Gerbview: export_to_pcbnew enhancement and fixes.

gerbview/CMakeLists.txt

@@ -17,6 +17,7 @@ include_directories(${CMAKE_CURRENT_SOURCE_DIR}
 set(DIALOGS_SRCS
     dialogs/gerbview_dialog_display_options_frame_base.cpp
     dialogs/gerbview_dialog_display_options_frame.cpp
+    dialogs/dialog_layers_select_to_pcb_base.cpp
     dialogs/dialog_print_using_printer.cpp
     dialogs/dialog_print_using_printer_base.cpp
     )

gerbview/class_gerber_draw_item.cpp

@@ -419,7 +419,7 @@ void GERBER_DRAW_ITEM::Draw( EDA_DRAW_PANEL* aPanel, wxDC* aDC, int aDrawMode,
         break;
 
     case GBR_ARC:
-        // Currently, arcs plotted witha rectangular aperture are not supported.
+        // Currently, arcs plotted with a rectangular aperture are not supported.
         // a round pen only is expected.
 #if 0     // for arc debug only
         GRLine( &aPanel->m_ClipBox, aDC, GetABPosition( m_Start ),

gerbview/export_to_pcbnew.cpp

@@ -10,13 +10,50 @@
 #include "confirm.h"
 #include "kicad_string.h"
 #include "gestfich.h"
+#include "trigo.h"
 
 #include "gerbview.h"
 #include "class_board_design_settings.h"
 #include "class_gerber_draw_item.h"
 
-static int SavePcbFormatAscii( GERBVIEW_FRAME* frame,
-                               FILE* File, int* LayerLookUpTable );
+
+/* A helper class to export a Gerber set of files to Pcbnew
+*/
+class GBR_TO_PCB_EXPORTER
+{
+    GERBVIEW_FRAME* m_gerbview_frame;   // the maint gerber frame
+    FILE * m_file;      // .brd file to write to
+    BOARD* m_pcb;       // the board to populate and export
+
+public:
+    GBR_TO_PCB_EXPORTER(GERBVIEW_FRAME * aFrame, FILE * aFile );
+    ~GBR_TO_PCB_EXPORTER();
+    bool ExportPcb( int* LayerLookUpTable );
+
+private:
+    bool WriteSetup( );  // Write the SETUP section data file
+    bool WriteGeneralDescrPcb( );
+    void export_non_copper_item( GERBER_DRAW_ITEM* aGbrItem, int aLayer );
+    void export_copper_item( GERBER_DRAW_ITEM* aGbrItem, int aLayer );
+    void export_flashed_copper_item( GERBER_DRAW_ITEM* aGbrItem, int aLayer );
+    void export_segline_copper_item( GERBER_DRAW_ITEM* aGbrItem, int aLayer );
+    void export_segarc_copper_item( GERBER_DRAW_ITEM* aGbrItem, int aLayer );
+    void cleanBoard();
+};
+
+GBR_TO_PCB_EXPORTER::GBR_TO_PCB_EXPORTER( GERBVIEW_FRAME * aFrame, FILE * aFile )
+{
+    m_gerbview_frame = aFrame;
+    m_file = aFile;
+    m_pcb = NULL;
+}
+
+GBR_TO_PCB_EXPORTER::~GBR_TO_PCB_EXPORTER()
+{
+    // the destructor should destroy all owned sub-objects
+    delete m_pcb;
+}
+
 
 
 /* Export data in pcbnew format
@@ -45,8 +82,6 @@ void GERBVIEW_FRAME::ExportDataInPcbnewFormat( wxCommandEvent& event )
 
     wxString PcbExt( wxT( ".brd" ) );
 
-    FILE*    dest;
-
     msg = wxT( "*" ) + PcbExt;
     FullFileName = EDA_FileSelector( _( "Board file name:" ),
                                      wxEmptyString,
@@ -68,53 +103,83 @@ void GERBVIEW_FRAME::ExportDataInPcbnewFormat( wxCommandEvent& event )
             if( !IsOK( this, _( "Ok to change the existing file ?" ) ) )
                 return;
         }
-        dest = wxFopen( FullFileName, wxT( "wt" ) );
-        if( dest == 0 )
+        FILE * file = wxFopen( FullFileName, wxT( "wt" ) );
+        if( file == NULL )
         {
             msg = _( "Unable to create " ) + FullFileName;
             DisplayError( this, msg );
             return;
         }
         GetScreen()->SetFileName( FullFileName );
-        SavePcbFormatAscii( this, dest, LayerLookUpTable );
-        fclose( dest );
+        GBR_TO_PCB_EXPORTER gbr_exporter( this, file );
+        gbr_exporter.ExportPcb( LayerLookUpTable );
+        fclose( file );
     }
 }
 
