/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2014-2017 CERN
 * Copyright (C) 2016 KiCad Developers, see AUTHORS.txt for contributors.
 * @author Maciej Suminski <maciej.suminski@cern.ch>
 *
 * 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 "drawing_tool.h"
#include "pcb_actions.h"

#include <wxPcbStruct.h>
#include <class_draw_panel_gal.h>
#include <project.h>
#include <id.h>
#include <pcbnew_id.h>
#include <confirm.h>
#include <dialog_edit_module_text.h>
#include <import_dxf/dialog_dxf_import.h>

#include <view/view_group.h>
#include <view/view_controls.h>
#include <view/view.h>
#include <gal/graphics_abstraction_layer.h>
#include <tool/tool_manager.h>
#include <geometry/direction45.h>
#include <ratsnest_data.h>
#include <board_commit.h>
#include <scoped_set_reset.h>
#include <bitmaps.h>
#include <hotkeys.h>
#include <painter.h>

#include <preview_items/arc_assistant.h>

#include <class_board.h>
#include <class_edge_mod.h>
#include <class_pcb_text.h>
#include <class_dimension.h>
#include <class_zone.h>
#include <class_module.h>

#include <tools/selection_tool.h>
#include <tools/tool_event_utils.h>
#include <tools/zone_create_helper.h>

using SCOPED_DRAW_MODE = SCOPED_SET_RESET<DRAWING_TOOL::MODE>;

// Drawing tool actions
TOOL_ACTION PCB_ACTIONS::drawLine( "pcbnew.InteractiveDrawing.line",
        AS_GLOBAL, 0,
        _( "Draw Line" ), _( "Draw a line" ), NULL, AF_ACTIVATE );

TOOL_ACTION PCB_ACTIONS::drawGraphicPolygon( "pcbnew.InteractiveDrawing.graphicPolygon",
        AS_GLOBAL, 0,
        _( "Draw Graphic Polygon" ), _( "Draw a graphic polygon" ), NULL, AF_ACTIVATE );

TOOL_ACTION PCB_ACTIONS::drawCircle( "pcbnew.InteractiveDrawing.circle",
        AS_GLOBAL, 0,
        _( "Draw Circle" ), _( "Draw a circle" ), NULL, AF_ACTIVATE );

TOOL_ACTION PCB_ACTIONS::drawArc( "pcbnew.InteractiveDrawing.arc",
        AS_GLOBAL, 0,
        _( "Draw Arc" ), _( "Draw an arc" ), NULL, AF_ACTIVATE );

TOOL_ACTION PCB_ACTIONS::placeText( "pcbnew.InteractiveDrawing.text",
        AS_GLOBAL, 0,
        _( "Add Text" ), _( "Add a text" ), NULL, AF_ACTIVATE );

TOOL_ACTION PCB_ACTIONS::drawDimension( "pcbnew.InteractiveDrawing.dimension",
        AS_GLOBAL, 0,
        _( "Add Dimension" ), _( "Add a dimension" ), NULL, AF_ACTIVATE );

TOOL_ACTION PCB_ACTIONS::drawZone( "pcbnew.InteractiveDrawing.zone",
        AS_GLOBAL, 0,
        _( "Add Filled Zone" ), _( "Add a filled zone" ), NULL, AF_ACTIVATE );

TOOL_ACTION PCB_ACTIONS::drawVia( "pcbnew.InteractiveDrawing.via",
        AS_GLOBAL, 0,
        _( "Add Vias" ), _( "Add free-stanging vias" ), NULL, AF_ACTIVATE );

TOOL_ACTION PCB_ACTIONS::drawZoneKeepout( "pcbnew.InteractiveDrawing.keepout",
        AS_GLOBAL, 0,
        _( "Add Keepout Area" ), _( "Add a keepout area" ), NULL, AF_ACTIVATE );

TOOL_ACTION PCB_ACTIONS::drawZoneCutout( "pcbnew.InteractiveDrawing.zoneCutout",
        AS_GLOBAL, 0,
        _( "Add a Zone Cutout" ), _( "Add a cutout area of an existing zone" ),
        add_zone_cutout_xpm, AF_ACTIVATE );

TOOL_ACTION PCB_ACTIONS::drawSimilarZone( "pcbnew.InteractiveDrawing.similarZone",
        AS_GLOBAL, 0,
        _( "Add a Similar Zone" ), _( "Add a zone with the same settings as an existing zone" ),
        add_zone_xpm, AF_ACTIVATE );

TOOL_ACTION PCB_ACTIONS::placeDXF( "pcbnew.InteractiveDrawing.placeDXF",
        AS_GLOBAL, 0,
        "Place DXF", "", NULL, AF_ACTIVATE );

TOOL_ACTION PCB_ACTIONS::setAnchor( "pcbnew.InteractiveDrawing.setAnchor",
        AS_GLOBAL, 0,
        _( "Place the Footprint Anchor" ), _( "Place the footprint anchor" ),
        NULL, AF_ACTIVATE );

TOOL_ACTION PCB_ACTIONS::incWidth( "pcbnew.InteractiveDrawing.incWidth",
        AS_CONTEXT, '+',
        _( "Increase Line Width" ), _( "Increase the line width" ) );

TOOL_ACTION PCB_ACTIONS::decWidth( "pcbnew.InteractiveDrawing.decWidth",
        AS_CONTEXT, '-',
        _( "Decrease Line Width" ), _( "Decrease the line width" ) );

TOOL_ACTION PCB_ACTIONS::arcPosture( "pcbnew.InteractiveDrawing.arcPosture",
        AS_CONTEXT, TOOL_ACTION::LegacyHotKey( HK_SWITCH_TRACK_POSTURE ),
        _( "Switch Arc Posture" ), _( "Switch the arc posture" ) );

/*
 * Contextual actions
 */

static TOOL_ACTION deleteLastPoint( "pcbnew.InteractiveDrawing.deleteLastPoint",
        AS_CONTEXT, WXK_BACK,
        _( "Delete Last Point" ), _( "Delete the last point added to the current item" ),
        undo_xpm );

static TOOL_ACTION closeZoneOutline( "pcbnew.InteractiveDrawing.closeZoneOutline",
        AS_CONTEXT, 0,
        _( "Close Zone Outline" ), _( "Close the outline of a zone in progress" ),
        checked_ok_xpm );


DRAWING_TOOL::DRAWING_TOOL() :
    PCB_TOOL( "pcbnew.InteractiveDrawing" ),
    m_view( nullptr ), m_controls( nullptr ),
    m_board( nullptr ), m_frame( nullptr ), m_mode( MODE::NONE ),
    m_lineWidth( 1 ),
    m_menu( *this )
{
}


DRAWING_TOOL::~DRAWING_TOOL()
{
}


bool DRAWING_TOOL::Init()
{
    auto activeToolFunctor = [ this ] ( const SELECTION& aSel ) {
                                 return m_mode != MODE::NONE;
                             };

