//------------------------------------------------------------------
//------------------------------------
//功能:对象运行函数,给图片加上水印
//参数:无
//返回:无
function Run()
{
if($this->FileName == "" || $this->Text == "")
return;
//检测是否安装GD库
if(false == function_exists("gd_info"))
{
echo "系统没有安装GD库,不能给图片加水印.";
return;
}
//设置输入、输出图片路径名
$arr_in_name = explode(".",$this->FileName);
//
$inImg = $this->Path.$this->FileName;
$outImg = $inImg;
$tmpImg = $this->Path.$arr_in_name[0]."_tmp.".$arr_in_name; //临时处理的图片,很重要
if(!$this->OverFlag)
$outImg = $this->Path.$arr_in_name[0]."_water_down.".$arr_in_name;
//检测图片是否存在
if(!file_exists($inImg))
return ;
//获得图片的属性
$groundImageType = @getimagesize($inImg);
$imgWidth = $groundImageType[0];
$imgHeight = $groundImageType;
$imgType = $groundImageType;
if($imgWidth < $this->BaseWidth) //小于基本宽度,不处理
return;
//图片不是jpg/jpeg/gif/png时,不处理
switch($imgType)
{
case 1:
$image = imagecreatefromgif($inImg);
$this->TextBgColor = "#ffffff"; //gif图片字体只能为黑,所以背景颜色就设置为白色
break;
case 2:
$image = imagecreatefromjpeg($inImg);
break;
case 3:
$image = imagecreatefrompng($inImg);
break;
default:
return;
break;
}
//创建颜色
$color = @imagecolorallocate($image,hexdec(substr($this->TextColor,1,2)),hexdec(substr($this->TextColor,3,2)),hexdec(substr($this->TextColor,5,2))); //文字颜色
//生成一个空的图片,它的高度在底部增加水印高度
$newHeight = $imgHeight+20;
$objTmpImg = @imagecreatetruecolor($imgWidth,$newHeight);
$colorBg = @imagecolorallocate($objTmpImg,hexdec(substr($this->TextBgColor,1,2)),hexdec(substr($this->TextBgColor,3,2)),hexdec(substr($this->TextBgColor,5,2))); //背景颜色
//填充图片的背景颜色
@imagefill ($objTmpImg,0,0,$colorBg);
//把原图copy到临时图片中
@imagecopy($objTmpImg,$image,0,0,0,0,$imgWidth,$imgHeight);
//创建要写入的水印文字对象
$objText = $this->createText($this->Text);
//计算要写入的水印文字的位置
$x = 5;
$y = $newHeight-5;
//写入文字水印
@imagettftext($objTmpImg,10,0,$x,$y,$color,$this->Font,$objText);
//生成新的图片,临时图片
switch($imgType)
{
case 1:
imagegif($objTmpImg,$tmpImg);
break;
case 2:
imagejpeg($objTmpImg,$tmpImg);
break;
case 3:
imagepng($objTmpImg,$tmpImg);
break;
default:
return;
break;
}
//释放资源
@imagedestroy($objTmpImg);
@imagedestroy($image);
//重新命名文件
if($this->OverFlag)
{
//覆盖原图
@unlink($inImg);
@rename($tmpImg,$outImg);
}
else
{
//不覆盖原图
@rename($tmpImg,$outImg);
}
}
//--------------------------------------
//功能:创建水印文字对象
//参数:无
//返回:创建的水印文字对象
function createText($instring)
{
$outstring="";
$max=strlen($instring);
for($i=0;$i<$max;$i++)
{
$h=ord($instring[$i]);
if($h>=160 && $i<$max-1)
{
$outstring .= "".base_convert(bin2hex(iconv("gb2312","ucs-2",substr($instring,$i,2))),16,10).";";
$i++;
}
else
{
$outstring .= $instring[$i];
}
}
return $outstring;
}
}//class
?>