[Qt]显示地图-3 切换地图和图片

——pro————————–
QT += core gui location positioning
QT += quick widgets quickwidgets

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++17

# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
imagewidget.cpp \
main.cpp \
mainwindow.cpp

HEADERS += \
imagewidget.h \
mainwindow.h

FORMS += \
mainwindow.ui

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

DISTFILES += \
map.qml

RESOURCES += \
src.qrc

———————mainwindow.h————————-
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
Q_OBJECT

public:

bool isQmlView =false;

MainWindow(QWidget *parent = nullptr);
~MainWindow();

// 更新坐标的接口
void updateCoordinates(double latA, double lonA, double latB, double lonB);
private slots:
void on_zoomInButton_clicked();
void on_zoomOutButton_clicked();
void on_p2m_clicked();
private:
Ui::MainWindow *ui;
private :
void zoomOut();
void zoomIn();
};

#endif // MAINWINDOW_H

———————main.cpp—————————-
#include “mainwindow.h”
#include
#include
#include “imagewidget.h”

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();

// 更新坐标到新位置
// w.updateCoordinates(34.0522, -118.2437, 36.7783, -119.4179); // A: Los Angeles, B: Fresno

qDebug()<<"11"; return a.exec(); } ---------------------mainwindow.cpp------------------------------------- #include "mainwindow.h" #include "ui_mainwindow.h" #include "imagewidget.h" #include
#include
#include
#include
#include
#include

MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);

// 获取 QQuickWidget
QQuickWidget *quickWidget = ui->quickWidget;

// 设置 QML 文件路径
quickWidget->setSource(QUrl(QStringLiteral(“qrc:/map.qml”)));
quickWidget->setResizeMode(QQuickWidget::SizeRootObjectToView);

// 获取 QML 上下文
QQmlContext *context = quickWidget->rootContext();

// 默认坐标
QVariant coordinateA = QVariant::fromValue(QGeoCoordinate(37.7749, -122.4194)); // San Francisco
QVariant coordinateB = QVariant::fromValue(QGeoCoordinate(37.8044, -122.2711)); // Oakland

// 传递默认坐标到 QML
context->setContextProperty(“coordinateA”, coordinateA);
context->setContextProperty(“coordinateB”, coordinateB);

// 连接按钮到槽函数
connect(ui->zoomInButton, &QPushButton::clicked, this, &MainWindow::on_zoomInButton_clicked);
connect(ui->zoomOutButton, &QPushButton::clicked, this, &MainWindow::on_zoomOutButton_clicked);

}

void MainWindow::updateCoordinates(double latA, double lonA, double latB, double lonB)
{
QQuickWidget *quickWidget = ui->quickWidget;
QQuickItem *rootObject = quickWidget->rootObject(); // 修改为 QQuickItem*

if (rootObject) {
// 更新 QML 的属性
rootObject->setProperty(“coordinateA”, QVariant::fromValue(QGeoCoordinate(latA, lonA)));
rootObject->setProperty(“coordinateB”, QVariant::fromValue(QGeoCoordinate(latB, lonB)));
} else {
qWarning() << "Root object is null!"; } } // 放大地图 void MainWindow::zoomIn() { } // 缩小地图 void MainWindow::zoomOut() { } MainWindow::~MainWindow() { delete ui; } void MainWindow::on_zoomInButton_clicked() { QQuickWidget *quickWidget = ui->quickWidget;
QQuickItem *rootObject = quickWidget->rootObject();

if (rootObject) {
double currentZoom = rootObject->property(“zoomLevelVal”).toDouble();
double newZoom = currentZoom + 1.0; // 增加 zoomLevel
rootObject->setProperty(“zoomLevelVal”, newZoom);
}
}

void MainWindow::on_zoomOutButton_clicked()
{

QQuickWidget *quickWidget = ui->quickWidget;
QQuickItem *rootObject = quickWidget->rootObject();

if (rootObject) {
double currentZoom = rootObject->property(“zoomLevelVal”).toDouble();
double newZoom = currentZoom – 1.0; // 减少 zoomLevel
rootObject->setProperty(“zoomLevelVal”, newZoom);
qDebug()<update();
}
}

void MainWindow::on_p2m_clicked()
{
isQmlView = !isQmlView;

if (isQmlView) {
ui->quickWidget->show();
ui->label->hide();
} else {
ui->quickWidget->hide();
ui->label->show();
//imageWidget->repaint();
}
}

———————-map.qml——————————
import QtQuick 2.15
import QtQuick.Controls 2.15
import QtLocation 5.15
import QtPositioning 5.15

Item {
width: 800
height: 600

Plugin {
id: mapPlugin
name: “osm” // 使用 OpenStreetMap 插件
}

// 坐标属性，可通过 C++ 更新
property var coordinateA: QtPositioning.coordinate(37.7749, -122.4194)
property var coordinateB: QtPositioning.coordinate(37.8044, -122.2711)
property real zoomLevelVal: 10

Map {
anchors.fill: parent
plugin: mapPlugin
center: coordinateA // 默认以 A 为中心
zoomLevel: zoomLevelVal // 使用绑定的 zoomLevel 属性

// 显示从 A 到 B 的路径
MapPolyline {
line.width: 1
line.color: “red”
path: [coordinateA, coordinateB]
}
}
}