    // some interactive drawing tools can undo the last point
    auto canUndoPoint = [ this ] ( const SELECTION& aSel ) {
                            return m_mode == MODE::ARC || m_mode == MODE::ZONE;
                        };

    // functor for zone-only actions
    auto zoneActiveFunctor = [this ] ( const SELECTION& aSel ) {
                                 return m_mode == MODE::ZONE;
                             };

    auto& ctxMenu = m_menu.GetMenu();

    // cancel current toool goes in main context menu at the top if present
    ctxMenu.AddItem( ACTIONS::cancelInteractive, activeToolFunctor, 1000 );

    // tool-specific actions
    ctxMenu.AddItem( closeZoneOutline, zoneActiveFunctor, 1000 );
    ctxMenu.AddItem( deleteLastPoint, canUndoPoint, 1000 );

    ctxMenu.AddSeparator( activeToolFunctor, 1000 );

    // Type-specific sub-menus will be added for us by other tools
    // For example, zone fill/unfill is provided by the PCB control tool

    // Finally, add the standard zoom/grid items
    m_menu.AddStandardSubMenus( *getEditFrame<PCB_BASE_FRAME>() );

    return true;
}


void DRAWING_TOOL::Reset( RESET_REASON aReason )
{
    // Init variables used by every drawing tool
    m_view = getView();
    m_controls = getViewControls();
    m_board = getModel<BOARD>();
    m_frame = getEditFrame<PCB_BASE_EDIT_FRAME>();
}


DRAWING_TOOL::MODE DRAWING_TOOL::GetDrawingMode() const
{
    return m_mode;
}


int DRAWING_TOOL::DrawLine( const TOOL_EVENT& aEvent )
{
    BOARD_ITEM_CONTAINER* parent = m_frame->GetModel();
    DRAWSEGMENT* line = m_editModules ? new EDGE_MODULE( (MODULE*) parent ) : new DRAWSEGMENT;

    OPT<VECTOR2D> startingPoint;
    BOARD_COMMIT commit( m_frame );

    SCOPED_DRAW_MODE scopedDrawMode( m_mode, MODE::LINE );

    m_frame->SetToolID( m_editModules ? ID_MODEDIT_LINE_TOOL : ID_PCB_ADD_LINE_BUTT,
            wxCURSOR_PENCIL, _( "Add graphic line" ) );
    m_lineWidth = getSegmentWidth( getDrawingLayer() );

    while( drawSegment( S_SEGMENT, line, startingPoint ) )
    {
        if( line )
        {
            commit.Add( line );
            commit.Push( _( "Draw a line segment" ) );
            startingPoint = VECTOR2D( line->GetEnd() );
        }
        else
        {
            startingPoint = NULLOPT;
        }

        line = m_editModules ? new EDGE_MODULE( (MODULE*) parent ) : new DRAWSEGMENT;
    }

    m_frame->SetNoToolSelected();

    return 0;
}


int DRAWING_TOOL::DrawCircle( const TOOL_EVENT& aEvent )
{
    BOARD_ITEM_CONTAINER* parent = m_frame->GetModel();
    DRAWSEGMENT*    circle = m_editModules ? new EDGE_MODULE( (MODULE*) parent ) : new DRAWSEGMENT;
    BOARD_COMMIT    commit( m_frame );

    SCOPED_DRAW_MODE scopedDrawMode( m_mode, MODE::CIRCLE );

    m_frame->SetToolID( m_editModules ? ID_MODEDIT_CIRCLE_TOOL : ID_PCB_CIRCLE_BUTT,
            wxCURSOR_PENCIL, _( "Add graphic circle" ) );
    m_lineWidth = getSegmentWidth( getDrawingLayer() );

    while( drawSegment( S_CIRCLE, circle ) )
    {
        if( circle )
        {
            commit.Add( circle );
            commit.Push( _( "Draw a circle" ) );
        }

        circle = m_editModules ? new EDGE_MODULE( (MODULE*) parent ) : new DRAWSEGMENT;
    }

    m_frame->SetNoToolSelected();

    return 0;
}


int DRAWING_TOOL::DrawArc( const TOOL_EVENT& aEvent )
{
    BOARD_ITEM_CONTAINER* parent = m_frame->GetModel();
    DRAWSEGMENT*    arc = m_editModules ? new EDGE_MODULE( (MODULE*) parent ) : new DRAWSEGMENT;
    BOARD_COMMIT    commit( m_frame );

    SCOPED_DRAW_MODE scopedDrawMode( m_mode, MODE::ARC );

    m_frame->SetToolID( m_editModules ? ID_MODEDIT_ARC_TOOL : ID_PCB_ARC_BUTT,
            wxCURSOR_PENCIL, _( "Add graphic arc" ) );
    m_lineWidth = getSegmentWidth( getDrawingLayer() );

    while( drawArc( arc ) )
    {
        if( arc )
        {
            commit.Add( arc );
            commit.Push( _( "Draw an arc" ) );
        }

        arc = m_editModules ? new EDGE_MODULE( (MODULE*) parent ) : new DRAWSEGMENT;
    }

    m_frame->SetNoToolSelected();

    return 0;
}


int DRAWING_TOOL::PlaceText( const TOOL_EVENT& aEvent )
{
    BOARD_ITEM* text = NULL;
    const BOARD_DESIGN_SETTINGS& dsnSettings = m_frame->GetDesignSettings();
    BOARD_COMMIT commit( m_frame );

    // Add a VIEW_GROUP that serves as a preview for the new item
    SELECTION preview;

    m_view->Add( &preview );

    m_toolMgr->RunAction( PCB_ACTIONS::selectionClear, true );
    m_controls->ShowCursor( true );
    m_controls->SetSnapping( true );
    // do not capture or auto-pan until we start placing some text

    SCOPED_DRAW_MODE scopedDrawMode( m_mode, MODE::TEXT );

    Activate();
    m_frame->SetToolID( m_editModules ? ID_MODEDIT_TEXT_TOOL : ID_PCB_ADD_TEXT_BUTT,
            wxCURSOR_PENCIL, _( "Add text" ) );

    // Main loop: keep receiving events
    while( OPT_TOOL_EVENT evt = Wait() )
    {
        VECTOR2I cursorPos = m_controls->GetCursorPosition();

        if( TOOL_EVT_UTILS::IsCancelInteractive( *evt ) )
        {
            if( text )
            {
                // Delete the old text and have another try
                delete text;
                text = NULL;

                preview.Clear();

                m_controls->SetAutoPan( false );
                m_controls->CaptureCursor( false );
                m_controls->ShowCursor( true );
            }
            else
                break;

            if( evt->IsActivate() ) // now finish unconditionally
                break;
        }
        else if( text && evt->Category() == TC_COMMAND )
        {
            if( TOOL_EVT_UTILS::IsRotateToolEvt( *evt ) )
            {
                const auto rotationAngle = TOOL_EVT_UTILS::GetEventRotationAngle(
                        *m_frame, *evt );

                text->Rotate( text->GetPosition(), rotationAngle );
                m_view->Update( &preview );
            }
            else if( evt->IsAction( &PCB_ACTIONS::flip ) )
            {
                text->Flip( text->GetPosition() );
                m_view->Update( &preview );
            }
        }
        else if( evt->IsClick( BUT_RIGHT ) )
        {
            m_menu.ShowContextMenu();
        }
        else if( evt->IsClick( BUT_LEFT ) )
        {
            if( !text )
            {
                // Init the new item attributes
                if( m_editModules )
                {
                    TEXTE_MODULE* textMod = new TEXTE_MODULE( (MODULE*) m_frame->GetModel() );

                    textMod->SetLayer( m_frame->GetActiveLayer() );
                    textMod->SetTextSize( dsnSettings.m_ModuleTextSize );
                    textMod->SetThickness( dsnSettings.m_ModuleTextWidth );
                    textMod->SetTextPos( wxPoint( cursorPos.x, cursorPos.y ) );

