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/**********************************************************************
  PlotObject -- Part of the Avogadro 2D plotting interface

  Copyright (C) 2003 Jason Harris <kstars@30doradus.org> (KDE)
  Copyright (C) 2008 David Lonie <loniedavid@gmail.com> (Avogadro)

  This file is part of the Avogadro molecular editor project.
  For more information, see <http://avogadro.openmolecules.net/>

  This file is based on KPlotWidget from the KDE library. For more
  information see <http://www.kde.org/>

  Avogadro 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.

  Avogadro 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, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  02110-1301, USA.
 **********************************************************************/

#ifndef PLOTOBJECT_H
#define PLOTOBJECT_H

#include <QtCore/QString>
#include <QtGui/QColor>

#include <avogadro/global.h>

class QBrush;
class QPainter;
class QPen;
class QPointF;
class QRect;
class QRectF;

namespace Avogadro {

class PlotWidget;
class PlotPoint;

  /**
   * @class PlotObject plotobject.h <avogadro/plotobject.h>
   * @short Encapsulates a data set to be plotted in a PlotWidget.
   *
   * Think of a PlotObject as a set of data displayed as a group in the plot.
   * Each PlotObject consists of a list of PlotPoints, a "type" controlling
   * how the data points are displayed (some combination of Points, Lines, or
   * Bars), a color, and a size. There is also a parameter which controls the
   * shape of the points used to display the PlotObject.
   *
   * @note PlotObject will take care of the points added to it, so when clearing
   * the points list (eg with clearPoints()) any previous reference to a PlotPoint
   * already added to a PlotObject will be invalid.
   *
   * @author Jason Harris
   * @version 1.1
   */
  class A_EXPORT PlotObject{
  public:
    /**
     * The type classification of the PlotObject.
     *
     * These are bitmask values that can be OR'd together, so that a set
     * of points can be represented in the plot in multiple ways.
     *
     * @note points should be added in order of increasing x-coordinate
     * when using Bars.
     */
    enum PlotType
      {
        UnknownType = 0,
        Points = 1,       ///< each PlotPoint is represented with a drawn point
        Lines = 2,        ///< each PlotPoint is connected with a line
        Bars = 4          ///< each PlotPoint is shown as a vertical bar
      };
    Q_DECLARE_FLAGS( PlotTypes, PlotType )

    /**
     * The available shape styles for plotted points.
     */
    enum PointStyle
    {
      NoPoints = 0,
      Circle = 1,
      Letter = 2,
      Triangle = 3,
      Square = 4,
      Pentagon = 5,
      Hexagon = 6,
      Asterisk = 7,
      Star = 8,
      UnknownPoint
    };

    /**
     * Constructor.
     * @param color The color for plotting this object. By default this sets
     * the color for Points, Lines and Bars, but there are functions to
     * override any of these.
     * @param otype the PlotType for this object (Points, Lines or Bars)
     * @param size the size to use for plotted points, in pixels
     * @param ps The PointStyle describing the shape for plotted points
     */
    explicit PlotObject( const QColor &color = Qt::white, PlotType otype = Points, double size = 2, PointStyle ps = Circle );

    /**
     * Destructor.
     */
    ~PlotObject();

    /**
     * @return the plot flags of the object
     */
    PlotTypes plotTypes() const;

    /**
     * Set whether points will be drawn for this object
     * @param b if true, points will be drawn
     */
    void setShowPoints( bool b );

    /**
     * Set whether lines will be drawn for this object
     * @param b if true, lines will be drawn
     */
    void setShowLines( bool b );

    /**
     * Set whether bars will be drawn for this object
     * @param b if true, bars will be drawn
     */
    void setShowBars( bool b );

    /**
     * @return the size of the plotted points in this object, in pixels
     */
    double size() const;

    /**
     * Set the size for plotted points in this object, in pixels
     * @param s the new size
     */
    void setSize( double s );

    /**
     * @return the style used for drawing the points in this object
     */
    PointStyle pointStyle() const;

    /**
     * Set a new style for drawing the points in this object
     * @param p the new style
     */
    void setPointStyle( PointStyle p );

