dyuitTools/dyu/application/common/service/qrcode/bargain/Goods.php

<?php

/**
 *
 * @copyright ©2020 点小铺
 * @author  hanj
 * @link: https://dyuit.com
 * Created by VSCode
 */

namespace app\common\service\qrcode\bargain;

use Grafika\Color;
use Grafika\Grafika;
use app\common\service\qrcode\Base;

class Goods extends Base
{

    // 砍价活动信息
    private $active;

    // 商品信息
    private $goods;

    // 用户id
    private $user_id;

    /**
     * 构造方法
     * Goods constructor.
     * @param $active
     * @param $goods
     * @param $user
     */
    public function __construct($active, $goods, $user)
    {
        parent::__construct();
        // 砍价活动信息
        $this->active = $active;
        // 商品信息
        $this->goods = $goods;
        // 当前用户id
        $this->user_id = $user ? $user['user_id'] : 0;
    }

    /**
     * @return mixed
     * @throws \app\common\exception\BaseException
     * @throws \think\exception\DbException
     * @throws \Exception
     */
    public function getImage()
    {
        // 判断海报图文件存在则直接返回url
        if (file_exists($this->getPosterPath())) {
            return $this->getPosterUrl();
        }
        // 小程序id
        $wxappId = $this->active['wxapp_id'];
        // 商品海报背景图
        $backdrop = __DIR__ . '/../resource/goods_bg.png';
        // 下载商品首图
        $goodsUrl = $this->saveTempImage($wxappId, $this->goods['goods_image'], 'goods');
        // 小程序码参数
        $scene = "aid:{$this->active['active_id']},uid:" . ($this->user_id ?: '');
        // 下载小程序码
        $qrcode = $this->saveQrcode($wxappId, $scene, 'pages/bargain/goods/index');
        // 拼接海报图
        return $this->savePoster($backdrop, $goodsUrl, $qrcode);
    }

    /**
     * 拼接海报图
     * @param $backdrop
     * @param $goodsUrl
     * @param $qrcode
     * @return string
     * @throws \Exception
     */
    private function savePoster($backdrop, $goodsUrl, $qrcode)
    {
        // 实例化图像编辑器
        $editor = Grafika::createEditor(['Gd']);
        // 字体文件路径
        $fontPath = Grafika::fontsDir() . '/' . 'st-heiti-light.ttc';
        // 打开海报背景图
        $editor->open($backdropImage, $backdrop);
        // 打开商品图片
        $editor->open($goodsImage, $goodsUrl);
        // 重设商品图片宽高
        $editor->resizeExact($goodsImage, 690, 690);
        // 商品图片添加到背景图
        $editor->blend($backdropImage, $goodsImage, 'normal', 1.0, 'top-left', 30, 30);
        // 商品名称处理换行
        $fontSize = 30;
        $goodsName = $this->wrapText($fontSize, 0, $fontPath, $this->goods['goods_name'], 680, 2);
        // 写入商品名称
        $editor->text($backdropImage, $goodsName, $fontSize, 30, 750, new Color('#333333'), $fontPath);
        // 写入商品价格
        $editor->text($backdropImage, $this->active['floor_price'], 38, 62, 964, new Color('#ff4444'));
        // 打开小程序码
        $editor->open($qrcodeImage, $qrcode);
        // 重设小程序码宽高
        $editor->resizeExact($qrcodeImage, 140, 140);
        // 小程序码添加到背景图
        $editor->blend($backdropImage, $qrcodeImage, 'normal', 1.0, 'top-left', 570, 914);
        // 保存图片
        $editor->save($backdropImage, $this->getPosterPath());
        return $this->getPosterUrl();
    }

    /**
     * 处理文字超出长度自动换行
     * @param integer $fontsize 字体大小
     * @param integer $angle 角度
     * @param string $fontface 字体名称
     * @param string $string 字符串
     * @param integer $width 预设宽度
     * @param null $max_line 最多行数
     * @return string
     */
    private function wrapText($fontsize, $angle, $fontface, $string, $width, $max_line = null)
    {
        // 这几个变量分别是 字体大小, 角度, 字体名称, 字符串, 预设宽度
        $content = "";
        // 将字符串拆分成一个个单字 保存到数组 letter 中
        $letter = [];
        for ($i = 0; $i < mb_strlen($string, 'UTF-8'); $i++) {
            $letter[] = mb_substr($string, $i, 1, 'UTF-8');
        }
        $line_count = 0;
        foreach ($letter as $l) {
            $testbox = imagettfbbox($fontsize, $angle, $fontface, $content . ' ' . $l);
            // 判断拼接后的字符串是否超过预设的宽度
            if (($testbox[2] > $width) && ($content !== "")) {
                $line_count++;
                if ($max_line && $line_count >= $max_line) {
                    $content = mb_substr($content, 0, -1, 'UTF-8') . "...";
                    break;
                }
                $content .= "\n";
            }
            $content .= $l;
        }
        return $content;
    }

    /**
     * 海报图文件路径
     * @return string
     */
    private function getPosterPath()
    {
        // 保存路径
        $tempPath = WEB_PATH . 'temp' . '/' . $this->active['wxapp_id'] . '/';
        !is_dir($tempPath) && mkdir($tempPath, 0755, true);
        return $tempPath . $this->getPosterName();
    }

    /**
     * 海报图文件名称
     * @return string
     */
    private function getPosterName()
    {
        return 'bargain_active_' . md5("{$this->user_id}_{$this->active['active_id']}") . '.png';
    }

    /**
     * 海报图url
     * @return string
     */
    private function getPosterUrl()
    {
        return \base_url() . 'temp/' . $this->active['wxapp_id'] . '/' . $this->getPosterName() . '?t=' . time();
    }

}