                    DialogEditModuleText textDialog( m_frame, textMod, NULL );
                    bool placing;

                    RunMainStack([&]() {
                        placing = textDialog.ShowModal() && ( textMod->GetText().Length() > 0 );
                    } );

                    if( placing )
                        text = textMod;
                    else
                        delete textMod;
                }
                else
                {
                    TEXTE_PCB* textPcb = new TEXTE_PCB( m_frame->GetModel() );
                    // TODO we have to set IS_NEW, otherwise InstallTextPCB.. creates an undo entry :| LEGACY_CLEANUP
                    textPcb->SetFlags( IS_NEW );

                    PCB_LAYER_ID layer = m_frame->GetActiveLayer();
                    textPcb->SetLayer( layer );

                    // Set the mirrored option for layers on the BACK side of the board
                    if( IsBackLayer( layer ) )
                        textPcb->SetMirrored( true );

                    textPcb->SetTextSize( dsnSettings.m_PcbTextSize );
                    textPcb->SetThickness( dsnSettings.m_PcbTextWidth );
                    textPcb->SetTextPos( wxPoint( cursorPos.x, cursorPos.y ) );

                    RunMainStack([&]() {
                        getEditFrame<PCB_EDIT_FRAME>()->InstallTextPCBOptionsFrame( textPcb, NULL );
                    } );

                    if( textPcb->GetText().IsEmpty() )
                        delete textPcb;
                    else
                        text = textPcb;
                }

                if( text == NULL )
                    continue;

                m_controls->CaptureCursor( true );
                m_controls->SetAutoPan( true );
                // m_controls->ShowCursor( false );

                preview.Add( text );
            }
            else
            {
                // assert( text->GetText().Length() > 0 );
                // assert( text->GetTextSize().x > 0 && text->GetTextSize().y > 0 );

                text->ClearFlags();
                preview.Remove( text );

                commit.Add( text );
                commit.Push( _( "Place a text" ) );

                m_controls->CaptureCursor( false );
                m_controls->SetAutoPan( false );
                m_controls->ShowCursor( true );

                text = NULL;
            }
        }
        else if( text && evt->IsMotion() )
        {
            text->SetPosition( wxPoint( cursorPos.x, cursorPos.y ) );

            // Show a preview of the item
            m_view->Update( &preview );
        }
    }

    m_view->Remove( &preview );
    m_frame->SetNoToolSelected();

    return 0;
}


int DRAWING_TOOL::DrawDimension( const TOOL_EVENT& aEvent )
{
    DIMENSION* dimension = NULL;
    BOARD_COMMIT commit( m_frame );
    int maxThickness;

    // Add a VIEW_GROUP that serves as a preview for the new item
    SELECTION preview;

    m_view->Add( &preview );

    m_toolMgr->RunAction( PCB_ACTIONS::selectionClear, true );
    m_controls->ShowCursor( true );
    m_controls->SetSnapping( true );

    SCOPED_DRAW_MODE scopedDrawMode( m_mode, MODE::DIMENSION );

    Activate();
    m_frame->SetToolID( ID_PCB_DIMENSION_BUTT, wxCURSOR_PENCIL, _( "Add dimension" ) );
    m_lineWidth = getSegmentWidth( getDrawingLayer() );

    enum DIMENSION_STEPS
    {
        SET_ORIGIN = 0,
        SET_END,
        SET_HEIGHT,
        FINISHED
    };
    int step = SET_ORIGIN;

    // Main loop: keep receiving events
    while( OPT_TOOL_EVENT evt = Wait() )
    {
        VECTOR2I cursorPos = m_controls->GetCursorPosition();

        if( TOOL_EVT_UTILS::IsCancelInteractive( *evt ) )
        {
            if( step != SET_ORIGIN )    // start from the beginning
            {
                preview.Clear();

                delete dimension;
                step = SET_ORIGIN;
            }
            else
                break;

            if( evt->IsActivate() ) // now finish unconditionally
                break;
        }
        else if( evt->IsAction( &PCB_ACTIONS::incWidth ) && step != SET_ORIGIN )
        {
            m_lineWidth += WIDTH_STEP;
            dimension->SetWidth( m_lineWidth );
            m_view->Update( &preview );
        }
        else if( evt->IsAction( &PCB_ACTIONS::decWidth ) && step != SET_ORIGIN )
        {
            if( m_lineWidth > WIDTH_STEP )
            {
                m_lineWidth -= WIDTH_STEP;
                dimension->SetWidth( m_lineWidth );
                m_view->Update( &preview );
            }
        }
        else if( evt->IsClick( BUT_RIGHT ) )
        {
            m_menu.ShowContextMenu();
        }
        else if( evt->IsClick( BUT_LEFT ) )
        {
            switch( step )
            {
            case SET_ORIGIN:
            {
                PCB_LAYER_ID layer = getDrawingLayer();

                if( layer == Edge_Cuts )        // dimensions are not allowed on EdgeCuts
                    layer = Dwgs_User;

                // Init the new item attributes
                dimension = new DIMENSION( m_board );
                dimension->SetLayer( layer );
                dimension->SetOrigin( wxPoint( cursorPos.x, cursorPos.y ) );
                dimension->SetEnd( wxPoint( cursorPos.x, cursorPos.y ) );
                dimension->Text().SetTextSize( m_board->GetDesignSettings().m_PcbTextSize );

                int width = m_board->GetDesignSettings().m_PcbTextWidth;
                maxThickness = Clamp_Text_PenSize( width, dimension->Text().GetTextSize() );

                if( width > maxThickness )
                    width = maxThickness;

                dimension->Text().SetThickness( width );
                dimension->SetWidth( width );
                dimension->AdjustDimensionDetails();

                preview.Add( dimension );

                m_controls->SetAutoPan( true );
                m_controls->CaptureCursor( true );
            }
            break;

            case SET_END:
                dimension->SetEnd( wxPoint( cursorPos.x, cursorPos.y ) );

