PIE-SDK For C++地图鼠标事件监听

1.功能简介

地图鼠标事件包含鼠标的按下MouseButtonPress(),弹起MouseButtonRelease(),移动MouseMove()等事件，通过这些事件可以对地图进行动态的操作，接下来以地图状态栏的信息为例具体介绍如何使用这三种事件。

2.功能实现说明

2.1. 实现思路及原理说明

第一步：在主程序头文件中进行事件捕捉

protected:

    /**

    * @brief 重写eventFilter事件

    * @param[in] QObject *obj 触发事件的对象

    * @param[in] QEvent *ev 触发的事件

    * @return

    */

    bool eventFilter(QObject *obj, QEvent *ev) override;

第二步：在.cpp文件中进行实现代码编写

2.2. 核心接口与方法

接口/类	方法/属性	说明
SysDisplay::DisplayTransformationPtr	ToMapPoint	屏幕坐标转换为地图坐标
SysGeometry::SpatialReferencePtr	Name	设置或获取空间参考Name

2.3. 示例代码

项目路径	百度云盘地址下/PIE示例程序/02.地图操作/06.地图鼠标事件监听
数据路径	百度云盘地址下/PIE示例数据/栅格数据/04.World/World.tif
视频路径	百度云盘地址下/PIE视频教程/02.地图操作/06.地图鼠标事件监听.avi
示例代码
头文件中添加事件捕捉 protected:       /**     * @brief 重写eventFilter事件     * @param[in] QObject *obj 触发事件的对象     * @param[in] QEvent *ev 触发的事件     * @return     */     bool eventFilter(QObject *obj, QEvent *ev) override;   事件代码编写 //本次示例主要以地图的状态栏 bool PIEMainWindow::eventFilter(QObject *obj, QEvent *ev) {     if (obj == m_pMapControl)     {         if (ev->type() == QEvent::MouseMove)         {             QMouseEvent *pMouseEvent = static_cast<QMouseEvent*>(ev);             m_pLineEdit_ScreenCoordsInfos->setText(QString("%1,%2").arg(pMouseEvent->x()).arg(pMouseEvent->y()));             double mapX, mapY;             mapX = mapY = 0;             m_pMapControl->GetActiveView()->GetDisplayTransformation()->ToMapPoint(pMouseEvent->x(), pMouseEvent->y(), mapX, mapY);             m_pLineEdit_GeoCoordsInfos->setText(QString("%1,%2").arg(mapX).arg(mapY));               SysGeometry::SpatialReferencePtr ptrSR = m_pMapControl->GetMap()->GetSpatialReference();             if (ptrSR == nullptr) return true;             m_pLabel_SpatialReferenceInfos->setText(ptrSR->GetName());         }         else if (ev->type()==QEvent::MouseButtonPress)         {                 QMouseEvent *pMouseEvent = static_cast<QMouseEvent*>(ev);             QPoint qPoint;             qPoint.setX(pMouseEvent->x());             qPoint.setY(pMouseEvent->y());             SysGeometry::PointPtr point = new SysGeometry::Point();             point = m_pMapControl->GetActiveView()->GetDisplayTransformation()->ToMapPoint(qPoint);             QString screenPoint = QString("屏幕坐标：%1,%2").arg(pMouseEvent->x()).arg(pMouseEvent->y());             QString mapPoint= QString("屏幕坐标：%1,%2").arg(point->GetX()).arg(point->GetY());         }         else if (ev->type()==QEvent::MouseButtonRelease)         {             qDebug("鼠标释放事件");         }     }     else if (obj == m_pPageLayoutControl)     {         if (ev->type() == QEvent::MouseMove)         {             QMouseEvent *pMouseEvent = static_cast<QMouseEvent*>(ev);               m_pLineEdit_ScreenCoordsInfos->setText(QString("%1,%2").arg(pMouseEvent->x()).arg(pMouseEvent->y()));             double mapX, mapY;             mapX = mapY = 0;             m_pPageLayoutControl->GetActiveView()->GetDisplayTransformation()->ToMapPoint(pMouseEvent->x(), pMouseEvent->y(), mapX, mapY);             m_pLineEdit_GeoCoordsInfos->setText(QString("%1,%2").arg(mapX).arg(mapY));               SysGeometry::SpatialReferencePtr ptrSR = m_pPageLayoutControl->GetMap()->GetSpatialReference();             if (ptrSR == nullptr) return true;             m_pLabel_SpatialReferenceInfos->setText(ptrSR->GetName());         }     }     return QMainWindow::eventFilter(obj, ev); }

2.4. 示例截图