(1,$path);
$picinfo['width']=$info[0];
$picinfo['height']=$info[1];
$picinfo['mime']=$info['mime'];
$picinfo['path']=$path;
return $picinfo;
}
/**
*检查图片是否需要加水印
*@param $picinfo图片信息
*@return boolean
*/
function is_necessary($picinfo=''){
if(empty($picinfo))$picinfo=$this->picinfo;
if(!is_array($picinfo))$this->error(2);
if(($picinfo['width']<$this->min_width)||($picinfo['height']<$this->min_height)){
$this->error(4);
}
return true;
}
/**
*出错处理
*/
function error($id,$other=''){
switch($id){
case '0':
$errormsg='你的服务器不支持GD库！';
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case '1':
$errormsg='不是有效的图片！';
break;
case '2':
$errormsg='出错：函数is_necessary()中的参数必须是数组！';
break;
case '3':
$errormsg='出错：目前水印只支持gif,jpg,png,wbmp四种格式的图片！';
break;
case '4':
$errormsg='图片太小，不适合水印！';
break;
default:
$errormsg='出错了，原因未知！';
break;
}
die($errormsg.$other);
}
}
?>
