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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