qgsdiagramrenderer.h

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/***************************************************************************
    qgsdiagramrenderer.h
    ---------------------
    begin                : March 2011
    copyright            : (C) 2011 by Marco Hugentobler
    email                : marco dot hugentobler at sourcepole dot ch
 ***************************************************************************
 *                                                                         *
 *   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 QGSDIAGRAMRENDERER_H
#define QGSDIAGRAMRENDERER_H
 
#include "qgis_core.h"
#include "qgis_sip.h"
#include <QColor>
#include <QFont>
#include <QList>
#include <QPointF>
#include <QSizeF>
#include <QDomDocument>
 
#include "qgsexpressioncontext.h"
#include "qgsfields.h"
#include "qgscoordinatetransform.h"
#include "qgsproperty.h"
#include "qgspropertycollection.h"
 
#include "diagram/qgsdiagram.h"
#include "qgsreadwritecontext.h"
#include "qgsmapunitscale.h"
 
class QgsDiagramRenderer;
class QgsFeature;
class QgsRenderContext;
class QDomElement;
class QgsMapToPixel;
class QgsReadWriteContext;
class QgsVectorLayer;
class QgsLayerTreeModelLegendNode;
class QgsLayerTreeLayer;
class QgsPaintEffect;
class QgsDataDefinedSizeLegend;
class QgsLineSymbol;
 
namespace pal { class Layer; } SIP_SKIP
 
class CORE_EXPORT QgsDiagramLayerSettings
{
  public:
 
    //avoid inclusion of QgsPalLabeling
    enum Placement
    {
      AroundPoint = 0, // Point / Polygon
      OverPoint, // Point / Polygon
      Line, // Line / Polygon
      Curved, // Line
      Horizontal, // Polygon
      Free // Polygon
    };
 
    enum LinePlacementFlag
    {
      OnLine    = 1,
      AboveLine = 1 << 1,
      BelowLine = 1 << 2,
      MapOrientation = 1 << 4,
    };
    Q_DECLARE_FLAGS( LinePlacementFlags, LinePlacementFlag )
 
    
    enum Property
    {
      BackgroundColor, 
      StrokeColor, 
      StrokeWidth, 
      PositionX, 
      PositionY, 
      Distance, 
      Priority, 
      ZIndex, 
      IsObstacle, 
      Show, 
      AlwaysShow, 
      StartAngle, 
    };
 
    static const QgsPropertiesDefinition &propertyDefinitions();
 
    QgsDiagramLayerSettings();
 
    QgsDiagramLayerSettings( const QgsDiagramLayerSettings &rh );
 
    QgsDiagramLayerSettings &operator=( const QgsDiagramLayerSettings &rh );
 
    ~QgsDiagramLayerSettings();
 
    Placement placement() const { return mPlacement; }
 
    void setPlacement( Placement value ) { mPlacement = value; }
 
    LinePlacementFlags linePlacementFlags() const { return mPlacementFlags; }
 
    void setLinePlacementFlags( LinePlacementFlags flags ) { mPlacementFlags = flags; }
 
    int priority() const { return mPriority; }
 
    void setPriority( int value ) { mPriority = value; }
 
    double zIndex() const { return mZIndex; }
 
    void setZIndex( double index ) { mZIndex = index; }
 
    bool isObstacle() const { return mObstacle; }
 
    void setIsObstacle( bool isObstacle ) { mObstacle = isObstacle; }
 
    double distance() const { return mDistance; }
 
    void setDistance( double distance ) { mDistance = distance; }
 
    QgsDiagramRenderer *renderer() { return mRenderer; }
 
    const QgsDiagramRenderer *renderer() const { return mRenderer; } SIP_SKIP
 
    void setRenderer( QgsDiagramRenderer *diagramRenderer SIP_TRANSFER );
 
    QgsCoordinateTransform coordinateTransform() const { return mCt; }
 
    void setCoordinateTransform( const QgsCoordinateTransform &transform );
 
    bool showAllDiagrams() const { return mShowAll; }
 
    void setShowAllDiagrams( bool showAllDiagrams ) { mShowAll = showAllDiagrams; }
 
    void readXml( const QDomElement &elem );
 
    void writeXml( QDomElement &layerElem, QDomDocument &doc ) const;
 
    bool prepare( const QgsExpressionContext &context = QgsExpressionContext() ) const;
 