-
-static int WriteSetup( FILE* File, BOARD* Pcb )
+void GBR_TO_PCB_EXPORTER::cleanBoard()
 {
-    char text[1024];
+    // delete redundant vias
+    for( TRACK * track = m_pcb->m_Track; track; track = track->Next() )
+    {
+        if( track->m_Shape != VIA_THROUGH )
+            continue;
+
+        // Search and delete others vias
+        TRACK* next_track;
+        TRACK* alt_track = track->Next();
+        for( ; alt_track; alt_track = next_track )
+        {
+            next_track = alt_track->Next();
+            if( alt_track->m_Shape != VIA_THROUGH )
+                continue;
+
+            if( alt_track->m_Start != track->m_Start )
+                continue;
 
-    fprintf( File, "$SETUP\n" );
-    sprintf( text, "InternalUnit %f INCH\n", 1.0 / PCB_INTERNAL_UNIT );
-    fprintf( File, "%s", text );
+            // delete track
+            alt_track->UnLink();
+            delete alt_track;
+        }
+    }
+}
+
+bool GBR_TO_PCB_EXPORTER::WriteSetup( )
+{
+    fprintf( m_file, "$SETUP\n" );
+    fprintf( m_file, "InternalUnit %f INCH\n", 1.0 / PCB_INTERNAL_UNIT );
 
-    fprintf( File, "Layers %d\n", Pcb->GetCopperLayerCount() );
+    fprintf( m_file, "Layers %d\n", m_pcb->GetCopperLayerCount() );
 
-    fprintf( File, "$EndSETUP\n\n" );
-    return 1;
+    fprintf( m_file, "$EndSETUP\n\n" );
+    return true;
 }
 
 
-static bool WriteGeneralDescrPcb( BOARD* Pcb, FILE* File )
+bool GBR_TO_PCB_EXPORTER::WriteGeneralDescrPcb( )
 {
-    int NbLayers;
+    int nbLayers;
 
     /* Print the copper layer count */
-    NbLayers = Pcb->GetCopperLayerCount();
-    fprintf( File, "$GENERAL\n" );
-    fprintf( File, "LayerCount %d\n", NbLayers );
+    nbLayers = m_pcb->GetCopperLayerCount();
+    if( nbLayers <= 1 )  // Minimal layers count in Pcbnew is 2
+    {
+        nbLayers = 2;
+        m_pcb->SetCopperLayerCount(2);
+    }
+    fprintf( m_file, "$GENERAL\n" );
+    fprintf( m_file, "encoding utf-8\n");
+    fprintf( m_file, "LayerCount %d\n", nbLayers );
 
     /* Compute and print the board bounding box */
-    Pcb->ComputeBoundingBox();
-    fprintf( File, "Di %d %d %d %d\n",
-            Pcb->m_BoundaryBox.GetX(), Pcb->m_BoundaryBox.GetY(),
-            Pcb->m_BoundaryBox.GetRight(),
-            Pcb->m_BoundaryBox.GetBottom() );
-
-    fprintf( File, "$EndGENERAL\n\n" );
-    return TRUE;
+    m_pcb->ComputeBoundingBox();
+    fprintf( m_file, "Di %d %d %d %d\n",
+            m_pcb->m_BoundaryBox.GetX(), m_pcb->m_BoundaryBox.GetY(),
+            m_pcb->m_BoundaryBox.GetRight(),
+            m_pcb->m_BoundaryBox.GetBottom() );
+
+    fprintf( m_file, "$EndGENERAL\n\n" );
+    return true;
 }
 
