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