参考phpcms所写的图片添加水印功能_pbootcms水印-优快云博客

本文链接：https://blog.youkuaiyun.com/yellowshit/article/details/12995755
<?php
class water{
	
	//待添加图片资源,水印资源
	public $src_im,$water_im;
	//水印位置
	public $posW,$posH;
	//待加水印图片宽高
	private $fileW,$fileH;
	//水印图片宽高和按比例生成的宽高
	private $waterW,$waterH,$waterNW,$waterNH;
	//水印尺寸
	private $size;
	
	//构造函数
	public function __construct($file,$water,$size,$pos){		
		$this->size = $this->setSize($size);
		$this->setFileInfo($file);
		$this->setWaterInfo($water);
		$this->setPos($pos);
		$this->dealImage();
	}
	
	/**
	 * 得到水印大小
	 * @param $size int 尺寸 
	 */
	private function setSize($size){
		switch($size){
			case 1:
				return 0.5;
				break;
			case 2:
				return 0.75;
				break;
			case 3:
				return 0.98;
				break;
			default:
				return 0.75;
		}
	}
	
	/**
	 * 得到图片宽高和图片资源
	 * @param $file string 待加水印图片
	 */
	private function setFileInfo($file){
		$arr = getimagesize($file);
		$this->src_im = $this->setSourse($file,$arr['mime']);
		$this->fileW = $arr[0];
		$this->fileH = $arr[1];
		return true;
	}
	
	/**
	 * 得到水印图片宽高和按比例缩小的宽高和水印图片资源
	 * @param $water string 水印图片
	 */
	private function setWaterInfo($water){
		$arr = getimagesize($water);
		$this->water_im = $this->setSourse($water,$arr['mime']);
		$this->waterW = $arr[0];
		$this->waterH = $arr[1];
		//按比例得到新水印的宽高
		$this->waterNW = $this->fileW * $this->size;
		$this->waterNH = $this->waterNW * ($this->waterH / $this->waterW);
		return true;
	}
	
	/**
	 * 生成水印
	 */
	private function dealImage(){
		imagecopyresized($this->src_im,$this->water_im,$this->posW,$this->posH,0,0,$this->waterNW,$this->waterNH,$this->waterW,$this->waterH);
	}
	
	/**
	 * 按后缀得到图片资源
	 * @param $file string 图片
	 * @param $ext string 图片后缀
	 */
	private function setSourse($file,$ext){
		switch($ext){
			case 'image/jpeg':
				return imagecreatefromjpeg($file);
				break;
			case 'image/png':
				return imagecreatefrompng($file);
				break;
			case 'image/gif': 
				return imagecreatefromgif($file);
				break;
		}
	}
	
	/**
	 * 设定水印生成位置
	 * @param $pos int 位置
	 */
	private function setPos($pos){
		switch($pos){
			case 1:
				$this->posW = ($this->fileW - $this->waterNW) / 5;
				$this->posH = ($this->fileW - $this->waterNW) / 5;
				break;
			case 2:
				$this->posW = ($this->fileW - $this->waterNW) / 2;
				$this->posH = ($this->fileW - $this->waterNW) / 5;
				break;
			case 3:
				$this->posW = $this->fileW - $this->waterNW;
				$this->posH = ($this->fileW - $this->waterNW) / 5;
				break;
			case 4:
				$this->posW = ($this->fileW - $this->waterNW) / 5;
				$this->posH = ($this->fileH - $this->waterNH) / 2;
				break;
			case 5:
				$this->posW = ($this->fileW - $this->waterNW) / 2;
				$this->posH = ($this->fileH - $this->waterNH) / 2;
				break;
			case 6:
				$this->posW = $this->fileW - $this->waterNW;
				$this->posH = ($this->fileH - $this->waterNH) / 2;
				break;
			case 7:
				$this->posW = ($this->fileW - $this->waterNW) / 5;
				$this->posH = ($this->fileH - $this->waterNH) / 1.1;
				break;
			case 8:
				$this->posW = ($this->fileW - $this->waterNW) / 2;
				$this->posH = ($this->fileH - $this->waterNH) / 1.1;
				break;
			case 9:
				$this->posW = $this->fileW - $this->waterNW;
				$this->posH = ($this->fileH - $this->waterNH) / 1.1;
				break;
		}
	}
	
	/**
	 * 返回生成水印后的图片
	 */
	public function getImage(){
		return $this->src_im;
	}
}
if(isset($_POST['submit'])){
	if(isset($_POST['file'])&&isset($_POST['water'])&&isset($_POST['size'])&&isset($_POST['pos'])){
		$file = $_POST['file'];
		$water = $_POST['water'];
		$size = $_POST['size'];
		$pos = $_POST['pos'];
		$im = new water($file,$water,$size,$pos);
		imagejpeg($im->getImage(),'newImage.jpg');
	}else{
		echo "<script>alert('数据不完整')</script>";
	}
}
?>
<html>
	<head>
		<title>水印生成器</title>
	</head>
	<body>
		<form name="myform" action="" method="POST">
		<p>待生成水印图片:</p>
		<input type="text" name="file" value="1.jpeg"/><br />
		<p>水印图片:</p>
		<input type="text" name="water" value="logo.png"/><br />
		<p>大小:</p>
		<input type="radio" name="size" value="1" />小    <input type="radio" name="size" value="2" />中    <input type="radio" name="size" value="3" />大<br />
		<p>位置:</p>
		<table border="1px">
			<tr>
				<td><input type="radio" name="pos" value="1" />左上</td>
				<td><input type="radio" name="pos" value="2" />中上</td>
				<td><input type="radio" name="pos" value="3" />右上</td>
			</tr>
			<tr>
				<td><input type="radio" name="pos" value="4" />左中</td>
				<td><input type="radio" name="pos" value="5" />中间</td>
				<td><input type="radio" name="pos" value="6" />右中</td>
			</tr>
			<tr>
				<td><input type="radio" name="pos" value="7" />左下</td>
				<td><input type="radio" name="pos" value="8" />中下</td>
				<td><input type="radio" name="pos" value="9" />右下</td>
			</tr>
		</table>
		<input type="submit" name="submit" value="生成" />
		</form>
		<hr />
		<img src="newImage.jpg" />
	</body>
</html>