 
@@ -124,17 +189,13 @@ static bool WriteGeneralDescrPcb( BOARD* Pcb, FILE* File )
  * @param LayerLookUpTable = look up table: pcbnew layer for each gerber layer
  * @return 1 if OK, 0 if fail
  */
-static int SavePcbFormatAscii( GERBVIEW_FRAME* frame, FILE* aFile,
-                               int* LayerLookUpTable )
+bool GBR_TO_PCB_EXPORTER::ExportPcb( int* LayerLookUpTable )
 {
     char   line[256];
-    BOARD* gerberPcb = frame->GetBoard();
-    BOARD* pcb;
-
-    wxBeginBusyCursor();
+    BOARD* gerberPcb = m_gerbview_frame->GetBoard();
 
     // create an image of gerber data
-    pcb = new BOARD( NULL, frame );
+    m_pcb = new BOARD( NULL, m_gerbview_frame );
     BOARD_ITEM* item = gerberPcb->m_Drawings;
     for( ; item; item = item->Next() )
     {
@@ -145,105 +206,147 @@ static int SavePcbFormatAscii( GERBVIEW_FRAME* frame, FILE* aFile,
             continue;
 
         if( pcb_layer_number > LAST_COPPER_LAYER )
-        {
-            DRAWSEGMENT* drawitem = new DRAWSEGMENT( pcb, TYPE_DRAWSEGMENT );
-
-            drawitem->SetLayer( pcb_layer_number );
-            drawitem->m_Start = gerb_item->m_Start;
-            drawitem->m_End   = gerb_item->m_End;
-            drawitem->m_Width = gerb_item->m_Size.x;
-
-            if( gerb_item->m_Shape == GBR_ARC )
-            {
-                double cx = gerb_item->m_ArcCentre.x;
-                double cy = gerb_item->m_ArcCentre.y;
-                double a  = atan2( gerb_item->m_Start.y - cy,
-                                   gerb_item->m_Start.x - cx );
-                double b  = atan2( gerb_item->m_End.y - cy, gerb_item->m_End.x - cx );
-
-                drawitem->m_Shape   = S_ARC;
-                drawitem->m_Angle   = (int) fmod(
-                     (a - b) / M_PI * 1800.0 + 3600.0, 3600.0 );
-                drawitem->m_Start.x = (int) cx;
-                drawitem->m_Start.y = (int) cy;
-            }
-
-            pcb->Add( drawitem );
-        }
-        else
-        {
-            TRACK* newtrack;
+            export_non_copper_item( gerb_item, pcb_layer_number );
 
-            // replace spots with vias when possible
-            if( gerb_item->m_Shape == GBR_SPOT_CIRCLE
-                || gerb_item->m_Shape == GBR_SPOT_RECT
-                || gerb_item->m_Shape == GBR_SPOT_OVAL )
-            {
-                newtrack = new SEGVIA( pcb );
-
-                // A spot is found, and can be a via: change it to via, and
-                // delete other
-                // spots at same location
-                newtrack->m_Shape = VIA_THROUGH;
-                newtrack->SetLayer( 0x0F );  // Layers are 0 to 15 (Cu/Cmp)
-                newtrack->SetDrillDefault();
-                newtrack->m_Start = newtrack->m_End = gerb_item->m_Start;
-                newtrack->m_Width = (gerb_item->m_Size.x + gerb_item->m_Size.y) / 2;
-            }
-            else    // a true TRACK
-            {
-                newtrack = new TRACK( pcb );
-                newtrack->SetLayer( pcb_layer_number );
-                newtrack->m_Start = gerb_item->m_Start;
-                newtrack->m_End = gerb_item->m_End;
-                newtrack->m_Width = gerb_item->m_Size.x;
-            }
-
-            pcb->Add( newtrack );
-        }
+        else
+            export_copper_item( gerb_item, pcb_layer_number );
     }
 
-    // delete redundant vias
-    for( TRACK * track = pcb->m_Track; track; track = track->Next() )
-    {
-        if( track->m_Shape != VIA_THROUGH )
-            continue;
+    cleanBoard();
 
-        // Search and delete others vias
-        TRACK* next_track;
-        TRACK* alt_track = track->Next();
-        for( ; alt_track; alt_track = next_track )
-        {
-            next_track = alt_track->Next();
-            if( alt_track->m_Shape != VIA_THROUGH )
-                continue;
+    // Switch the locale to standard C (needed to print floating point numbers)
+    SetLocaleTo_C_standard();
 
-            if( alt_track->m_Start != track->m_Start )
-                continue;
+    // write PCB header
+    fprintf( m_file, "PCBNEW-BOARD Version %d date %s\n\n", g_CurrentVersionPCB,
+            DateAndTime( line ) );
+    WriteGeneralDescrPcb( );
+    WriteSetup( );
 
