<?php
/***********************************************************
类名：ImageWatermark
功能：用于生成图片或文字水印
************************************************************
合成水印：
1、图像水印appendImageMark(暂不可旋转)
2、文字水印appendTextMark(汉字水印需要设置汉字字体)（可旋转）
输出水印图像：write($filename=null)
1、输出到文件：指定$filename参数为输出的文件名。
2、输出到浏览器：不指定输出文件名，则输出到浏览器.
指定水印位置：
1、指定位置类型$markPosType:(default-0)
1-top left 2-top center 3-top right
4-middle left 5-middle center 6-middle right
7-bottom left 8-bottom center 9-bottom right
0-random
2、设置具体位置setMarkPos($x,$y)，若指定具体位置，则上面的位置类型无效。
************************************************************
*/
class ImageWatermark{
public $markPosType = 0; //水印位置，缺省为随机位置输出水印
public $fontFile = '../FZJLJT.FON'; //字体文件名
public $color = '#CCCCCC'; //水印字体的颜色
public $fontSize = 12; //水印字体大小
public $angle = 0; //水印文字旋转的角度
private $markPos = array();
private $markImageFile = null, $destImageFile = null;
private $mark_res = null, $mark_width = 0, $mark_height = 0, $mark_type = null;
private $dest_res = null, $dest_width = 0, $dest_height = 0, $dest_type = null;
//用目标图片作为构造函数的参数
public function __construct($destImage){
if(!file_exists($destImage)) return false;
$this->destImageFile=$destImage;
//获取图片大小、类型
$imageInfo = getimagesize($this->destImageFile);
$this->dest_width = $imageInfo[0];$this->dest_height = $imageInfo[1];$this->dest_type = $imageInfo[2];
//得到图片资源句柄
$this->dest_res = $this->getImageResource($this->destImageFile,$this->dest_type);
}
public function __destruct(){
imagedestroy($this->dest_res);
}
//添加文字水印
public function appendTextMark($markText){
if($markText==null) return false;
//计算水印文本的大小
$box = imagettfbbox($this->fontSize,$this->angle,$this->fontFile,$markText);
$this->mark_width = $box[2]-$box[6];
$this->mark_height = $box[3]-$box[7];
//计算水印位置
$pos = ($this->markPos!=null)?$this->markPos:$this->getMarkPosition($this->markPosType);
$pos[1]+=$this->mark_height;
//将文字打印到图片上
$RGB=$this->colorHexRgb($this->color);
$imageColor=imagecolorallocate($this->dest_res,$RGB[0],$RGB[1],$RGB[2]);
imagettftext($this->dest_res,$this->fontSize,$this->angle,$pos[0],$pos[1],$imageColor,$this->fontFile,$markText);
}
//添加图片水印
public function appendImageMark($markImage){
if(!file_exists($markImage)) return false;
$this->markImageFile=$markImage;
//获取水印图片大小、类型
$imageInfo = getimagesize($this->markImageFile);
$this->mark_width = $imageInfo[0];$this->mark_height = $imageInfo[1];$this->mark_type = $imageInfo[2];
//得到图片资源句柄
$this->mark_res = $this->getImageResource($this->markImageFile,$this->mark_type);
//计算水印位置
$pos = ($this->markPos!=null)?$this->markPos:$this->getMarkPosition($this->markPosType);
//设置图像混色模式
imagealphablending($this->dest_res, true);
//复制叠加图像
imagecopy($this->dest_res,$this->mark_res,$pos[0],$pos[1],0,0,$this->mark_width,$this->mark_height);
imagedestroy($this->mark_res);
}
//将叠加水印后的图片写入指定文件，若不定文件名，则输出到浏览器
public function write($filename=null){
$this->writeImage($this->dest_res,$filename,$this->dest_type);
}
//设置水印x,y坐标
public function setMarkPos($x,$y){
$this->markPos[0]=$x; $this->markPos[1]=$y;
}
//将十六进制的颜色值分解成RGB形式
private function colorHexRgb($color){
$color = preg_replace('/#/','',$color);
$R=hexdec($color[0].$color[1]);
$G=hexdec($color[2].$color[3]);
$B=hexdec($color[4].$color[5]);
return array($R,$G,$B);
}
//计算水印位置
private function getMarkPosition($type=0){
switch($type){
case 0: $x = rand(0,$this->dest_width-$this->mark_width);
$y = rand(0,$this->dest_height-$this->mark_height);
break;//random
case 1: $x = 0;
$y = 0;
break;//topleft
case 2: $x = ($this->dest_width-$this->mark_width)/2;
$y = 0;
break; //topcenter
case 3: $x = $this->dest_width-$this->mark_width;
$y = 0;
break;// topright
case 4: $x = 0;
$y = ($this->dest_height-$this->mark_height)/2;
break;//middleleft
case 5: $x = ($this->dest_width-$this->mark_width)/2;
$y = ($this->dest_height-$this->mark_height)/2;
break;//middlecenter
case 6: $x = $this->dest_width-$this->mark_width;
$y = ($this->dest_height-$this->mark_height)/2;
break;//middleright
case 7: $x = 0; $y = $this->dest_height-$this->mark_height;
break;//bottomleft
case 8: $x = ($this->dest_width-$this->mark_width)/2;
$y = $this->dest_height-$this->mark_height;
break;//bottomcenter
case 9: $x = $this->dest_width-$this->mark_width;
$y = $this->dest_height-$this->mark_height;
break;//bottomright
default:$x = rand(0,$this->dest_width-$this->mark_width);
$y = rand(0,$this->dest_height-$this->mark_height);
break;//random
}
return array($x,$y);
}
//从一个图像文件中取得图片资源标识符
private function getImageResource($filename,$type=0){
switch($type){
case 1:return imagecreatefromgif($filename);break;
case 2:return imagecreatefromjpeg($filename);break;
case 3:return imagecreatefrompng($filename);break;
// 以后可添加其它格式
default:return null;
}
}
//将图像写入文件或输出到浏览器
private function writeImage($ImageRes,$filename=null,$type=0){
switch($type) {
case 1:imagegif($ImageRes,$filename);break;
case 2:imagejpeg($ImageRes,$filename);break;
case 3:imagepng($ImageRes,$filename);break;
default:return null;
}
return true;
}
}
?>
//使用示例
$markimg = new ImageWatermark('1.jpg');
//$markimg->setMarkPos(100,200);//如何设置setMarkPos,则markPosType无效。
$markimg->markPosType=5;
$markimg->appendImageMark('mark.png');
$markimg->fontFile='../FZJLJT.FON';
$markimg->color='#FFFFFF';
$markimg->fontSize=24;
$markimg->angle=45;//设置角度时，注意水印可能旋转出目标图片之外。
$markimg->appendTextMark('汉字水印');
$markimg->write();
$markimg=null;
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