                // Dimensions that have origin and end in the same spot are not valid
                if( dimension->GetOrigin() == dimension->GetEnd() )
                    --step;

                break;

            case SET_HEIGHT:
            {
                if( wxPoint( cursorPos.x, cursorPos.y ) != dimension->GetPosition() )
                {
                    assert( dimension->GetOrigin() != dimension->GetEnd() );
                    assert( dimension->GetWidth() > 0 );

                    preview.Remove( dimension );

                    commit.Add( dimension );
                    commit.Push( _( "Draw a dimension" ) );
                }
            }
            break;
            }

            if( ++step == FINISHED )
            {
                step = SET_ORIGIN;
                m_controls->SetAutoPan( false );
                m_controls->CaptureCursor( false );
            }
        }
        else if( evt->IsMotion() )
        {
            switch( step )
            {
            case SET_END:
                dimension->SetEnd( wxPoint( cursorPos.x, cursorPos.y ) );
                break;

            case SET_HEIGHT:
            {
                // Calculating the direction of travel perpendicular to the selected axis
                double angle = dimension->GetAngle() + ( M_PI / 2 );

                wxPoint pos( cursorPos.x, cursorPos.y );
                wxPoint delta( pos - dimension->m_featureLineDO );
                double  height = ( delta.x * cos( angle ) ) + ( delta.y * sin( angle ) );
                dimension->SetHeight( height );
            }
            break;
            }

            // Show a preview of the item
            m_view->Update( &preview );
        }
    }

    if( step != SET_ORIGIN )
        delete dimension;

    m_view->Remove( &preview );
    m_frame->SetNoToolSelected();

    return 0;
}


int DRAWING_TOOL::DrawZone( const TOOL_EVENT& aEvent )
{
    SCOPED_DRAW_MODE scopedDrawMode( m_mode, MODE::ZONE );

    m_frame->SetToolID( ID_PCB_ZONES_BUTT, wxCURSOR_PENCIL, _( "Add zones" ) );

    return drawZone( false, ZONE_MODE::ADD );
}


int DRAWING_TOOL::DrawZoneKeepout( const TOOL_EVENT& aEvent )
{
    SCOPED_DRAW_MODE scopedDrawMode( m_mode, MODE::KEEPOUT );

    m_frame->SetToolID( ID_PCB_KEEPOUT_AREA_BUTT, wxCURSOR_PENCIL, _( "Add keepout" ) );

    return drawZone( true, ZONE_MODE::ADD );
}


int DRAWING_TOOL::DrawZoneCutout( const TOOL_EVENT& aEvent )
{
    SCOPED_DRAW_MODE scopedDrawMode( m_mode, MODE::ZONE );

    m_frame->SetToolID( ID_PCB_ZONES_BUTT, wxCURSOR_PENCIL, _( "Add zone cutout" ) );

    return drawZone( false, ZONE_MODE::CUTOUT );
}

int DRAWING_TOOL::DrawGraphicPolygon( const TOOL_EVENT& aEvent )
{
    SCOPED_DRAW_MODE scopedDrawMode( m_mode, MODE::GRAPHIC_POLYGON );

    m_frame->SetToolID( ID_PCB_ADD_POLYGON_BUTT, wxCURSOR_PENCIL, _( "Add graphic polygon" ) );

    return drawZone( false, ZONE_MODE::GRAPHIC_POLYGON );
}


int DRAWING_TOOL::DrawSimilarZone( const TOOL_EVENT& aEvent )
{
    SCOPED_DRAW_MODE scopedDrawMode( m_mode, MODE::ZONE );

    m_frame->SetToolID( ID_PCB_ZONES_BUTT, wxCURSOR_PENCIL, _( "Add similar zone" ) );

    return drawZone( false, ZONE_MODE::SIMILAR );
}


int DRAWING_TOOL::PlaceDXF( const TOOL_EVENT& aEvent )
{
    if( !m_frame->GetModel() )
        return 0;

    DIALOG_DXF_IMPORT dlg( m_frame );
    int dlgResult = dlg.ShowModal();

    const std::list<BOARD_ITEM*>& list = dlg.GetImportedItems();

    if( dlgResult != wxID_OK || list.empty() )
        return 0;

    VECTOR2I    cursorPos = m_controls->GetCursorPosition();
    VECTOR2I    delta = cursorPos - list.front()->GetPosition();

    // Add a VIEW_GROUP that serves as a preview for the new item
    SELECTION preview;
    BOARD_COMMIT commit( m_frame );

    // Build the undo list & add items to the current view
    for( auto item : list )
    {
        assert( item->Type() == PCB_LINE_T || item->Type() == PCB_TEXT_T );
        preview.Add( item );
    }

    BOARD_ITEM* firstItem = static_cast<BOARD_ITEM*>( preview.Front() );
    m_view->Add( &preview );

    m_toolMgr->RunAction( PCB_ACTIONS::selectionClear, true );
    m_controls->ShowCursor( true );
    m_controls->SetSnapping( true );

    SCOPED_DRAW_MODE scopedDrawMode( m_mode, MODE::DXF );

    Activate();

    // Main loop: keep receiving events
    while( OPT_TOOL_EVENT evt = Wait() )
    {
        cursorPos = m_controls->GetCursorPosition();

        if( evt->IsMotion() )
        {
            delta = cursorPos - firstItem->GetPosition();

            for( auto item : preview )
                static_cast<BOARD_ITEM*>( item )->Move( wxPoint( delta.x, delta.y ) );

            m_view->Update( &preview );
        }
        else if( evt->Category() == TC_COMMAND )
        {
            // TODO it should be handled by EDIT_TOOL, so add items and select?
            if( TOOL_EVT_UTILS::IsRotateToolEvt( *evt ) )
            {
                const auto  rotationPoint   = wxPoint( cursorPos.x, cursorPos.y );
                const auto  rotationAngle   = TOOL_EVT_UTILS::GetEventRotationAngle(
                        *m_frame, *evt );

                for( auto item : preview )
                {
                    static_cast<BOARD_ITEM*>( item )->Rotate( rotationPoint, rotationAngle );
                }

                m_view->Update( &preview );
            }
            else if( evt->IsAction( &PCB_ACTIONS::flip ) )
            {
                for( auto item : preview )
                    static_cast<BOARD_ITEM*>( item )->Flip( wxPoint( cursorPos.x, cursorPos.y ) );

                m_view->Update( &preview );
            }
            else if( TOOL_EVT_UTILS::IsCancelInteractive( *evt ) )
            {
                preview.FreeItems();
                break;
            }
        }
        else if( evt->IsClick( BUT_RIGHT ) )
        {
            m_menu.ShowContextMenu();
        }
        else if( evt->IsClick( BUT_LEFT ) )
        {
            // Place the drawing
            BOARD_ITEM_CONTAINER* parent = m_frame->GetModel();

            for( auto item : preview )
            {
                if( m_editModules )
                {
                    // Modules use different types for the same things,
                    // so we need to convert imported items to appropriate classes.
                    BOARD_ITEM* converted = NULL;

                    switch( item->Type() )
                    {
                    case PCB_TEXT_T:
                    {
                        TEXTE_PCB* text = static_cast<TEXTE_PCB*>( item );
                        TEXTE_MODULE* textMod = new TEXTE_MODULE( (MODULE*) parent );