-            // delete track
-            alt_track->UnLink();
-            delete alt_track;
+    // write items on file
+    m_pcb->Save( m_file );
+
+    SetLocaleTo_Default();       // revert to the current locale
+    return true;
+}
+
+void GBR_TO_PCB_EXPORTER::export_non_copper_item( GERBER_DRAW_ITEM* aGbrItem, int aLayer )
+{
+    DRAWSEGMENT* drawitem = new DRAWSEGMENT( m_pcb, TYPE_DRAWSEGMENT );
+
+    drawitem->SetLayer( aLayer );
+    drawitem->m_Start = aGbrItem->m_Start;
+    drawitem->m_End   = aGbrItem->m_End;
+    drawitem->m_Width = aGbrItem->m_Size.x;
+
+    if( aGbrItem->m_Shape == GBR_ARC )
+    {
+        double a  = atan2( (double)( aGbrItem->m_Start.y - aGbrItem->m_ArcCentre.y),
+                           (double)( aGbrItem->m_Start.x - aGbrItem->m_ArcCentre.x ) );
+        double b  = atan2( (double)( aGbrItem->m_End.y - aGbrItem->m_ArcCentre.y ),
+                            (double)( aGbrItem->m_End.x - aGbrItem->m_ArcCentre.x ) );
+
+        drawitem->m_Shape   = S_ARC;
+        drawitem->m_Angle   = wxRound( (a - b) / M_PI * 1800.0 );
+        drawitem->m_Start = aGbrItem->m_ArcCentre;
+        if( drawitem->m_Angle < 0 )
+        {
+            NEGATE( drawitem->m_Angle );
+            drawitem->m_End = aGbrItem->m_Start;
         }
     }
 
-    // Switch the locale to standard C (needed to print floating point numbers
-    // like 1.3)
-    SetLocaleTo_C_standard();
+    m_pcb->Add( drawitem );
+}
 
-    // write the PCB heading
-    fprintf( aFile, "PCBNEW-BOARD Version %d date %s\n\n", g_CurrentVersionPCB,
-            DateAndTime( line ) );
-    WriteGeneralDescrPcb( pcb, aFile );
-    WriteSetup( aFile, pcb );
+void GBR_TO_PCB_EXPORTER::export_copper_item( GERBER_DRAW_ITEM* aGbrItem, int aLayer )
+{
+    switch( aGbrItem->m_Shape )
+    {
+        case GBR_SPOT_CIRCLE:
+        case GBR_SPOT_RECT:
+        case GBR_SPOT_OVAL:
+            // replace spots with vias when possible
+            export_flashed_copper_item( aGbrItem, aLayer );
+            break;
 
-    // write the useful part of the pcb
-    pcb->Save( aFile );
+        case GBR_ARC:
+//            export_segarc_copper_item( aGbrItem, aLayer );
+            break;
 
-    // the destructor should destroy all owned sub-objects
-    delete pcb;
+        default:
+            export_segline_copper_item( aGbrItem, aLayer );
+            break;
+    }
+}
 
