PIE-SDK For C ++ map mouse event listeners

1. Introduction

Map mouse events include mouse press MouseButtonPress (), bounce MouseButtonRelease (), moving MouseMove () events such operations can be dynamically map by these events, the status bar next to the map information specific example explains how to use these three events.

2. Functional Implementation Notes

2.1. The realization of ideas and Rationale

The first step: in the main event-capture header file

protected:

/**

* @Brief rewrite eventFilter event

* @Param [in] QObject * obj the object that triggered the event

* @Param [in] QEvent * ev event triggered

* @return

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

Step Two: In the .cpp be achieved write code file

2.2 core interfaces and methods

Interface / class	Methods / Properties	Explanation
SysDisplay::DisplayTransformationPtr	ToMapPoint	Screen coordinates to map coordinates
SysGeometry::SpatialReferencePtr	Name	Gets or sets the spatial reference Name

2.3. Sample Code

Project Path	Under Baidu cloud disk address / PIE sample program / 02. Map operation / 06. Map Mouse Event Listener
Data Path	The disc address Baidu cloud / the PIE exemplary data / raster data /04.World/World.tif
Video Path	Under Baidu cloud disk address / PIE video tutorials / 02. Map operation / 06. Map Mouse Event Listener .avi
Sample Code
Add an event to capture the header file protected: /** * @Brief rewrite eventFilter event * @Param [in] QObject * obj the object that triggered the event * @Param [in] QEvent * ev event triggered * @return / bool eventFilter(QObject obj, QEvent ev) override; Event coding // This example is mainly to map the status bar 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); }