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#5150 Improve wheel zoom with logarithmic axes

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* Limit the amount to scroll at one time and set a fixed minimum
This commit is contained in:
Gaute Lindkvist
2019-11-30 12:08:42 +01:00
parent 538e42f278
commit 4870071b8e
5 changed files with 70 additions and 6 deletions
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41
ApplicationCode/UserInterface/RiuQwtPlotWheelZoomer.cpp
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@@ -17,10 +17,15 @@
/////////////////////////////////////////////////////////////////////////////////
#include "RiuQwtPlotWheelZoomer.h"
#include "cvfMath.h"
#include "qwt_plot.h"
#include "qwt_scale_div.h"
#include <QEvent>
#include <QWheelEvent>
#define RIU_LOGARITHMIC_MINIMUM 1.0e-15
#define RIU_SCROLLWHEEL_ZOOMFACTOR 1.1
#define RIU_SCROLLWHEEL_PANFACTOR 0.1
@@ -37,15 +42,41 @@ RiuQwtPlotWheelZoomer::RiuQwtPlotWheelZoomer( QwtPlot* plot )
//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void zoomOnAxis( QwtPlot* plot, QwtPlot::Axis axis, double zoomFactor, int eventPos )
void RiuQwtPlotWheelZoomer::zoomOnAxis( QwtPlot* plot, QwtPlot::Axis axis, double zoomFactor, int eventPos )
{
QwtScaleMap scaleMap = plot->canvasMap( axis );
double zoomCenter = scaleMap.invTransform( eventPos );
double newMin = zoomCenter - zoomFactor * ( zoomCenter - scaleMap.s1() );
double newMax = zoomCenter + zoomFactor * ( -zoomCenter + scaleMap.s2() );
// the QwtScaleDiv::interval yields the current axis range
// The following thus doesn't limit the zoom to the min/max data but
// Stops the zoom from changing too much in one step
QwtInterval axisRange = plot->axisScaleDiv( axis ).interval();
if ( axisIsLogarithmic( axis ) )
{
// Handle inverted axes as well by not assuming maxValue > minValue
double minValue = std::max( RIU_LOGARITHMIC_MINIMUM,
0.1 * std::min( axisRange.minValue(), axisRange.maxValue() ) );
double maxValue = std::max( RIU_LOGARITHMIC_MINIMUM,
10.0 * std::max( axisRange.minValue(), axisRange.maxValue() ) );
newMin = cvf::Math::clamp( newMin, minValue, maxValue );
newMax = cvf::Math::clamp( newMax, minValue, maxValue );
}
plot->setAxisScale( axis, newMin, newMax );
}
//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
bool RiuQwtPlotWheelZoomer::axisIsLogarithmic( QwtPlot::Axis axis ) const
{
auto it = m_axesAreLogarithmic.find( axis );
return it != m_axesAreLogarithmic.end() ? it->second : false;
}
//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
@@ -71,3 +102,11 @@ bool RiuQwtPlotWheelZoomer::eventFilter( QObject* watched, QEvent* event )
return false;
}
//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RiuQwtPlotWheelZoomer::setAxisIsLogarithmic( QwtPlot::Axis axis, bool logarithmic )
{
m_axesAreLogarithmic[axis] = logarithmic;
}