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314 lines
8.3 KiB
C++
314 lines
8.3 KiB
C++
/* -*- 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_PLOT_H
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#define QWT_PLOT_H
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#include "qwt_global.h"
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#include "qwt_text.h"
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#include "qwt_plot_dict.h"
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#include "qwt_scale_map.h"
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#include "qwt_interval.h"
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#include <qframe.h>
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#include <qlist.h>
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#include <qvariant.h>
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class QwtPlotLayout;
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class QwtAbstractLegend;
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class QwtScaleWidget;
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class QwtScaleEngine;
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class QwtScaleDiv;
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class QwtScaleDraw;
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class QwtTextLabel;
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/*!
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\brief A 2-D plotting widget
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QwtPlot is a widget for plotting two-dimensional graphs.
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An unlimited number of plot items can be displayed on
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its canvas. Plot items might be curves (QwtPlotCurve), markers
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(QwtPlotMarker), the grid (QwtPlotGrid), or anything else derived
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from QwtPlotItem.
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A plot can have up to four axes, with each plot item attached to an x- and
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a y axis. The scales at the axes can be explicitly set (QwtScaleDiv), or
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are calculated from the plot items, using algorithms (QwtScaleEngine) which
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can be configured separately for each axis.
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The simpleplot example is a good starting point to see how to set up a
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plot widget.
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\image html plot.png
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\par Example
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The following example shows (schematically) the most simple
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way to use QwtPlot. By default, only the left and bottom axes are
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visible and their scales are computed automatically.
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\code
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#include <qwt_plot.h>
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#include <qwt_plot_curve.h>
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QwtPlot *myPlot = new QwtPlot( "Two Curves", parent );
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// add curves
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QwtPlotCurve *curve1 = new QwtPlotCurve( "Curve 1" );
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QwtPlotCurve *curve2 = new QwtPlotCurve( "Curve 2" );
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// connect or copy the data to the curves
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curve1->setData( ... );
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curve2->setData( ... );
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curve1->attach( myPlot );
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curve2->attach( myPlot );
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// finally, refresh the plot
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myPlot->replot();
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\endcode
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\endpar
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*/
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class QWT_EXPORT QwtPlot: public QFrame, public QwtPlotDict
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{
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Q_OBJECT
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Q_PROPERTY( QBrush canvasBackground
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READ canvasBackground WRITE setCanvasBackground )
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Q_PROPERTY( bool autoReplot READ autoReplot WRITE setAutoReplot )
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#if 0
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// This property is intended to configure the plot
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// widget from a special dialog in the deigner plugin.
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// Disabled until such a dialog has been implemented.
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Q_PROPERTY( QString propertiesDocument
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READ grabProperties WRITE applyProperties )
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#endif
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public:
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//! \brief Axis index
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enum Axis
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{
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//! Y axis left of the canvas
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yLeft,
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//! Y axis right of the canvas
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yRight,
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//! X axis below the canvas
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xBottom,
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//! X axis above the canvas
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xTop,
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//! Number of axes
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axisCnt
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};
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/*!
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Position of the legend, relative to the canvas.
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\sa insertLegend()
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*/
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enum LegendPosition
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{
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//! The legend will be left from the QwtPlot::yLeft axis.
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LeftLegend,
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//! The legend will be right from the QwtPlot::yRight axis.
