diff options
Diffstat (limited to 'src/libpcp_qwt/src/qwt_plot_axis.cpp')
| -rw-r--r-- | src/libpcp_qwt/src/qwt_plot_axis.cpp | 670 |
1 files changed, 670 insertions, 0 deletions
diff --git a/src/libpcp_qwt/src/qwt_plot_axis.cpp b/src/libpcp_qwt/src/qwt_plot_axis.cpp new file mode 100644 index 0000000..66f2fa1 --- /dev/null +++ b/src/libpcp_qwt/src/qwt_plot_axis.cpp @@ -0,0 +1,670 @@ +/* -*- mode: C++ ; c-file-style: "stroustrup" -*- ***************************** + * Qwt Widget Library + * Copyright (C) 1997 Josef Wilgen + * Copyright (C) 2002 Uwe Rathmann + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the Qwt License, Version 1.0 + *****************************************************************************/ + +#include "qwt_plot.h" +#include "qwt_math.h" +#include "qwt_scale_widget.h" +#include "qwt_scale_div.h" +#include "qwt_scale_engine.h" + +class QwtPlot::AxisData +{ +public: + bool isEnabled; + bool doAutoScale; + + double minValue; + double maxValue; + double stepSize; + + int maxMajor; + int maxMinor; + + QwtScaleDiv scaleDiv; + QwtScaleEngine *scaleEngine; + QwtScaleWidget *scaleWidget; +}; + +//! Initialize axes +void QwtPlot::initAxesData() +{ + int axisId; + + for ( axisId = 0; axisId < axisCnt; axisId++ ) + d_axisData[axisId] = new AxisData; + + d_axisData[yLeft]->scaleWidget = + new QwtScaleWidget( QwtScaleDraw::LeftScale, this ); + d_axisData[yRight]->scaleWidget = + new QwtScaleWidget( QwtScaleDraw::RightScale, this ); + d_axisData[xTop]->scaleWidget = + new QwtScaleWidget( QwtScaleDraw::TopScale, this ); + d_axisData[xBottom]->scaleWidget = + new QwtScaleWidget( QwtScaleDraw::BottomScale, this ); + + d_axisData[yLeft]->scaleWidget->setObjectName( "QwtPlotAxisYLeft" ); + d_axisData[yRight]->scaleWidget->setObjectName( "QwtPlotAxisYRight" ); + d_axisData[xTop]->scaleWidget->setObjectName( "QwtPlotAxisXTop" ); + d_axisData[xBottom]->scaleWidget->setObjectName( "QwtPlotAxisXBottom" ); + + QFont fscl( fontInfo().family(), 10 ); + QFont fttl( fontInfo().family(), 12, QFont::Bold ); + + for ( axisId = 0; axisId < axisCnt; axisId++ ) + { + AxisData &d = *d_axisData[axisId]; + + d.scaleWidget->setFont( fscl ); + d.scaleWidget->setMargin( 2 ); + + QwtText text = d.scaleWidget->title(); + text.setFont( fttl ); + d.scaleWidget->setTitle( text ); + + d.doAutoScale = true; + + d.minValue = 0.0; + d.maxValue = 1000.0; + d.stepSize = 0.0; + + d.maxMinor = 5; + d.maxMajor = 8; + + d.scaleEngine = new QwtLinearScaleEngine; + + d.scaleDiv.invalidate(); + } + + d_axisData[yLeft]->isEnabled = true; + d_axisData[yRight]->isEnabled = false; + d_axisData[xBottom]->isEnabled = true; + d_axisData[xTop]->isEnabled = false; +} + +void QwtPlot::deleteAxesData() +{ + for ( int axisId = 0; axisId < axisCnt; axisId++ ) + { + delete d_axisData[axisId]->scaleEngine; + delete d_axisData[axisId]; + d_axisData[axisId] = NULL; + } +} + +/*! + \return specified axis, or NULL if axisId is invalid. + \param axisId axis index +*/ +const QwtScaleWidget *QwtPlot::axisWidget( int axisId ) const +{ + if ( axisValid( axisId ) ) + return d_axisData[axisId]->scaleWidget; + + return NULL; +} + +/*! + \return specified axis, or NULL if axisId is invalid. + \param axisId axis index +*/ +QwtScaleWidget *QwtPlot::axisWidget( int axisId ) +{ + if ( axisValid( axisId ) ) + return d_axisData[axisId]->scaleWidget; + + return NULL; +} + +/*! + Change the scale engine for an axis + + \param axisId axis index + \param scaleEngine Scale engine + + \sa axisScaleEngine() +*/ +void QwtPlot::setAxisScaleEngine( int axisId, QwtScaleEngine *scaleEngine ) +{ + if ( axisValid( axisId ) && scaleEngine != NULL ) + { + AxisData &d = *d_axisData[axisId]; + + delete d.scaleEngine; + d.scaleEngine = scaleEngine; + + d.scaleDiv.invalidate(); + + autoRefresh(); + } +} + +/*! + \param axisId axis index + \return Scale engine for a specific axis +*/ +QwtScaleEngine *QwtPlot::axisScaleEngine( int axisId ) +{ + if ( axisValid( axisId ) ) + return d_axisData[axisId]->scaleEngine; + else + return