php實用圖片浮水印效果代碼

php實用圖片浮水印效果代碼
<?php

define('Water',1);//浮水印方式(0,文字浮水印,1圖片浮水印)

define('WaterImg','./water.jpg');//浮水印圖片地址

define('WaterNum',0);//浮水印位置,0為隨機,1-9分別為頂左頂中頂右中左中中中右底左底中底右

define('WaterX',81);//浮水印長

define('WaterY',81);//浮水印高

define('WaterType','image/jpeg');//浮水印圖片類型

define('WaterText','愛搜羅');//浮水印文字(必須先轉換成UTF-8才能實現中文浮水印)

define('WaterTextColor','#000000');//浮水印文字顏色

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

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

define('WaterPtc',50);//浮水印透明度

//////////////////////浮水印預設設定完畢

 

class water

{

    private $img;//圖片地址   

    private $img_type;//圖片類型   

    //private $img_mime;//圖片實際類型

    private $img_x;//圖片長   

    private $img_y;//圖片高

    private $is_water;//是否可以添加浮水印,布爾

    private $water_img;//浮水印圖片

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

    private $water_num;//浮水印位置(可能用不著)

    private $water_w = WaterX;//water的寬

    private $water_h = WaterY ;//water的長

    private $water_x;//浮水印的x位置

    private $water_y;//浮水印的y位置

    private $src_x;//畫布與water兩圖的長度差

    private $src_y;//畫布與water兩圖的高度差

    private $err_msg;//圖片地址

 

    public function __construct($img,$img_type)

    {

        if (file_exists($img) == FALSE)

        {

            $this->Err_Img('No_Img');

        }

        $this->img = $img;

        $this->img_type = $img_type;//寫入圖片類型

        $this->Check_GD();//檢查GD庫

        $this->Do_Water();//判斷浮水印方式

       

        $this->Type_Img();//判斷圖片類型

    }

    /*

     * 檢查GD庫

     */

    public function Check_GD(){

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

        {

            $this->Err_Img('No_Gd');

        }

    }

    /*

     * 處理浮水印方式及water檔案類型

     */

    public function Do_Water()

    {

        if (Water == 1)//圖片浮水印

        {

            $this->Img_Water();//處理water圖片

        }else{//文字浮水印

            $this->Text_xy();//處理文字浮水印圖片

        }

    }

    /*

     * 處理water圖片

     */

    public function Img_Water()

    {

        if (file_exists(WaterImg) == FALSE)

        {

            $this->Err_Img('No_WaterImg');

            //使用文字浮水印

        }

        switch (WaterType)

        {

            case 'image/jpeg':

                $this->water_img = imagecreatefromjpeg(WaterImg);

                break;

        }

    }

    /*

     * 獲得文字的長寬 並 計算 兩圖的長寬差

     */

    public function Text_xy()

    {

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

        $temp = imagettfbbox(50,0,WaterTextFont,$str);//取得使用 TrueType 字型的文本的範圍

        $w = $temp[2] - $temp[6];

        $h = $temp[3] - $temp[7];

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

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

    }

    /*

     * 判斷圖片是否能夠添加浮水印,比較大小

     */

    public function Is_Water()

    {

        if (Water == 1)//圖片浮水印

        {

            $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{//文字浮水印

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

            {

                $this->Err_Img('Too_Small');

            }

        }

    }

    /*

     * 處理浮水印位置

     *   得到 浮水印位置的座標

     */

    public function Water_Num()

    {

        switch(WaterNum)

        {

            case 0://隨機

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

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

                break;

            case 1://頂端居左

                $this->water_x = 0;

                $this->water_y = 0;

                break;

            case 2://頂端置中

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

                $this->water_y = 0;

                break;

            case 3://頂端居右

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

                $this->water_y = 0;

                break;

            case 4://中間居左

                $this->water_x = 0;

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

                break;

            case 5://中間置中

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

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

                break;

            case 6://中間居右

                $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://底部置中

                $this->water_x = ($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://隨機

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

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

        }

    }

    /*

     * 判斷圖片類型

     */

    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();//處理water圖片

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

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

            $this->Water_Num();//判斷浮水印位置

            $this->Is_Water();

            $this->Make_img();

    }

    /*

     * 製作圖片浮水印

     */

    public function Make_img(){

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

                imagejpeg($this->img);

    }

    /*

     * 製作文字浮水印

     */

    public function Make_Text()

    {

                echo '測試';

    }

    /*

     * 返回錯誤資訊

     */

    public function Err_Img($msg)

    {

        switch($msg)

        {

            case 'No_Gd':

                $this->err_msg = '沒有安裝GD庫';

                break;

            case 'No_Img':

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

                break;

            case 'No_WaterImg':

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

                break;

            case 'Too_Small':

                $this->err_msg = '圖片過小';

                break;

        }

        die($this->err_msg);//輸出錯誤資訊

    }

    public function __destruct()

    {

        imagedestroy($this->img);

        imagedestroy($this->img_water);

    }

}

 

$img = new water('./100.jpg','image/jpeg');//執行個體化

 

?>