<?php



// +----------------------------------------------------------------------

// | EcTouch [ 专注移动电商: 商创网络科技 ]

// +----------------------------------------------------------------------

// | Copyright (c) 2014 http://ectouch.cn All rights reserved.

// +----------------------------------------------------------------------

// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )

// +----------------------------------------------------------------------

// | Author: EcTouch Team <zhong@ecmoban.com> (QQ: 2880175560)

// +----------------------------------------------------------------------



//生成图像缩略图和生成验证码

class Image {



    //生成图像验证码

    static public function buildImageVerify($width = 48, $height = 22, $randval = NULL, $verifyName = 'verify') {

        if (!isset($_SESSION)) {

            session_start(); //如果没有开启，session，则开启session

        }

        $randval = empty($randval) ? ("" . rand(1000, 9999)) : $randval;

        $_SESSION[$verifyName] = $randval;

        $length = 4;

        $width = ($length * 10 + 10) > $width ? $length * 10 + 10 : $width;

        $im = imagecreate($width, $height);

        $r = array(225, 255, 255, 223);

        $g = array(225, 236, 237, 255);

        $b = array(225, 236, 166, 125);

        $key = mt_rand(0, 3);



        $backColor = imagecolorallocate($im, $r[$key], $g[$key], $b[$key]);    //背景色（随机）

        $borderColor = imagecolorallocate($im, 100, 100, 100);                    //边框色

        $pointColor = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));                 //点颜色



        @imagefilledrectangle($im, 0, 0, $width - 1, $height - 1, $backColor);

        @imagerectangle($im, 0, 0, $width - 1, $height - 1, $borderColor);

        $stringColor = imagecolorallocate($im, mt_rand(0, 200), mt_rand(0, 120), mt_rand(0, 120));

        // 干扰

        for ($i = 0; $i < 10; $i++) {

            $fontcolor = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));

            imagearc($im, mt_rand(-10, $width), mt_rand(-10, $height), mt_rand(30, 300), mt_rand(20, 200), 55, 44, $fontcolor);

        }

        for ($i = 0; $i < 25; $i++) {

            $fontcolor = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));

            imagesetpixel($im, mt_rand(0, $width), mt_rand(0, $height), $pointColor);

        }

        for ($i = 0; $i < $length; $i++) {

            imagestring($im, 5, $i * 10 + 5, mt_rand(1, 8), $randval{$i}, $stringColor);

        }

        self::output($im, 'png');

    }



    //生成缩略图

    static public function thumb($image, $thumbname, $domain = 'public', $maxWidth = 200, $maxHeight = 50, $interlace = true) {

        // 获取原图信息

        $info = self::getImageInfo($image);

        if ($info !== false) {

            $srcWidth = $info['width'];

            $srcHeight = $info['height'];

            $type = strtolower($info['type']);

            $interlace = $interlace ? 1 : 0;

            unset($info);

            $scale = min($maxWidth / $srcWidth, $maxHeight / $srcHeight); // 计算缩放比例

            if ($scale >= 1) {  // 超过原图大小不再缩略

                $width = $srcWidth;

                $height = $srcHeight;

            } else {  // 缩略图尺寸

                $width = (int) ($srcWidth * $scale);

                $height = (int) ($srcHeight * $scale);

            }



            //sae平台上图片处理

            if (class_exists('SaeStorage')) {

                $saeStorage = new SaeStorage();

                $saeImage = new SaeImage();

                $saeImage->setData(file_get_contents($image));

                $saeImage->resize($width, $height);

                $thumbname = str_replace(array('../', './'), '', $thumbname);

                return $saeStorage->write($domain, $thumbname, $saeImage->exec());

            }



            // 载入原图

            $createFun = 'ImageCreateFrom' . ($type == 'jpg' ? 'jpeg' : $type);

            $srcImg = $createFun($image);



            //创建缩略图

            if ($type != 'gif' && function_exists('imagecreatetruecolor')) {

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

            } else {

                $thumbImg = imagecreate($width, $height);

            }

            // 复制图片

            if (function_exists("ImageCopyResampled")) {

                imagecopyresampled($thumbImg, $srcImg, 0, 0, 0, 0, $width, $height, $srcWidth, $srcHeight);

            } else {

                imagecopyresized($thumbImg, $srcImg, 0, 0, 0, 0, $width, $height, $srcWidth, $srcHeight);

