qgselevationprofilecanvas.h

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/***************************************************************************
                          qgselevationprofilecanvas.h
                          ---------------
    begin                : March 2022
    copyright            : (C) 2022 by Nyall Dawson
    email                : nyall dot dawson at gmail dot com
***************************************************************************/
 
/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
 
#ifndef QGSELEVATIONPROFILECANVAS_H
#define QGSELEVATIONPROFILECANVAS_H
 
#include "qgsconfig.h"
#include "qgis_sip.h"
#include "qgis_gui.h"
#include "qgsplotcanvas.h"
#include "qgsmaplayer.h"
#include "qgscoordinatereferencesystem.h"
#include "qgsprofilepoint.h"
 
class QgsElevationProfilePlotItem;
class QgsElevationProfileCrossHairsItem;
class QgsAbstractProfileResults;
class QgsProfilePlotRenderer;
class QgsCurve;
class Qgs2DPlot;
class QgsProfileSnapContext;
class QgsProfileIdentifyContext;
class QgsProfileIdentifyResults;
class QgsScreenHelper;
 
class GUI_EXPORT QgsElevationProfileCanvas : public QgsPlotCanvas
{
 
    Q_OBJECT
 
  public:
 
    QgsElevationProfileCanvas( QWidget *parent SIP_TRANSFERTHIS = nullptr );
 
    ~QgsElevationProfileCanvas() override;
    QgsCoordinateReferenceSystem crs() const override;
    QgsPoint toMapCoordinates( const QgsPointXY &point ) const override;
    QgsPointXY toCanvasCoordinates( const QgsPoint &point ) const override;
    void resizeEvent( QResizeEvent *event ) override;
    void paintEvent( QPaintEvent *event ) override;
    void cancelJobs() override SIP_SKIP;
    void panContentsBy( double dx, double dy ) override;
    void centerPlotOn( double x, double y ) override;
    void scalePlot( double factor ) override;
    QgsPointXY snapToPlot( QPoint point ) override;
 
    void scalePlot( double xFactor, double yFactor );
 
    void zoomToRect( const QRectF &rect ) override;
    void wheelZoom( QWheelEvent *event ) override;
    void mouseMoveEvent( QMouseEvent *e ) override;
 
    QRectF plotArea() const;
 
    void refresh() override;
 
    void invalidateCurrentPlotExtent();
 
    void setProject( QgsProject *project );
 
    void setLayers( const QList< QgsMapLayer * > &layers );
 
    QList< QgsMapLayer * > layers() const;
 
    void setCrs( const QgsCoordinateReferenceSystem &crs );
 
    void setProfileCurve( QgsCurve *curve SIP_TRANSFER );
 
    QgsCurve *profileCurve() const;
 
    void setTolerance( double tolerance );
 
    double tolerance() const { return mTolerance; }
 
    void setVisiblePlotRange( double minimumDistance, double maximumDistance, double minimumElevation, double maximumElevation );
 
    QgsDoubleRange visibleDistanceRange() const;
 
    QgsDoubleRange visibleElevationRange() const;
 
    const Qgs2DPlot &plot() const SIP_SKIP;
 
    void render( QgsRenderContext &context, double width, double height, const Qgs2DPlot &plotSettings );
 
    QVector<QgsProfileIdentifyResults> identify( QPointF point );
 
    QVector<QgsProfileIdentifyResults> identify( const QRectF &rect );
 
    QgsProfilePoint canvasPointToPlotPoint( QPointF point ) const;
 
    QgsPointXY plotPointToCanvasPoint( const QgsProfilePoint &point ) const;
 
  signals:
 
    void activeJobCountChanged( int count );
 
    void canvasPointHovered( const QgsPointXY &point, const QgsProfilePoint &profilePoint );
 
  public slots:
 
    void zoomFull();
 
    void clear();
 
    void setSnappingEnabled( bool enabled );
 
  private slots:
 
    void generationFinished();
    void onLayerProfileGenerationPropertyChanged();
    void onLayerProfileRendererPropertyChanged();
    void regenerateResultsForLayer();
    void scheduleDeferredRegeneration();
    void scheduleDeferredRedraw();
    void startDeferredRegeneration();
    void startDeferredRedraw();
    void refineResults();
 
  private:
 
    QgsProfileSnapContext snapContext() const;
    QgsProfileIdentifyContext identifyContext() const;
 
    void setupLayerConnections( QgsMapLayer *layer, bool isDisconnect );
 
    QgsScreenHelper *mScreenHelper = nullptr;
 
    QgsCoordinateReferenceSystem mCrs;
    QgsProject *mProject = nullptr;
 
    QgsWeakMapLayerPointerList mLayers;
 
    QgsElevationProfilePlotItem *mPlotItem = nullptr;
    QgsElevationProfileCrossHairsItem *mCrossHairsItem = nullptr;
 
    QgsProfilePlotRenderer *mCurrentJob = nullptr;
    QTimer *mDeferredRegenerationTimer = nullptr;
    bool mDeferredRegenerationScheduled = false;
    QTimer *mDeferredRedrawTimer = nullptr;
    bool mDeferredRedrawScheduled = false;
 
    std::unique_ptr< QgsCurve > mProfileCurve;
    double mTolerance = 0;
 
    bool mFirstDrawOccurred = false;
 
    bool mSnappingEnabled = true;
 
    bool mZoomFullWhenJobFinished = true;
 
    bool mForceRegenerationAfterCurrentJobCompletes = false;
 
    static constexpr double MAX_ERROR_PIXELS = 2;
};
 
#endif // QGSELEVATIONPROFILECANVAS_H