File indexing completed on 2024-05-12 15:54:11

 /*
  * Copyright (C) 2001-2015 Klaralvdalens Datakonsult AB.  All rights reserved.
  *
  * This file is part of the KD Chart library.
  *
  * 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.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
 #ifndef KCHARTABSTRACTCOORDINATEPLANE_H
 #define KCHARTABSTRACTCOORDINATEPLANE_H
 
 #include <QObject>
 #include <QList>
 
 #include "KChartAbstractArea.h"
 #include "KChartAbstractDiagram.h"
 #include "KChartEnums.h"
 
 namespace KChart {
 
     class Chart;
     class GridAttributes;
     class DataDimension;
 
     typedef QList<DataDimension> DataDimensionsList;
 
     /**
       * @brief Base class common for all coordinate planes, CartesianCoordinatePlane, PolarCoordinatePlane, TernaryCoordinatePlane
       */
     class KCHART_EXPORT AbstractCoordinatePlane : public AbstractArea
     {
         Q_OBJECT
 
         KCHART_DECLARE_PRIVATE_DERIVED_PARENT( AbstractCoordinatePlane, Chart* )
 
     friend class AbstractGrid;
 
     public:
         enum AxesCalcMode { Linear, Logarithmic };
 
     protected:
         explicit AbstractCoordinatePlane( Chart* parent = nullptr );
 
     public:
         virtual ~AbstractCoordinatePlane();
 
         /**
          * Adds a diagram to this coordinate plane.
          * @param diagram The diagram to add.
          *
          * \sa replaceDiagram, takeDiagram
          */
         virtual void addDiagram( AbstractDiagram* diagram );
 
         /**
          * Replaces the old diagram, or appends the
          * diagram, it there is none yet.
          *
          * @param diagram The diagram to be used instead of the old diagram.
          * This parameter must not be zero, or the method will do nothing.
          *
          * @param oldDiagram The diagram to be removed by the new diagram. This
          * diagram will be deleted automatically. If the parameter is omitted,
          * the very first diagram will be replaced. In case, there was no
          * diagram yet, the new diagram will just be added.
          *
          * \note If you want to re-use the old diagram, call takeDiagram and
          * addDiagram, instead of using replaceDiagram.
          *
          * \sa addDiagram, takeDiagram
          */
         virtual void replaceDiagram( AbstractDiagram* diagram, AbstractDiagram* oldDiagram = nullptr );
 
         /**
          * Removes the diagram from the plane, without deleting it.
          *
          * The plane no longer owns the diagram, so it is
          * the caller's responsibility to delete the diagram.
          *
          * \sa addDiagram, replaceDiagram
         */
         virtual void takeDiagram( AbstractDiagram* diagram );
 
         /**
          * @return The first diagram associated with this coordinate plane.
          */
         AbstractDiagram* diagram();
 
         /**
          * @return The list of diagrams associated with this coordinate plane.
          */
         AbstractDiagramList diagrams();
 
         /**
          * @return The list of diagrams associated with this coordinate plane.
          */
         ConstAbstractDiagramList diagrams() const;
 
         /**
          * Distribute the available space among the diagrams and axes.
          */
         virtual void layoutDiagrams() = 0;
 
         /**
          * Translate the given point in value space coordinates to a position
          * in pixel space.
          * @param diagramPoint The point in value coordinates.
          * @returns The translated point.
          */
         virtual const QPointF translate( const QPointF& diagramPoint ) const = 0;
 
         /**
          * @return Whether zooming with a rubber band using the mouse is enabled.
          */
         bool isRubberBandZoomingEnabled() const;
 
         /**
          * Enables or disables zooming with a rubber band using the mouse.
          */
         void setRubberBandZoomingEnabled( bool enable );
 
         /**
          * @return The zoom factor in horizontal direction, that is applied
          * to all coordinate transformations.
          */
         virtual qreal zoomFactorX() const { return 1.0; }
 
         /**
          * @return The zoom factor in vertical direction, that is applied
          * to all coordinate transformations.
          */
         virtual qreal zoomFactorY() const { return 1.0; }
 
         /**
          * Sets both zoom factors in one go.
          * \sa setZoomFactorX,setZoomFactorY
          */
         virtual void setZoomFactors( qreal factorX, qreal factorY ) { Q_UNUSED( factorX ); Q_UNUSED( factorY ); }
 
         /**
          * Sets the zoom factor in horizontal direction, that is applied
          * to all coordinate transformations.
          * @param factor The new zoom factor
          */
         virtual void setZoomFactorX( qreal  factor ) { Q_UNUSED( factor ); }
 
         /**
          * Sets the zoom factor in vertical direction, that is applied
          * to all coordinate transformations.
          * @param factor The new zoom factor
          */
         virtual void setZoomFactorY( qreal factor ) { Q_UNUSED( factor ); }
 