                        // Assignment operator also copies the item PCB_TEXT_T type,
                        // so it cannot be added to a module which handles PCB_MODULE_TEXT_T
                        textMod->SetText( text->GetText() );
#if 0
                        textMod->SetTextSize( text->GetTextSize() );
                        textMod->SetThickness( text->GetThickness() );
                        textMod->SetOrientation( text->GetTextAngle() );
                        textMod->SetTextPos( text->GetTextPos() );
                        textMod->SetTextSize( text->GetTextSize() );
                        textMod->SetVisible( text->GetVisible() );
                        textMod->SetMirrored( text->IsMirrored() );
                        textMod->SetItalic( text->IsItalic() );
                        textMod->SetBold( text->IsBold() );
                        textMod->SetHorizJustify( text->GetHorizJustify() );
                        textMod->SetVertJustify( text->GetVertJustify() );
                        textMod->SetMultilineAllowed( text->IsMultilineAllowed() );
#else
                        textMod->EDA_TEXT::SetEffects( *text );
                        textMod->SetLocalCoord();    // using changed SetTexPos() via SetEffects()
#endif
                        converted = textMod;
                        break;
                    }

                    case PCB_LINE_T:
                    {
                        DRAWSEGMENT*    seg = static_cast<DRAWSEGMENT*>( item );
                        EDGE_MODULE*    modSeg = new EDGE_MODULE( (MODULE*) parent );

                        // Assignment operator also copies the item PCB_LINE_T type,
                        // so it cannot be added to a module which handles PCB_MODULE_EDGE_T
                        modSeg->SetWidth( seg->GetWidth() );
                        modSeg->SetStart( seg->GetStart() );
                        modSeg->SetEnd( seg->GetEnd() );
                        modSeg->SetAngle( seg->GetAngle() );
                        modSeg->SetShape( seg->GetShape() );
                        modSeg->SetType( seg->GetType() );
                        modSeg->SetBezControl1( seg->GetBezControl1() );
                        modSeg->SetBezControl2( seg->GetBezControl2() );
                        modSeg->SetBezierPoints( seg->GetBezierPoints() );
                        modSeg->SetPolyPoints( seg->GetPolyPoints() );
                        modSeg->SetLocalCoord();
                        converted = modSeg;
                        break;
                    }

                    default:
                        assert( false );
                        break;
                    }

                    if( converted )
                        converted->SetLayer( static_cast<BOARD_ITEM*>( item )->GetLayer() );

                    delete item;
                    item = converted;
                }

                if( item )
                    commit.Add( item );
            }

            commit.Push( _( "Place a DXF drawing" ) );
            break;
        }
    }

    preview.Clear();
    m_view->Remove( &preview );

    return 0;
}


int DRAWING_TOOL::SetAnchor( const TOOL_EVENT& aEvent )
{
    assert( m_editModules );

    SCOPED_DRAW_MODE scopedDrawMode( m_mode, MODE::ANCHOR );

    Activate();
    m_frame->SetToolID( ID_MODEDIT_ANCHOR_TOOL, wxCURSOR_PENCIL,
            _( "Place the footprint anchor" ) );

    m_controls->ShowCursor( true );
    m_controls->SetSnapping( true );
    m_controls->SetAutoPan( true );
    m_controls->CaptureCursor( false );

    while( OPT_TOOL_EVENT evt = Wait() )
    {
        if( evt->IsClick( BUT_LEFT ) )
        {
            MODULE* module = (MODULE*) m_frame->GetModel();
            BOARD_COMMIT commit( m_frame );
            commit.Modify( module );

            // set the new relative internal local coordinates of footprint items
            VECTOR2I    cursorPos = m_controls->GetCursorPosition();
            wxPoint     moveVector = module->GetPosition() - wxPoint( cursorPos.x, cursorPos.y );
            module->MoveAnchorPosition( moveVector );

            commit.Push( _( "Move the footprint reference anchor" ) );

            // Usually, we do not need to change twice the anchor position,
            // so deselect the active tool
            break;
        }
        else if( evt->IsClick( BUT_RIGHT ) )
        {
            m_menu.ShowContextMenu();
        }
        else if( TOOL_EVT_UTILS::IsCancelInteractive( *evt ) )
            break;
    }

    m_frame->SetNoToolSelected();

    return 0;
}


bool DRAWING_TOOL::drawSegment( int aShape, DRAWSEGMENT*& aGraphic,
        OPT<VECTOR2D> aStartingPoint )
{
    // Only two shapes are currently supported
    assert( aShape == S_SEGMENT || aShape == S_CIRCLE );

    DRAWSEGMENT line45;

    // Add a VIEW_GROUP that serves as a preview for the new item
    SELECTION preview;
    m_view->Add( &preview );

    m_toolMgr->RunAction( PCB_ACTIONS::selectionClear, true );
    m_controls->ShowCursor( true );
    m_controls->SetSnapping( true );

    Activate();

    bool    direction45 = false;    // 45 degrees only mode
    bool    started = false;
    bool    IsOCurseurSet = ( m_frame->GetScreen()->m_O_Curseur != wxPoint( 0, 0 ) );
    VECTOR2I cursorPos = m_controls->GetCursorPosition();

    if( aStartingPoint )
    {
        // Init the new item attributes
        aGraphic->SetShape( (STROKE_T) aShape );
        aGraphic->SetWidth( m_lineWidth );
        aGraphic->SetStart( wxPoint( aStartingPoint->x, aStartingPoint->y ) );
        aGraphic->SetEnd( wxPoint( cursorPos.x, cursorPos.y ) );
        aGraphic->SetLayer( getDrawingLayer() );

        if( aShape == S_SEGMENT )
            line45 = *aGraphic; // used only for direction 45 mode with lines

        preview.Add( aGraphic );
        m_controls->SetAutoPan( true );
        m_controls->CaptureCursor( true );

        if( !IsOCurseurSet )
            m_frame->GetScreen()->m_O_Curseur = wxPoint( aStartingPoint->x, aStartingPoint->y );

        started = true;
    }

    // Main loop: keep receiving events
    while( OPT_TOOL_EVENT evt = Wait() )
    {
        cursorPos = m_controls->GetCursorPosition();

