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"

class QPalette;
class QPainter;
class QFont;
class QwtTransform;
class QwtScaleMap;

class QWT_EXPORT QwtAbstractScaleDraw
{
public:

    enum ScaleComponent
    {
        Backbone = 0x01,

        Ticks = 0x02,

        Labels = 0x04
    };

    typedef QFlags<ScaleComponent> ScaleComponents;

    QwtAbstractScaleDraw();
    virtual ~QwtAbstractScaleDraw();

    void setScaleDiv( const QwtScaleDiv &s );
    const QwtScaleDiv& scaleDiv() const;

    void setTransformation( QwtTransform * );
    const QwtScaleMap &scaleMap() const;
    QwtScaleMap &scaleMap();

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

    void setTickLength( QwtScaleDiv::TickType, double length );
    double tickLength( QwtScaleDiv::TickType ) const;
    double maxTickLength() const;

    void setSpacing( double margin );
    double spacing() const;

    void setPenWidth( int width );
    int penWidth() const;

    virtual void draw( QPainter *, const QPalette & ) const;

    virtual QwtText label( double ) const;

    virtual double extent( const QFont &font ) const = 0;

    void setMinimumExtent( double );
    double minimumExtent() const;

protected:
    virtual void drawTick( QPainter *painter, double value, double 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:
    QwtAbstractScaleDraw( const QwtAbstractScaleDraw & );
    QwtAbstractScaleDraw &operator=( const QwtAbstractScaleDraw & );

    class PrivateData;
    PrivateData *d_data;
};

Q_DECLARE_OPERATORS_FOR_FLAGS( QwtAbstractScaleDraw::ScaleComponents )

#endif