#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QJsonObject>
#include <QJsonArray>
#include <QJsonValue>
#include <QFile>
#include <list>
#include <QPolygonF>
#include <QJsonDocument>
QJsonObject jsonFromQba(const QByteArray & qbaMessage);
std::list<QPolygonF> lstGetPolygon(const QJsonArray & jsonArr);
void vWriteMifFile(const std::list<QPolygonF> & lstPolygon);
std::list<QPolygonF> lstPolygonFromArray(const QJsonArray & jsonArr);
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
QFile fp("SouthSea.json");
if(fp.open(QIODevice::ReadOnly))
{
QJsonObject jsonObj = jsonFromQba(fp.readAll());
fp.close();
QJsonArray jsonArr = jsonObj.value("features").toArray();
std::list<QPolygonF> lstIslands = lstGetPolygon(jsonArr);
vWriteMifFile(lstIslands);
}
}
MainWindow::~MainWindow()
{
delete ui;
}
QJsonObject jsonFromQba(const QByteArray & qbaMessage)
{
//QString 转Json
QJsonDocument jsonDocumen = QJsonDocument::fromJson(qbaMessage);
QJsonObject jsonObject = jsonDocumen.object();
return jsonObject;
}
std::list<QPolygonF> lstGetPolygon(const QJsonArray & jsonArr)
{
std::list<QPolygonF> lstRet;
for(const auto & jsonVal: jsonArr)
{
QJsonValue jsonGeom = jsonVal.toObject().value("geometry");
if (jsonGeom.isObject())
{
QJsonValue jsonValCood = jsonGeom.toObject().value("coordinates");
QJsonArray jsonArrCoord = jsonValCood.toArray();
std::list<QPolygonF> lstPloygon = lstPolygonFromArray(jsonArrCoord);
lstRet.splice(lstRet.end(), lstPloygon);
}
}
return lstRet;
}
void vWriteMifFile(const std::list<QPolygonF> & lstPolygon)
{
QFile fp("SouthSea.mif");
if(fp.open(QFile::WriteOnly))
{
QString qstrRegion = QString("Region %1\n").arg(lstPolygon.size());
fp.write(qstrRegion.toLatin1());
for(const auto & polygon: lstPolygon)
{
QString qstrPoints = QString(" %1\n").arg(polygon.size());
fp.write(qstrPoints.toLatin1());
for(const auto & pnt: polygon)
{
int iLong = pnt.x() * 1000000;
int iLat = pnt.y() * 1000000;
QString qstrPnt =
QString("%1.%2 %3.%4\n").
arg(iLong/1000000).arg(iLong%1000000, 6, 10, QChar('0')).
arg(iLat / 1000000).arg(iLat % 1000000, 6, 10, QChar('0'));
fp.write(qstrPnt.toLatin1());
}
}
fp.close();
}
}
//下面的函数将geoJson的coordinates的坐标解析出来
std::list<QPolygonF> lstPolygonFromArray(const QJsonArray & jsonArr)
{
std::list<QPolygonF> lstRet;
//jsonArr是多元数组元素,每一个元素是一个PolygonF
for(const auto & jsonVal: jsonArr)
{
auto jsonPolygon = jsonVal.toArray();
if(1 == jsonPolygon.size())
{
QPolygonF plgn;
auto jsonLine = jsonPolygon.at(0).toArray();
for(const auto & jsonVertex: jsonLine)
{
auto jsonLongLat = jsonVertex.toArray();
if(jsonLongLat.size() == 2)
plgn<<QPointF(jsonLongLat.at(0).toDouble(), jsonLongLat.at(1).toDouble());
}
lstRet.push_back(plgn);
}
}
return lstRet;
}
Qt程序，将三沙市的GeoJson格式数据转化为mif文件
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2022-11-02
15:35:50
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SouthSea.rar （68个子文件） 
SouthSea .vs SouthSea v16 
Browse.VC.db 17.06MB .suo 32KB ipch AutoPCH 41ce31960070ac22 MAIN.ipch 66.06MB 90ce75a81e4267d2 MAINWINDOW.ipch 71.69MB SouthSea.vcxproj 14KB SouthSea.mif 13KB SouthSea.json 14KB SouthSea.vcxproj.filters 3KB .git index 457B hooks fsmonitor-watchman.sample 3KB pre-push.sample 1KB prepare-commit-msg.sample 1KB applypatch-msg.sample 478B pre-commit.sample 2KB pre-receive.sample 544B pre-applypatch.sample 424B commit-msg.sample 896B pre-rebase.sample 5KB update.sample 4KB post-update.sample 189B config 130B description 73B refs tags heads master 41B logs refs heads master 335B HEAD 335B objects 60 50363fa71ed2da04105077f9fef06150d05ee2 304B a3 948a91785f23b0d16b2459b21c04ee7f0a845e 194B 2d 454221473539790591e67febbccda445f70070 1KB 5c 32b986547cfceb4ae2606287aa10a09bcc3ac4 207B 27 c8768d0a59ea07ae62a67063d2e666c7e20299 173B info 55 3c25d76df876b854bb54eff7e51c9bbbd87106 172B 3f 57321d5dbe648c7fd642c5009b5417ece0ad4d 222B 77 fa066943d458f2d5652c2f6d41b4baadb7820c 145B pack 9b 30b51dbbebc9e0ccfe08c080066fad452695df 1KB b4 8f94ec827033ef073fb3c7f060837e90b935ec 141B info exclude 240B COMMIT_EDITMSG 50B HEAD 23B SouthSea.vcxproj.user 725B SouthSea.sln 937B x64 Debug vc120.pdb 1.46MB mainwindow.obj 490KB moc_mainwindow.obj 173KB main.obj 179KB SouthSea.log 2KB SouthSea.tlog CL.write.1.tlog 1KB CL.read.1.tlog 74KB custombuild.read.1.tlog 348B SouthSea.lastbuildstate 162B cl.command.1.tlog 4KB link.write.1.tlog 608B link.command.1.tlog 2KB link.read.1.tlog 3KB custombuild.write.1.tlog 434B custombuild.command.1.tlog 2KB main.cpp 183B mainwindow.ui 654B GeneratedFiles Release ui_mainwindow.h 2KB Debug moc_mainwindow.cpp 3KB SouthSea.v12.suo 20KB debug SouthSea.ilk 1.36MB
SouthSea.exe 112KB SouthSea.pdb 2.36MB mainwindow.cpp 3KB mainwindow.h 313B SouthSea.sdf 22.75MB 三沙市.geoJson 14KB SouthSea.pro 381B
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