        // 45 degree angle constraint enabled with an option and toggled with Ctrl
        const bool limit45 = ( frame()->Settings().m_use45DegreeGraphicSegments != !!( evt->Modifier( MD_CTRL ) ) );

        if( direction45 != limit45 && started && aShape == S_SEGMENT )
        {
            direction45 = limit45;

            if( direction45 )
            {
                preview.Add( &line45 );
                make45DegLine( aGraphic, &line45 );
            }
            else
            {
                preview.Remove( &line45 );
                aGraphic->SetEnd( wxPoint( cursorPos.x, cursorPos.y ) );
            }

            m_view->Update( &preview );
        }

        if( TOOL_EVT_UTILS::IsCancelInteractive( *evt ) )
        {
            preview.Clear();
            m_view->Update( &preview );
            delete aGraphic;
            aGraphic = NULL;
            if( !IsOCurseurSet )
                m_frame->GetScreen()->m_O_Curseur = wxPoint( 0, 0 );
            break;
        }
        else if( evt->IsAction( &PCB_ACTIONS::layerChanged ) )
        {
            aGraphic->SetLayer( getDrawingLayer() );
            m_view->Update( &preview );
        }
        else if( evt->IsClick( BUT_RIGHT ) )
        {
            m_menu.ShowContextMenu();
        }
        else if( evt->IsClick( BUT_LEFT ) || evt->IsDblClick( BUT_LEFT ) )
        {
            if( !started )
            {
                // Init the new item attributes
                aGraphic->SetShape( (STROKE_T) aShape );
                aGraphic->SetWidth( m_lineWidth );
                aGraphic->SetStart( wxPoint( cursorPos.x, cursorPos.y ) );
                aGraphic->SetEnd( wxPoint( cursorPos.x, cursorPos.y ) );
                aGraphic->SetLayer( getDrawingLayer() );

                if( !IsOCurseurSet )
                    m_frame->GetScreen()->m_O_Curseur = wxPoint( cursorPos.x, cursorPos.y );

                if( aShape == S_SEGMENT )
                    line45 = *aGraphic; // used only for direction 45 mode with lines

                preview.Add( aGraphic );
                m_controls->SetAutoPan( true );
                m_controls->CaptureCursor( true );

                started = true;
            }
            else
            {
                if( aGraphic->GetEnd() == aGraphic->GetStart()
                    || ( evt->IsDblClick( BUT_LEFT ) && aShape == S_SEGMENT ) )
                // User has clicked twice in the same spot
                {
                    // a clear sign that the current drawing is finished
                    // Now we have to add the helper line as well
                    if( direction45 )
                    {
                        BOARD_ITEM_CONTAINER* parent = m_frame->GetModel();
                        DRAWSEGMENT* l = m_editModules ? new EDGE_MODULE( (MODULE*) parent )
                                         : new DRAWSEGMENT;

                        // Copy coordinates, layer, etc.
                        *static_cast<DRAWSEGMENT*>( l ) = line45;
                        l->SetEnd( aGraphic->GetStart() );

                        BOARD_COMMIT commit( m_frame );
                        commit.Add( l );
                        commit.Push( _( "Draw a line" ) );
                    }

                    delete aGraphic;
                    aGraphic = NULL;
                }

                preview.Clear();
                break;
            }
        }
        else if( evt->IsMotion() )
        {
            // 45 degree lines
            if( direction45 && aShape == S_SEGMENT )
                make45DegLine( aGraphic, &line45 );
            else
                aGraphic->SetEnd( wxPoint( cursorPos.x, cursorPos.y ) );

            m_view->Update( &preview );
        }
        else if( evt->IsAction( &PCB_ACTIONS::incWidth ) )
        {
            m_lineWidth += WIDTH_STEP;
            aGraphic->SetWidth( m_lineWidth );
            line45.SetWidth( m_lineWidth );
            m_view->Update( &preview );
        }
        else if( evt->IsAction( &PCB_ACTIONS::decWidth ) && ( m_lineWidth > WIDTH_STEP ) )
        {
            m_lineWidth -= WIDTH_STEP;
            aGraphic->SetWidth( m_lineWidth );
            line45.SetWidth( m_lineWidth );
            m_view->Update( &preview );
        }
        else if( evt->IsAction( &PCB_ACTIONS::resetCoords ) )
        {
            IsOCurseurSet = true;
        }
    }

    if( !IsOCurseurSet ) // reset the relative coordinte if it was not set before
        m_frame->GetScreen()->m_O_Curseur = wxPoint( 0, 0 );

    m_view->Remove( &preview );
    m_controls->SetAutoPan( false );
    m_controls->CaptureCursor( false );

    return started;
}


/**
 * Update an arc DRAWSEGMENT from the current state
 * of an Arc Geometry Manager
 */
static void updateArcFromConstructionMgr( const KIGFX::PREVIEW::ARC_GEOM_MANAGER& aMgr,
        DRAWSEGMENT& aArc )
{
    auto vec = aMgr.GetOrigin();

    aArc.SetCenter( { vec.x, vec.y } );

    vec = aMgr.GetStartRadiusEnd();
    aArc.SetArcStart( { vec.x, vec.y } );

    aArc.SetAngle( RAD2DECIDEG( -aMgr.GetSubtended() ) );
}


bool DRAWING_TOOL::drawArc( DRAWSEGMENT*& aGraphic )
{
    m_toolMgr->RunAction( PCB_ACTIONS::selectionClear, true );

    // Arc geometric construction manager
    KIGFX::PREVIEW::ARC_GEOM_MANAGER arcManager;

    // Arc drawing assistant overlay
    KIGFX::PREVIEW::ARC_ASSISTANT arcAsst( arcManager );

    // Add a VIEW_GROUP that serves as a preview for the new item
    SELECTION preview;
    m_view->Add( &preview );
    m_view->Add( &arcAsst );

    m_controls->ShowCursor( true );
    m_controls->SetSnapping( true );

    Activate();

    bool firstPoint = false;

    // Main loop: keep receiving events
    while( OPT_TOOL_EVENT evt = Wait() )
    {
        const VECTOR2I cursorPos = m_controls->GetCursorPosition();

        if( evt->IsClick( BUT_LEFT ) )
        {
            if( !firstPoint )
            {
                m_controls->SetAutoPan( true );
                m_controls->CaptureCursor( true );

                PCB_LAYER_ID layer = getDrawingLayer();

                // Init the new item attributes
                // (non-geometric, those are handled by the manager)
                aGraphic->SetShape( S_ARC );
                aGraphic->SetWidth( m_lineWidth );
                aGraphic->SetLayer( layer );

                preview.Add( aGraphic );
                firstPoint = true;
            }

            arcManager.AddPoint( cursorPos, true );
        }
        else if( evt->IsAction( &deleteLastPoint ) )
        {
            arcManager.RemoveLastPoint();
        }
        else if( evt->IsMotion() )
        {
            // set angle snap
            arcManager.SetAngleSnap( evt->Modifier( MD_CTRL ) );

