SHAPE_LINE_CHAIN PNS_MEANDER_SHAPE::circleQuad( VECTOR2D aP, VECTOR2D aDir, bool aSide )
{
SHAPE_LINE_CHAIN lc;
if( aDir.EuclideanNorm( ) == 0.0f )
{
lc.Append( aP );
return lc;
}
VECTOR2D dir_u( aDir );
VECTOR2D dir_v( aDir.Perpendicular( ) );
const int ArcSegments = Settings().m_cornerArcSegments;
for( int i = ArcSegments - 1; i >= 0; i-- )
{
VECTOR2D p;
double alpha = (double) i / (double) ( ArcSegments - 1 ) * M_PI / 2.0;
p = aP + dir_u * cos( alpha ) + dir_v * ( aSide ? -1.0 : 1.0 ) * ( 1.0 - sin( alpha ) );
lc.Append( ( int ) p.x, ( int ) p.y );
}
return lc;
}
SHAPE_LINE_CHAIN PNS_MEANDER_SHAPE::circleQuad( VECTOR2D aP, VECTOR2D aDir, bool aSide )
{
SHAPE_LINE_CHAIN lc;
if( aDir.EuclideanNorm( ) == 0.0f )
{
lc.Append( aP );
return lc;
}
VECTOR2D dir_u( aDir );
VECTOR2D dir_v( aDir.Perpendicular( ) );
const int ArcSegments = Settings().m_cornerArcSegments;
double radius = (double) aDir.EuclideanNorm();
double angleStep = M_PI / 2.0 / (double) ArcSegments;
double correction = 12.0 * radius * ( 1.0 - cos( angleStep / 2.0 ) );
if( !m_dual )
correction = 0.0;
else if( radius < m_meanCornerRadius )
correction = 0.0;
VECTOR2D p = aP;
lc.Append( ( int ) p.x, ( int ) p.y );
VECTOR2D dir_uu = dir_u.Resize( radius - correction );
VECTOR2D dir_vv = dir_v.Resize( radius - correction );
VECTOR2D shift = dir_u.Resize( correction );
for( int i = ArcSegments - 1; i >= 0; i-- )
{
double alpha = (double) i / (double) ( ArcSegments - 1 ) * M_PI / 2.0;
p = aP + shift + dir_uu * cos( alpha ) + dir_vv * ( aSide ? -1.0 : 1.0 ) * ( 1.0 - sin( alpha ) );
lc.Append( ( int ) p.x, ( int ) p.y );
}
p = aP + dir_u + dir_v * ( aSide ? -1.0 : 1.0 );
lc.Append( ( int ) p.x, ( int ) p.y );
return lc;
}