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yoshop/source/application/common/service/qrcode/bargain/Goods.php

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2020-04-25 22:20:29 +08:00
<?php
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();
}
}