functionimageWaterMark($groundImage,$waterPos=0,$waterImage="",$waterText="",$textFont=5,$textColor="#FF0000")
{
$isWaterImage=FALSE;
$formatMsg="暂不支持该文件格式，请用图片处理软件将图片转换为GIF、JPG、PNG格式。";
//读取水印文件
if(!empty($waterImage)&&file_exists($waterImage))
{
$isWaterImage=TRUE;
$water_info=getimagesize($waterImage);
$water_w=$water_info[0];//取得水印图片的宽
$water_h=$water_info[1];//取得水印图片的高
switch($water_info[2])//取得水印图片的格式
{
case1:$water_im=imagecreatefromgif($waterImage);break;
case2:$water_im=imagecreatefromjpeg($waterImage);break;
case3:$water_im=imagecreatefrompng($waterImage);break;
default:die($formatMsg);
}
}
//读取背景图片
if(!empty($groundImage)&&file_exists($groundImage))
{
$ground_info=getimagesize($groundImage);
$ground_w=$ground_info[0];//取得背景图片的宽
$ground_h=$ground_info[1];//取得背景图片的高
switch($ground_info[2])//取得背景图片的格式
{
//case1:$ground_im=imagecreatefromgif($groundImage);break;
case1:return;
case2:$ground_im=imagecreatefromjpeg($groundImage);break;
case3:$ground_im=imagecreatefrompng($groundImage);break;
default:die($formatMsg);
}
}
else
{
//die("需要加水印的图片不存在！");
return;
}
//水印位置
if($isWaterImage)//图片水印
{
$w=$water_w;
$h=$water_h;
$label="图片的";
}
else//文字水印
{
$temp=imagettfbbox(ceil($textFont5.5),0,"./cour.ttf",$waterText);//取得使用TrueType字体的文本的范围$w=$temp[2]-$temp[6];$h=$temp[3]-$temp[7];unset($temp);$label="文字区域";}if(($ground_w<2$w)||($ground_h<1.5*$h))
{
echo"需要加水印的图片的长度或宽度比水印".$label."还小，无法生成水印！";
return;
}
switch($waterPos)
{
case0://随机
$posX=rand(0,($ground_w-$w));
$posY=rand(0,($ground_h-$h));
break;
case1://1为顶端居左
$posX=0;
$posY=0;
break;
case2://2为顶端居中
$posX=($ground_w-$w)/2;
$posY=0;
break;
case3://3为顶端居右
$posX=$ground_w-$w;
$posY=0;
break;
case4://4为中部居左
$posX=0;
$posY=($ground_h-$h)/2;
break;
case5://5为中部居中
$posX=($ground_w-$w)/2;
$posY=($ground_h-$h)/2;
break;
case6://6为中部居右
$posX=$ground_w-$w;
$posY=($ground_h-$h)/2;
break;
case7://7为底端居左
$posX=0;
$posY=$ground_h-$h;
break;
case8://8为底端居中
$posX=($ground_w-$w)/2;
$posY=$ground_h-$h;
break;
case9://9为底端居右
$posX=$ground_w-$w;
$posY=$ground_h-$h;
break;
default://随机
$posX=rand(0,($ground_w-$w));
$posY=rand(0,($ground_h-$h));
break;
}
//设定图像的混色模式
imagealphablending($ground_im,true);
if($isWaterImage)//图片水印
{
imagecopy($ground_im,$water_im,$posX,$posY,0,0,$water_w,$water_h);//拷贝水印到目标文件
}
else//文字水印
{
if(!empty($textColor)&&(strlen($textColor)==7))
{
$R=hexdec(substr($textColor,1,2));
$G=hexdec(substr($textColor,3,2));
$B=hexdec(substr($textColor,5));
}
else
{
die("水印文字颜色格式不正确！");
}
imagestring($ground_im,$textFont,$posX,$posY,$waterText,imagecolorallocate($ground_im,$R,$G,$B));
}
//生成水印后的图片
@unlink($groundImage);
switch($ground_info)//取得背景图片的格式
{
//case1:imagegif($ground_im,$groundImage);break;
case1:return;
case2:imagejpeg($ground_im,$groundImage);break;
case3:imagepng($ground_im,$groundImage);break;
default:die($errorMsg);
}
//释放内存
if(isset($water_info))unset($water_info);
if(isset($water_im))imagedestroy($water_im);
unset($ground_info);
imagedestroy($ground_im);
}
