THINKPHP 生成推广海报图片

今天在开发中需要用到开发宣传海报  今天我发一下大概的方法

方法函数

/**
 * 生成宣传海报
 * @param array  参数,包括图片和文字
 * @param string  $filename 生成海报文件名,不传此参数则不生成文件,直接输出图片
 * @return [type] [description]
 */
function createPoster1($config = array() , $filename = "") {
    //如果要看报什么错，可以先注释调这个header
    //if(empty($filename)) header("content-type: image/png");
    if (empty($filename)) header("content-type: image/png");
    $imageDefault = array(
        'left' => 0,
        'top' => 0,
        'right' => 0,
        'bottom' => 0,
        'width' => 100,
        'height' => 100,
        'opacity' => 100
    );
    $textDefault = array(
        'text' => '',
        'left' => 0,
        'top' => 0,
        'fontSize' => 32, //字号
        'fontColor' => '255,255,255', //字体颜色
        'angle' => 0,
    );
    $background = $config['background']; //海报最底层得背景
    //背景方法
    $backgroundInfo = getimagesize($background);
    $backgroundFun = 'imagecreatefrom' . image_type_to_extension($backgroundInfo[2], false);
    $background = $backgroundFun($background);
    $backgroundWidth = imagesx($background); //背景宽度
    $backgroundHeight = imagesy($background); //背景高度
    $imageRes = imageCreatetruecolor($backgroundWidth, $backgroundHeight);
    $color = imagecolorallocate($imageRes, 0, 0, 0);
    imagefill($imageRes, 0, 0, $color);
    imagecopyresampled($imageRes, $background, 0, 0, 0, 0, imagesx($background) , imagesy($background) , imagesx($background) , imagesy($background));
    //处理了图片
    if (!empty($config['image'])) {
        foreach ($config['image'] as $key => $val) {
            $val = array_merge($imageDefault, $val);
            $info = getimagesize($val['url']);
            $function = 'imagecreatefrom' . image_type_to_extension($info[2], false);
            if ($val['stream']) { //如果传的是字符串图像流
                $info = getimagesizefromstring($val['url']);
                $function = 'imagecreatefromstring';
            }
            $res = $function($val['url']);
            $resWidth = $info[0];
            $resHeight = $info[1];
            //建立画板 ，缩放图片至指定尺寸
            $canvas = imagecreatetruecolor($val['width'], $val['height']);
            imagefill($canvas, 0, 0, $color);
            //如果是透明的gif或png做透明处理
            $ext = pathinfo($val['url']);
            if (array_key_exists('extension',$ext)) {
                if ($ext['extension'] == 'gif' || $ext['extension'] == 'png') {
                    imageColorTransparent($canvas, $color); //颜色透明
                    
                }
            }
            //关键函数，参数（目标资源，源，目标资源的开始坐标x,y, 源资源的开始坐标x,y,目标资源的宽高w,h,源资源的宽高w,h）
            imagecopyresampled($canvas, $res, 0, 0, 0, 0, $val['width'], $val['height'], $resWidth, $resHeight);
            //$val['left'] = $val['left']<0?$backgroundWidth- abs($val['left']) - $val['width']:$val['left'];
            //如果left小于-1我这做成了计算让其水平居中
            if ($val['left'] < 0) {
                $val['left'] = ceil($backgroundWidth - $val['width']) / 2;
            }
            $val['top'] = $val['top'] < 0 ? $backgroundHeight - abs($val['top']) - $val['height'] : $val['top'];
            //放置图像
            imagecopymerge($imageRes, $canvas, $val['left'], $val['top'], $val['right'], $val['bottom'], $val['width'], $val['height'], $val['opacity']); //左，上，右，下，宽度，高度，透明度
            
        }
    }
    //处理文字
    if (!empty($config['text'])) {
        foreach ($config['text'] as $key => $val) {
            $val = array_merge($textDefault, $val);
            list($R, $G, $B) = explode(',', $val['fontColor']);
            $fontColor = imagecolorallocate($imageRes, $R, $G, $B);
            //$val['left'] = $val['left']<0?$backgroundWidth- abs($val['left']):$val['left'];
            //如果left小于-1我这做成了计算让其水平居中
            if ($val['left'] < 0) {
                $fontBox = imagettfbbox($val['fontSize'], 0, $val['fontPath'], $val['text']); //文字水平居中实质
                $val['left'] = ceil(($backgroundWidth - $fontBox[2]) / 2); //计算文字的水平位置
                
            }
            $val['top'] = $val['top'] < 0 ? $backgroundHeight - abs($val['top']) : $val['top'];
            imagettftext($imageRes, $val['fontSize'], $val['angle'], $val['left'], $val['top'], $fontColor, $val['fontPath'], $val['text']);
        }
    }
    //生成图片
    if (!empty($filename)) {
        $res = imagejpeg($imageRes, $filename, 90); //保存到本地
        imagedestroy($imageRes);
        if (!$res) return false;
        return $filename;
    } else {
        header("Content-type:image/png");
        imagejpeg($imageRes); //在浏览器上显示
        imagedestroy($imageRes);
    }
}

 

THINKPHP中使用

    //生成海报
    public function get_poster(){
        $uid = $this->userInfo['uid'];
        $qrInfo = QrcodeService::getTemporaryQrcode('spread',$uid);
        //获取用户信息
        $userinfo = WechatUser::where('uid',$uid)->find()->toArray();
        //dump($userinfo);die;
        //获取海报信息
        $poster = Db::name('system_popover')->where('id',1)->find();
        $config = array(
          'image'=>array(
            array(
              'url'=>$qrInfo['url'],     //二维码地址
              'is_yuan'=>false,          //true图片圆形处理
              'stream'=>0,
              'left'=>-1,               //小于0为小平居中                              
              'top'=>735,
              'right'=>0,
              'width'=>250,             //图像宽
              'height'=>250,            //图像高
              'opacity'=>100            //透明度
            ),
            array(
              'url'=>download_remote_pic($userinfo['headimgurl']),     //头像地址
              'is_yuan'=>true,          //true图片圆形处理
              'stream'=>0,
              'left'=>-1,               //小于0为小平居中                              
              'top'=>532,
              'right'=>0,
              'width'=>132,             //图像宽
              'height'=>132,            //图像高
              'opacity'=>100            //透明度
            ),
          ),
          'text'=>array(
            array(
                'text'=>$userinfo['nickname'],            //文字内容
                'left'=>-1,                              //小于0为小平居中       
                'top'=>600,
                'fontSize'=>28,                         //字号
                'fontColor'=>'90,90,90',                //字体颜色
                'angle'=>0,
                'fontPath'=>ROOT_PATH.'public/static/font/simsunb.ttf',     //字体文件
            )
          ),
          'background'=>'http://'.$_SERVER['HTTP_HOST'].$poster['background'],          //背景图
        );

        $filename = 'public/'.time().'.jpg';
        //echo createPoster($config);
        //$filename为空是真接浏览器显示图片
        echo createPoster($config,$filename);
    }