NULL; +} + +/*! + \param axisId axis index + \return Scale engine for a specific axis +*/ +const QwtScaleEngine *QwtPlot::axisScaleEngine( int axisId ) const +{ + if ( axisValid( axisId ) ) + return d_axisData[axisId]->scaleEngine; + else + return NULL; +} +/*! + \return \c true if autoscaling is enabled + \param axisId axis index +*/ +bool QwtPlot::axisAutoScale( int axisId ) const +{ + if ( axisValid( axisId ) ) + return d_axisData[axisId]->doAutoScale; + else + return false; + +} + +/*! + \return \c true if a specified axis is enabled + \param axisId axis index +*/ +bool QwtPlot::axisEnabled( int axisId ) const +{ + if ( axisValid( axisId ) ) + return d_axisData[axisId]->isEnabled; + else + return false; +} + +/*! + \return the font of the scale labels for a specified axis + \param axisId axis index +*/ +QFont QwtPlot::axisFont( int axisId ) const +{ + if ( axisValid( axisId ) ) + return axisWidget( axisId )->font(); + else + return QFont(); + +} + +/*! + \return the maximum number of major ticks for a specified axis + \param axisId axis index + \sa setAxisMaxMajor() +*/ +int QwtPlot::axisMaxMajor( int axisId ) const +{ + if ( axisValid( axisId ) ) + return d_axisData[axisId]->maxMajor; + else + return 0; +} + +/*! + \return the maximum number of minor ticks for a specified axis + \param axisId axis index + \sa setAxisMaxMinor() +*/ +int QwtPlot::axisMaxMinor( int axisId ) const +{ + if ( axisValid( axisId ) ) + return d_axisData[axisId]->maxMinor; + else + return 0; +} + +/*! + \brief Return the scale division of a specified axis + + axisScaleDiv(axisId)->lowerBound(), axisScaleDiv(axisId)->upperBound() + are the current limits of the axis scale. + + \param axisId axis index + \return Scale division + + \sa QwtScaleDiv, setAxisScaleDiv() +*/ +const QwtScaleDiv *QwtPlot::axisScaleDiv( int axisId ) const +{ + if ( !axisValid( axisId ) ) + return NULL; + + return &d_axisData[axisId]->scaleDiv; +} + +/*! + \brief Return the scale division of a specified axis + + axisScaleDiv(axisId)->lowerBound(), axisScaleDiv(axisId)->upperBound() + are the current limits of the axis scale. + + \param axisId axis index + \return Scale division + + \sa QwtScaleDiv, setAxisScaleDiv() +*/ +QwtScaleDiv *QwtPlot::axisScaleDiv( int axisId ) +{ + if ( !axisValid( axisId ) ) + return NULL; + + return &d_axisData[axisId]->scaleDiv; +} + +/*! + \returns the scale draw of a specified axis + \param axisId axis index + \return specified scaleDraw for axis, or NULL if axis is invalid. + \sa QwtScaleDraw +*/ +const QwtScaleDraw *QwtPlot::axisScaleDraw( int axisId ) const +{ + if ( !axisValid( axisId ) ) + return NULL; + + return axisWidget( axisId )->scaleDraw(); +} + +/*! + \returns the scale draw of a specified axis + \param axisId axis index + \return specified scaleDraw for axis, or NULL if axis is invalid. + \sa QwtScaleDraw +*/ +QwtScaleDraw *QwtPlot::axisScaleDraw( int axisId ) +{ + if ( !axisValid( axisId ) ) + return NULL; + + return axisWidget( axisId )->scaleDraw(); +} + +/*! + Return the step size parameter, that has been set + in setAxisScale. This doesn't need to be the step size + of the current scale. + + \param axisId axis index + \return step size parameter value + + \sa setAxisScale() +*/ +double QwtPlot::axisStepSize( int axisId ) const +{ + if ( !axisValid( axisId ) ) + return 0; + + return d_axisData[axisId]->stepSize; +} + +/*! + \brief Return the current interval of the specified axis + + This is only a convenience function for axisScaleDiv( axisId )->interval(); + + \param axisId axis index + \return Scale interval + + \sa QwtScaleDiv, axisScaleDiv() +*/ +QwtInterval QwtPlot::axisInterval( int axisId ) const +{ + if ( !axisValid( axisId ) ) + return QwtInterval(); + + return d_axisData[axisId]->scaleDiv.interval(); +} + +/*! + \return the title of a specified axis + \param axisId axis index +*/ +QwtText QwtPlot::axisTitle( int axisId ) const +{ + if ( axisValid( axisId ) ) + return axisWidget( axisId )->title(); + else + return QwtText(); +} + +/*! + \brief