            }

            if ('gif' == $type || 'png' == $type) {

                $background_color = imagecolorallocate($thumbImg, 0, 255, 0);  //  指派一个绿色

                imagecolortransparent($thumbImg, $background_color);  //  设置为透明色，若注释掉该行则输出绿色的图

            }

            // 对jpeg图形设置隔行扫描

            if ('jpg' == $type || 'jpeg' == $type) {

                imageinterlace($thumbImg, $interlace);

            }

            $dir = dirname($thumbname);

            if (!is_dir($dir)) {

                @mkdir($dir, 0777, true);

            }

            // 生成图片

            $imageFun = 'image' . ($type == 'jpg' ? 'jpeg' : $type);

            $imageFun($thumbImg, $thumbname);

            imagedestroy($thumbImg);

            imagedestroy($srcImg);

            return $thumbname;

        }

        return false;

    }



    /**

     * 图片水印

     * @$image  原图

     * @$water 水印图片

     * @$$waterPos 水印位置(0-9) 0为随机，其他代表上中下9个部分位置

     */

    static public function water($image, $water, $waterPos = 9) {

        //检查图片是否存在

        if (!file_exists($image) || !file_exists($water))

            return false;

        //读取原图像文件

        $imageInfo = self::getImageInfo($image);

        $image_w = $imageInfo['width']; //取得水印图片的宽

        $image_h = $imageInfo['height']; //取得水印图片的高

        $imageFun = "imagecreatefrom" . $imageInfo['type'];

        $image_im = $imageFun($image);



        //读取水印文件

        $waterInfo = self::getImageInfo($water);

        $w = $water_w = $waterInfo['width']; //取得水印图片的宽

        $h = $water_h = $waterInfo['height']; //取得水印图片的高

        $waterFun = "imagecreatefrom" . $waterInfo['type'];

        $water_im = $waterFun($water);



        switch ($waterPos) {

            case 0: //随机

                $posX = rand(0, ($image_w - $w));

                $posY = rand(0, ($image_h - $h));

                break;

            case 1: //1为顶端居左

                $posX = 0;

                $posY = 0;

                break;

            case 2: //2为顶端居中

                $posX = ($image_w - $w) / 2;

                $posY = 0;

                break;

            case 3: //3为顶端居右

                $posX = $image_w - $w;

                $posY = 0;

                break;

            case 4: //4为中部居左

                $posX = 0;

                $posY = ($image_h - $h) / 2;

                break;

            case 5: //5为中部居中

                $posX = ($image_w - $w) / 2;

                $posY = ($image_h - $h) / 2;

                break;

            case 6: //6为中部居右

                $posX = $image_w - $w;

                $posY = ($image_h - $h) / 2;

                break;

            case 7: //7为底端居左

                $posX = 0;

                $posY = $image_h - $h;

                break;

            case 8: //8为底端居中

                $posX = ($image_w - $w) / 2;

                $posY = $image_h - $h;

                break;

            case 9: //9为底端居右

                $posX = $image_w - $w;

                $posY = $image_h - $h;

                break;

            default: //随机

                $posX = rand(0, ($image_w - $w));

                $posY = rand(0, ($image_h - $h));

                break;

        }

        //设定图像的混色模式        

        imagealphablending($image_im, true);

        imagecopy($image_im, $water_im, $posX, $posY, 0, 0, $water_w, $water_h); //拷贝水印到目标文件

        //生成水印后的图片

        $bulitImg = "image" . $imageInfo['type'];

        $bulitImg($image_im, $image);

        //释放内存

        $waterInfo = $imageInfo = null;

        imagedestroy($image_im);

    }



    static protected function getImageInfo($img) {

        $imageInfo = getimagesize($img);

        if ($imageInfo !== false) {

            $imageType = strtolower(substr(image_type_to_extension($imageInfo[2]), 1));

            $imageSize = filesize($img);

            $info = array(

                "width" => $imageInfo[0],

                "height" => $imageInfo[1],

                "type" => $imageType,

                "size" => $imageSize,

                "mime" => $imageInfo['mime']

            );

            return $info;

        } else {

            return false;

        }

    }



    static protected function output($im, $type = 'png', $filename = '') {

        header("Content-type: image/" . $type);

        $ImageFun = 'image' . $type;

        if (empty($filename)) {

            $ImageFun($im);

        } else {

            $ImageFun($im, $filename);

        }

        imagedestroy($im);

        exit;

    }



}



?>