coordinatereceiver.h

#include <QObject>
#include <QPointF>
#include <QVector>
#include <QDebug>
// 定义全局变量来存储坐标点
//QVector<QPointF> globalCoordinates;

class CoordinateReceiver : public QObject
{
    Q_OBJECT
public:
    explicit CoordinateReceiver(QObject *parent = nullptr) : QObject(parent) {}

public slots:
    // 用于接收 QML 发送的坐标点列表
    void receiveCoordinates(QVector<QPointF> coordinates1) {

        for (const auto &point : coordinates1) {
            qDebug() << "Coordinate:" << point;
        }
    }
};

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QQmlContext>
#include "coordinatereceiver.h"

int main(int argc, char *argv[]) {
    QGuiApplication app(argc, argv);
    QQmlApplicationEngine engine;

    CoordinateReceiver handler;
    engine.rootContext()->setContextProperty("CoordinateReceiver", &handler);

    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
    if (engine.rootObjects().isEmpty())
        return -1;

    return app.exec();
}

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.12

Window {
    visible: true
    width: 640
    height: 480
    title: "Send Coordinates to C++"

    Button {
        id: sendButton
        text: "Send Coordinates"
        anchors.centerIn: parent
        onClicked: {
            var coordinates = []
            for (var i = 0; i < 30; ++i) {
                // 这里简单生成一些示例坐标点，你可以根据实际需求修改
                coordinates.push(Qt.point(i * 10, i * 20))
            }
            // 发送坐标点到 C++ 端
            CoordinateReceiver.receiveCoordinates(coordinates)
        }
    }
}