            // update, but don't step the manager state
            arcManager.AddPoint( cursorPos, false );
        }
        else if( TOOL_EVT_UTILS::IsCancelInteractive( *evt ) )
        {
            preview.Clear();
            delete aGraphic;
            aGraphic = nullptr;
            break;
        }
        else if( evt->IsClick( BUT_RIGHT ) )
        {
            m_menu.ShowContextMenu();
        }
        else if( evt->IsAction( &PCB_ACTIONS::incWidth ) )
        {
            m_lineWidth += WIDTH_STEP;
            aGraphic->SetWidth( m_lineWidth );
            m_view->Update( &preview );
        }
        else if( evt->IsAction( &PCB_ACTIONS::decWidth ) && m_lineWidth > WIDTH_STEP )
        {
            m_lineWidth -= WIDTH_STEP;
            aGraphic->SetWidth( m_lineWidth );
            m_view->Update( &preview );
        }
        else if( evt->IsAction( &PCB_ACTIONS::arcPosture ) )
        {
            arcManager.ToggleClockwise();
        }

        if( arcManager.IsComplete() )
        {
            break;
        }
        else if( arcManager.HasGeometryChanged() )
        {
            updateArcFromConstructionMgr( arcManager, *aGraphic );
            m_view->Update( &preview );
            m_view->Update( &arcAsst );
        }
    }

    preview.Remove( aGraphic );
    m_view->Remove( &arcAsst );
    m_view->Remove( &preview );
    m_controls->SetAutoPan( false );
    m_controls->CaptureCursor( false );

    return !arcManager.IsReset();
}


bool DRAWING_TOOL::getSourceZoneForAction( ZONE_MODE aMode, ZONE_CONTAINER*& aZone )
{
    aZone = nullptr;

    // not an action that needs a source zone
    if( aMode == ZONE_MODE::ADD || aMode == ZONE_MODE::GRAPHIC_POLYGON )
        return true;

    SELECTION_TOOL* selTool = m_toolMgr->GetTool<SELECTION_TOOL>();
    const SELECTION& selection = selTool->GetSelection();

    if( selection.Empty() )
        m_toolMgr->RunAction( PCB_ACTIONS::selectionCursor, true );

    // we want a single zone
    if( selection.Size() != 1 )
        return false;

    aZone = dyn_cast<ZONE_CONTAINER*>( selection[0] );

    // expected a zone, but didn't get one
    if( !aZone )
        return false;

    return true;
}


void DRAWING_TOOL::runPolygonEventLoop( POLYGON_GEOM_MANAGER& polyGeomMgr )
{
    auto&   controls    = *getViewControls();
    bool    started     = false;

    while( OPT_TOOL_EVENT evt = Wait() )
    {
        VECTOR2I cursorPos = controls.GetCursorPosition();

        if( TOOL_EVT_UTILS::IsCancelInteractive( *evt ) )
        {
            // pre-empted by another tool, give up
            // cancelled without an inprogress polygon, give up
            if( !polyGeomMgr.IsPolygonInProgress() || evt->IsActivate() )
            {
                break;
            }

            polyGeomMgr.Reset();
            // start again
            started = false;

            controls.SetAutoPan( false );
            controls.CaptureCursor( false );
        }
        else if( evt->IsClick( BUT_RIGHT ) )
        {
            m_menu.ShowContextMenu();
        }
        // events that lock in nodes
        else if( evt->IsClick( BUT_LEFT )
                 || evt->IsDblClick( BUT_LEFT )
                 || evt->IsAction( &closeZoneOutline ) )
        {
            // Check if it is double click / closing line (so we have to finish the zone)
            const bool endPolygon = evt->IsDblClick( BUT_LEFT )
                                    || evt->IsAction( &closeZoneOutline )
                                    || polyGeomMgr.NewPointClosesOutline( cursorPos );

            if( endPolygon )
            {
                polyGeomMgr.SetFinished();
                polyGeomMgr.Reset();

                // ready to start again
                started = false;
                controls.SetAutoPan( false );
                controls.CaptureCursor( false );
            }
            // adding a corner
            else if( polyGeomMgr.AddPoint( cursorPos ) )
            {
                if( !started )
                {
                    started = true;
                    controls.SetAutoPan( true );
                    controls.CaptureCursor( true );
                }
            }
        }
        else if( evt->IsAction( &deleteLastPoint ) )
        {
            polyGeomMgr.DeleteLastCorner();

            if( !polyGeomMgr.IsPolygonInProgress() )
            {
                // report finished as an empty shape
                polyGeomMgr.SetFinished();

                // start again
                started = false;
                controls.SetAutoPan( false );
                controls.CaptureCursor( false );
            }
        }
        else if( polyGeomMgr.IsPolygonInProgress()
                 && ( evt->IsMotion() || evt->IsDrag( BUT_LEFT ) ) )
        {
            bool draw45 = evt->Modifier( MD_CTRL );
            polyGeomMgr.SetLeaderMode( draw45 ? POLYGON_GEOM_MANAGER::LEADER_MODE::DEG45
                    : POLYGON_GEOM_MANAGER::LEADER_MODE::DIRECT );
            polyGeomMgr.SetCursorPosition( cursorPos );
        }
    }    // end while
}


int DRAWING_TOOL::drawZone( bool aKeepout, ZONE_MODE aMode )
{
    // get a source zone, if we need one. We need it for:
    // ZONE_MODE::CUTOUT (adding a hole to the source zone)
    // ZONE_MODE::SIMILAR (creating a new zone using settings of source zone
    ZONE_CONTAINER* sourceZone = nullptr;

    if( !getSourceZoneForAction( aMode, sourceZone ) )
        return 0;

    ZONE_CREATE_HELPER::PARAMS params;

    params.m_keepout = aKeepout;
    params.m_mode = aMode;
    params.m_sourceZone = sourceZone;

    ZONE_CREATE_HELPER zoneTool( *this, params );

    // the geometry manager which handles the zone geometry, and
    // hands the calculated points over to the zone creator tool
    POLYGON_GEOM_MANAGER polyGeomMgr( zoneTool );

    Activate();    // register for events

    auto& controls = *getViewControls();

    m_toolMgr->RunAction( PCB_ACTIONS::selectionClear, true );

    controls.ShowCursor( true );
    controls.SetSnapping( true );

    runPolygonEventLoop( polyGeomMgr );

    m_frame->SetNoToolSelected();

    return 0;
}


void DRAWING_TOOL::make45DegLine( DRAWSEGMENT* aSegment, DRAWSEGMENT* aHelper ) const
{
    VECTOR2I    cursorPos = m_controls->GetCursorPosition();
    VECTOR2I    origin( aSegment->GetStart() );
    DIRECTION_45 direction( origin - cursorPos );
    SHAPE_LINE_CHAIN newChain = direction.BuildInitialTrace( origin, cursorPos );

    if( newChain.PointCount() > 2 )
    {
        aSegment->SetEnd( wxPoint( newChain.Point( -2 ).x, newChain.Point( -2 ).y ) );
        aHelper->SetStart( wxPoint( newChain.Point( -2 ).x, newChain.Point( -2 ).y ) );
        aHelper->SetEnd( wxPoint( newChain.Point( -1 ).x, newChain.Point( -1 ).y ) );
    }
    else
    {
        aSegment->SetEnd( wxPoint( cursorPos.x, cursorPos.y ) );
        aHelper->SetStart( wxPoint( cursorPos.x, cursorPos.y ) );
        aHelper->SetEnd( wxPoint( cursorPos.x, cursorPos.y ) );
    }
}


int DRAWING_TOOL::DrawVia( const TOOL_EVENT& aEvent )
{
    struct VIA_PLACER : public INTERACTIVE_PLACER_BASE
    {
        int findStitchedZoneNet( VIA* aVia )
        {
            const auto  pos     = aVia->GetPosition();
            const auto  lset    = aVia->GetLayerSet();

            for( auto tv : m_board->Tracks() ) // fixme: move to BOARD class?
            {
                if( tv->HitTest( pos ) && ( tv->GetLayerSet() & lset ).any() )
                    return -1;
            }

            for( auto mod : m_board->Modules() )
            {
                for( auto pad : mod->Pads() )
                {
                    if( pad->HitTest( pos ) && ( pad->GetLayerSet() & lset ).any() )
                        return -1;
                }
            }

            std::vector<ZONE_CONTAINER*> foundZones;

            for( auto zone : m_board->Zones() )
            {
                if( zone->HitTestFilledArea( pos ) )
                {
                    foundZones.push_back( zone );
                }
            }

            std::sort( foundZones.begin(), foundZones.end(),
                    [] ( const ZONE_CONTAINER* a, const ZONE_CONTAINER* b ) {
                return a->GetLayer() < b->GetLayer();
            } );

