pad_custom_shape_functions.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2018 Jean-Pierre Charras, jp.charras at wanadoo.fr
 * Copyright (C) 1992-2019 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 <board.h>
#include <board_design_settings.h>
#include <board_item.h>
#include <pcb_shape.h>
#include <pad.h>
#include <convert_basic_shapes_to_polygon.h>
#include <geometry/shape_rect.h>


/*
 * Has meaning only for free shape pads.
 * add a free shape to the shape list.
 * the shape is a polygon (can be with thick outline), segment, circle or arc
 */

void PAD::AddPrimitivePoly( const SHAPE_POLY_SET& aPoly, int aThickness, bool aFilled )
{
    // If aPoly has holes, convert it to a polygon with no holes.
    SHAPE_POLY_SET poly_no_hole;
    poly_no_hole.Append( aPoly );
    poly_no_hole.Fracture( SHAPE_POLY_SET::PM_STRICTLY_SIMPLE );

    PCB_SHAPE* item = new PCB_SHAPE();
    item->SetShape( SHAPE_T::POLY );
    item->SetFilled( aFilled );
    item->SetPolyShape( poly_no_hole );
    item->SetWidth( aThickness );
    item->SetParent( this );
    m_editPrimitives.emplace_back( item );
    SetDirty();
}


void PAD::AddPrimitivePoly( const std::vector<wxPoint>& aPoly, int aThickness, bool aFilled )
{
    PCB_SHAPE* item = new PCB_SHAPE( nullptr, SHAPE_T::POLY );
    item->SetFilled( aFilled );
    item->SetPolyPoints( aPoly );
    item->SetWidth( aThickness );
    item->SetParent( this );
    m_editPrimitives.emplace_back( item );
    SetDirty();
}


void PAD::AddPrimitiveSegment( const wxPoint& aStart, const wxPoint& aEnd, int aThickness )
{
    PCB_SHAPE* item = new PCB_SHAPE( nullptr, SHAPE_T::SEGMENT );
    item->SetFilled( false );
    item->SetStart( aStart );
    item->SetEnd( aEnd );
    item->SetWidth( aThickness );
    item->SetParent( this );
    m_editPrimitives.emplace_back( item );
    SetDirty();
}


void PAD::AddPrimitiveArc( const wxPoint& aCenter, const wxPoint& aStart, int aArcAngle,
                           int aThickness )
{
    PCB_SHAPE* item = new PCB_SHAPE( nullptr, SHAPE_T::ARC );
    item->SetFilled( false );
    item->SetCenter( aCenter );
    item->SetStart( aStart );
    item->SetArcAngleAndEnd( aArcAngle );
    item->SetWidth( aThickness );
    item->SetParent( this );
    m_editPrimitives.emplace_back( item );
    SetDirty();
}


void PAD::AddPrimitiveCurve( const wxPoint& aStart, const wxPoint& aEnd, const wxPoint& aCtrl1,
                             const wxPoint& aCtrl2, int aThickness )
{
    PCB_SHAPE* item = new PCB_SHAPE( nullptr, SHAPE_T::BEZIER );
    item->SetFilled( false );
    item->SetStart( aStart );
    item->SetEnd( aEnd );
    item->SetBezierC1( aCtrl1 );
    item->SetBezierC2( aCtrl2 );
    item->SetWidth( aThickness );
    item->SetParent( this );
    m_editPrimitives.emplace_back( item );
    SetDirty();
}


void PAD::AddPrimitiveCircle( const wxPoint& aCenter, int aRadius, int aThickness, bool aFilled )
{
    PCB_SHAPE* item = new PCB_SHAPE( nullptr, SHAPE_T::CIRCLE );
    item->SetFilled( aFilled );
    item->SetStart( aCenter );
    item->SetEnd( wxPoint( aCenter.x + aRadius, aCenter.y ) );
    item->SetWidth( aThickness );
    item->SetParent( this );
    m_editPrimitives.emplace_back( item );
    SetDirty();
}


void PAD::AddPrimitiveRect( const wxPoint& aStart, const wxPoint& aEnd, int aThickness,
                            bool aFilled)
{
    PCB_SHAPE* item = new PCB_SHAPE( nullptr, SHAPE_T:: RECT );
    item->SetFilled( aFilled );
    item->SetStart( aStart );
    item->SetEnd( aEnd );
    item->SetWidth( aThickness );
    item->SetParent( this );
    m_editPrimitives.emplace_back( item );
    SetDirty();
}


void PAD::ReplacePrimitives( const std::vector<std::shared_ptr<PCB_SHAPE>>& aPrimitivesList )
{
    // clear old list
    DeletePrimitivesList();

    // Import to the given shape list
    if( aPrimitivesList.size() )
        AppendPrimitives( aPrimitivesList );

