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https://github.com/OPM/ResInsight.git
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117 lines
4.5 KiB
C++
117 lines
4.5 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 "caf.h"
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#include "qwt_interval.h"
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#include "qwt_plot.h"
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#include "qwt_scale_div.h"
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#include "qwt_scale_map.h"
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#include <QEvent>
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#include <QWheelEvent>
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#include <algorithm>
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#define RIU_LOGARITHMIC_MINIMUM 1.0e-15
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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 RiuQwtPlotWheelZoomer::zoomOnAxis( QwtPlot* plot, QwtAxis::Position 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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// the QwtScaleDiv::interval yields the current axis range
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// The following thus doesn't limit the zoom to the min/max data but
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// Stops the zoom from changing too much in one step
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QwtInterval axisRange = plot->axisScaleDiv( axis ).interval();
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if ( axisIsLogarithmic( axis ) )
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{
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// Handle inverted axes as well by not assuming maxValue > minValue
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double minValue = std::max( RIU_LOGARITHMIC_MINIMUM, 0.1 * std::min( axisRange.minValue(), axisRange.maxValue() ) );
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double maxValue = std::max( RIU_LOGARITHMIC_MINIMUM, 10.0 * std::max( axisRange.minValue(), axisRange.maxValue() ) );
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newMin = std::clamp( newMin, minValue, maxValue );
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newMax = std::clamp( newMax, minValue, maxValue );
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}
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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::axisIsLogarithmic( QwtAxis::Position axis ) const
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{
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auto it = m_axesAreLogarithmic.find( axis );
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return it != m_axesAreLogarithmic.end() ? it->second : false;
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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->angleDelta().y() > 0 )
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{
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zoomFactor = RIU_SCROLLWHEEL_ZOOMFACTOR;
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}
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auto position = caf::position( wheelEvent );
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zoomOnAxis( m_plot, QwtAxis::XBottom, zoomFactor, position.x() );
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zoomOnAxis( m_plot, QwtAxis::XTop, zoomFactor, position.x() );
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zoomOnAxis( m_plot, QwtAxis::YLeft, zoomFactor, position.y() );
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zoomOnAxis( m_plot, QwtAxis::YRight, zoomFactor, position.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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//--------------------------------------------------------------------------------------------------
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///
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//--------------------------------------------------------------------------------------------------
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void RiuQwtPlotWheelZoomer::setAxisIsLogarithmic( QwtAxis::Position axis, bool logarithmic )
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{
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m_axesAreLogarithmic[axis] = logarithmic;
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}
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