182 lines
4.0 KiB
C++
182 lines
4.0 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) 2017 Kicad Developers, see AUTHORS.txt for contributors.
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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 <preview_items/arc_geom_manager.h>
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#include <math/util.h> // for KiROUND
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using namespace KIGFX::PREVIEW;
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///> Snap an angle to the nearest 45 degrees
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static double snapAngle( double aAngle )
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{
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return KiROUND( aAngle / M_PI_4 ) * M_PI_4;
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}
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bool ARC_GEOM_MANAGER::acceptPoint( const VECTOR2I& aPt )
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{
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switch( getStep() )
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{
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case SET_ORIGIN: return setOrigin( aPt );
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case SET_START: return setStart( aPt );
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case SET_ANGLE: return setEnd( aPt );
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case COMPLETE: return false;
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}
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return false;
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}
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void ARC_GEOM_MANAGER::SetClockwise( bool aCw )
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{
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m_clockwise = aCw;
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m_directionLocked = true;
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setGeometryChanged();
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}
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void ARC_GEOM_MANAGER::ToggleClockwise()
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{
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m_clockwise = !m_clockwise;
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m_directionLocked = true;
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setGeometryChanged();
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}
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VECTOR2I ARC_GEOM_MANAGER::GetOrigin() const
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{
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return m_origin;
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}
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VECTOR2I ARC_GEOM_MANAGER::GetStartRadiusEnd() const
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{
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return m_origin + VECTOR2I( m_radius, 0 ).Rotate( m_startAngle );
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}
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VECTOR2I ARC_GEOM_MANAGER::GetEndRadiusEnd() const
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{
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return m_origin + VECTOR2I( m_radius, 0 ).Rotate( m_endAngle );
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}
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double ARC_GEOM_MANAGER::GetRadius() const
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{
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return m_radius;
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}
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double ARC_GEOM_MANAGER::GetStartAngle() const
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{
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double angle = m_startAngle;
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if( m_clockwise )
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angle -= 2 * M_PI;
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return -angle;
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}
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double ARC_GEOM_MANAGER::GetSubtended() const
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{
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double angle = m_endAngle - m_startAngle;
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if( m_endAngle <= m_startAngle )
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angle += 2 * M_PI;
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if( m_clockwise )
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angle -= 2 * M_PI;
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return -angle;
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}
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bool ARC_GEOM_MANAGER::setOrigin( const VECTOR2I& aOrigin )
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{
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m_origin = aOrigin;
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m_startAngle = 0.0;
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m_endAngle = 0.0;
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return true;
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}
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bool ARC_GEOM_MANAGER::setStart( const VECTOR2I& aEnd )
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{
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const VECTOR2I radVec = aEnd - m_origin;
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m_radius = radVec.EuclideanNorm();
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m_startAngle = radVec.Angle();
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if( m_angleSnap )
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m_startAngle = snapAngle( m_startAngle );
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// normalise into 0-2Pi
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while( m_startAngle < 0 )
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m_startAngle += M_PI * 2;
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m_endAngle = m_startAngle;
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return m_radius != 0.0;
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}
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bool ARC_GEOM_MANAGER::setEnd( const VECTOR2I& aCursor )
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{
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const VECTOR2I radVec = aCursor - m_origin;
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m_endAngle = radVec.Angle();
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if( m_angleSnap )
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m_endAngle = snapAngle( m_endAngle );
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// normalise into 0-2Pi
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while( m_endAngle < 0 )
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m_endAngle += M_PI * 2;
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if( !m_directionLocked )
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{
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double ccwAngle = m_endAngle - m_startAngle;
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if( m_endAngle <= m_startAngle )
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ccwAngle += 2 * M_PI;
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double cwAngle = std::abs( ccwAngle - 2 * M_PI );
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if( std::min( ccwAngle, cwAngle ) >= M_PI_2 )
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m_directionLocked = true;
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else
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m_clockwise = cwAngle < ccwAngle;
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}
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else if( std::abs( GetSubtended() ) < M_PI_2 )
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{
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m_directionLocked = false;
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}
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// if the end is the same as the start, this is a bad point
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return m_endAngle != m_startAngle;
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}
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