         /**
          * @return The center point (in value coordinates) of the
          * coordinate plane, that is used for zoom operations.
          */
         virtual QPointF zoomCenter() const { return QPointF(0.0, 0.0); }
 
         /**
          * Set the point (in value coordinates) to be used as the
          * center point in zoom operations.
          * @param center The point to use.
          */
         virtual void setZoomCenter( const QPointF& center ) { Q_UNUSED( center ); }
 
         /**
          * Set the grid attributes to be used by this coordinate plane.
          * To disable grid painting, for example, your code should like this:
          * \code
          * GridAttributes ga = plane->globalGridAttributes();
          * ga.setGlobalGridVisible( false );
          * plane->setGlobalGridAttributes( ga );
          * \endcode
          * \sa globalGridAttributes
          * \sa CartesianCoordinatePlane::setGridAttributes
          */
         void setGlobalGridAttributes( const GridAttributes & );
 
         /**
          * @return The grid attributes used by this coordinate plane.
          * \sa setGlobalGridAttributes
          * \sa CartesianCoordinatePlane::gridAttributes
          */
         GridAttributes globalGridAttributes() const;
 
         /**
          * Returns the dimensions used for drawing the grid lines.
          *
          * Returned data is the result of (cached) grid calculations,
          * so - if you need that information for your own tasks - make sure to
          * call again this function after every data modification that has changed
          * the data range, since grid calculation is based upon the data range,
          * thus the grid start/end might have changed if the data was changed.
          *
          * @note Returned list will contain different numbers of DataDimension,
          * depending on the kind of coordinate plane used.
          * For CartesianCoordinatePlane two DataDimension are returned: the first
          * representing grid lines in X direction (matching the Abscissa axes)
          * and the second indicating vertical grid lines (or Ordinate axes, resp.).
          *
          * @return The dimensions used for drawing the grid lines.
          * @sa DataDimension
          */
         DataDimensionsList gridDimensionsList();
 
         /**
          * Set another coordinate plane to be used as the reference plane
          * for this one.
          * @param plane The coordinate plane to be used the reference plane
          * for this one.
          * @see referenceCoordinatePlane
          */
         void setReferenceCoordinatePlane( AbstractCoordinatePlane * plane );
 
         /**
          * There are two ways, in which planes can be caused to interact, in
          * where they are put layouting wise: The first is the reference plane. If
          * such a reference plane is set, on a plane, it will use the same cell in the
          * layout as that one. In addition to this, planes can share an axis. In that case
          * they will be laid out in relation to each other as suggested by the position
          * of the axis. If, for example Plane1 and Plane2 share an axis at position Left,
          * that will result in the layout: Axis Plane1 Plane 2, vertically. If Plane1
          * also happens to be Plane2's reference plane, both planes are drawn over each
          * other. The reference plane concept allows two planes to share the same space
          * even if neither has any axis, and in case there are shared axis, it is used
          * to decided, whether the planes should be painted on top of each other or
          * laid out vertically or horizontally next to each other.
          * @return The reference coordinate plane associated with this one.
          */
         AbstractCoordinatePlane * referenceCoordinatePlane() const;
 
         /**
          * @return Whether this plane should have spacers in the corners
          * formed by the presence of axes.
          */
         bool isCornerSpacersEnabled() const;
 
         /**
          * Enables or disables the use of spacers in the plane corners.
          */
         void setCornerSpacersEnabled( bool enable );
 
         virtual AbstractCoordinatePlane* sharedAxisMasterPlane( QPainter* p = nullptr ); // KChart 3: const method?
 
 
         /** pure virtual in QLayoutItem */
         bool isEmpty() const override;
         /** pure virtual in QLayoutItem */
         Qt::Orientations expandingDirections() const override;
         /** pure virtual in QLayoutItem */
         QSize maximumSize() const override;
         /** pure virtual in QLayoutItem */
         QSize minimumSize() const override;
         /** pure virtual in QLayoutItem */
         QSize sizeHint() const override;
         /** pure virtual in QLayoutItem
           *
           * \note Do not call this function directly, unless you know
           * exactly what you are doing.  Geometry management is done
           * by KChart's internal layouting measures.
           */
         void setGeometry( const QRect& r ) override;
         /** pure virtual in QLayoutItem */
         QRect geometry() const override;
 
         virtual void mousePressEvent( QMouseEvent* event );
         virtual void mouseDoubleClickEvent( QMouseEvent* event );
         virtual void mouseMoveEvent( QMouseEvent* event );
         virtual void mouseReleaseEvent( QMouseEvent* event );
 
         /**
           * Called internally by KChart::Chart
           */
         void setParent( Chart* parent );
         Chart* parent();
         const Chart* parent() const;
 
