191 lines
4.1 KiB
C++
191 lines
4.1 KiB
C++
#pragma once
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#include <QWheelEvent>
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#include <QPaintEvent>
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#include <QGraphicsView>
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#include <QGraphicsScene>
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#include <QTimer>
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#include <QEvent>
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#include <QKeyEvent>
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#include <QMouseEvent>
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#include <QResizeEvent>
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#include <QDragEnterEvent>
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#include <QRectF>
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#include <QMarginsF>
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#include <QHash>
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#include <crs.h>
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#include <pointxy.h>
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#include <mapcanvasmap.h>
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#include <maptool.h>
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namespace LAMPMainWidget {
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class MapLayer;
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class MapTool;
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/**
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* 地图容器类，继承自QGraphicsView。
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* 整个地图的渲染都是基于“Qt GraphicsView Framework”设计。
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*/
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class MapCanvas : public QGraphicsView {
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Q_OBJECT
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signals:
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void zoomChanged(int zoom);
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void crsChanged();
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void clicked(PointXY pos);
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void mapCenterChanged(PointXY pos);
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friend class MapToolPan;
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friend class MapToolZoomIn;
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friend class MapToolZoomOut;
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friend class MapToolSelect;
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public:
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explicit MapCanvas(QWidget* parent = nullptr);
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~MapCanvas() override;
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public:
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/**
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* 刷新地图容器，这会更新每一个显示的图层的内容
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*/
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void refreshMap();
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/**
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* 向容器中添加图层，默认情况下容器会使用首个图层的坐标系作为自身的坐标系
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* @param layer 图层对象
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*/
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void addLayer(MapLayer* layer);
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/**
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* 获取地图容器的比例尺
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* @return 容器的比例尺
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*/
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double scale() const;
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/**
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* 获取地图容器的解析度
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* @return
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*/
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double resolution() const;
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/**
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* 获取容器的zoom值
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* @return 容器的zoom值
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*/
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int zoomValue() const;
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/**
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* 设置容器的zoom值
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* @param zoom zoom值
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*/
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void setZoomValue(int zoom);
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/**
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* 获取容器当前所显示的地图区域
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* @return 当前所显示地图区域
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*/
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const QRectF& viewExtent() const { return mViewExtent; }
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/**
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* 设置容器坐标系，设置过后会更新所有图层坐标系。
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* 默认会对容器中的图层做投影变换处理
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* @param crs 坐标系
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*/
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void setCrs(const CRS* crs);
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/**
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* 获取地图容器的坐标系
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* @return 地图容器坐标系
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*/
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const CRS& crs() const { return *mCrs; }
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/**
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* 设置地图容器的当前选中图层
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* @param id 图层的id
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*/
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void setCurrentLayer(const QString& id);
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/**
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* 获取地图容器当前选中图层
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* @return 当前选中图层
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*/
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const MapLayer* currentLayer() { return mCurrentLayer; }
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/**
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* 获取地图当前视图中心点经纬度坐标
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* @return 视图中心点经纬度坐标
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*/
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const PointXY& mapCenter() const { return mMapCenter; }
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/**
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* 选择地图工具
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* @param tool 工具名称
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* @return 是否选择成功
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*/
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bool selectTool(const QString& tool);
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void timerEvent(QTimerEvent* event);
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protected:
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/**
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* 更新容器的可视化区域。
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* 每次拖动操作和resize事件会调用该方法
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*/
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void updateViewExtent(bool reset = false);
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/**
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* 将屏幕坐标转换为经纬度坐标
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* @param point 屏幕上点
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* @return 经纬度坐标
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*/
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PointXY pixel2Lonlat(const QPointF& point) const;
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/**
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* 初始设置地图必须具备的工具
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*/
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void setupTools();
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private:
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/**
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* 确保zoom值在限定的范围之内
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* @param zoom 待设置zoom值
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* @return 可使用zoom值
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*/
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int normalizeZoom(int zoom) const;
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protected:
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void mousePressEvent(QMouseEvent* event) override;
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void mouseReleaseEvent(QMouseEvent* event) override;
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void wheelEvent(QWheelEvent* event) override;
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void resizeEvent(QResizeEvent* event) override;
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void mouseMoveEvent(QMouseEvent* event) override;
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protected:
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QGraphicsScene* mScene; // 场景对象
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QRectF mMapExtent;
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QRectF mViewExtent;
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QRectF mDragRect;
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bool mIsDragging;
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QMap<QString, MapLayer*> mLayers;
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MapLayer* mCurrentLayer;
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const CRS* mCrs;
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PointXY mMapCenter;
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int mZoomValue;
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PointXY mLastXY;
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QTimer* mMapUpdateTimer;
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MapTool* mCurrentTool;
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QHash<QString, MapTool*> mMapTools;
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private:
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const static int kDefaultZoomValue{ 8 };
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static const int kMaxZoomValue{ 20 };
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static const int kMinZoomValue{ 1 };
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protected:
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// 设置默认地图中心点
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static PointXY defaultMapCenter();
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};
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}
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