php 给图片加水印
2020-12-13 02:29
                         标签:des   class   code   ext   color   c    昨天下午同事问我一个php的问题,就是给图片加水印,php我也一知半解,网上资料找了一通,自己就写了一个加水印的php类。 具体代码如下: 上面代码有一些纰漏: 1,水印生成的位置,比如说可以是中间,右上角,右下角,等等。需要完善。 2,如果是加文字水印,文字水印的位置怎么计算?计算每个文字的宽度和高度?这个还有待完善。 3,异常的处理。php里面处理异常,我貌似还没有接触过。 上面代码调用方式:   php 给图片加水印,搜素材,soscw.com php 给图片加水印 标签:des   class   code   ext   color   c    原文地址:http://www.cnblogs.com/tony-jingzhou/p/3718574.html
 
       
    
       
class WaterGener{
    private 
$default_text="Just for test"; 
    private 
$default_waterpic="girl.jpg";
    private 
$default_qulity=75;
    //默认使用的字体
    private 
$font = ‘simhei.ttf‘; //定义字体
    //默认的padding 的值
    private 
$padding=5;
    /**
    构造函数
    **/
    function 
__construct(){
    }
    //获取图片类型
    private 
function getImage($path){
        if(!empty($path) && file_exists($path)) {
            $water_info = @getimagesize($path);
            $water_im;
            switch($water_info[2])   {    //取得水印图片的格式  
                 case 
1:$water_im = @imagecreatefromgif($path);break;
                 case 
2:$water_im = @imagecreatefromjpeg($path);break;
                 case 
3:$water_im = @imagecreatefrompng($path);break;
                 default:return 
1;
             }
             return 
$water_im;
        }
        return 
-1;
    }
    public 
function buildWaterImage($picture,$logo="",$savePath="demo.jpg"){
        //需要判断图片的类型,水印图片的类型
        if(!empty($path) && file_exists($path))return 
-1;
        $logoImage =$this->getImage($logo===""?$this->default_waterpic:$logo);
        $photoImage =$this->getImage($picture);
        if($photoImage==-1){
            echo "没有找到图片";
            return; 
        }
        imagealphablending($photoImage, true);
        $logo_size = getimagesize($logo); 
        $logoW = $logo_size[0];
        $logoH = $logo_size[1];
        $picture_size = getimagesize($picture); 
        ImageCopy($photoImage, $logoImage, $picture_size[0]-$logoW-$this->padding, $picture_size[1]-$logoH-$this->padding, 0, 0, $logoW, $logoH);
        ImageJPEG($photoImage,$savePath,$this->default_qulity); // output to browser or file
        ImageDestroy($photoImage);
        ImageDestroy($logoImage);
        echo "success...";
    } 
    public 
function buildWaterText($picture,$text="",$savePath="demo.jpg"){
        //需要判断
        $photoImage = $this->getImage($picture);
        ImageAlphaBlending($photoImage, true);
        $picture_size = getimagesize($picture); 
        $textcolor = imagecolorallocate($photoImage, 255,255, 255);
        //解决乱码问题
        //$text = iconv("GB2312", "UTF-8", $text); //将中文字转换为UTF8 
        imagettftext($photoImage, 20, 0, $this->padding, $picture_size[1]-($this->padding*4), $textcolor, $this->font, $text);//将文字写到图片中
        //imagestring($photoImage, 5, 0, 0,$text, $textcolor);
        ImageJPEG($photoImage,$savePath,$this->default_qulity); // output to browser
        ImageDestroy($photoImage);
    } 
}?>
 
       
    
       
include_once "water.class.php";
$water=new 
WaterGener();
$water->buildWaterImage("girl.jpg","logo.gif","demo1.jpg");
$water->buildWaterText("girl.jpg","开源中国");
?>