    QSet< QString > referencedFields( const QgsExpressionContext &context = QgsExpressionContext() ) const;
 
    QgsPropertyCollection &dataDefinedProperties() { return mDataDefinedProperties; }
 
    const QgsPropertyCollection &dataDefinedProperties() const { return mDataDefinedProperties; } SIP_SKIP
 
    void setDataDefinedProperties( const QgsPropertyCollection &collection ) { mDataDefinedProperties = collection; }
 
  private:
 
    QgsCoordinateTransform mCt;
 
    Placement mPlacement = AroundPoint;
 
    LinePlacementFlags mPlacementFlags = OnLine;
 
    int mPriority = 5;
 
    double mZIndex = 0.0;
 
    bool mObstacle = false;
 
    double mDistance = 0.0;
 
    QgsDiagramRenderer *mRenderer = nullptr;
 
    bool mShowAll = true;
 
    QgsPropertyCollection mDataDefinedProperties;
 
    static void initPropertyDefinitions();
 
    static QgsPropertiesDefinition sPropertyDefinitions;
 
};
 
class CORE_EXPORT QgsDiagramSettings
{
  public:
 
    enum LabelPlacementMethod
    {
      Height,
      XHeight
    };
 
    enum DiagramOrientation
    {
      Up,
      Down,
      Left,
      Right
    };
 
    enum Direction
    {
      Clockwise, 
      Counterclockwise, 
    };
 
    QgsDiagramSettings();
    ~QgsDiagramSettings();
 
    QgsDiagramSettings( const QgsDiagramSettings &other );
 
    QgsDiagramSettings &operator=( const QgsDiagramSettings &other );
 
    bool enabled = true;
    QFont font;
    QList< QColor > categoryColors;
    QList< QString > categoryAttributes;
    QList< QString > categoryLabels;
    QSizeF size; //size
 
    QgsUnitTypes::RenderUnit sizeType = QgsUnitTypes::RenderMillimeters;
 
    QgsMapUnitScale sizeScale;
 
    QgsUnitTypes::RenderUnit lineSizeUnit = QgsUnitTypes::RenderMillimeters;
 
    QgsMapUnitScale lineSizeScale;
 
    QColor backgroundColor;
    QColor penColor;
    double penWidth = 0.0;
    LabelPlacementMethod labelPlacementMethod = QgsDiagramSettings::Height;
    DiagramOrientation diagramOrientation = QgsDiagramSettings::Up;
    double barWidth = 5.0;
 
    double opacity = 1.0;
 
    bool scaleByArea = true;
 
    double rotationOffset = 270;
 
    bool scaleBasedVisibility = false;
 
    double maximumScale = 0;
 
    double minimumScale = 0;
 
    double minimumSize = 0.0;
 
    double spacing() const { return mSpacing; }
 
    void setSpacing( double spacing ) { mSpacing = spacing; }
 
    void setSpacingUnit( QgsUnitTypes::RenderUnit unit ) { mSpacingUnit = unit; }
 
    QgsUnitTypes::RenderUnit spacingUnit() const { return mSpacingUnit; }
 
    void setSpacingMapUnitScale( const QgsMapUnitScale &scale ) { mSpacingMapUnitScale = scale; }
 
    const QgsMapUnitScale &spacingMapUnitScale() const { return mSpacingMapUnitScale; }
 
    Direction direction() const;
 
    void setDirection( Direction direction );
 
    void readXml( const QDomElement &elem, const QgsReadWriteContext &context = QgsReadWriteContext() );
    void writeXml( QDomElement &rendererElem, QDomDocument &doc, const QgsReadWriteContext &context = QgsReadWriteContext() ) const;
 
    QList< QgsLayerTreeModelLegendNode * > legendItems( QgsLayerTreeLayer *nodeLayer ) const SIP_FACTORY;
 
    QgsLineSymbol *axisLineSymbol() const;
 
    void setAxisLineSymbol( QgsLineSymbol *symbol SIP_TRANSFER );
 
    bool showAxis() const;
 
    void setShowAxis( bool showAxis );
 
