qwt_abstract_scale_draw.h

/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
 * Qwt Widget Library
 * Copyright (C) 1997   Josef Wilgen
 * Copyright (C) 2002   Uwe Rathmann
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the Qwt License, Version 1.0
 *****************************************************************************/

#ifndef QWT_ABSTRACT_SCALE_DRAW_H
#define QWT_ABSTRACT_SCALE_DRAW_H

#include "qwt_global.h"
#include "qwt_scale_div.h"
#include "qwt_text.h"


#if QT_VERSION < 0x040000
class QColorGroup;
#else
class QPalette;
#endif
class QPainter;
class QFont;
class QwtScaleTransformation;
class QwtScaleMap;

class QWT_EXPORT QwtAbstractScaleDraw
{
public:

    enum ScaleComponent
    { 
        Backbone = 1,
        Ticks = 2,
        Labels = 4
    };
 
    QwtAbstractScaleDraw();
    QwtAbstractScaleDraw( const QwtAbstractScaleDraw & );
    virtual ~QwtAbstractScaleDraw();

    QwtAbstractScaleDraw &operator=(const QwtAbstractScaleDraw &);
    
    void setScaleDiv(const QwtScaleDiv &s);
    const QwtScaleDiv& scaleDiv() const;

    void setTransformation(QwtScaleTransformation *);
    const QwtScaleMap &map() const;

    void enableComponent(ScaleComponent, bool enable = true);
    bool hasComponent(ScaleComponent) const;

    void setTickLength(QwtScaleDiv::TickType, int length);
    int tickLength(QwtScaleDiv::TickType) const;
    int majTickLength() const;

    void setSpacing(int margin);
    int spacing() const;
        
#if QT_VERSION < 0x040000
    virtual void draw(QPainter *, const QColorGroup &) const;
#else
    virtual void draw(QPainter *, const QPalette &) const;
#endif

    virtual QwtText label(double) const;

    virtual int extent(const QPen &, const QFont &) const = 0;

    void setMinimumExtent(int);
    int minimumExtent() const;

    QwtScaleMap &scaleMap();

protected:
    virtual void drawTick(QPainter *painter, double value, int len) const = 0;

    virtual void drawBackbone(QPainter *painter) const = 0;

    virtual void drawLabel(QPainter *painter, double value) const = 0;

    void invalidateCache();
    const QwtText &tickLabel(const QFont &, double value) const;

private:
    int operator==(const QwtAbstractScaleDraw &) const;
    int operator!=(const QwtAbstractScaleDraw &) const;

    class PrivateData;
    PrivateData *d_data;
};

#endif