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145 lines
3.5 KiB
145 lines
3.5 KiB
/* -*- mode: C++ ; c-file-style: "stroustrup" -*- ***************************** |
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* Qwt Widget Library |
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* Copyright (C) 1997 Josef Wilgen |
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* Copyright (C) 2002 Uwe Rathmann |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the Qwt License, Version 1.0 |
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*****************************************************************************/ |
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#ifndef QWT_ABSTRACT_SCALE_DRAW_H |
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#define QWT_ABSTRACT_SCALE_DRAW_H |
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#include "qwt_global.h" |
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#include "qwt_scale_div.h" |
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#include "qwt_text.h" |
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#if QT_VERSION < 0x040000 |
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class QColorGroup; |
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#else |
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class QPalette; |
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#endif |
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class QPainter; |
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class QFont; |
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class QwtScaleTransformation; |
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class QwtScaleMap; |
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/*! |
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\brief A abstract base class for drawing scales |
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QwtAbstractScaleDraw can be used to draw linear or logarithmic scales. |
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After a scale division has been specified as a QwtScaleDiv object |
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using QwtAbstractScaleDraw::setScaleDiv(const QwtScaleDiv &s), |
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the scale can be drawn with the QwtAbstractScaleDraw::draw() member. |
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*/ |
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class QWT_EXPORT QwtAbstractScaleDraw |
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{ |
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public: |
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/*! |
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Components of a scale |
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- Backbone |
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- Ticks |
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- Labels |
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\sa QwtAbstractScaleDraw::enableComponent, |
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QwtAbstractScaleDraw::hasComponent |
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*/ |
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enum ScaleComponent { |
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Backbone = 1, |
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Ticks = 2, |
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Labels = 4 |
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}; |
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QwtAbstractScaleDraw(); |
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QwtAbstractScaleDraw( const QwtAbstractScaleDraw & ); |
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virtual ~QwtAbstractScaleDraw(); |
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QwtAbstractScaleDraw &operator=(const QwtAbstractScaleDraw &); |
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void setScaleDiv(const QwtScaleDiv &s); |
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const QwtScaleDiv& scaleDiv() const; |
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void setTransformation(QwtScaleTransformation *); |
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const QwtScaleMap &map() const; |
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void enableComponent(ScaleComponent, bool enable = true); |
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bool hasComponent(ScaleComponent) const; |
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void setTickLength(QwtScaleDiv::TickType, int length); |
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int tickLength(QwtScaleDiv::TickType) const; |
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int majTickLength() const; |
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void setSpacing(int margin); |
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int spacing() const; |
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#if QT_VERSION < 0x040000 |
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virtual void draw(QPainter *, const QColorGroup &) const; |
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#else |
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virtual void draw(QPainter *, const QPalette &) const; |
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#endif |
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virtual QwtText label(double) const; |
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/*! |
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Calculate the extent |
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The extent is the distcance from the baseline to the outermost |
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pixel of the scale draw in opposite to its orientation. |
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It is at least minimumExtent() pixels. |
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\sa setMinimumExtent(), minimumExtent() |
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*/ |
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virtual int extent(const QPen &, const QFont &) const = 0; |
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void setMinimumExtent(int); |
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int minimumExtent() const; |
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QwtScaleMap &scaleMap(); |
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protected: |
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/*! |
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Draw a tick |
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\param painter Painter |
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\param value Value of the tick |
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\param len Lenght of the tick |
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\sa drawBackbone(), drawLabel() |
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*/ |
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virtual void drawTick(QPainter *painter, double value, int len) const = 0; |
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/*! |
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Draws the baseline of the scale |
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\param painter Painter |
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\sa drawTick(), drawLabel() |
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*/ |
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virtual void drawBackbone(QPainter *painter) const = 0; |
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/*! |
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Draws the label for a major scale tick |
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\param painter Painter |
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\param value Value |
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\sa drawTick, drawBackbone |
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*/ |
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virtual void drawLabel(QPainter *painter, double value) const = 0; |
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void invalidateCache(); |
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const QwtText &tickLabel(const QFont &, double value) const; |
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private: |
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int operator==(const QwtAbstractScaleDraw &) const; |
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int operator!=(const QwtAbstractScaleDraw &) const; |
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class PrivateData; |
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PrivateData *d_data; |
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}; |
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#endif
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