    SetDirty();
}


void PAD::AppendPrimitives( const std::vector<std::shared_ptr<PCB_SHAPE>>& aPrimitivesList )
{
    // Add duplicates of aPrimitivesList to the pad primitives list:
    for( const std::shared_ptr<PCB_SHAPE>& prim : aPrimitivesList )
        AddPrimitive( new PCB_SHAPE( *prim ) );

    SetDirty();
}


void PAD::AddPrimitive( PCB_SHAPE* aPrimitive )
{
    aPrimitive->SetParent( this );
    m_editPrimitives.emplace_back( aPrimitive );

    SetDirty();
}


// clear the basic shapes list and associated data
void PAD::DeletePrimitivesList()
{
    m_editPrimitives.clear();

    SetDirty();
}


void PAD::addPadPrimitivesToPolygon( SHAPE_POLY_SET* aMergedPolygon, int aError,
                                     ERROR_LOC aErrorLoc ) const
{
    SHAPE_POLY_SET polyset;

    for( const std::shared_ptr<PCB_SHAPE>& primitive : m_editPrimitives )
    {
        primitive->TransformShapeWithClearanceToPolygon( polyset, UNDEFINED_LAYER, 0, aError,
                                                         aErrorLoc );
    }

    polyset.Simplify( SHAPE_POLY_SET::PM_FAST );

    // Merge all polygons with the initial pad anchor shape
    if( polyset.OutlineCount() )
    {
        aMergedPolygon->BooleanAdd( polyset, SHAPE_POLY_SET::PM_STRICTLY_SIMPLE );
        aMergedPolygon->Fracture( SHAPE_POLY_SET::PM_STRICTLY_SIMPLE );
    }
}

void PAD::MergePrimitivesAsPolygon( SHAPE_POLY_SET* aMergedPolygon, ERROR_LOC aErrorLoc ) const
{
    const BOARD* board = GetBoard();
    int          maxError = board ? board->GetDesignSettings().m_MaxError : ARC_HIGH_DEF;

    aMergedPolygon->RemoveAllContours();

    // Add the anchor pad shape in aMergedPolygon, others in aux_polyset:
    // The anchor pad is always at 0,0
    switch( GetAnchorPadShape() )
    {
    case PAD_SHAPE::RECT:
    {
        SHAPE_RECT rect( -GetSize().x / 2, -GetSize().y / 2, GetSize().x, GetSize().y );
        aMergedPolygon->AddOutline( rect.Outline() );
    }
        break;

    default:
    case PAD_SHAPE::CIRCLE:
        TransformCircleToPolygon( *aMergedPolygon, wxPoint( 0, 0 ), GetSize().x / 2, maxError,
                                  ERROR_INSIDE );
        break;
    }

    addPadPrimitivesToPolygon( aMergedPolygon, maxError, aErrorLoc );
}


bool PAD::GetBestAnchorPosition( VECTOR2I& aPos )
{
    SHAPE_POLY_SET poly;
    addPadPrimitivesToPolygon( &poly, ARC_LOW_DEF, ERROR_INSIDE );

    if( poly.OutlineCount() > 1 )
        return false;

    const int minSteps = 10;
    const int maxSteps = 50;

    int stepsX, stepsY;

    auto bbox = poly.BBox();

    if( bbox.GetWidth() < bbox.GetHeight() )
    {
        stepsX = minSteps;
        stepsY = minSteps * (double) bbox.GetHeight() / (double )(bbox.GetWidth() + 1);
    }
    else
    {
        stepsY = minSteps;
        stepsX = minSteps * (double) bbox.GetWidth() / (double )(bbox.GetHeight() + 1);
    }

    stepsX = std::max(minSteps, std::min( maxSteps, stepsX ) );
    stepsY = std::max(minSteps, std::min( maxSteps, stepsY ) );

    VECTOR2I center = bbox.Centre();

    int64_t minDist = std::numeric_limits<int64_t>::max();
    int64_t minDistEdge;

    if( GetAnchorPadShape() == PAD_SHAPE::CIRCLE )
    {
        minDistEdge = GetSize().x;
    }
    else
    {
        minDistEdge = std::max( GetSize().x, GetSize().y );
    }

    OPT<VECTOR2I> bestAnchor( []()->OPT<VECTOR2I> { return NULLOPT; }() );

    for( int y = 0; y < stepsY ; y++ )
    {
        for( int x = 0; x < stepsX; x++ )
        {
            VECTOR2I p = bbox.GetPosition();
            p.x += rescale( x, bbox.GetWidth(), (stepsX - 1) );
            p.y += rescale( y, bbox.GetHeight(), (stepsY - 1) );

            if( poly.Contains(p) )
            {

                int dist = (center - p).EuclideanNorm();
                int distEdge = poly.COutline(0).Distance( p, true );

                if( distEdge >= minDistEdge )
                {
                    if( dist < minDist )
                    {
                        bestAnchor = p;
                        minDist = dist;
                    }
                }
            }
        }
    }

    if( bestAnchor )
    {
        aPos = *bestAnchor;
        return true;
    }

    return false;
}