142 lines
3.5 KiB
C
142 lines
3.5 KiB
C
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/* -*- 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 & );
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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 );
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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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