qt 绘制三维坐标图

您可以使用Qt的3D模块来绘制三维坐标图。下面是一个简单的示例代码，演示如何使用Qt绘制一个简单的三维坐标图：

#include <Qt3DCore/QEntity>
#include <Qt3DCore/QTransform>
#include <Qt3DExtras/Qt3DExtras>
#include <Qt3DExtras/QPhongMaterial>
#include <Qt3DExtras/QCylinderMesh>
#include <Qt3DExtras/QSphereMesh>
#include <Qt3DRender/QCamera>
#include <Qt3DRender/QPointLight>
#include <Qt3DRender/QRenderAspect>
#include <Qt3DRender/QViewport>
#include <Qt3DRender/QClearBuffers>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    // 创建3D视图
    Qt3DExtras::Qt3DWindow view;
    view.defaultFrameGraph()->setClearColor(Qt::white);

    // 创建实体
    Qt3DCore::QEntity *rootEntity = new Qt3DCore::QEntity;

    // 创建坐标轴
    Qt3DExtras::QCylinderMesh *xAxis = new Qt3DExtras::QCylinderMesh;
    xAxis->setRadius(0.01f);
    xAxis->setLength(1.0f);
    xAxis->setSlices(100);
    xAxis->setRings(20);

    Qt3DExtras::QCylinderMesh *yAxis = new Qt3DExtras::QCylinderMesh;
    yAxis->setRadius(0.01f);
    yAxis->setLength(1.0f);
    yAxis->setSlices(100);
    yAxis->setRings(20);

    Qt3DExtras::QCylinderMesh *zAxis = new Qt3DExtras::QCylinderMesh;
    zAxis->setRadius(0.01f);
    zAxis->setLength(1.0f);
    zAxis->setSlices(100);
    zAxis->setRings(20);

    // 创建材质
    Qt3DExtras::QPhongMaterial *material = new Qt3DExtras::QPhongMaterial;
    material->setDiffuse(Qt::blue);

    // 创建实体组件
    Qt3DCore::QTransform *xAxisTransform = new Qt3DCore::QTransform;
    xAxisTransform->setTranslation(QVector3D(0.5f, 0.0f, 0.0f));

    Qt3DCore::QTransform *yAxisTransform = new Qt3DCore::QTransform;
    yAxisTransform->setRotation(QQuaternion::fromAxisAndAngle(QVector3D(0, 0, 1), 90));

    Qt3DCore::QTransform *zAxisTransform = new Qt3DCore::QTransform;
    zAxisTransform->setRotation(QQuaternion::fromAxisAndAngle(QVector3D(0, 1, 0), 90));

    // 添加实体组件到实体
    Qt3DCore::QEntity *xAxisEntity = new Qt3DCore::QEntity(rootEntity);
    xAxisEntity->addComponent(xAxis);
    xAxisEntity->addComponent(material);
    xAxisEntity->addComponent(xAxisTransform);

    Qt3DCore::QEntity *yAxisEntity = new Qt3DCore::QEntity(rootEntity);
    yAxisEntity->addComponent(yAxis);
    yAxisEntity->addComponent(material);
    yAxisEntity->addComponent(yAxisTransform);

    Qt3DCore::QEntity *zAxisEntity = new Qt3DCore::QEntity(rootEntity);
    zAxisEntity->addComponent(zAxis);
    zAxisEntity->addComponent(material);
    zAxisEntity->addComponent(zAxisTransform);

    // 设置相机
    Qt3DRender::QCamera *camera = view.camera();
    camera->lens()->setPerspectiveProjection(45.0f, 16.0f/9.0f, 0.1f, 1000.0f);
    camera->setPosition(QVector3D(2.0f, 2.0f, 2.0f));
    camera->setViewCenter(QVector3D(0, 0, 0));

    // 创建光源
    Qt3DRender::QPointLight *light = new Qt3DRender::QPointLight(rootEntity);
    light->setColor(Qt::white);
    light->setIntensity(1);

    // 设置视图
    view.setRootEntity(rootEntity);
    view.show();

    return app.exec();
}

此示例使用Qt的3D模块创建了一个简单的三维坐标图，包括X、Y、Z轴和一个光源。您可以根据需要修改和扩展此示例，以满足您的具体需求。