PHP的生成图片或文字水印的类_php 水印、

<?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 = 'arial.ttf';   //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('c_si.jpg');
 
//$markimg->setMarkPos(100,200);//如何设置setMarkPos,则markPosType无效。
 
$markimg->markPosType=5;
 
$markimg->appendImageMark('mark.png');
 
$markimg->fontFile='STCAIYUN.TTF';
 
$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;
 
 
 
?>