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/* -*- 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_plot_canvas.h"
#include "qwt_scale_div.h"
#include "qwt_plot_magnifier.h"
#include <qevent.h>
class QwtPlotMagnifier::PrivateData
{
public:
PrivateData()
{
for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )
isAxisEnabled[axis] = true;
}
bool isAxisEnabled[QwtPlot::axisCnt];
};
/*!
Constructor
\param canvas Plot canvas to be magnified
*/
QwtPlotMagnifier::QwtPlotMagnifier( QwtPlotCanvas *canvas ):
QwtMagnifier( canvas )
{
d_data = new PrivateData();
}
//! Destructor
QwtPlotMagnifier::~QwtPlotMagnifier()
{
delete d_data;
}
/*!
\brief En/Disable an axis
Only Axes that are enabled will be zoomed.
All other axes will remain unchanged.
\param axis Axis, see QwtPlot::Axis
\param on On/Off
\sa isAxisEnabled()
*/
void QwtPlotMagnifier::setAxisEnabled( int axis, bool on )
{
if ( axis >= 0 && axis < QwtPlot::axisCnt )
d_data->isAxisEnabled[axis] = on;
}
/*!
Test if an axis is enabled
\param axis Axis, see QwtPlot::Axis
\return True, if the axis is enabled
\sa setAxisEnabled()
*/
bool QwtPlotMagnifier::isAxisEnabled( int axis ) const
{
if ( axis >= 0 && axis < QwtPlot::axisCnt )
return d_data->isAxisEnabled[axis];
return true;
}
//! Return observed plot canvas
QwtPlotCanvas *QwtPlotMagnifier::canvas()
{
return qobject_cast<QwtPlotCanvas *>( parent() );
}
//! Return Observed plot canvas
const QwtPlotCanvas *QwtPlotMagnifier::canvas() const
{
return qobject_cast<const QwtPlotCanvas *>( parent() );
}
//! Return plot widget, containing the observed plot canvas
QwtPlot *QwtPlotMagnifier::plot()
{
QwtPlotCanvas *w = canvas();
if ( w )
return w->plot();
return NULL;
}
//! Return plot widget, containing the observed plot canvas
const QwtPlot *QwtPlotMagnifier::plot() const
{
const QwtPlotCanvas *w = canvas();
if ( w )
return w->plot();
return NULL;
}
/*!
Zoom in/out the axes scales
\param factor A value < 1.0 zooms in, a value > 1.0 zooms out.
*/
void QwtPlotMagnifier::rescale( double factor )
{
factor = qAbs( factor );
if ( factor == 1.0 || factor == 0.0 )
return;
bool doReplot = false;
QwtPlot* plt = plot();
const bool autoReplot = plt->autoReplot();
plt->setAutoReplot( false );
for ( int axisId = 0; axisId < QwtPlot::axisCnt; axisId++ )
{
const QwtScaleDiv *scaleDiv = plt->axisScaleDiv( axisId );
if ( isAxisEnabled( axisId ) && scaleDiv->isValid() )
{
const double center =
scaleDiv->lowerBound() + scaleDiv->range() / 2;
const double width_2 = scaleDiv->range() / 2 * factor;
plt->setAxisScale( axisId, center - width_2, center + width_2 );
doReplot = true;
}
}
plt->setAutoReplot( autoReplot );
if ( doReplot )
plt->replot();
}
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