qgsannotation.h

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/***************************************************************************
                             qgsannotation.h
                             ---------------
    begin                : January 2017
    copyright            : (C) 2017 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 QGSANNOTATION_H
#define QGSANNOTATION_H

#include "qgis_core.h"
#include "qgis.h"
#include "qgspointxy.h"
#include "qgscoordinatereferencesystem.h"
#include "qgsrendercontext.h"
#include "qgssymbol.h"
#include "qgsmargins.h"
#include "qgsmaplayer.h"

class CORE_EXPORT QgsAnnotation : public QObject
{

#ifdef SIP_RUN
    SIP_CONVERT_TO_SUBCLASS_CODE
    if ( dynamic_cast< QgsTextAnnotation * >( sipCpp ) )
      sipType = sipType_QgsTextAnnotation;
    else if ( dynamic_cast< QgsSvgAnnotation * >( sipCpp ) )
      sipType = sipType_QgsSvgAnnotation;
    else if ( dynamic_cast< QgsHtmlAnnotation * >( sipCpp ) )
      sipType = sipType_QgsHtmlAnnotation;
    else
      sipType = NULL;
    SIP_END
#endif


    Q_OBJECT
    Q_PROPERTY( bool visible READ isVisible WRITE setVisible )
    Q_PROPERTY( bool hasFixedMapPosition READ hasFixedMapPosition WRITE setHasFixedMapPosition )
    Q_PROPERTY( QgsPointXY mapPosition READ mapPosition WRITE setMapPosition )
    Q_PROPERTY( QSizeF frameSize READ frameSize WRITE setFrameSize )

  public:

    QgsAnnotation( QObject *parent SIP_TRANSFERTHIS = nullptr );

    virtual QgsAnnotation *clone() const = 0 SIP_FACTORY;

    bool isVisible() const { return mVisible; }

    void setVisible( bool visible );

    bool hasFixedMapPosition() const { return mHasFixedMapPosition; }

    void setHasFixedMapPosition( bool fixed );

    QgsPointXY mapPosition() const { return mMapPosition; }

    void setMapPosition( const QgsPointXY &position );

    QgsCoordinateReferenceSystem mapPositionCrs() const { return mMapPositionCrs; }

    void setMapPositionCrs( const QgsCoordinateReferenceSystem &crs );

    QPointF relativePosition() const { return mRelativePosition; }

    void setRelativePosition( QPointF position );

    void setFrameOffsetFromReferencePoint( QPointF offset );

    QPointF frameOffsetFromReferencePoint() const { return mOffsetFromReferencePoint; }

    void setFrameSize( QSizeF size );

    QSizeF frameSize() const { return mFrameSize; }

    void setContentsMargin( const QgsMargins &margins );

    QgsMargins contentsMargin() const { return mContentsMargins; }

    void setFillSymbol( QgsFillSymbol *symbol SIP_TRANSFER );

    QgsFillSymbol *fillSymbol() const { return mFillSymbol.get(); }

    void render( QgsRenderContext &context ) const;

    virtual void writeXml( QDomElement &elem, QDomDocument &doc, const QgsReadWriteContext &context ) const = 0;

    virtual void readXml( const QDomElement &itemElem, const QgsReadWriteContext &context ) = 0;

    void setMarkerSymbol( QgsMarkerSymbol *symbol SIP_TRANSFER );

    QgsMarkerSymbol *markerSymbol() const { return mMarkerSymbol.get(); }

    QgsMapLayer *mapLayer() const { return mMapLayer.data(); }

    void setMapLayer( QgsMapLayer *layer );

    QgsFeature associatedFeature() const { return mFeature; }

    virtual void setAssociatedFeature( const QgsFeature &feature );

  signals:

    void appearanceChanged();

    void moved();

    void mapLayerChanged();

  protected:

    virtual void renderAnnotation( QgsRenderContext &context, QSizeF size ) const = 0;

    virtual QSizeF minimumFrameSize() const;

    void _writeXml( QDomElement &itemElem, QDomDocument &doc, const QgsReadWriteContext &context ) const;

    void _readXml( const QDomElement &annotationElem, const QgsReadWriteContext &context );

    void copyCommonProperties( QgsAnnotation *target ) const;

  private:

    void updateBalloon();

    QLineF segment( int index ) const;

    QPointF pointOnLineWithDistance( QPointF startPoint, QPointF directionPoint, double distance ) const;

    void drawFrame( QgsRenderContext &context ) const;

    void drawMarkerSymbol( QgsRenderContext &context ) const;

    bool mVisible = true;

    bool mHasFixedMapPosition = true;

    QgsPointXY mMapPosition;

    QgsCoordinateReferenceSystem mMapPositionCrs;

    QPointF mRelativePosition;

    QPointF mOffsetFromReferencePoint = QPointF( 50, -50 );

    QSizeF mFrameSize;

    std::unique_ptr<QgsMarkerSymbol> mMarkerSymbol;

    QgsMargins mContentsMargins;

    std::unique_ptr<QgsFillSymbol> mFillSymbol;

    int mBalloonSegment = -1;

    QPointF mBalloonSegmentPoint1;

    QPointF mBalloonSegmentPoint2;

    QgsWeakMapLayerPointer mMapLayer;

    QgsFeature mFeature;

};

#endif // QGSANNOTATION_H