    /**
     * @return the default pen for this Object.
     * If no other pens are set, this pen will be used for
     * points, lines, bars and labels (this pen is always used for points).
     */
    const QPen& pen() const;

    /**
     * Set the default pen for this object
     * @p The pen to use
     */
    void setPen( const QPen &p );

    /**
     * @return the pen to use for drawing lines for this Object.
     */
    const QPen& linePen() const;

    /**
     * Set the pen to use for drawing lines for this object
     * @p The pen to use
     */
    void setLinePen( const QPen &p );

    /**
     * @return the pen to use for drawing bars for this Object.
     */
    const QPen& barPen() const;

    /**
     * Set the pen to use for drawing bars for this object
     * @p The pen to use
     */
    void setBarPen( const QPen &p );

    /**
     * @return the pen to use for drawing labels for this Object.
     */
    const QPen& labelPen() const;

    /**
     * Set the pen to use for labels for this object
     * @p The pen to use
     */
    void setLabelPen( const QPen &p );

    /**
     * @return the default Brush to use for this Object.
     */
    const QBrush brush() const;

    /**
     * Set the default brush to use for this object
     * @b The brush to use
     */
    void setBrush( const QBrush &b );

    /**
     * @return the brush to use for filling bars for this Object.
     */
    const QBrush barBrush() const;

    /**
     * Set the brush to use for drawing bars for this object
     * @b The brush to use
     */
    void setBarBrush( const QBrush &b );

    /**
     * @return the list of PlotPoints that make up this object
     */
    QList< PlotPoint* > points() const;

    /**
     * Add a point to the object's list of points, using input data to construct a PlotPoint.
     * @param p the QPointF to add.
     * @param label the optional text label for this point
     * @param barWidth the width of the bar, if this object is to be drawn with bars
     * @return a reference to the PlotPoint added.
     * @note if @param barWidth is left at its default value of 0.0, then the width will be
     * automatically set to the distance between this point and the one to its right.
     */
    PlotPoint* addPoint( const QPointF &p, const QString &label = QString(), double barWidth = 0.0 );

    /**
     * Add a given PlotPoint to the object's list of points.
     * @overload
     * @param p pointer to the PlotPoint to add.
     * @return a reference to the PlotPoint added.
     */
    PlotPoint* addPoint( PlotPoint *p );

    /**
     * Add a point to the object's list of points, using input data to construct a PlotPoint.
     * @overload
     * @param x the X-coordinate of the point to add.
     * @param y the Y-coordinate of the point to add.
     * @param label the optional text label
     * @param barWidth the width of the bar, if this object is to be drawn with bars
     * @return a reference to the PlotPoint added.
     * @note if @param barWidth is left at its default value of 0.0, then the width will be
     * automatically set to the distance between this point and the one to its right.
     */
    PlotPoint* addPoint( double x, double y, const QString &label = QString(), double barWidth = 0.0 );

    /**
     * Remove the QPointF at position index from the list of points
     * @param index the index of the point to be removed.
     */
    void removePoint( int index );

    /**
     * Return a reference to the PlotPoint at the specified index.
     * @param ind index of point to be returned
     */
    PlotPoint* at( int index );

    /**
     * Remove and destroy the points of this object
     */
    void clearPoints();

    /**
     * Draw this PlotObject on the given QPainter
     * @param p The QPainter to draw on
     * @param pw the PlotWidget to draw on (this is needed
     * for the PlotWidget::mapToWidget() function)
     */
    void draw( QPainter *p, PlotWidget *pw );

    /**
     * Draw this PlotObject on the given QPainter
     * @param p The QPainter to draw on
     * @param pixRect the QRect that defines the actual plot area. Needed
     * conversion between data and image coordinates.
     * @param dataRect QRect containing the plot limits in data units
     */
    void drawImage( QPainter *painter, QRect *pixRect, QRectF *dataRect);

  private:
    class Private;
    Private * const d;

    Q_DISABLE_COPY( PlotObject )
  };
  Q_DECLARE_OPERATORS_FOR_FLAGS( PlotObject::PlotTypes )

}
#endif