-    SetLocaleTo_Default();       // revert to the current locale
-    wxEndBusyCursor();
-    return 1;
+void GBR_TO_PCB_EXPORTER::export_segline_copper_item( GERBER_DRAW_ITEM* aGbrItem, int aLayer )
+{
+    TRACK * newtrack = new TRACK( m_pcb );
+    newtrack->SetLayer( aLayer );
+    newtrack->m_Start = aGbrItem->m_Start;
+    newtrack->m_End = aGbrItem->m_End;
+    newtrack->m_Width = aGbrItem->m_Size.x;
+    m_pcb->Add( newtrack );
+}
+
+void GBR_TO_PCB_EXPORTER::export_segarc_copper_item( GERBER_DRAW_ITEM* aGbrItem, int aLayer )
+{
+    double a  = atan2( (double)( aGbrItem->m_Start.y - aGbrItem->m_ArcCentre.y ),
+                        (double)( aGbrItem->m_Start.x - aGbrItem->m_ArcCentre.x ) );
+    double b  = atan2( (double)( aGbrItem->m_End.y - aGbrItem->m_ArcCentre.y ),
+                        (double)( aGbrItem->m_End.x - aGbrItem->m_ArcCentre.x ) );
+
+    int arc_angle   = wxRound( ( (a - b) / M_PI * 1800.0 ) );
+    wxPoint start = aGbrItem->m_Start;
+    wxPoint end = aGbrItem->m_End;
+    /* Because Pcbnew does not know arcs in tracks,
+     * approximate arc by segments (16 segment per 360 deg)
+     */
+    #define DELTA 3600/16
+    if( arc_angle < 0 )
+    {
+        NEGATE( arc_angle );
+        EXCHG( start, end );
+    }
+    wxPoint curr_start = start;
+    for( int rot = DELTA; rot < (arc_angle - DELTA); rot += DELTA )
+    {
+        TRACK * newtrack = new TRACK( m_pcb );
+        newtrack->SetLayer( aLayer );
+        newtrack->m_Start = curr_start;
+        wxPoint curr_end = start;
+        RotatePoint( &curr_end, aGbrItem->m_ArcCentre, rot );
+        newtrack->m_End = curr_end;
+        newtrack->m_Width = aGbrItem->m_Size.x;
+        m_pcb->Add( newtrack );
+        curr_start = curr_end;
+    }
+    if( end != curr_start )
+    {
+        TRACK * newtrack = new TRACK( m_pcb );
+        newtrack->SetLayer( aLayer );
+        newtrack->m_Start = curr_start;
+        newtrack->m_End = end;
+        newtrack->m_Width = aGbrItem->m_Size.x;
+        m_pcb->Add( newtrack );
+    }
+}
+
+
+/*
+ * creates a via from a flashed gerber item.
+ * Flashed items are usually pads or vias, so we try to export all of them
+ * using vias
+ */
+void GBR_TO_PCB_EXPORTER::export_flashed_copper_item( GERBER_DRAW_ITEM* aGbrItem, int aLayer )
+{
+    SEGVIA * newtrack = new SEGVIA( m_pcb );
+
+    newtrack->m_Shape = VIA_THROUGH;
+    newtrack->SetLayer( 0x0F );  // Layers are 0 to 15 (Cu/Cmp)
+    newtrack->SetDrillDefault();
+    newtrack->m_Start = newtrack->m_End = aGbrItem->m_Start;
+    newtrack->m_Width = (aGbrItem->m_Size.x + aGbrItem->m_Size.y) / 2;
+    m_pcb->Add( newtrack );
 }

gerbview/select_layers_to_pcb.cpp

@@ -2,16 +2,19 @@
 /* Dialog frame to choose gerber layers and pcb layers */
 /*******************************************************/
 
-/* select_layers_to_pcb.cpp */
+/**
+ * @file select_layers_to_pcb.cpp
+ */
 
 #include "fctsys.h"
 #include "common.h"
 #include "gerbview.h"
 #include "class_board_design_settings.h"
 #include "class_GERBER.h"
-
 #include "wx/statline.h"
 
+#include "dialogs/dialog_layers_select_to_pcb_base.h"
+
 #define LAYER_UNSELECTED NB_LAYERS
 
 static int    ButtonTable[32];       // Indexes buttons to Gerber layers
@@ -25,23 +28,18 @@ enum swap_layer_id {
 };
 
 
-class SWAP_LAYERS_DIALOG : public wxDialog
+class LAYERS_TABLE_DIALOG : public LAYERS_TABLE_DIALOG_BASE
 {
 private:
     GERBVIEW_FRAME*     m_Parent;
-    wxBoxSizer*             OuterBoxSizer;
-    wxBoxSizer*             MainBoxSizer;
-    wxFlexGridSizer*        FlexColumnBoxSizer;
     wxStaticText*           label;
     wxButton*               Button;
     wxStaticText*           text;
-    wxStaticLine*           Line;
-    wxStdDialogButtonSizer* StdDialogButtonSizer;
 
 public:
 
-    SWAP_LAYERS_DIALOG( GERBVIEW_FRAME* parent );
-    ~SWAP_LAYERS_DIALOG() {};
+    LAYERS_TABLE_DIALOG( GERBVIEW_FRAME* parent );
+    ~LAYERS_TABLE_DIALOG() {};
 
 private:
     void OnSelectLayer( wxCommandEvent& event );
@@ -52,12 +50,10 @@ private:
 };
 
