kicad/pcbnew/import_gfx/graphics_importer_buffer.cpp

/*
 * This program source code file is part of KICAD, a free EDA CAD application.
 *
 * Copyright (C) 2017 CERN
 * @author Janito Vaqueiro Ferreira Filho <janito.vff@gmail.com>
 *
 * 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 <eda_item.h>

#include <geometry/shape_line_chain.h>
#include <geometry/shape_poly_set.h>

#include "graphics_importer_buffer.h"

using namespace std;

template <typename T, typename... Args>
static std::unique_ptr<T> make_shape( const Args&... aArguments )
{
    return std::make_unique<T>( aArguments... );
}

void GRAPHICS_IMPORTER_BUFFER::AddLine( const VECTOR2D& aStart, const VECTOR2D& aEnd, double aWidth )
{
    m_shapes.push_back( make_shape< IMPORTED_LINE >( aStart, aEnd, aWidth ) );
}


void GRAPHICS_IMPORTER_BUFFER::AddCircle( const VECTOR2D& aCenter, double aRadius, double aWidth, bool aFilled )
{
    m_shapes.push_back( make_shape<IMPORTED_CIRCLE>( aCenter, aRadius, aWidth, aFilled ) );
}


void GRAPHICS_IMPORTER_BUFFER::AddArc( const VECTOR2D& aCenter, const VECTOR2D& aStart,
                                       double aAngle, double aWidth )
{
    m_shapes.push_back( make_shape<IMPORTED_ARC>( aCenter, aStart, aAngle, aWidth ) );
}


void GRAPHICS_IMPORTER_BUFFER::AddPolygon( const std::vector< VECTOR2D >& aVertices, double aWidth )
{
    m_shapes.push_back( make_shape<IMPORTED_POLYGON>( aVertices, aWidth ) );
    m_shapes.back()->SetParentShapeIndex( m_shapeFillRules.size() - 1 );
}


void GRAPHICS_IMPORTER_BUFFER::AddText( const VECTOR2D& aOrigin, const wxString& aText,
                                        double aHeight, double aWidth, double aThickness,
                                        double aOrientation, GR_TEXT_H_ALIGN_T aHJustify,
                                        GR_TEXT_V_ALIGN_T aVJustify )
{
    m_shapes.push_back( make_shape< IMPORTED_TEXT >( aOrigin, aText, aHeight, aWidth,
                        aThickness, aOrientation, aHJustify, aVJustify ) );
}


void GRAPHICS_IMPORTER_BUFFER::AddSpline( const VECTOR2D& aStart, const VECTOR2D& aBezierControl1,
                const VECTOR2D& aBezierControl2, const VECTOR2D& aEnd , double aWidth )
{
    m_shapes.push_back( make_shape<IMPORTED_SPLINE>( aStart, aBezierControl1, aBezierControl2, aEnd, aWidth ) );
}


void GRAPHICS_IMPORTER_BUFFER::AddShape( std::unique_ptr<IMPORTED_SHAPE>& aShape )
{
    m_shapes.push_back( std::move( aShape ) );
}


void GRAPHICS_IMPORTER_BUFFER::ImportTo( GRAPHICS_IMPORTER& aImporter )
{
    for( std::unique_ptr<IMPORTED_SHAPE>& shape : m_shapes )
        shape->ImportTo( aImporter );
}

// converts a single SVG-style polygon (multiple outlines, hole detection based on orientation, custom fill rule) to a format that can be digested by KiCad (single outline, fractured)
static void convertPolygon( std::list<std::unique_ptr<IMPORTED_SHAPE>>& aShapes,
                            std::vector<IMPORTED_POLYGON*>&             aPaths,
                            GRAPHICS_IMPORTER::POLY_FILL_RULE           aFillRule,
                            int aWidth )
{
    double minX = std::numeric_limits<double>::max();
    double minY = minX;
    double maxX = std::numeric_limits<double>::min();
    double maxY = maxX;

    // as Clipper/SHAPE_POLY_SET uses ints we first need to upscale to a reasonably large size (in integer coordinates)
    // to avoid loosing accuracy
    const double convert_scale = 1000000000.0;

    for( IMPORTED_POLYGON* path : aPaths )
    {
        for( VECTOR2D& v : path->Vertices() )
        {
            minX = std::min( minX, v.x );
            minY = std::min( minY, v.y );
            maxX = std::max( maxX, v.x );
            maxY = std::max( maxY, v.y );
        }
    }

    double origW = ( maxX - minX );
    double origH = ( maxY - minY );
    double upscaledW, upscaledH;

    if( origW > origH )
    {
        upscaledW = convert_scale;
        upscaledH = ( origH == 0.0f ? 0.0 : origH * convert_scale / origW );
    }
    else
    {
        upscaledH = convert_scale;
        upscaledW = ( origW == 0.0f ? 0.0 : origW * convert_scale / origH );
    }

    std::vector<SHAPE_LINE_CHAIN> upscaledPaths;

    for( IMPORTED_POLYGON* path : aPaths )
    {
        SHAPE_LINE_CHAIN lc;

        for( VECTOR2D& v : path->Vertices() )
        {
            int xp = KiROUND( ( v.x - minX ) * ( upscaledW / origW ) );
            int yp = KiROUND( ( v.y - minY ) * ( upscaledH / origH ) );
            lc.Append( xp, yp );
        }
        lc.SetClosed( true );
        upscaledPaths.push_back( lc );
    }

    SHAPE_POLY_SET result = SHAPE_POLY_SET::BuildPolysetFromOrientedPaths(
            upscaledPaths, false, aFillRule == GRAPHICS_IMPORTER::PF_EVEN_ODD );
    result.Fracture( SHAPE_POLY_SET::PM_STRICTLY_SIMPLE );

    for( int outl = 0; outl < result.OutlineCount(); outl++ )
    {
        const SHAPE_LINE_CHAIN& ro = result.COutline( outl );
        std::vector<VECTOR2D>   pts;
        for( int i = 0; i < ro.PointCount(); i++ )
        {
            double xp = (double) ro.CPoint( i ).x * ( origW / upscaledW ) + minX;
            double yp = (double) ro.CPoint( i ).y * ( origH / upscaledH ) + minY;
            pts.emplace_back( VECTOR2D( xp, yp ) );
        }

        aShapes.push_back( std::make_unique<IMPORTED_POLYGON>( pts, aWidth ) );
    }
}


void GRAPHICS_IMPORTER_BUFFER::PostprocessNestedPolygons()
{
    int curShapeIdx = 0;
    int lastWidth = 1;

    std::list<std::unique_ptr<IMPORTED_SHAPE>> newShapes;
    std::vector<IMPORTED_POLYGON*>             polypaths;

    for( auto& shape : m_shapes )
    {
        IMPORTED_POLYGON* poly = dynamic_cast<IMPORTED_POLYGON*>( shape.get() );

        if( !poly || poly->GetParentShapeIndex() < 0 )
        {
            newShapes.push_back( shape->clone() );
            continue;
        }

        lastWidth = poly->GetWidth();
        int index = poly->GetParentShapeIndex();

        if( index == curShapeIdx )
        {
            polypaths.push_back( poly );
        }
        else if( index == curShapeIdx + 1 )
        {
            convertPolygon( newShapes, polypaths, m_shapeFillRules[curShapeIdx], lastWidth );
            curShapeIdx++;
            polypaths.clear();
            polypaths.push_back( poly );
        }
    }

    convertPolygon( newShapes, polypaths, m_shapeFillRules[curShapeIdx], lastWidth );

    m_shapes.swap( newShapes );
}