mirror of
https://github.com/OPM/ResInsight.git
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74 lines
2.8 KiB
C++
74 lines
2.8 KiB
C++
/////////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2017- Statoil ASA
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//
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// ResInsight is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// ResInsight is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE.
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//
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// See the GNU General Public License at <http://www.gnu.org/licenses/gpl.html>
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// for more details.
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//
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/////////////////////////////////////////////////////////////////////////////////
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#include "RiuQwtPlotWheelZoomer.h"
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#include "qwt_plot.h"
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#include <QEvent>
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#include <QWheelEvent>
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#define RIU_SCROLLWHEEL_ZOOMFACTOR 1.1
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#define RIU_SCROLLWHEEL_PANFACTOR 0.1
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//--------------------------------------------------------------------------------------------------
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///
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//--------------------------------------------------------------------------------------------------
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RiuQwtPlotWheelZoomer::RiuQwtPlotWheelZoomer( QwtPlot* plot )
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: QObject( plot )
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, m_plot( plot )
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{
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plot->canvas()->installEventFilter( this );
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}
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//--------------------------------------------------------------------------------------------------
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///
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//--------------------------------------------------------------------------------------------------
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void zoomOnAxis( QwtPlot* plot, QwtPlot::Axis axis, double zoomFactor, int eventPos )
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{
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QwtScaleMap scaleMap = plot->canvasMap( axis );
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double zoomCenter = scaleMap.invTransform( eventPos );
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double newMin = zoomCenter - zoomFactor * ( zoomCenter - scaleMap.s1() );
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double newMax = zoomCenter + zoomFactor * ( -zoomCenter + scaleMap.s2() );
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plot->setAxisScale( axis, newMin, newMax );
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}
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//--------------------------------------------------------------------------------------------------
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///
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//--------------------------------------------------------------------------------------------------
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bool RiuQwtPlotWheelZoomer::eventFilter( QObject* watched, QEvent* event )
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{
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QWheelEvent* wheelEvent = dynamic_cast<QWheelEvent*>( event );
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if ( wheelEvent )
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{
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double zoomFactor = 1.0 / RIU_SCROLLWHEEL_ZOOMFACTOR;
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if ( wheelEvent->delta() > 0 )
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{
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zoomFactor = RIU_SCROLLWHEEL_ZOOMFACTOR;
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}
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zoomOnAxis( m_plot, QwtPlot::xBottom, zoomFactor, wheelEvent->pos().x() );
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zoomOnAxis( m_plot, QwtPlot::xTop, zoomFactor, wheelEvent->pos().x() );
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zoomOnAxis( m_plot, QwtPlot::yLeft, zoomFactor, wheelEvent->pos().y() );
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zoomOnAxis( m_plot, QwtPlot::yRight, zoomFactor, wheelEvent->pos().y() );
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m_plot->replot();
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emit zoomUpdated();
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}
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return false;
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}
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