 
-BEGIN_EVENT_TABLE( SWAP_LAYERS_DIALOG, wxDialog )
+BEGIN_EVENT_TABLE( LAYERS_TABLE_DIALOG, wxDialog )
     EVT_COMMAND_RANGE( ID_BUTTON_0, ID_BUTTON_0 + 31,
                        wxEVT_COMMAND_BUTTON_CLICKED,
-                       SWAP_LAYERS_DIALOG::OnSelectLayer )
-    EVT_BUTTON( wxID_OK, SWAP_LAYERS_DIALOG::OnOkClick )
-    EVT_BUTTON( wxID_CANCEL, SWAP_LAYERS_DIALOG::OnCancelClick )
+                       LAYERS_TABLE_DIALOG::OnSelectLayer )
 END_EVENT_TABLE()
 
 
@@ -67,30 +63,24 @@ END_EVENT_TABLE()
  */
 int* GERBVIEW_FRAME::InstallDialogLayerPairChoice( )
 {
-    SWAP_LAYERS_DIALOG* frame = new SWAP_LAYERS_DIALOG( this );
+    LAYERS_TABLE_DIALOG* frame = new LAYERS_TABLE_DIALOG( this );
 
     int ii = frame->ShowModal();
 
     frame->Destroy();
-    if( ii >= 0 )
+    if( ii == wxID_OK )
         return LayerLookUpTable;
     else
         return NULL;
 }
 
 
-SWAP_LAYERS_DIALOG::SWAP_LAYERS_DIALOG( GERBVIEW_FRAME* parent ) :
-    wxDialog( parent, -1, _( "Layer selection:" ), wxPoint( -1, -1 ),
-              wxDefaultSize, wxDEFAULT_DIALOG_STYLE | MAYBE_RESIZE_BORDER )
+LAYERS_TABLE_DIALOG::LAYERS_TABLE_DIALOG( GERBVIEW_FRAME* parent ) :
+    LAYERS_TABLE_DIALOG_BASE( parent )
 {
-    OuterBoxSizer = NULL;
-    MainBoxSizer  = NULL;
-    FlexColumnBoxSizer = NULL;
     label  = NULL;
     Button = NULL;
     text   = NULL;
-    Line   = NULL;
-    StdDialogButtonSizer = NULL;
 
     m_Parent = parent;
 
@@ -118,113 +108,90 @@ SWAP_LAYERS_DIALOG::SWAP_LAYERS_DIALOG( GERBVIEW_FRAME* parent ) :
     // buttons should be some other size in that version.
 
     // Compute a reasonable number of copper layers
-    int pcb_layer_number = 0;
+    int pcb_copper_layer_count = 0;
     for( ii = 0; ii < 32; ii++ )
     {
         if( g_GERBER_List[ii] != NULL )
-            pcb_layer_number++;
+            pcb_copper_layer_count++;
 
         // Specify the default value for each member of these arrays.
         ButtonTable[ii] = -1;
         LayerLookUpTable[ii] = LAYER_UNSELECTED;
     }
-    m_Parent->GetBoard()->SetCopperLayerCount(pcb_layer_number);
 
-    pcb_layer_number = 0;
+    // Ensure we have at least 2 copper layers and NB_COPPER_LAYERS copper layers max
+    if( pcb_copper_layer_count < 2 )
+        pcb_copper_layer_count = 2;
+    if( pcb_copper_layer_count > NB_COPPER_LAYERS )
+        pcb_copper_layer_count = NB_COPPER_LAYERS;
+    m_Parent->GetBoard()->SetCopperLayerCount(pcb_copper_layer_count);
+
+    int pcb_layer_num = 0;
     for( nb_items = 0, ii = 0; ii < 32; ii++ )
     {
         if( g_GERBER_List[ii] == NULL )
             continue;
 
-        if( (pcb_layer_number == m_Parent->GetBoard()->GetCopperLayerCount() - 1)
+        if( (pcb_layer_num == m_Parent->GetBoard()->GetCopperLayerCount() - 1)
            && (m_Parent->GetBoard()->GetCopperLayerCount() > 1) )
-            pcb_layer_number = LAYER_N_FRONT;
+            pcb_layer_num = LAYER_N_FRONT;
 
