qwt_plot_panner.cpp
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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_panner.h"
#include "qwt_scale_div.h"
#include "qwt_plot.h"
#include "qwt_plot_canvas.h"
class QwtPlotPanner::PrivateData
{
public:
PrivateData()
{
for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )
isAxisEnabled[axis] = true;
}
bool isAxisEnabled[QwtPlot::axisCnt];
};
/*!
\brief Create a plot panner
The panner is enabled for all axes
\param canvas Plot canvas to pan, also the parent object
\sa setAxisEnabled()
*/
QwtPlotPanner::QwtPlotPanner( QwtPlotCanvas *canvas ):
QwtPanner( canvas )
{
d_data = new PrivateData();
connect( this, SIGNAL( panned( int, int ) ),
SLOT( moveCanvas( int, int ) ) );
}
//! Destructor
QwtPlotPanner::~QwtPlotPanner()
{
delete d_data;
}
/*!
\brief En/Disable an axis
Axes that are enabled will be synchronized to the
result of panning. All other axes will remain unchanged.
\param axis Axis, see QwtPlot::Axis
\param on On/Off
\sa isAxisEnabled(), moveCanvas()
*/
void QwtPlotPanner::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(), moveCanvas()
*/
bool QwtPlotPanner::isAxisEnabled( int axis ) const
{
if ( axis >= 0 && axis < QwtPlot::axisCnt )
return d_data->isAxisEnabled[axis];
return true;
}
//! Return observed plot canvas
QwtPlotCanvas *QwtPlotPanner::canvas()
{
return qobject_cast<QwtPlotCanvas *>( parentWidget() );
}
//! Return Observed plot canvas
const QwtPlotCanvas *QwtPlotPanner::canvas() const
{
return qobject_cast<const QwtPlotCanvas *>( parentWidget() );
}
//! Return plot widget, containing the observed plot canvas
QwtPlot *QwtPlotPanner::plot()
{
QwtPlotCanvas *w = canvas();
if ( w )
return w->plot();
return NULL;
}
//! Return plot widget, containing the observed plot canvas
const QwtPlot *QwtPlotPanner::plot() const
{
const QwtPlotCanvas *w = canvas();
if ( w )
return w->plot();
return NULL;
}
/*!
Adjust the enabled axes according to dx/dy
\param dx Pixel offset in x direction
\param dy Pixel offset in y direction
\sa QwtPanner::panned()
*/
void QwtPlotPanner::moveCanvas( int dx, int dy )
{
if ( dx == 0 && dy == 0 )
return;
QwtPlot *plot = this->plot();
if ( plot == NULL )
return;
const bool doAutoReplot = plot->autoReplot();
plot->setAutoReplot( false );
for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )
{
if ( !d_data->isAxisEnabled[axis] )
continue;
const QwtScaleMap map = plot->canvasMap( axis );
const double p1 = map.transform( plot->axisScaleDiv( axis )->lowerBound() );
const double p2 = map.transform( plot->axisScaleDiv( axis )->upperBound() );
double d1, d2;
if ( axis == QwtPlot::xBottom || axis == QwtPlot::xTop )
{
d1 = map.invTransform( p1 - dx );
d2 = map.invTransform( p2 - dx );
}
else
{
d1 = map.invTransform( p1 - dy );
d2 = map.invTransform( p2 - dy );
}
plot->setAxisScale( axis, d1, d2 );
}
plot->setAutoReplot( doAutoReplot );
plot->replot();
}
/*!
Calculate a mask from the border mask of the canvas
\sa QwtPlotCanvas::borderMask()
*/
QBitmap QwtPlotPanner::contentsMask() const
{
if ( canvas() )
return canvas()->borderMask( size() );
return QwtPanner::contentsMask();
}