omggraph.h

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/***************************************************************************
                          omgguid.h  -  description
                             -------------------
    begin                : April 2007
    copyright            : (C) 2007 by Tim Sutton
    email                : tim@linfiniti.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 OMGGRAPH_H
#define OMGGRAPH_H
#include "omgdataseries.h"

#include <QString>
#include <QPainter>
#include <QLinearGradient>
#include <QList>
#include <QColor>
class OMG_LIB_EXPORT OmgGraph 
{
  public:
    OmgGraph(QPainter * thepPainter);
    virtual ~OmgGraph();
    void render( );
    void addSeries(OmgDataSeries);
    bool removeSeriesAt(int theSeriesNo);
    int seriesCount() const;
    void clear(QColor theColour=Qt::white);



// accessors and mutators
    void setAxisFont(QFont theFont);
    void setLegendFont(QFont theFont);
    void setVertexLabelFont(QFont theFont);
    
    void setGridLinesEnabled(bool theFlag=true);
    bool hasGridLinesEnabled();
    
    void setVerticesEnabled(bool theFlag=true);
    bool hasVerticesEnabled();

    void setVertexLabelsEnabled(bool theFlag=true);
    bool hasVertexLabelsEnabled();

    void setDiagonalEnabled(bool theFlag=true);
    bool hasDiagonalEnabled();

    void setSpliningEnabled(bool theFlag=true);
    bool hasSpliningEnabled();
    
    void setAreaFillEnabled(bool theFlag=true);
    bool hasAreaFillEnabled();
  private:
    //private ctor - one of the public ctors should be used by clients
    OmgGraph();
    void drawHighlight( QPointF theTopLeftPoint, QPointF theBottomRightPoint );
    //called by ctors to prepare class
    void initialise(); 
    QLinearGradient greenGradient();
    QLinearGradient redGradient();
    QLinearGradient blueGradient();
    QLinearGradient grayGradient();
    QLinearGradient customGradient(QColor theColour);
    QLinearGradient randomGradient();
    QLinearGradient highlightGradient();

    qreal mGradientHeight;
    qreal mGradientWidth;
    
    void drawAxes();
    void drawDiagonal();
    void makeLegend();
    void calculateGutters();
    void calculateLegendHeight();

    //
    // data members
    //
    
    QPainter * mpPainter;
    QList <OmgDataSeries> mSeriesList;
    
    int mImageHeight;
    int mImageWidth;
    
    int mGraphImageWidth;
    int mGraphImageHeight;
    
    float mXAxisMin;
    float mXAxisMax;
    int mXGutterWidth;
    int mXGutterHeight;
    int mLegendHeight;
    
    float mYAxisMin;
    float mYAxisMax;
    int mYGutterWidth;
    int mYGutterHeight;

    QFont mAxisFont;
    QFont mLegendFont;
    QFont mVertexLabelFont;

    
    bool mGridLinesFlag;
    bool mShowVerticesFlag;
    bool mDrawDiagonal;
    bool mShowVertexLabelsFlag;
    bool mSplinePointsFlag;
    bool mAreaFillFlag;
};

#endif //OMGGRAPH_H

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