         ButtonTable[nb_items] = ii;
-        LayerLookUpTable[ii]  = pcb_layer_number;
+        LayerLookUpTable[ii]  = pcb_layer_num;
         nb_items++;
-        pcb_layer_number++;
+        pcb_layer_num++;
     }
 
-    OuterBoxSizer = new wxBoxSizer( wxVERTICAL );
-    SetSizer( OuterBoxSizer );
-
-    MainBoxSizer = new wxBoxSizer( wxHORIZONTAL );
-    OuterBoxSizer->Add( MainBoxSizer, 1, wxGROW | wxLEFT | wxRIGHT | wxTOP, 5 );
+    if( nb_items <= 16 )
+        m_staticlineSep->Hide();
 
+    wxFlexGridSizer* flexColumnBoxSizer = m_flexLeftColumnBoxSizer;
     for( ii = 0; ii < nb_items; ii++ )
     {
-        // If more than 16 Gerber layers are used, provide a vertical line to
-        // separate the two FlexGrid sizers
-        if( (nb_items > 16) && (ii == 16) )
-        {
-            Line = new wxStaticLine( this, -1, wxDefaultPosition, wxDefaultSize,
-                                     wxLI_VERTICAL );
-            MainBoxSizer->Add( Line, 0, wxGROW | wxLEFT | wxRIGHT, 5 );
-        }
-
-        // Provide a separate FlexGrid sizer for every sixteen sets of controls
-        if( ii % 16 == 0 )
-        {
-            // Each Gerber layer has an associated static text string (to
-            // identify that layer), a button (for invoking a child dialog
-            // box to change which pcbnew layer that the Gerber layer is
-            // mapped to), and a second static text string (to depict which
-            // pcbnew layer that the Gerber layer has been mapped to). Each
-            // of those items are placed into the left hand column, middle
-            // column, and right hand column (respectively) of the Flexgrid
-            // sizer, and the color of the second text string is set to
-            // fuchsia or blue (to respectively indicate whether the Gerber
-            // layer has been mapped to a pcbnew layer or is not being
-            // exported at all).  (Experimentation has shown that if a text
-            // control is used to depict which pcbnew layer that each Gerber
-            // layer is mapped to (instead of a static text string), then
-            // those controls do not behave in a fully satisfactory manner
-            // in the Linux version. Even when the read-only attribute is
-            // specified for all of those controls, they can still be selected
-            // when the arrow keys or Tab key is used to step through all of
-            // the controls within the dialog box, and directives to set the
-            // foreground color of the text of each such control to blue (to
-            // indicate that the text is of a read-only nature) are disregarded.
-            // Specify a FlexGrid sizer with an appropriate number of rows
-            // and three columns.  If nb_items < 16, then the number of rows
-            // is nb_items; otherwise, the number of rows is 16 (with two
-            // separate columns of controls being used if nb_items > 16).
-
-            if( nb_items < 16 )
-                FlexColumnBoxSizer = new wxFlexGridSizer( nb_items, 4, 0, 0 );
-            else
-                FlexColumnBoxSizer = new wxFlexGridSizer( 16, 4, 0, 0 );
-
-            // Specify that all of the rows can be expanded.
-            for( int jj = 0; jj < MIN( nb_items, 16 ); jj++ )
-            {
-                FlexColumnBoxSizer->AddGrowableRow( jj );
-            }
-
-            // Specify that (just) the right-hand column can be expanded.
-            FlexColumnBoxSizer->AddGrowableCol( 2 );
-
-            MainBoxSizer->Add( FlexColumnBoxSizer, 1, wxGROW | wxTOP, 5 );
-        }
+        // Each Gerber layer has an associated static text string (to
+        // identify that layer), a button (for invoking a child dialog
+        // box to change which pcbnew layer that the Gerber layer is
+        // mapped to), and a second static text string (to depict which
+        // pcbnew layer that the Gerber layer has been mapped to). Each
+        // of those items are placed into the left hand column, middle
+        // column, and right hand column (respectively) of the Flexgrid
+        // sizer, and the color of the second text string is set to
+        // fuchsia or blue (to respectively indicate whether the Gerber
+        // layer has been mapped to a pcbnew layer or is not being
+        // exported at all).  (Experimentation has shown that if a text
+        // control is used to depict which pcbnew layer that each Gerber
+        // layer is mapped to (instead of a static text string), then
+        // those controls do not behave in a fully satisfactory manner
+        // in the Linux version. Even when the read-only attribute is
+        // specified for all of those controls, they can still be selected
+        // when the arrow keys or Tab key is used to step through all of
+        // the controls within the dialog box, and directives to set the
+        // foreground color of the text of each such control to blue (to
+        // indicate that the text is of a read-only nature) are disregarded.
+        // Specify a FlexGrid sizer with an appropriate number of rows
+        // and three columns.  If nb_items < 16, then the number of rows
+        // is nb_items; otherwise, the number of rows is 16 (with two
+        // separate columns of controls being used if nb_items > 16).
+
+        if( ii == 16 )
+            flexColumnBoxSizer = m_flexRightColumnBoxSizer;
 
