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# qwt_abstract_scale_draw.h

    00001 /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
    00002  * Qwt Widget Library
    00003  * Copyright (C) 1997   Josef Wilgen
    00004  * Copyright (C) 2002   Uwe Rathmann
    00005  *
    00006  * This library is free software; you can redistribute it and/or
    00007  * modify it under the terms of the Qwt License, Version 1.0
    00008  *****************************************************************************/
    00009
    00010 #ifndef QWT_ABSTRACT_SCALE_DRAW_H
    00011 #define QWT_ABSTRACT_SCALE_DRAW_H
    00012
    00013 #include "qwt_global.h"
    00014 #include "qwt_scale_div.h"
    00015 #include "qwt_text.h"
    00016
    00017
    00018 #if QT_VERSION < 0x040000
    00019 class QColorGroup;
    00020 #else
    00021 class QPalette;
    00022 #endif
    00023 class QPainter;
    00024 class QFont;
    00025 class QwtScaleTransformation;
    00026 class QwtScaleMap;
    00027
    00037 class QWT_EXPORT QwtAbstractScaleDraw
    00038 {
    00039 public:
    00040
    00051     enum ScaleComponent
    00052     {
    00053         Backbone = 1,
    00054         Ticks = 2,
    00055         Labels = 4
    00056     };
    00057
    00058     QwtAbstractScaleDraw();
    00059     QwtAbstractScaleDraw( const QwtAbstractScaleDraw & );
    00060     virtual ~QwtAbstractScaleDraw();
    00061
    00062     QwtAbstractScaleDraw &operator=(const QwtAbstractScaleDraw &);
    00063
    00064     void setScaleDiv(const QwtScaleDiv &s);
    00065     const QwtScaleDiv& scaleDiv() const;
    00066
    00067     void setTransformation(QwtScaleTransformation *);
    00068     const QwtScaleMap &map() const;
    00069
    00070     void enableComponent(ScaleComponent, bool enable = true);
    00071     bool hasComponent(ScaleComponent) const;
    00072
    00073     void setTickLength(QwtScaleDiv::TickType, int length);
    00074     int tickLength(QwtScaleDiv::TickType) const;
    00075     int majTickLength() const;
    00076
    00077     void setSpacing(int margin);
    00078     int spacing() const;
    00079
    00080 #if QT_VERSION < 0x040000
    00081     virtual void draw(QPainter *, const QColorGroup &) const;
    00082 #else
    00083     virtual void draw(QPainter *, const QPalette &) const;
    00084 #endif
    00085
    00086     virtual QwtText label(double) const;
    00087
    00097     virtual int extent(const QPen &, const QFont &) const = 0;
    00098
    00099     void setMinimumExtent(int);
    00100     int minimumExtent() const;
    00101
    00102     QwtScaleMap &scaleMap();
    00103
    00104 protected:
    00114     virtual void drawTick(QPainter *painter, double value, int len) const = 0;
    00115
    00122     virtual void drawBackbone(QPainter *painter) const = 0;
    00123
    00132     virtual void drawLabel(QPainter *painter, double value) const = 0;
    00133
    00134     void invalidateCache();
    00135     const QwtText &tickLabel(const QFont &, double value) const;
    00136
    00137 private:
    00138     int operator==(const QwtAbstractScaleDraw &) const;
    00139     int operator!=(const QwtAbstractScaleDraw &) const;
    00140
    00141     class PrivateData;
    00142     PrivateData *d_data;
    00143 };
    00144
    00145 #endif