KDChartMeasure.h

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/* -*- Mode: C++ -*-
   KDChart - a multi-platform charting engine
   */

/****************************************************************************
 ** Copyright (C) 2005-2007 Klarälvdalens Datakonsult AB.  All rights reserved.
 **
 ** This file is part of the KD Chart library.
 **
 ** This file may be distributed and/or modified under the terms of the
 ** GNU General Public License version 2 as published by the Free Software
 ** Foundation and appearing in the file LICENSE.GPL included in the
 ** packaging of this file.
 **
 ** Licensees holding valid commercial KD Chart licenses may use this file in
 ** accordance with the KD Chart Commercial License Agreement provided with
 ** the Software.
 **
 ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 **
 ** See http://www.kdab.net/kdchart for
 **   information about KD Chart Commercial License Agreements.
 **
 ** Contact info@kdab.net if any conditions of this
 ** licensing are not clear to you.
 **
 **********************************************************************/

#ifndef KDCHARTMEASURE_H
#define KDCHARTMEASURE_H

#include <QDebug>
#include <Qt>
#include <QStack>
#include "KDChartGlobal.h"
#include "KDChartEnums.h"

class QObject;
class QPaintDevice;

namespace KDChart {

class KDCHART_EXPORT Measure
{
public:
    Measure();
    /*implicit*/ Measure( qreal value,
                          KDChartEnums::MeasureCalculationMode mode = KDChartEnums::MeasureCalculationModeAuto,
                          KDChartEnums::MeasureOrientation orientation = KDChartEnums::MeasureOrientationAuto );
    Measure( const Measure& );
    Measure &operator= ( const Measure& );

    void setValue( qreal val ){ mValue = val; }
    qreal value() const { return mValue; }

    void setCalculationMode( KDChartEnums::MeasureCalculationMode mode ){ mMode = mode; }
    KDChartEnums::MeasureCalculationMode calculationMode() const { return mMode; }

    void setRelativeMode( const QObject * area,
                          KDChartEnums::MeasureOrientation orientation )
    {
        mMode = KDChartEnums::MeasureCalculationModeRelative;
        mArea = area;
        mOrientation = orientation;
    }

    void setAbsoluteValue( qreal val )
    {
        mMode = KDChartEnums::MeasureCalculationModeAbsolute;
        mValue = val;
    }

    void setReferenceArea( const QObject * area ){ mArea = area; }
    const QObject * referenceArea() const { return mArea; }

    void setReferenceOrientation( KDChartEnums::MeasureOrientation orientation ){ mOrientation = orientation; }
    KDChartEnums::MeasureOrientation referenceOrientation() const { return mOrientation; }

    qreal calculatedValue( const QObject * autoArea, KDChartEnums::MeasureOrientation autoOrientation ) const;
    qreal calculatedValue( const QSizeF& autoSize, KDChartEnums::MeasureOrientation autoOrientation ) const;
    const QSizeF sizeOfArea( const QObject* area ) const;

    bool operator==( const Measure& ) const;
    bool operator!=( const Measure& other ) const { return !operator==(other); }

private:
    qreal mValue;
    KDChartEnums::MeasureCalculationMode mMode;
    const QObject* mArea;
    KDChartEnums::MeasureOrientation mOrientation;
}; // End of class Measure



class GlobalMeasureScaling
{
public:
    static GlobalMeasureScaling* instance();

    GlobalMeasureScaling();
    virtual ~GlobalMeasureScaling();

public:
    static void setFactors(qreal factorX, qreal factorY);

    static void resetFactors();

    static const QPair< qreal, qreal > currentFactors();

    static void setPaintDevice( QPaintDevice* paintDevice );

    static QPaintDevice* paintDevice();

private:
    QStack< QPair< qreal, qreal > > mFactors;
    QPaintDevice* m_paintDevice;
};

}

#if !defined(QT_NO_DEBUG_STREAM)
KDCHART_EXPORT QDebug operator<<(QDebug, const KDChart::Measure& );
#endif /* QT_NO_DEBUG_STREAM */

#endif // KDCHARTMEASURE_H

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