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RightLegend,
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//! The legend will be below the footer
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BottomLegend,
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//! The legend will be above the title
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TopLegend
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};
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explicit QwtPlot( QWidget * = NULL );
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explicit QwtPlot( const QwtText &title, QWidget * = NULL );
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virtual ~QwtPlot();
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void applyProperties( const QString & );
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QString grabProperties() const;
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void setAutoReplot( bool = true );
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bool autoReplot() const;
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// Layout
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void setPlotLayout( QwtPlotLayout * );
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QwtPlotLayout *plotLayout();
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const QwtPlotLayout *plotLayout() const;
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// Title
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void setTitle( const QString & );
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void setTitle( const QwtText & );
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QwtText title() const;
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QwtTextLabel *titleLabel();
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const QwtTextLabel *titleLabel() const;
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// Footer
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void setFooter( const QString & );
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void setFooter( const QwtText & );
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QwtText footer() const;
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QwtTextLabel *footerLabel();
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const QwtTextLabel *footerLabel() const;
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// Canvas
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void setCanvas( QWidget * );
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QWidget *canvas();
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const QWidget *canvas() const;
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void setCanvasBackground( const QBrush & );
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QBrush canvasBackground() const;
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virtual QwtScaleMap canvasMap( int axisId ) const;
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double invTransform( int axisId, int pos ) const;
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double transform( int axisId, double value ) const;
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// Axes
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QwtScaleEngine *axisScaleEngine( int axisId );
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const QwtScaleEngine *axisScaleEngine( int axisId ) const;
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void setAxisScaleEngine( int axisId, QwtScaleEngine * );
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void setAxisAutoScale( int axisId, bool on = true );
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bool axisAutoScale( int axisId ) const;
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void enableAxis( int axisId, bool tf = true );
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bool axisEnabled( int axisId ) const;
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void setAxisFont( int axisId, const QFont & );
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QFont axisFont( int axisId ) const;
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void setAxisScale( int axisId, double min, double max, double stepSize = 0 );
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void setAxisScaleDiv( int axisId, const QwtScaleDiv & );
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void setAxisScaleDraw( int axisId, QwtScaleDraw * );
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double axisStepSize( int axisId ) const;
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QwtInterval axisInterval( int axisId ) const;
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const QwtScaleDiv &axisScaleDiv( int axisId ) const;
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const QwtScaleDraw *axisScaleDraw( int axisId ) const;
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QwtScaleDraw *axisScaleDraw( int axisId );
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const QwtScaleWidget *axisWidget( int axisId ) const;
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QwtScaleWidget *axisWidget( int axisId );
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void setAxisLabelAlignment( int axisId, Qt::Alignment );
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void setAxisLabelRotation( int axisId, double rotation );
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void setAxisTitle( int axisId, const QString & );
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void setAxisTitle( int axisId, const QwtText & );
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QwtText axisTitle( int axisId ) const;
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void setAxisMaxMinor( int axisId, int maxMinor );
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int axisMaxMinor( int axisId ) const;
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void setAxisMaxMajor( int axisId, int maxMajor );
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int axisMaxMajor( int axisId ) const;
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// Legend
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void insertLegend( QwtAbstractLegend *,
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LegendPosition = QwtPlot::RightLegend, double ratio = -1.0 );
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QwtAbstractLegend *legend();
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const QwtAbstractLegend *legend() const;
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void updateLegend();
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void updateLegend( const QwtPlotItem * );
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// Misc
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virtual QSize sizeHint() const;
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virtual QSize minimumSizeHint() const;
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virtual void updateLayout();
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virtual void drawCanvas( QPainter * );
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void updateAxes();
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void updateCanvasMargins();
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virtual void getCanvasMarginsHint(
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const QwtScaleMap maps[], const QRectF &canvasRect,
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double &left, double &top, double &right, double &bottom) const;
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virtual bool event( QEvent * );
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virtual bool eventFilter( QObject *, QEvent * );
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virtual void drawItems( QPainter *, const QRectF &,
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const QwtScaleMap maps[axisCnt] ) const;
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virtual QVariant itemToInfo( QwtPlotItem * ) const;
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virtual QwtPlotItem *infoToItem( const QVariant & ) const;
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Q_SIGNALS:
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/*!
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A signal indicating, that an item has been attached/detached
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\param plotItem Plot item
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\param on Attached/Detached
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*/
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void itemAttached( QwtPlotItem *plotItem, bool on );
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/*!
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A signal with the attributes how to update
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the legend entries for a plot item.
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\param itemInfo Info about a plot item, build from itemToInfo()
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\param data Attributes of the entries ( usually <= 1 ) for
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the plot item.
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\sa itemToInfo(), infoToItem(), QwtAbstractLegend::updateLegend()
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*/
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void legendDataChanged( const QVariant &itemInfo,
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const QList<QwtLegendData> &data );
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public Q_SLOTS:
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virtual void replot();
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void autoRefresh();
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protected:
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static bool axisValid( int axisId );
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virtual void resizeEvent( QResizeEvent *e );
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private Q_SLOTS:
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void updateLegendItems( const QVariant &itemInfo,
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const QList<QwtLegendData> &legendData );
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private:
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friend class QwtPlotItem;
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void attachItem( QwtPlotItem *, bool );
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void initAxesData();
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void deleteAxesData();
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void updateScaleDiv();
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void initPlot( const QwtText &title );
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class AxisData;
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AxisData *d_axisData[axisCnt];
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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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