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kicad/utils/kicad2step/pcb/kicadcurve.cpp

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2016 Cirilo Bernardo <cirilo.bernardo@gmail.com>
* Copyright (C) 2022 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 "kicadcurve.h"
#include <sexpr/sexpr.h>
#include <wx/log.h>
#include <cmath>
#include <iostream>
#include <sstream>
#include <../../../libs/kimath/include/geometry/shape_arc.h>
#include <sexpr/sexpr_parser.h>
#include <geometry/shape_line_chain.h>
KICADCURVE::KICADCURVE()
{
m_form = CURVE_NONE;
m_angle = 0.0;
m_radius = 0.0;
m_layer = LAYER_NONE;
m_startangle = 0.0;
m_endangle = 0.0;
m_arcHasMiddlePoint = false;
return;
}
KICADCURVE::~KICADCURVE()
{
return;
}
bool KICADCURVE::Read( SEXPR::SEXPR* aEntry, CURVE_TYPE aCurveType )
{
if( CURVE_LINE != aCurveType && CURVE_ARC != aCurveType
&& CURVE_CIRCLE != aCurveType && CURVE_BEZIER != aCurveType
&& CURVE_POLYGON != aCurveType )
{
wxLogMessage( wxT( "* Unsupported curve type: %d\n" ), aCurveType );
return false;
}
m_form = aCurveType;
int nchild = aEntry->GetNumberOfChildren();
if( ( CURVE_CIRCLE == aCurveType && nchild < 5 )
|| ( CURVE_ARC == aCurveType && nchild < 6 )
|| ( CURVE_LINE == aCurveType && nchild < 5 )
|| ( CURVE_BEZIER == aCurveType && nchild < 5 )
|| ( CURVE_POLYGON == aCurveType && nchild < 5 ) )
{
wxLogMessage( wxT( "* bad curve data; not enough parameters\n" ) );
return false;
}
SEXPR::SEXPR* child;
std::string text;
for( int i = 1; i < nchild; ++i )
{
child = aEntry->GetChild( i );
if( !child->IsList() )
continue;
text = child->GetChild( 0 )->GetSymbol();
if( text == "pts" )
{
// Parse and extract the list of xy coordinates
SEXPR::PARSER parser;
std::unique_ptr<SEXPR::SEXPR> prms = parser.Parse( child->AsString() );
// We need 4 XY parameters (and "pts" that is the first parameter)
if( ( aCurveType == CURVE_BEZIER && prms->GetNumberOfChildren() != 5 )
|| ( aCurveType == CURVE_POLYGON && prms->GetNumberOfChildren() < 4 ) )
return false;
// Extract xy coordinates from pts list
SEXPR::SEXPR_VECTOR const* list = prms->GetChildren();
// The first parameter is "pts", so skip it.
for( SEXPR::SEXPR_VECTOR::size_type ii = 1; ii < list->size(); ++ii )
{
SEXPR::SEXPR* sub_child = ( *list )[ii];
text = sub_child->GetChild( 0 )->GetSymbol();
// inside pts list, parameters are xy point coord
// or a arc (start, middle, end) points
if( text == "xy" )
{
DOUBLET coord;
if( !Get2DCoordinate( sub_child, coord ) )
return false;
if( aCurveType == CURVE_BEZIER )
{
switch( ii )
{
case 1: m_start = coord; break;
case 2: m_bezierctrl1 = coord; break;
case 3: m_bezierctrl2 = coord; break;
case 4: m_end = coord; break;
default:
break;
}
}
else
{
m_poly.push_back( coord );
}
}
else if( text == "arc" )
{
int arc_child = sub_child->GetNumberOfChildren();
DOUBLET arc_start, arc_middle, arc_end;
for( int jj = 1; jj < arc_child; jj++ )
{
SEXPR::SEXPR* curr_child = sub_child->GetChild( jj );
text = curr_child->GetChild( 0 )->GetSymbol();
if( text == "start" )
{
if( !Get2DCoordinate( curr_child, arc_start ) )
return false;
}
else if( text == "end" )
{
if( !Get2DCoordinate( curr_child, arc_end ) )
return false;
}
else if( text == "mid" )
{
if( !Get2DCoordinate( curr_child, arc_middle ) )
return false;
}
}
// To convert arc edge to segments, we are using SHAPE_ARC, but SHAPE_ARC use
// integer coords. So to avoid truncation, use a scaling factor.
