QT编写地图实现获取区域边界

void frmMapBoundary::getBoundary()
{
    //判断当前索引对应的省会的复选框有没有勾选,没有勾选则找到下一个勾选的
    int count = names.count();
    while (indexMain < count - 1 && !cks.at(indexMain)->isChecked()) {
        indexMain++;
        indexSub = 0;
    }

    //到了最后一个省会的索引,停止定时器
    if (indexMain == count || !cks.at(indexMain)->isChecked()) {
        on_btnStop_clicked();
        return;
    }

    //下载到省会的最后一个县,索引自动跳到下一个省会
    QStringList list = names.at(indexMain);
    if (indexSub == list.count()) {
        indexMain++;
        indexSub = 0;
        getBoundary();
        return;
    }

    QString name = list.at(indexSub);
    addBoundary(name);
    indexSub++;

    //更新进度条
    int value = bars.at(indexMain)->value();
    bars.at(indexMain)->setValue(value + 1);
    ui->txtTip->setText(name);
}

void frmMapBoundary::addBoundary()
{
    //开启编辑状态
    QString name = ui->cboxName->currentText();
    addBoundary(name, true);
}

void frmMapBoundary::addBoundary(const QString &name, bool edit)
{
    currentName = name;
    QString js = QString("addBoundary('%1', true, %2)").arg(name).arg(edit ? "true" : "false");
    runJs(js);
}

void frmMapBoundary::saveBoundary(const QString &fileName, const QVariant &data)
{
    //传过来的是行政区划的边界点坐标集合,存储到js文件
    //可能会有多个数据,比如台湾的金门岛,都是独立的区域形状,存入数组
    QStringList boundarys;
    QStringList list = data.toString().split("|");
    foreach (QString points, list) {
        boundarys << QString("{'points': '%1'}").arg(points);
    }

    //最终js文件内容数据
    QString boundary = QString("var boundarys = [%1]").arg(boundarys.join(", "));
    QFile file(fileName);
    if (file.open(QFile::WriteOnly | QFile::Truncate)) {
        QTextStream out(&file);
#if (QT_VERSION < QT_VERSION_CHECK(6,0,0))
        out.setCodec("utf-8");
#endif
        out << boundary;
    }
}