kicad/common/preview_items/polygon_geom_manager.cpp

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/*
* This program source code file is part of KICAD, a free EDA CAD application.
*
* Copyright (C) 2017-2020 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 <limits>
#include <vector>
#include <preview_items/polygon_geom_manager.h>
#include <geometry/geometry_utils.h>
#include <geometry/shape_line_chain.h>
POLYGON_GEOM_MANAGER::POLYGON_GEOM_MANAGER( CLIENT& aClient ):
m_client( aClient ),
m_leaderMode( LEADER_MODE::DIRECT ),
m_intersectionsAllowed( true )
{}
bool POLYGON_GEOM_MANAGER::AddPoint( const VECTOR2I& aPt )
{
// if this is the first point, make sure the client is happy
// for us to continue
if( !IsPolygonInProgress() && !m_client.OnFirstPoint( *this ) )
return false;
if( m_leaderPts.PointCount() > 1 )
{
// there are enough leader points - the next
// locked-in point is the end of the first leader
// segment
m_lockedPoints.Append( m_leaderPts.CPoint( 1 ) );
}
else
{
// no leader lines, directly add the cursor
m_lockedPoints.Append( aPt );
}
// check for self-intersections
if( !m_intersectionsAllowed && IsSelfIntersecting( false ) )
{
m_lockedPoints.Remove( m_lockedPoints.PointCount() - 1 );
return false;
}
m_client.OnGeometryChange( *this );
return true;
}
void POLYGON_GEOM_MANAGER::SetFinished()
{
m_client.OnComplete( *this );
}
void POLYGON_GEOM_MANAGER::SetLeaderMode( LEADER_MODE aMode )
{
m_leaderMode = aMode;
}
bool POLYGON_GEOM_MANAGER::IsSelfIntersecting( bool aIncludeLeaderPts ) const
{
SHAPE_LINE_CHAIN pts( m_lockedPoints );
if( aIncludeLeaderPts )
{
for( int i = 0; i < m_leaderPts.PointCount(); ++i )
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{
if( m_leaderPts.CPoint( i ) != pts.CPoint( 0 ) )
pts.Append( m_leaderPts.CPoint( i ) );
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}
}
// line chain needs to be set as closed for proper checks
pts.SetClosed( true );
return !!pts.SelfIntersecting();
}
void POLYGON_GEOM_MANAGER::SetCursorPosition( const VECTOR2I& aPos )
{
updateLeaderPoints( aPos );
}
bool POLYGON_GEOM_MANAGER::IsPolygonInProgress() const
{
return m_lockedPoints.PointCount() > 0;
}
bool POLYGON_GEOM_MANAGER::NewPointClosesOutline( const VECTOR2I& aPt ) const
{
return m_lockedPoints.PointCount() > 0 && m_lockedPoints.CPoint( 0 ) == aPt;
}
void POLYGON_GEOM_MANAGER::DeleteLastCorner()
{
if( m_lockedPoints.PointCount() > 0 )
m_lockedPoints.Remove( m_lockedPoints.PointCount() - 1 );
// update the new last segment (was previously
// locked in), reusing last constraints
if( m_lockedPoints.PointCount() > 0 )
updateLeaderPoints( m_leaderPts.CLastPoint() );
m_client.OnGeometryChange( *this );
}
void POLYGON_GEOM_MANAGER::Reset()
{
m_lockedPoints.Clear();
m_leaderPts.Clear();
m_client.OnGeometryChange( *this );
}
void POLYGON_GEOM_MANAGER::updateLeaderPoints( const VECTOR2I& aEndPoint, LEADER_MODE aModifier )
{
wxCHECK( m_lockedPoints.PointCount() > 0, /*void*/ );
const VECTOR2I& last_pt = m_lockedPoints.CLastPoint();
if( m_leaderMode == LEADER_MODE::DEG45 || aModifier == LEADER_MODE::DEG45 )
{
const VECTOR2I line_vec( aEndPoint - last_pt );
// get a restricted 45/H/V line from the last fixed point to the cursor
auto new_end = last_pt + GetVectorSnapped45( line_vec );
OPT_VECTOR2I pt = boost::make_optional( false, VECTOR2I() );
if( m_lockedPoints.SegmentCount() > 1 )
{
const VECTOR2I& start_pt = m_lockedPoints.CPoint( 0 );
VECTOR2I completed_vec( start_pt - new_end );
if( completed_vec != GetVectorSnapped45( completed_vec ) )
{
SEG v_first( new_end, VECTOR2I( new_end.x, start_pt.y ) );
SEG h_first( new_end, VECTOR2I( start_pt.x, new_end.y ) );
SHAPE_LINE_CHAIN::INTERSECTIONS intersections;
auto v_hits = m_lockedPoints.Intersect( v_first, intersections );
v_hits += m_lockedPoints.Intersect( SEG( v_first.B, start_pt ), intersections );
pt = v_first.B;
if( v_hits > 0 )
{
intersections.clear();
auto h_hits = m_lockedPoints.Intersect( h_first, intersections );
h_hits += m_lockedPoints.Intersect( SEG( h_first.B, start_pt ), intersections );
if( h_hits < v_hits )
pt = h_first.B;
}
}
}
m_leaderPts = SHAPE_LINE_CHAIN( { last_pt, new_end } );
if( pt )
{
SEG drawn( last_pt, new_end );
SEG completed( new_end, *pt );
/*
* Check for backtracking from the point to intersection. If the snapped path to
* completion is shorter than what the user actually drew, we want to discard the
* drawn point and just use the snapped completion point.
*/
if( drawn.Collinear( completed ) && drawn.SquaredLength() > completed.SquaredLength() )
m_leaderPts = SHAPE_LINE_CHAIN( { last_pt, *pt } );
else
m_leaderPts.Append( *pt );
}
}
else
{
// direct segment
m_leaderPts = SHAPE_LINE_CHAIN( { last_pt, aEndPoint } );
}
m_client.OnGeometryChange( *this );
}