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php生成缩略图,加水印类

Jun 13, 2016 am 10:53 AM
htphppublic welfareaddLibraryoperatewatermarkgenerateofSimplekindlecture hallthis

这个一个简单的GD库操作

 

[php]  

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/*** 

 想操作图片 

 先得把图片的大小,类型信息得到 

 

 水印:就是把指定的水印复制到目标上,并加透明效果 

 

 缩略图:就是把大图片复制到小尺寸画面上 

 ***/  

  

class ImageTool {  

    // imageInfo 分析图片的信息  

    // return array()  

    public static function imageInfo($image) {  

        // 判断图片是否存在  

        if (!file_exists($image)) {  

            return false;  

        }  

  

        $info = getimagesize($image);  

  

        if ($info == false) {  

            return false;  

        }  

  

        // 此时info分析出来,是一个数组  

        $img['width'] = $info[0];  

        $img['height'] = $info[1];  

        $img['ext'] = substr($info['mime'], strpos($info['mime'], '/') + 1);  

  

        return $img;  

    }  

  

    /* 

     加水印功能 

     parm String $dst 等操作图片 

     parm String $water 水印小图 

     parm String $save,不填则默认替换原始图 

     */  

    public static function water($dst, $water, $save = NULL, $pos = 2, $alpha = 50) {  

        // 先保证2个图片存在  

        if (!file_exists($dst) || !file_exists($water)) {  

            return false;  

        }  

  

        // 首先保证水印不能比待操作图片还大  

        $dinfo = self::imageInfo($dst);  

        $winfo = self::imageInfo($water);  

  

        if ($winfo['height'] > $dinfo['height'] || $winfo['width'] > $dinfo['width']) {  

            return false;  

        }  

  

        // 两张图,读到画布上! 但是图片可能是png,可能是jpeg,用什么函数读?  

        $dfunc = 'imagecreatefrom' . $dinfo['ext'];  

        $wfunc = 'imagecreatefrom' . $winfo['ext'];  

  

        if (!function_exists($dfunc) || !function_exists($wfunc)) {  

            return false;  

        }  www.2cto.com

  

        // 动态加载函数来创建画布  

        $dim = $dfunc($dst);  

        // 创建待操作的画布  

        $wim = $wfunc($water);  

        // 创建水印画布  

  

        // 根据水印的位置 计算粘贴的坐标  

        switch($pos) {  

            case 0 :  

                // 左上角  

                $posx = 0;  

                $posy = 0;  

                break;  

  

            case 1 :  

                // 右上角  

                $posx = $dinfo['width'] - $winfo['width'];  

                $posy = 0;  

                break;  

  

            case 3 :  

                // 左下角  

                $posx = 0;  

                $posy = $dinfo['height'] - $winfo['height'];  

                break;  

  

            default :  

                $posx = $dinfo['width'] - $winfo['width'];  

                $posy = $dinfo['height'] - $winfo['height'];  

        }  

  

        // 加水印  

        imagecopymerge($dim, $wim, $posx, $posy, 0, 0, $winfo['width'], $winfo['height'], $alpha);  

  

        // 保存  

        if (!$save) {  

            $save = $dst;  

            unlink($dst);  

            // 删除原图  

        }  

  

        $createfunc = 'image' . $dinfo['ext'];  

        $createfunc($dim, $save);  

  

        imagedestroy($dim);  

        imagedestroy($wim);  

  

        return true;  

    }  

  

    /** 

     thumb 生成缩略图 

     等比例缩放,两边留白 

     **/  

    public static function thumb($dst, $save = NULL, $width = 200, $height = 200) {  

        // 首先判断待处理的图片存不存在  

        $dinfo = self::imageInfo($dst);  

        if ($dinfo == false) {  

            return false;  

        }  

  

        // 计算缩放比例  

        $calc = min($width / $dinfo['width'], $height / $dinfo['height']);  

  

        // 创建原始图的画布  

        $dfunc = 'imagecreatefrom' . $dinfo['ext'];  

        $dim = $dfunc($dst);  

  

        // 创建缩略画布  

        $tim = imagecreatetruecolor($width, $height);  

  

        // 创建白色填充缩略画布  

        $white = imagecolorallocate($tim, 255, 255, 255);  

  

        // 填充缩略画布  

        imagefill($tim, 0, 0, $white);  

  

        // 复制并缩略  

        $dwidth = (int)$dinfo['width'] * $calc;  

        $dheight = (int)$dinfo['height'] * $calc;  

  

        $paddingx = (int)($width - $dwidth) / 2;  

        $paddingy = (int)($height - $dheight) / 2;  

  

        imagecopyresampled($tim, $dim, $paddingx, $paddingy, 0, 0, $dwidth, $dheight, $dinfo['width'], $dinfo['height']);  

  

        // 保存图片  

        if (!$save) {  

            $save = $dst;  

            unlink($dst);  

        }  

  

        $createfunc = 'image' . $dinfo['ext'];  

        $createfunc($tim, $save);  

  

        imagedestroy($dim);  

        imagedestroy($tim);  

  

        return true;  

  

    }  

  

}  

  

// print_r(ImageTool::imageInfo('./home.jpg'));  

/*  www.2cto.com

 echo ImageTool::water('./home.jpg','./smallfeng.png','home1.jpg',0)?'OK':'FAIL'; 

 echo ImageTool::water('./home.jpg','./smallfeng.png','home2.jpg',1)?'OK':'FAIL'; 

 echo ImageTool::water('./home.jpg','./smallfeng.png','home3.jpg',2)?'OK':'FAIL'; 

 echo ImageTool::water('./home.jpg','./smallfeng.png','home4.jpg',3)?'OK':'FAIL'; 

 */  

 

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