            // first take the net of the active layer
            for( auto z : foundZones )
            {
                if( m_frame->GetActiveLayer() == z->GetLayer() )
                    return z->GetNetCode();
            }

            // none? take the topmost visible layer
            for( auto z : foundZones )
            {
                if( m_board->IsLayerVisible( z->GetLayer() ) )
                    return z->GetNetCode();
            }

            return -1;
        }

        bool PlaceItem( BOARD_ITEM* aItem ) override
        {
            auto    via = static_cast<VIA*>( aItem );
            int     newNet = findStitchedZoneNet( via );

            if( newNet > 0 )
                via->SetNetCode( newNet );

            return false;
        }

        std::unique_ptr<BOARD_ITEM> CreateItem() override
        {
            auto&   ds = m_board->GetDesignSettings();
            VIA*    via = new VIA( m_board );

            via->SetNetCode( 0 );
            via->SetViaType( ds.m_CurrentViaType );

            // for microvias, the size and hole will be changed later.
            via->SetWidth( ds.GetCurrentViaSize() );
            via->SetDrill( ds.GetCurrentViaDrill() );

            // Usual via is from copper to component.
            // layer pair is B_Cu and F_Cu.
            via->SetLayerPair( B_Cu, F_Cu );

            PCB_LAYER_ID    first_layer = m_frame->GetActiveLayer();
            PCB_LAYER_ID    last_layer;

            // prepare switch to new active layer:
            if( first_layer != m_frame->GetScreen()->m_Route_Layer_TOP )
                last_layer = m_frame->GetScreen()->m_Route_Layer_TOP;
            else
                last_layer = m_frame->GetScreen()->m_Route_Layer_BOTTOM;

            // Adjust the actual via layer pair
            switch( via->GetViaType() )
            {
            case VIA_BLIND_BURIED:
                via->SetLayerPair( first_layer, last_layer );
                break;

            case VIA_MICROVIA:    // from external to the near neighbor inner layer
            {
                PCB_LAYER_ID last_inner_layer =
                    ToLAYER_ID( ( m_board->GetCopperLayerCount() - 2 ) );

                if( first_layer == B_Cu )
                    last_layer = last_inner_layer;
                else if( first_layer == F_Cu )
                    last_layer = In1_Cu;
                else if( first_layer == last_inner_layer )
                    last_layer = B_Cu;
                else if( first_layer == In1_Cu )
                    last_layer = F_Cu;

                // else error: will be removed later
                via->SetLayerPair( first_layer, last_layer );

                // Update diameter and hole size, which where set previously
                // for normal vias
                NETINFO_ITEM* net = via->GetNet();

                if( net )
                {
                    via->SetWidth( net->GetMicroViaSize() );
                    via->SetDrill( net->GetMicroViaDrillSize() );
                }
            }
            break;

            default:
                break;
            }

            return std::unique_ptr<BOARD_ITEM>( via );
        }
    };

    VIA_PLACER placer;

    frame()->SetToolID( ID_PCB_DRAW_VIA_BUTT, wxCURSOR_PENCIL, _( "Add vias" ) );

    doInteractiveItemPlacement( &placer, _( "Place via" ),
            IPO_REPEAT | IPO_SINGLE_CLICK | IPO_ROTATE | IPO_FLIP | IPO_PROPERTIES );

    frame()->SetToolID( ID_NO_TOOL_SELECTED, wxCURSOR_DEFAULT, wxEmptyString );

    return 0;
}


void DRAWING_TOOL::setTransitions()
{
    Go( &DRAWING_TOOL::DrawLine, PCB_ACTIONS::drawLine.MakeEvent() );
    Go( &DRAWING_TOOL::DrawGraphicPolygon, PCB_ACTIONS::drawGraphicPolygon.MakeEvent() );
    Go( &DRAWING_TOOL::DrawCircle, PCB_ACTIONS::drawCircle.MakeEvent() );
    Go( &DRAWING_TOOL::DrawArc, PCB_ACTIONS::drawArc.MakeEvent() );
    Go( &DRAWING_TOOL::DrawDimension, PCB_ACTIONS::drawDimension.MakeEvent() );
    Go( &DRAWING_TOOL::DrawZone, PCB_ACTIONS::drawZone.MakeEvent() );
    Go( &DRAWING_TOOL::DrawZoneKeepout, PCB_ACTIONS::drawZoneKeepout.MakeEvent() );
    Go( &DRAWING_TOOL::DrawZoneCutout, PCB_ACTIONS::drawZoneCutout.MakeEvent() );
    Go( &DRAWING_TOOL::DrawSimilarZone, PCB_ACTIONS::drawSimilarZone.MakeEvent() );
    Go( &DRAWING_TOOL::DrawVia, PCB_ACTIONS::drawVia.MakeEvent() );
    Go( &DRAWING_TOOL::PlaceText, PCB_ACTIONS::placeText.MakeEvent() );
    Go( &DRAWING_TOOL::PlaceDXF, PCB_ACTIONS::placeDXF.MakeEvent() );
    Go( &DRAWING_TOOL::SetAnchor, PCB_ACTIONS::setAnchor.MakeEvent() );
}


int DRAWING_TOOL::getSegmentWidth( unsigned int aLayer ) const
{
    assert( m_board );

    if( aLayer == Edge_Cuts )
        return m_board->GetDesignSettings().m_EdgeSegmentWidth;
    else if( m_editModules )
        return m_board->GetDesignSettings().m_ModuleSegmentWidth;
    else
        return m_board->GetDesignSettings().m_DrawSegmentWidth;
}


PCB_LAYER_ID DRAWING_TOOL::getDrawingLayer() const
{
    PCB_LAYER_ID layer = m_frame->GetActiveLayer();

    if( IsCopperLayer( layer ) )
    {
        if( layer == F_Cu )
            layer = F_SilkS;
        else if( layer == B_Cu )
            layer = B_SilkS;
        else
            layer = Dwgs_User;

        m_frame->SetActiveLayer( layer );
    }

    return layer;
}


const unsigned int DRAWING_TOOL::WIDTH_STEP = 100000;