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141 lines
3.5 KiB
141 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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class QPalette; |
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class QPainter; |
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class QFont; |
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class QwtTransform; |
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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 setScaleDiv(), the scale can be drawn with the 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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\sa enableComponent(), hasComponent |
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*/ |
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enum ScaleComponent |
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{ |
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//! Backbone = the line where the ticks are located |
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Backbone = 0x01, |
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//! Ticks |
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Ticks = 0x02, |
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//! Labels |
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Labels = 0x04 |
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}; |
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//! Scale components |
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typedef QFlags<ScaleComponent> ScaleComponents; |
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QwtAbstractScaleDraw(); |
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virtual ~QwtAbstractScaleDraw(); |
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void setScaleDiv( const QwtScaleDiv &s ); |
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const QwtScaleDiv& scaleDiv() const; |
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void setTransformation( QwtTransform * ); |
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const QwtScaleMap &scaleMap() const; |
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QwtScaleMap &scaleMap(); |
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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, double length ); |
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double tickLength( QwtScaleDiv::TickType ) const; |
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double maxTickLength() const; |
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void setSpacing( double margin ); |
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double spacing() const; |
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void setPenWidth( int width ); |
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int penWidth() const; |
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virtual void draw( QPainter *, const QPalette & ) const; |
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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 distance 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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\param font Font used for drawing the tick labels |
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\return Number of pixels |
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\sa setMinimumExtent(), minimumExtent() |
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*/ |
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virtual double extent( const QFont &font ) const = 0; |
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void setMinimumExtent( double ); |
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double minimumExtent() const; |
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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 Length 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, double 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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QwtAbstractScaleDraw( const QwtAbstractScaleDraw & ); |
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QwtAbstractScaleDraw &operator=( const QwtAbstractScaleDraw & ); |
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class PrivateData; |
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PrivateData *d_data; |
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}; |
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Q_DECLARE_OPERATORS_FOR_FLAGS( QwtAbstractScaleDraw::ScaleComponents ) |
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#endif
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