静安区网站建设,北京网页制作教程,做网站卖高仿,网站设计项目策划ppt1.简介
QgsMapTool地图工具是用于操作地图画布的用户交互式工具。例如#xff0c;地图平移和缩放功能被实现为地图工具。
QgsMapTool是抽象基类#xff0c;以下是类的继承关系#xff1a; 2.常用接口
virtual void canvasDoubleClickEvent (QgsMapMouseEvent *e)重写鼠标…1.简介
QgsMapTool地图工具是用于操作地图画布的用户交互式工具。例如地图平移和缩放功能被实现为地图工具。
QgsMapTool是抽象基类以下是类的继承关系 2.常用接口
virtual void canvasDoubleClickEvent (QgsMapMouseEvent *e)重写鼠标双击事件virtual void canvasMoveEvent (QgsMapMouseEvent *e)重写鼠标移动事件virtual void canvasPressEvent (QgsMapMouseEvent *e)重写鼠标按下事件virtual void canvasReleaseEvent (QgsMapMouseEvent *e)重写鼠标抬起事件virtual void setCursor (const QCursor cursor)设置光标QgsPointXY toMapCoordinates (QPoint point)将点从屏幕坐标转换为地图坐标。
3.示例
示例1画布移动、放大、缩小 源码
#pragma once#include QtWidgets/QMainWindow
#include ui_GisCtrl.h
#include QDebug
#include QFileInfo
#include qgsmaptoolpan.h
#include qgsrasterlayer.h
#include qgsmapcanvas.h
#include qgspoint.h
#include QMouseEvent
#include qgsmaptoolzoom.h
#include QActionGroupclass GisCtrl : public QMainWindow
{Q_OBJECTpublic:GisCtrl(QWidget *parent Q_NULLPTR);private:Ui::GisCtrlClass ui;private slots:void slotXyCoordinates(const QgsPointXY p);void slotMove();void slotZoomIn();void slotZoomOut();private:QgsMapCanvas *m_mapCanvas nullptr;QListQgsMapLayer * m_layers;QgsMapToolPan *m_toolPan nullptr; // 新建移动工具QgsMapToolZoom *m_toolZoomIn nullptr;//放大QgsMapToolZoom *m_toolZoomOut nullptr;//缩小QActionGroup *m_actionGroup nullptr;
};#include GisCtrl.h
#include qgsrasterlayer.h
#include qgsrubberband.h
#pragma execution_character_set(utf-8)GisCtrl::GisCtrl(QWidget *parent): QMainWindow(parent)
{ui.setupUi(this);//创建画布m_mapCanvas new QgsMapCanvas(this);QString url F:/arcgis/TMS.xml;m_mapCanvas-setCanvasColor(QColor(255, 255, 255));//加载瓦片地图QgsRasterLayer *layer new QgsRasterLayer(url);if (!layer-isValid()){qDebug() load map faild;}m_layers.append(layer);// 新建移动工具m_toolPan new QgsMapToolPan(m_mapCanvas);m_mapCanvas-setExtent(layer-extent());m_mapCanvas-enableAntiAliasing(true);m_mapCanvas-setLayers(m_layers);m_mapCanvas-setMapTool(m_toolPan);m_toolZoomIn new QgsMapToolZoom(m_mapCanvas, false);m_toolZoomOut new QgsMapToolZoom(m_mapCanvas, true);m_actionGroup new QActionGroup(this);m_actionGroup-addAction(ui.actionMove);m_actionGroup-addAction(ui.actionZoomIn);m_actionGroup-addAction(ui.actionZoomOut);m_actionGroup-setExclusive(true);connect(m_mapCanvas, QgsMapCanvas::xyCoordinates, this, GisCtrl::slotXyCoordinates);connect(ui.actionMove, QAction::triggered, this, GisCtrl::slotMove);connect(ui.actionZoomIn, QAction::triggered, this, GisCtrl::slotZoomIn);connect(ui.actionZoomOut, QAction::triggered, this, GisCtrl::slotZoomOut);setCentralWidget(m_mapCanvas);ui.actionMove-setChecked(true);ui.actionLineManager-setVisible(false);ui.actionLayer-setVisible(false);ui.actionSelect-setVisible(false);ui.actionItem-setVisible(false);
}void GisCtrl::slotXyCoordinates(const QgsPointXY p)
{QString str QString(经度 %1纬度%2).arg(QString::number(p.x(), f, 6)).arg(QString::number(p.y(), f, 6));this-statusBar()-showMessage(str);
}void GisCtrl::slotMove()
{m_mapCanvas-setMapTool(m_toolPan);
}void GisCtrl::slotZoomIn()
{m_mapCanvas-setMapTool(m_toolZoomIn);
}void GisCtrl::slotZoomOut()
{m_mapCanvas-setMapTool(m_toolZoomOut);
}示例2鼠标点击画矩形 源码
自定义一个地图交互工具继承QgsMapToolIdentify
#pragma once
#include QObject
#include QList
#include QScopedPointer
#include qgsmapcanvas.h
#include qgsmaptoolidentify.h
#include qgsrubberband.h
#include qgsmapmouseevent.hclass QgsMapToolSelectFeatures : public QgsMapToolIdentify
{Q_OBJECT
public:QgsMapToolSelectFeatures(QgsMapCanvas *mapCanvas);protected://重写鼠标移动void canvasMoveEvent(QgsMapMouseEvent *e) override;//重写鼠标按下void canvasPressEvent(QgsMapMouseEvent *e) override;void initRubberBand();private:// 是否正在选择bool mSelectionActive false;QScopedPointerQgsRubberBand mSelectionRubberBand;QColor mFillColor QColor(255, 255, 0, 63);QColor mStrokeColor QColor(255, 255, 0, 100);QPoint mInitDragPos;
};//cpp
#include QgsMapToolSelectFeatures.h
#include QgsMapToolIdentify.hQgsMapToolSelectFeatures::QgsMapToolSelectFeatures(QgsMapCanvas *mapCanvas): QgsMapToolIdentify(mapCanvas)
{
}void QgsMapToolSelectFeatures::canvasMoveEvent(QgsMapMouseEvent * e)
{if (e-buttons() ! Qt::LeftButton)return;QRect rect;if (!mSelectionActive){mSelectionActive true;rect QRect(e-pos(), e-pos());}else{rect QRect(e-pos(), mInitDragPos);}if (mSelectionRubberBand)mSelectionRubberBand-setToCanvasRectangle(rect);
}void QgsMapToolSelectFeatures::canvasPressEvent(QgsMapMouseEvent * e)
{if (!mSelectionRubberBand)initRubberBand();mInitDragPos e-pos();
}void QgsMapToolSelectFeatures::initRubberBand()
{mSelectionRubberBand.reset(new QgsRubberBand(mCanvas, QgsWkbTypes::PolygonGeometry));mSelectionRubberBand-setFillColor(mFillColor);mSelectionRubberBand-setStrokeColor(mStrokeColor);
}
使用
QgsMapToolSelectFeatures *m_tool new QgsMapToolSelectFeatures(m_mapCanvas);
m_mapCanvas-setMapTool(m_tool);
