kicad/common/view/zoom_controller.cpp

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2012 Torsten Hueter, torstenhtr <at> gmx.de
* Copyright (C) 2013-2015 CERN
* Copyright (C) 2012-2019 KiCad Developers, see AUTHORS.txt for contributors.
*
* @author Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
* @author Maciej Suminski <maciej.suminski@cern.ch>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <view/zoom_controller.h>
#include <trace_helpers.h>
#include <wx/log.h>
#include <algorithm>
using namespace KIGFX;
/**
* A very simple timestamper that uses the #KIGFX::ACCELERATING_ZOOM_CONTROLLER::CLOCK
* to provide a timestamp. Since that's a steady_clock, it's monotonic.
*/
class SIMPLE_TIMESTAMPER : public ACCELERATING_ZOOM_CONTROLLER::TIMESTAMP_PROVIDER
{
public:
ACCELERATING_ZOOM_CONTROLLER::TIME_PT GetTimestamp() override
{
return ACCELERATING_ZOOM_CONTROLLER::CLOCK::now();
}
};
ACCELERATING_ZOOM_CONTROLLER::ACCELERATING_ZOOM_CONTROLLER(
double aScale, const TIMEOUT& aAccTimeout, TIMESTAMP_PROVIDER* aTimestampProv ) :
m_accTimeout( aAccTimeout ),
m_scale( aScale )
{
if( aTimestampProv )
{
m_timestampProv = aTimestampProv;
}
else
{
m_ownTimestampProv = std::make_unique<SIMPLE_TIMESTAMPER>();
m_timestampProv = m_ownTimestampProv.get();
}
m_prevTimestamp = m_timestampProv->GetTimestamp();
}
double ACCELERATING_ZOOM_CONTROLLER::GetScaleForRotation( int aRotation )
{
// The minimal step value when changing the current zoom level
const double minStep = 1.05;
const auto timestamp = m_timestampProv->GetTimestamp();
auto timeDiff = std::chrono::duration_cast<TIMEOUT>( timestamp - m_prevTimestamp );
m_prevTimestamp = timestamp;
wxLogTrace( traceZoomScroll,
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wxString::Format( "Rot %d, time diff: %ldms", aRotation, (long)timeDiff.count() ) );
double zoomScale;
// Set scaling speed depending on scroll wheel event interval
if( timeDiff < m_accTimeout
&& ( (aRotation > 0) == m_prevRotationPositive ) )
{
zoomScale = ( 2.05 * m_scale / 5.0 ) - timeDiff / m_accTimeout;
// be sure zoomScale value is significant
zoomScale = std::max( zoomScale, minStep );
if( aRotation < 0 )
zoomScale = 1.0 / zoomScale;
}
else
{
zoomScale = ( aRotation > 0 ) ? minStep : 1 / minStep;
}
m_prevRotationPositive = aRotation > 0;
wxLogTrace( traceZoomScroll, wxString::Format( " Zoom factor: %f", zoomScale ) );
return zoomScale;
}
CONSTANT_ZOOM_CONTROLLER::CONSTANT_ZOOM_CONTROLLER( double aScale ) : m_scale( aScale )
{
}
double CONSTANT_ZOOM_CONTROLLER::GetScaleForRotation( int aRotation )
{
wxLogTrace( traceZoomScroll, wxString::Format( "Rot %d", aRotation ) );
aRotation = ( aRotation > 0 ) ? std::min( aRotation, 100 ) : std::max( aRotation, -100 );
double dscale = aRotation * m_scale;
double zoom_scale = ( aRotation > 0 ) ? ( 1 + dscale ) : 1 / ( 1 - dscale );
wxLogTrace( traceZoomScroll, wxString::Format( " Zoom factor: %f", zoom_scale ) );
return zoom_scale;
}
// need these until C++17
constexpr ACCELERATING_ZOOM_CONTROLLER::TIMEOUT ACCELERATING_ZOOM_CONTROLLER::DEFAULT_TIMEOUT;
constexpr double CONSTANT_ZOOM_CONTROLLER::MAC_SCALE;
constexpr double CONSTANT_ZOOM_CONTROLLER::GTK3_SCALE;
constexpr double CONSTANT_ZOOM_CONTROLLER::MSW_SCALE;