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Revert "geometry: revert SHAPE_LINE_CHAIN::PointInside/PointOnEdge() optimizations so that it's consistent with other collision checking methods (i.e. SEG::Distance() )" 

This reverts commit 4a0fba309a.
This commit is contained in:
Seth Hillbrand 2019-01-29 06:35:30 -08:00
parent 05483a06c6
commit 93ecd44f5a
1 changed files with 33 additions and 21 deletions
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54
common/geometry/shape_line_chain.cpp
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@ -350,46 +350,58 @@ int SHAPE_LINE_CHAIN::PathLength( const VECTOR2I& aP ) const
bool SHAPE_LINE_CHAIN::PointInside( const VECTOR2I& aP ) const bool SHAPE_LINE_CHAIN::PointInside( const VECTOR2I& aP ) const
{ {
if( !m_closed || SegmentCount() < 3 ) if( !m_closed || PointCount() < 3 || !BBox().Contains( aP ) )
return false; return false;
int cur = CSegment( 0 ).Side( aP ); bool inside = false;
if( cur == 0 ) /**
return false; * To check for interior points, we draw a line in the positive x direction from
* the point. If it intersects an even number of segments, the point is outside the
for( int i = 1; i < SegmentCount(); i++ ) * line chain (it had to first enter and then exit). Otherwise, it is inside the chain.
*
* Note: slope might be denormal here in the case of a horizontal line but we require our
* y to move from above to below the point (or vice versa)
*/
for( int i = 0; i < PointCount(); i++ )
{ {
const SEG s = CSegment( i ); const VECTOR2D p1 = CPoint( i );
const VECTOR2D p2 = CPoint( i + 1 ); // CPoint wraps, so ignore counts
const VECTOR2D diff = p2 - p1;
// if( aP == s.A || aP == s.B ) // edge does not belong to the interior! if( ( ( p1.y > aP.y ) != ( p2.y > aP.y ) ) &&
// return false; ( aP.x - p1.x < ( diff.x / diff.y ) * ( aP.y - p1.y ) ) )
inside = !inside;
if( s.Side( aP ) != cur )
return false;
} }
return true; return inside;
} }
bool SHAPE_LINE_CHAIN::PointOnEdge( const VECTOR2I& aP ) const bool SHAPE_LINE_CHAIN::PointOnEdge( const VECTOR2I& aP ) const
{ {
if( !PointCount() ) if( !PointCount() )
return false; return false;
else if( PointCount() == 1 )
else if( PointCount() == 1 )
return m_points[0] == aP; return m_points[0] == aP;
for( int i = 0; i < SegmentCount(); i++ ) for( int i = 0; i < PointCount(); i++ )
{ {
const SEG s = CSegment( i ); const VECTOR2I& p1 = CPoint( i );
const VECTOR2I& p2 = CPoint( i + 1 );
if( s.A == aP || s.B == aP ) if( aP == p1 )
return true; return true;
if( s.Distance( aP ) <= 1 ) if( p1.x == p2.x && p1.x == aP.x && ( p1.y > aP.y ) != ( p2.y > aP.y ) )
return true; return true;
const VECTOR2D diff = p2 - p1;
if( aP.x >= p1.x && aP.x <= p2.x )
{
if( round_nearest( p1.y + ( diff.y / diff.x ) * ( aP.x - p1.x ) ) == aP.y )
return true;
}
} }
return false; return false;