    QgsPaintEffect *paintEffect() const;
 
    void setPaintEffect( QgsPaintEffect *effect SIP_TRANSFER );
 
  private:
 
    double mSpacing = 0;
    QgsUnitTypes::RenderUnit mSpacingUnit = QgsUnitTypes::RenderMillimeters;
    QgsMapUnitScale mSpacingMapUnitScale;
    Direction mDirection = Counterclockwise;
 
    bool mShowAxis = false;
    std::unique_ptr< QgsLineSymbol > mAxisLineSymbol;
    std::unique_ptr< QgsPaintEffect > mPaintEffect;
 
};
 
class CORE_EXPORT QgsDiagramInterpolationSettings
{
  public:
    QSizeF lowerSize;
    QSizeF upperSize;
    double lowerValue;
    double upperValue;
 
    QString classificationField;
 
    QString classificationAttributeExpression;
    bool classificationAttributeIsExpression;
};
 
 
class CORE_EXPORT QgsDiagramRenderer
{
 
#ifdef SIP_RUN
    SIP_CONVERT_TO_SUBCLASS_CODE
    if ( sipCpp->rendererName() == QLatin1String( "SingleCategory" ) )
      sipType = sipType_QgsSingleCategoryDiagramRenderer;
    else if ( sipCpp->rendererName() == QLatin1String( "LinearlyInterpolated" ) )
      sipType = sipType_QgsLinearlyInterpolatedDiagramRenderer;
    else
      sipType = NULL;
    SIP_END
#endif
 
  public:
 
    QgsDiagramRenderer() = default;
    virtual ~QgsDiagramRenderer() = default;
 
    virtual QgsDiagramRenderer *clone() const = 0 SIP_FACTORY;
 
    virtual QSizeF sizeMapUnits( const QgsFeature &feature, const QgsRenderContext &c ) const;
 
    virtual QString rendererName() const = 0;
 
    virtual QList<QString> diagramAttributes() const = 0;
 
    virtual QSet< QString > referencedFields( const QgsExpressionContext &context = QgsExpressionContext() ) const;
 
    void renderDiagram( const QgsFeature &feature, QgsRenderContext &c, QPointF pos, const QgsPropertyCollection &properties = QgsPropertyCollection() ) const;
 
    void setDiagram( QgsDiagram *d SIP_TRANSFER );
    QgsDiagram *diagram() const { return mDiagram.get(); }
 
    virtual QList<QgsDiagramSettings> diagramSettings() const = 0;
 
    virtual void readXml( const QDomElement &elem, const QgsReadWriteContext &context ) = 0;
 
    virtual void writeXml( QDomElement &layerElem, QDomDocument &doc, const QgsReadWriteContext &context ) const = 0;
 
    virtual QList< QgsLayerTreeModelLegendNode * > legendItems( QgsLayerTreeLayer *nodeLayer ) const SIP_FACTORY;
 
    bool attributeLegend() const { return mShowAttributeLegend; }
 
    void setAttributeLegend( bool enabled ) { mShowAttributeLegend = enabled; }
 
  protected:
    QgsDiagramRenderer( const QgsDiagramRenderer &other );
    QgsDiagramRenderer &operator=( const QgsDiagramRenderer &other );
 
    virtual bool diagramSettings( const QgsFeature &feature, const QgsRenderContext &c, QgsDiagramSettings &s ) const = 0;
 
    virtual QSizeF diagramSize( const QgsFeature &features, const QgsRenderContext &c ) const = 0;
 
    void convertSizeToMapUnits( QSizeF &size, const QgsRenderContext &context ) const;
 
    static int dpiPaintDevice( const QPainter * );
 
    //read / write diagram
 
    void _readXml( const QDomElement &elem, const QgsReadWriteContext &context );
 
    void _writeXml( QDomElement &rendererElem, QDomDocument &doc, const QgsReadWriteContext &context ) const;
 
    std::unique_ptr< QgsDiagram > mDiagram;
 
    bool mShowAttributeLegend = true;
};
 
class CORE_EXPORT QgsSingleCategoryDiagramRenderer : public QgsDiagramRenderer
{
  public:
 
    QgsSingleCategoryDiagramRenderer() = default;
 
    QgsSingleCategoryDiagramRenderer *clone() const override SIP_FACTORY;
 
    QString rendererName() const override { return QStringLiteral( "SingleCategory" ); }
 
