ImageWatermark.php
<?php
/***********************************************************
类名：ImageWatermark
功能：用于生成图片或文字水印
WDPHP素材源码 http://www.wdphp.com
************************************************************
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;
?>