Enable or disable a specified axis + + When an axis is disabled, this only means that it is not + visible on the screen. Curves, markers and can be attached + to disabled axes, and transformation of screen coordinates + into values works as normal. + + Only xBottom and yLeft are enabled by default. + \param axisId axis index + \param tf \c true (enabled) or \c false (disabled) +*/ +void QwtPlot::enableAxis( int axisId, bool tf ) +{ + if ( axisValid( axisId ) && tf != d_axisData[axisId]->isEnabled ) + { + d_axisData[axisId]->isEnabled = tf; + updateLayout(); + } +} + +/*! + Transform the x or y coordinate of a position in the + drawing region into a value. + \param axisId axis index + \param pos position + \warning The position can be an x or a y coordinate, + depending on the specified axis. +*/ +double QwtPlot::invTransform( int axisId, int pos ) const +{ + if ( axisValid( axisId ) ) + return( canvasMap( axisId ).invTransform( pos ) ); + else + return 0.0; +} + + +/*! + \brief Transform a value into a coordinate in the plotting region + \param axisId axis index + \param value value + \return X or y coordinate in the plotting region corresponding + to the value. +*/ +double QwtPlot::transform( int axisId, double value ) const +{ + if ( axisValid( axisId ) ) + return( canvasMap( axisId ).transform( value ) ); + else + return 0.0; +} + +/*! + \brief Change the font of an axis + \param axisId axis index + \param f font + \warning This function changes the font of the tick labels, + not of the axis title. +*/ +void QwtPlot::setAxisFont( int axisId, const QFont &f ) +{ + if ( axisValid( axisId ) ) + axisWidget( axisId )->setFont( f ); +} + +/*! + \brief Enable autoscaling for a specified axis + + This member function is used to switch back to autoscaling mode + after a fixed scale has been set. Autoscaling is enabled by default. + + \param axisId axis index + \param on On/Off + \sa setAxisScale(), setAxisScaleDiv(), updateAxes() + + \note The autoscaling flag has no effect until updateAxes() is executed + ( called by replot() ). +*/ +void QwtPlot::setAxisAutoScale( int axisId, bool on ) +{ + if ( axisValid( axisId ) && ( d_axisData[axisId]->doAutoScale != on ) ) + { + d_axisData[axisId]->doAutoScale = on; + autoRefresh(); + } +} + +/*! + \brief Disable autoscaling and specify a fixed scale for a selected axis. + \param axisId axis index + \param min + \param max minimum and maximum of the scale + \param stepSize Major step size. If <code>step == 0</code>, the step size is + calculated automatically using the maxMajor setting. + \sa setAxisMaxMajor(), setAxisAutoScale(), axisStepSize() +*/ +void QwtPlot::setAxisScale( int axisId, double min, double max, double stepSize ) +{ + if ( axisValid( axisId ) ) + { + AxisData &d = *d_axisData[axisId]; + + d.doAutoScale = false; + d.scaleDiv.invalidate(); + + d.minValue = min; + d.maxValue = max; + d.stepSize = stepSize; + + autoRefresh(); + } +} + +/*! + \brief Disable autoscaling and specify a fixed scale for a selected axis. + \param axisId axis index + \param scaleDiv Scale division + \sa setAxisScale(), setAxisAutoScale() +*/ +void QwtPlot::setAxisScaleDiv( int axisId, const QwtScaleDiv &scaleDiv ) +{ + if ( axisValid( axisId ) ) + { + AxisData &d = *d_axisData[axisId]; + + d.doAutoScale = false; + d.scaleDiv = scaleDiv; + + autoRefresh(); + } +} + +/*! + \brief Set a scale draw + \param axisId axis index + \param scaleDraw object responsible for drawing scales. + + By passing scaleDraw it is possible to extend QwtScaleDraw + functionality and let it take place in QwtPlot. Please note + that scaleDraw has to be created with new and will be deleted + by the corresponding QwtScale member ( like a child object ). + + \sa QwtScaleDraw, QwtScaleWidget + \warning The attributes of scaleDraw will be overwritten by those of the + previous QwtScaleDraw. +*/ + +void QwtPlot::setAxisScaleDraw( int axisId, QwtScaleDraw *scaleDraw ) +{ + if ( axisValid( axisId ) ) + { + axisWidget( axisId )->setScaleDraw( scaleDraw ); + autoRefresh(); + } +} + +/*! + Change the alignment of the tick labels + \param axisId axis index + \param alignment Or'd Qt::AlignmentFlags see <qnamespace.h> + \sa QwtScaleDraw::setLabelAlignment() +*/ +void QwtPlot::setAxisLabelAlignment( int axisId, Qt::Alignment alignment ) +{ + if ( axisValid( axisId ) ) + axisWidget( axisId )->setLabelAlignment( alignment ); +} + +/*! + Rotate all tick labels + \param axisId axis index + \param rotation Angle in degrees. When changing the label rotation, + the label alignment might be adjusted too. + \sa QwtScaleDraw::setLabelRotation(), setAxisLabelAlignment() +*/ +void QwtPlot::setAxisLabelRotation( int axisId, double rotation ) +{ + if ( axisValid( axisId ) ) + axisWidget( axisId )->setLabelRotation( rotation ); +} + +/*! + Set the maximum number of minor scale intervals for a specified axis + + \param axisId axis index + \param maxMinor maximum number of minor steps + \sa axisMaxMinor() +*/ +void QwtPlot::setAxisMaxMinor( int axisId, int maxMinor ) +{ + if ( axisValid( axisId ) ) + { + maxMinor = qBound( 0, maxMinor, 100 ); + + AxisData &d = *d_axisData[axisId]; + if ( maxMinor != d.maxMinor ) + { + d.maxMinor = maxMinor; + d.scaleDiv.invalidate(); + autoRefresh(); + } + } +} + +/*! + Set the maximum number of major scale intervals for a specified axis + + \param axisId axis index + \param maxMajor maximum number of major steps + \sa axisMaxMajor() +*/ +void QwtPlot::setAxisMaxMajor( int axisId, int maxMajor ) +{ + if ( axisValid( axisId ) ) + { + maxMajor = qBound( 1, maxMajor, 10000 ); + + AxisData &d = *d_axisData[axisId]; + if ( maxMajor != d.maxMajor ) + { + d.maxMajor = maxMajor; + d.scaleDiv.invalidate(); + autoRefresh(); + } + } +} + +/*! + \brief Change the title of a specified axis + \param axisId axis index + \param title axis title +*/ +void QwtPlot::setAxisTitle( int axisId, const QString &title ) +{ + if ( axisValid( axisId ) ) + axisWidget( axisId )->setTitle( title ); +} + +/*! + \brief Change the title of a specified axis + \param axisId axis index + \param title axis title +*/ +void QwtPlot::setAxisTitle( int axisId, const QwtText &title ) +{ + if ( axisValid( axisId ) ) + axisWidget( axisId )->setTitle( title ); +} + +//! Rebuild the scales +void QwtPlot::updateAxes() +{ + // Find bounding interval of the item data + // for all axes, where autoscaling is enabled + + QwtInterval intv[axisCnt]; + + const QwtPlotItemList& itmList = itemList(); + + QwtPlotItemIterator it; + for ( it = itmList.begin(); it != itmList.end(); ++it ) + { + const QwtPlotItem *item = *it; + + if ( !item->testItemAttribute( QwtPlotItem::AutoScale ) ) + continue; + + if ( !item->isVisible() ) + continue; + + if ( axisAutoScale( item->xAxis() ) || axisAutoScale( item->yAxis() ) ) + { + const QRectF rect = item->boundingRect(); + intv[item->xAxis()] |= QwtInterval( rect.left(), rect.right() ); + intv[item->yAxis()] |= QwtInterval( rect.top(), rect.bottom() ); + } + } + + // Adjust scales + + for ( int axisId = 0; axisId < axisCnt; axisId++ ) + { + AxisData &d = *d_axisData[axisId]; + + double minValue = d.minValue; + double maxValue = d.maxValue; + double stepSize = d.stepSize; + + if ( d.doAutoScale && intv[axisId].isValid() ) + { + d.scaleDiv.invalidate(); + + minValue = intv[axisId].minValue(); + maxValue = intv[axisId].maxValue(); + + d.scaleEngine->autoScale( d.maxMajor, + minValue, maxValue, stepSize ); + } + if ( !d.scaleDiv.isValid() ) + { + d.scaleDiv = d.scaleEngine->divideScale( + minValue, maxValue, + d.maxMajor, d.maxMinor, stepSize ); + } + + QwtScaleWidget *scaleWidget = axisWidget( axisId ); + scaleWidget->setScaleDiv( + d.scaleEngine->transformation(), d.scaleDiv ); + + int startDist, endDist; + scaleWidget->getBorderDistHint( startDist, endDist ); + scaleWidget->setBorderDist( startDist, endDist ); + } + + for ( it = itmList.begin(); it != itmList.end(); ++it ) + { + QwtPlotItem *item = *it; + item->updateScaleDiv( *axisScaleDiv( item->xAxis() ), + *axisScaleDiv( item->yAxis() ) ); + } +} + |