// 1e5 is enough.
const double scale = 1e5;
SHAPE_ARC new_arc( VECTOR2I( arc_start.x*scale, arc_start.y*scale ),
VECTOR2I( arc_middle.x*scale, arc_middle.y*scale ),
VECTOR2I( arc_end.x*scale, arc_end.y*scale ), 0 );
double accuracy = 0.005*scale; // Approx accuracy is 5 microns
SHAPE_LINE_CHAIN segs_from_arc = new_arc.ConvertToPolyline( accuracy );
// Add segments to STEP polygon
for( int ll = 0; ll < segs_from_arc.PointCount(); ll++ )
m_poly.emplace_back( segs_from_arc.CPoint( ll ).x / scale,
segs_from_arc.CPoint( ll ).y / scale );
}
}
}
else if( text == "start" || text == "center" )
{
if( !Get2DCoordinate( child, m_start ) )
return false;
}
else if( text == "end" )
{
if( !Get2DCoordinate( child, m_end ) )
return false;
}
else if( text == "mid" )
{
if( !Get2DCoordinate( child, m_middle ) )
return false;
m_arcHasMiddlePoint = true;
}
else if( text == "angle" )
{
if( child->GetNumberOfChildren() < 2
|| ( !child->GetChild( 1 )->IsDouble() && !child->GetChild( 1 )->IsInteger() ) )
{
wxLogMessage( wxT( "* bad angle data\n" ) );
return false;
}
if( child->GetChild( 1 )->IsDouble() )
m_angle = child->GetChild( 1 )->GetDouble();
else
m_angle = child->GetChild( 1 )->GetInteger();
m_angle = m_angle / 180.0 * M_PI;
}
else if( text == "layer" )
{
const OPT<std::string> layer = GetLayerName( *child );
if( !layer )
{
std::ostringstream ostr;
ostr << "* bad layer data: " << child->AsString();
wxLogMessage( wxT( "%s\n" ), ostr.str().c_str() );
return false;
}
// NOTE: for the moment we only process Edge.Cuts
if( *layer == "Edge.Cuts" )
m_layer = LAYER_EDGE;
}
}
// New arcs are defined by start middle and end points instead of center,
// start and arc angle
// So convert new params to old params
if( CURVE_ARC == aCurveType && m_arcHasMiddlePoint )
{
// To calculate old params, we are using SHAPE_ARC, but SHAPE_ARC use
// integer coords. So to avoid truncation, use a scaling factor.
// 1e5 is enough.
const double scale = 1e5;
SHAPE_ARC new_arc( VECTOR2I( m_start.x*scale, m_start.y*scale ),
VECTOR2I( m_middle.x*scale, m_middle.y*scale ),
VECTOR2I( m_end.x*scale, m_end.y*scale ), 0 );
VECTOR2I center = new_arc.GetCenter();
m_start.x = center.x/scale;
m_start.y = center.y/scale;
m_end.x = new_arc.GetP0().x / scale;
m_end.y = new_arc.GetP0().y / scale;
m_ep.x = new_arc.GetP1().x / scale;
m_ep.y = new_arc.GetP1().y / scale;
m_angle = new_arc.GetCentralAngle().AsRadians();
}
return true;
}
std::string KICADCURVE::Describe() const
{
std::ostringstream desc;
switch( m_form )
{
case CURVE_LINE:
desc << "line start: " << m_start << " end: " << m_end;
break;
case CURVE_ARC:
desc << "arc center: " << m_start << " radius: " << m_radius
<< " angle: " << 180.0 * m_angle / M_PI
<< " arc start: " << m_end << " arc end: " << m_ep;
break;
case CURVE_CIRCLE:
desc << "circle center: " << m_start << " radius: " << m_radius;
break;
case CURVE_BEZIER:
desc << "bezier start: " << m_start << " end: " << m_end
<< " ctrl1: " << m_bezierctrl1 << " ctrl2: " << m_bezierctrl2 ;
break;
default:
desc << "<invalid curve type>";
break;
}
return desc.str();
}
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