php实用图片水印效果代码

php实用图片水印效果代码

define('Water',1);//水印方式(0,文字水印,1图片水印)

define('WaterImg','./water.jpg');//水印图片地址

define('WaterNum',0);//水印位置,0为随机,1-9分别为顶左顶中顶右中左中中中右底左底中底右

define('WaterX',81);//水印长

define('WaterY',81);//水印高

define('WaterType','image/jpeg');//水印图片类型

define('WaterText','爱搜罗');//水印文字(必须先转换成UTF-8才能实现中文水印)

define('WaterTextColor','#000000');//水印文字颜色

define('WaterTextSize',50);//水印文字大小 px

define('WaterTextFont','C:WINDOWSFontsSIMFANG.TTF');//水印文字字体 (仿宋)

define('WaterPtc',50);//水印透明度

//////////////////////水印默认设置完毕

class water

{

    private $img;//图片地址   

    private $img_type;//图片类型   

    //private $img_mime;//图片实际类型

    private $img_x;//图片长   

    private $img_y;//图片高

    private $is_water;//是否可以添加水印,布尔

    private $water_img;//水印图片

    private $water_text;//图片文字(UTF-8)   

    private $water_num;//水印位置(可能用不着)

    private $water_w = WaterX;//water的宽

    private $water_h = WaterY ;//water的长

    private $water_x;//水印的x位置

    private $water_y;//水印的y位置

    private $src_x;//画布与water两图的长度差

    private $src_y;//画布与water两图的高度差

    private $err_msg;//图片地址

    public function __construct($img,$img_type)

    {

        if (file_exists($img) == FALSE)

        {

            $this->Err_Img('No_Img');

        }

        $this->img = $img;

        $this->img_type = $img_type;//写入图片类型

        $this->Check_GD();//检查GD库

        $this->Do_Water();//判断水印方式

        $this->Type_Img();//判断图片类型

    }

    /*

     * 检查GD库

     */

    public function Check_GD(){

        if (function_exists("gd_info") == FALSE)

        {

            $this->Err_Img('No_Gd');

        }

    }

    /*

     * 处理水印方式及water文件类型

     */

    public function Do_Water()

    {

        if (Water == 1)//图片水印

        {

            $this->Img_Water();//处理water图片

        }else{//文字水印

            $this->Text_xy();//处理文字水印图片

        }

    }

    /*

     * 处理water图片

     */

    public function Img_Water()

    {

        if (file_exists(WaterImg) == FALSE)

        {

            $this->Err_Img('No_WaterImg');

            //使用文字水印

        }

        switch (WaterType)

        {

            case 'image/jpeg':

                $this->water_img = imagecreatefromjpeg(WaterImg);

                break;

        }

    }

    /*

     * 获得文字的长宽 并 计算 两图的长宽差

     */

    public function Text_xy()

    {

        $str   = iconv('GB2312','UTF-8',WaterText);

        $temp = imagettfbbox(50,0,WaterTextFont,$str);//取得使用 TrueType 字体的文本的范围

        $w = $temp[2] - $temp[6];

        $h = $temp[3] - $temp[7];

        $this->src_x = $this->img_x - $w;

        $this->src_y = $this->img_y - $h;

    }

    /*

     * 判断图片是否能够添加水印,比较大小

     */

    public function Is_Water()

    {

        if (Water == 1)//图片水印

        {

            $this->src_x = $this->img_x - WaterX;

            $this->src_y = $this->img_y - WaterY;

            if ($this->src_x <= 0 && $this->src_y <= 0)

            {

                $this->Err_Img('Too_Small');

            }

        }else{//文字水印

            if ($this->src_x <= 0 && $this->src_y <=0)

            {

                $this->Err_Img('Too_Small');

            }

        }

    }

    /*

     * 处理水印位置

     *   得到 水印位置的坐标

     */

    public function Water_Num()

    {

        switch(WaterNum)

        {

            case 0://随机

                $this->water_x = rand(0,($this->img_x - $this->water_w));

                $this->water_y = rand(0,($this->img_y - $this->water_h));

                break;

            case 1://顶端居左

                $this->water_x = 0;

                $this->water_y = 0;

                break;

            case 2://顶端居中

                $this->water_x = ($this->img_x - $this->water_w)/2;

                $this->water_y = 0;

                break;

            case 3://顶端居右

                $this->water_x = $this->img_x - $this->water_w;

                $this->water_y = 0;

                break;

            case 4://中间居左

                $this->water_x = 0;

                $this->water_y = ($this->img_y - $this->water_h)/2;

                break;

            case 5://中间居中

                $this->water_x = ($this->img_x - $this->water_w)/2;

                $this->water_y = ($this->img_y - $this->water_h)/2;

                break;

            case 6://中间居右

                $this->water_x = $this->img_x - $this->water_w;

                $this->water_y = ($this->img_y - $this->water_h)/2;

                break;

            case 7://底部居左

                $this->water_x = 0;

                $this->water_y = $this->img_y - $this->water_h;

                break;

            case 8://底部居中

                $this->water_x = ($this->img_x - $this->water_w)/2;

                $this->water_y = $this->img_y - $this->water_h;

                break;

            case 9://底部居右

                $this->water_x = $this->img_x - $this->water_w;

                $this->water_y = $this->img_y - $this->water_h;

                break;

            default://随机

                $this->water_x = rand(0,($this->img_x - $this->water_w));

                $this->water_y = rand(0,($this->img_y - $this->water_h));

        }

    }

    /*

     * 判断图片类型

     */

    public function Type_Img()

    {

        switch ($this->img_type)

            {

                case 'image/jpeg':

                    header("Content-type: image/jpeg");

                    $this->img = imagecreatefromjpeg($this->img);

                    break;

            }

            $this->Img_Water();//处理water图片

            $this->img_x = imagesx($this->img);

            $this->img_y = imagesy($this->img);

            $this->Water_Num();//判断水印位置

            $this->Is_Water();

            $this->Make_img();

    }

    /*

     * 制作图片水印

     */

    public function Make_img(){

                imagecopymerge($this->img,$this->water_img,$this->water_x,$this->water_y,0,0,WaterX,WaterY,WaterPtc);

                imagejpeg($this->img);

    }

    /*

     * 制作文字水印

     */

    public function Make_Text()

    {

                echo '测试';

    }

    /*

     * 返回错误信息

     */

    public function Err_Img($msg)

    {

        switch($msg)

        {

            case 'No_Gd':

                $this->err_msg = '没有安装GD库';

                break;

            case 'No_Img':

                $this->err_msg = '图片不存在';

                break;

            case 'No_WaterImg':

                $this->err_msg = 'water图片不存在';

                break;

            case 'Too_Small':

                $this->err_msg = '图片过小';

                break;

        }

        die($this->err_msg);//输出错误信息

    }

    public function __destruct()

    {

        imagedestroy($this->img);

        imagedestroy($this->img_water);

    }

}

$img = new water('./100.jpg','image/jpeg');//实例化

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