arc_geom_manager.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2017-2021 Kicad Developers, see AUTHORS.txt for contributors.
 *
 * 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 <preview_items/arc_geom_manager.h>
 
#include <math/util.h> // for KiROUND
#include <geometry/eda_angle.h>
#include <trigo.h>
 
using namespace KIGFX::PREVIEW;
 
 
static EDA_ANGLE snapAngle( const EDA_ANGLE& aAngle )
{
 return ANGLE_45 * KiROUND( aAngle / ANGLE_45 );
}
 
 
bool ARC_GEOM_MANAGER::acceptPoint( const VECTOR2I& aPt )
{
 switch( getStep() )
 {
 case SET_ORIGIN: return setOrigin( aPt );
 case SET_START: return setStart( aPt );
 case SET_ANGLE: return setEnd( aPt );
 case COMPLETE: return false;
 }
 
 return false;
}
 
 
void ARC_GEOM_MANAGER::SetClockwise( bool aCw )
{
 m_clockwise = aCw;
 m_directionLocked = true;
 setGeometryChanged();
}
 
 
void ARC_GEOM_MANAGER::ToggleClockwise()
{
 m_clockwise = !m_clockwise;
 m_directionLocked = true;
 setGeometryChanged();
}
 
 
VECTOR2I ARC_GEOM_MANAGER::GetOrigin() const
{
 return m_origin;
}
 
 
VECTOR2I ARC_GEOM_MANAGER::GetStartRadiusEnd() const
{
 VECTOR2I vec( m_radius, 0 );
 RotatePoint( vec, -m_startAngle );
 return m_origin +vec;
}
 
 
VECTOR2I ARC_GEOM_MANAGER::GetEndRadiusEnd() const
{
 VECTOR2I vec( m_radius, 0 );
 RotatePoint( vec, -m_endAngle );
 return m_origin + vec;
}
 
 
double ARC_GEOM_MANAGER::GetRadius() const
{
 return m_radius;
}
 
 
EDA_ANGLE ARC_GEOM_MANAGER::GetStartAngle() const
{
 EDA_ANGLE angle = m_startAngle;
 
 if( m_clockwise )
 angle -= ANGLE_360;
 
 return -angle;
}
 
 
EDA_ANGLE ARC_GEOM_MANAGER::GetSubtended() const
{
 EDA_ANGLE angle = m_endAngle - m_startAngle;
 
 if( m_endAngle <= m_startAngle )
 angle += ANGLE_360;
 
 if( m_clockwise )
 angle -= ANGLE_360;
 
 return -angle;
}
 
 
bool ARC_GEOM_MANAGER::setOrigin( const VECTOR2I& aOrigin )
{
 m_origin = aOrigin;
 m_startAngle = ANGLE_0;
 m_endAngle = ANGLE_0;
 
 return true;
}
 
 
bool ARC_GEOM_MANAGER::setStart( const VECTOR2I& aEnd )
{
 const VECTOR2I radVec = aEnd - m_origin;
 
 m_radius = radVec.EuclideanNorm();
 m_startAngle = EDA_ANGLE( radVec );
 
 if( m_angleSnap )
 m_startAngle = snapAngle( m_startAngle );
 
 // normalise to 0..360
 while( m_startAngle < ANGLE_0 )
 m_startAngle += ANGLE_360;
 
 m_endAngle = m_startAngle;
 
 return m_radius != 0.0;
}
 
 
bool ARC_GEOM_MANAGER::setEnd( const VECTOR2I& aCursor )
{
 const VECTOR2I radVec = aCursor - m_origin;
 
 m_endAngle = EDA_ANGLE( radVec );
 
 if( m_angleSnap )
 m_endAngle = snapAngle( m_endAngle );
 
 // normalise to 0..360
 while( m_endAngle < ANGLE_0 )
 m_endAngle += ANGLE_360;
 
 if( !m_directionLocked )
 {
 EDA_ANGLE ccwAngle = m_endAngle - m_startAngle;
 
 if( m_endAngle <= m_startAngle )
 ccwAngle += ANGLE_360;
 
 EDA_ANGLE cwAngle = std::abs( ccwAngle - ANGLE_360 );
 
 if( std::min( ccwAngle, cwAngle ) >= ANGLE_90 )
 m_directionLocked = true;
 else
 m_clockwise = cwAngle < ccwAngle;
 }
 else if( std::abs( GetSubtended() ) < ANGLE_90 )
 {
 m_directionLocked = false;
 }
 
 // if the end is the same as the start, this is a bad point
 return m_endAngle != m_startAngle;
}