         /**
          * Tests, if a point is visible on the coordinate plane.
          *
          * \note Before calling this function the point must have been translated into coordinate plane space.
          */
 #if defined(Q_COMPILER_MANGLES_RETURN_TYPE)
         const bool isVisiblePoint( const QPointF& point ) const;
 #else
         bool isVisiblePoint( const QPointF& point ) const;
 #endif
 
     public Q_SLOTS:
         /**
           * Calling update() on the plane triggers the global KChart::Chart::update()
           */
         void update();
         /**
           * Calling relayout() on the plane triggers the global KChart::Chart::slotRelayout()
           */
         void relayout();
         /**
           * Calling layoutPlanes() on the plane triggers the global KChart::Chart::slotLayoutPlanes()
           */
         void layoutPlanes();
         /**
          * Used by the chart to clear the cached grid data.
          */
         void setGridNeedsRecalculate();
 
     Q_SIGNALS:
         /** Emitted when this coordinate plane is destroyed. */
         void destroyedCoordinatePlane( AbstractCoordinatePlane* );
 
         /** Emitted when plane needs to update its drawings. */
         void needUpdate();
 
         /** Emitted when plane needs to trigger the Chart's layouting. */
         void needRelayout();
 
         /** Emitted when plane needs to trigger the Chart's layouting of the coord. planes. */
         void needLayoutPlanes();
 
         /** Emitted upon change of a property of the Coordinate Plane or any of its components. */
         void propertiesChanged();
 
         void boundariesChanged();
 
         /** Emitted after the geometry of the Coordinate Plane has been changed.
          *  and control has returned to the event loop.
          *
          * Parameters are the old geometry, the new geometry.
         */
         void geometryChanged( QRect, QRect );
 
     private:
     Q_SIGNALS:
         // Emitted from inside the setGeometry()
         // This is connected via QueuedConnection to the geometryChanged() Signal
         // that users can connect to safely then.
         void internal_geometryChanged( QRect, QRect );
         /** Emitted upon change of the view coordinate system */
         void viewportCoordinateSystemChanged();
 
     protected:
         virtual DataDimensionsList getDataDimensionsList() const = 0;
 
         //KCHART_DECLARE_PRIVATE_DERIVED( AbstractCoordinatePlane )
     };
 
     /**
      * \brief Helper class for one dimension of data, e.g. for the rows in a data model,
      * or for the labels of an axis, or for the vertical lines in a grid.
      *
      * isCalculated specifies whether this dimension's values are calculated or counted.
      * (counted == "Item 1", "Item 2", "Item 3" ...)
      *
      * sequence is the GranularitySequence, as specified at for the respective
      * coordinate plane.
      *
      * Step width is an optional parameter, to be omitted (or set to Zero, resp.)
      * if the step width is unknown.
      *
      * The default c'tor just gets you counted values from 1..10, using step width 1,
      * used by the CartesianGrid, when showing an empty plane without any diagrams.
      */
     class DataDimension{
     public:
         DataDimension()
             : start( 1.0 )
             , end( 10.0 )
             , isCalculated( false )
             , calcMode( AbstractCoordinatePlane::Linear )
             , sequence( KChartEnums::GranularitySequence_10_20 )
             , stepWidth( 1.0 )
             , subStepWidth( 0.0 )
         {}
         DataDimension( qreal start_,
                        qreal end_,
                        bool isCalculated_,
                        AbstractCoordinatePlane::AxesCalcMode calcMode_,
                        KChartEnums::GranularitySequence sequence_,
                        qreal stepWidth_=0.0,
                        qreal subStepWidth_=0.0 )
             : start( start_ )
             , end( end_ )
             , isCalculated( isCalculated_ )
             , calcMode( calcMode_ )
             , sequence( sequence_ )
             , stepWidth( stepWidth_ )
             , subStepWidth( subStepWidth_ )
         {}
         /**
           * Returns the size of the distance,
           * equivalent to the width() (or height(), resp.) of a QRectF.
           *
           * Note that this value can be negative, e.g. indicating axis labels
           * going in reversed direction.
           */
         qreal distance() const
         {
             return end-start;
         }
 
         bool operator==( const DataDimension& r ) const
         {
             return
                 (start        == r.start) &&
                 (end          == r.end) &&
                 (sequence     == r.sequence) &&
                 (isCalculated == r.isCalculated) &&
                 (calcMode     == r.calcMode) &&
                 (stepWidth    == r.stepWidth) &&
                 (subStepWidth    == r.subStepWidth);
         }
 
         bool operator!=( const DataDimension& other ) const
         { return !operator==( other ); }
 
 
         qreal start;
         qreal end;
         bool  isCalculated;
         AbstractCoordinatePlane::AxesCalcMode calcMode;
         KChartEnums::GranularitySequence sequence;
         qreal stepWidth;
         qreal subStepWidth;
     };
 
 #if !defined(QT_NO_DEBUG_STREAM)
     QDebug operator<<( QDebug stream, const DataDimension& r );
 #endif
 
 }
 #endif