qwt_abstract_scale_draw.h

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/******************************************************************************
 * 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"
 
class QwtText;
class QPalette;
class QPainter;
class QFont;
class QwtTransform;
class QwtScaleMap;
 
class QWT_EXPORT QwtAbstractScaleDraw
{
  public:
 
    enum ScaleComponent
    {
        Backbone = 0x01,
 
        Ticks = 0x02,
 
        Labels = 0x04
    };
 
    Q_DECLARE_FLAGS( ScaleComponents, ScaleComponent )
 
    QwtAbstractScaleDraw();
    virtual ~QwtAbstractScaleDraw();
 
    void setScaleDiv( const QwtScaleDiv& );
    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 );
    double spacing() const;
 
    void setPenWidthF( qreal width );
    qreal penWidthF() 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;
 
    void invalidateCache();
 
  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;
 
    const QwtText& tickLabel( const QFont&, double value ) const;
 
  private:
    Q_DISABLE_COPY(QwtAbstractScaleDraw)
 
    class PrivateData;
    PrivateData* m_data;
};
 
Q_DECLARE_OPERATORS_FOR_FLAGS( QwtAbstractScaleDraw::ScaleComponents )
 
#endif