    QList<QString> diagramAttributes() const override { return mSettings.categoryAttributes; }
 
    void setDiagramSettings( const QgsDiagramSettings &s ) { mSettings = s; }
 
    QList<QgsDiagramSettings> diagramSettings() const override;
 
    void readXml( const QDomElement &elem, const QgsReadWriteContext &context ) override;
    void writeXml( QDomElement &layerElem, QDomDocument &doc, const QgsReadWriteContext &context ) const override;
 
    QList< QgsLayerTreeModelLegendNode * > legendItems( QgsLayerTreeLayer *nodeLayer ) const override SIP_FACTORY;
 
  protected:
    bool diagramSettings( const QgsFeature &feature, const QgsRenderContext &c, QgsDiagramSettings &s ) const override;
 
    QSizeF diagramSize( const QgsFeature &, const QgsRenderContext &c ) const override;
 
  private:
    QgsDiagramSettings mSettings;
};
 
class CORE_EXPORT QgsLinearlyInterpolatedDiagramRenderer : public QgsDiagramRenderer
{
  public:
    QgsLinearlyInterpolatedDiagramRenderer();
    ~QgsLinearlyInterpolatedDiagramRenderer() override;
 
    QgsLinearlyInterpolatedDiagramRenderer *clone() const override SIP_FACTORY;
 
    QList<QgsDiagramSettings> diagramSettings() const override;
 
    void setDiagramSettings( const QgsDiagramSettings &s ) { mSettings = s; }
 
    QList<QString> diagramAttributes() const override;
 
    QSet< QString > referencedFields( const QgsExpressionContext &context = QgsExpressionContext() ) const override;
 
    QString rendererName() const override { return QStringLiteral( "LinearlyInterpolated" ); }
 
    void setLowerValue( double val ) { mInterpolationSettings.lowerValue = val; }
    double lowerValue() const { return mInterpolationSettings.lowerValue; }
 
    void setUpperValue( double val ) { mInterpolationSettings.upperValue = val; }
    double upperValue() const { return mInterpolationSettings.upperValue; }
 
    void setLowerSize( QSizeF s ) { mInterpolationSettings.lowerSize = s; }
    QSizeF lowerSize() const { return mInterpolationSettings.lowerSize; }
 
    void setUpperSize( QSizeF s ) { mInterpolationSettings.upperSize = s; }
    QSizeF upperSize() const { return mInterpolationSettings.upperSize; }
 
    QString classificationField() const { return mInterpolationSettings.classificationField; }
 
    void setClassificationField( const QString &field ) { mInterpolationSettings.classificationField = field; }
 
    QString classificationAttributeExpression() const { return mInterpolationSettings.classificationAttributeExpression; }
    void setClassificationAttributeExpression( const QString &expression ) { mInterpolationSettings.classificationAttributeExpression = expression; }
 
    bool classificationAttributeIsExpression() const { return mInterpolationSettings.classificationAttributeIsExpression; }
    void setClassificationAttributeIsExpression( bool isExpression ) { mInterpolationSettings.classificationAttributeIsExpression = isExpression; }
 
    void readXml( const QDomElement &elem, const QgsReadWriteContext &context ) override;
    void writeXml( QDomElement &layerElem, QDomDocument &doc, const QgsReadWriteContext &context ) const override;
 
    QList< QgsLayerTreeModelLegendNode * > legendItems( QgsLayerTreeLayer *nodeLayer ) const override SIP_FACTORY;
 
    void setDataDefinedSizeLegend( QgsDataDefinedSizeLegend *settings SIP_TRANSFER );
 
    QgsDataDefinedSizeLegend *dataDefinedSizeLegend() const;
 
  protected:
    bool diagramSettings( const QgsFeature &feature, const QgsRenderContext &c, QgsDiagramSettings &s ) const override;
 
    QSizeF diagramSize( const QgsFeature &, const QgsRenderContext &c ) const override;
 
    QgsLinearlyInterpolatedDiagramRenderer( const QgsLinearlyInterpolatedDiagramRenderer &other );
 
  private:
    QgsDiagramSettings mSettings;
    QgsDiagramInterpolationSettings mInterpolationSettings;
 
    QgsDataDefinedSizeLegend *mDataDefinedSizeLegend = nullptr;
 
    QgsLinearlyInterpolatedDiagramRenderer &operator=( const QgsLinearlyInterpolatedDiagramRenderer & ) = delete;
};
 
#endif // QGSDIAGRAMRENDERER_H