         // Provide a text string to identify the Gerber layer
-        msg = _( "Layer " );
-        msg << ButtonTable[ii] + 1;
+        msg.Printf( _( "Layer %d" ), ButtonTable[ii] + 1 );
 
         label = new wxStaticText( this, wxID_STATIC, msg, wxDefaultPosition,
                                   wxDefaultSize, wxALIGN_RIGHT );
-        FlexColumnBoxSizer->Add( label, 0,
+        flexColumnBoxSizer->Add( label, 0,
                                  wxALIGN_RIGHT | wxALIGN_CENTER_VERTICAL |
-                                 wxALL, 5 );
+                                 wxRIGHT|wxLEFT, 5 );
 
         /* Add file name and extension without path. */
         wxFileName fn( g_GERBER_List[ii]->m_FileName );
         label = new wxStaticText( this, wxID_STATIC, fn.GetFullName(),
                                   wxDefaultPosition, wxDefaultSize );
-        FlexColumnBoxSizer->Add( label, 0,
+        flexColumnBoxSizer->Add( label, 0,
                                  wxALIGN_RIGHT | wxALIGN_CENTER_VERTICAL |
-                                 wxALL, 5 );
+                                 wxRIGHT|wxLEFT, 5 );
 
         // Provide a button for this layer (which will invoke a child dialog box)
         item_ID = ID_BUTTON_0 + ii;
@@ -232,9 +199,9 @@ SWAP_LAYERS_DIALOG::SWAP_LAYERS_DIALOG( GERBVIEW_FRAME* parent ) :
         Button = new wxButton( this, item_ID, wxT( "..." ),
                                wxDefaultPosition, wxSize( w, h ), 0 );
 
-        FlexColumnBoxSizer->Add( Button, 0,
+        flexColumnBoxSizer->Add( Button, 0,
                                  wxALIGN_LEFT | wxALIGN_CENTER_VERTICAL |
-                                 wxALL, 5 );
+                                 wxRIGHT|wxLEFT, 5 );
 
         // Provide another text string to specify which pcbnew layer that this
         // Gerber layer is initially mapped to, and set the initial text to
@@ -273,57 +240,20 @@ SWAP_LAYERS_DIALOG::SWAP_LAYERS_DIALOG( GERBVIEW_FRAME* parent ) :
                                      wxDefaultSize, 0 );
         }
         text->SetMinSize( goodSize );
-        FlexColumnBoxSizer->Add( text, 1,
-                                 wxALIGN_LEFT | wxALIGN_CENTER_VERTICAL | wxALL,
+        flexColumnBoxSizer->Add( text, 1,
+                                 wxALIGN_LEFT | wxALIGN_CENTER_VERTICAL | wxRIGHT| wxLEFT,
                                  5 );
 
         layer_list[ii] = text;
     }
 
-    // If required, provide spacers to occupy otherwise blank cells within the
-    // second FlexGrid sizer. (As it incorporates three columns, three spacers
-    // are thus required for each otherwise unused row.)
-    if( 16 < nb_items && nb_items < 32 )
-    {
-        for( ii = 4 * nb_items; ii < 96; ii++ )
-        {
-            FlexColumnBoxSizer->Add( 5, h, 0,
-                                     wxALIGN_CENTER_HORIZONTAL |
-                                     wxALIGN_CENTER_VERTICAL | wxLEFT |
-                                     wxRIGHT | wxBOTTOM, 5 );
-        }
-    }
-
-    // Provide a line to separate the controls which have been provided so far
-    // from the OK and Cancel buttons (which will be provided after this line)
-    Line = new wxStaticLine( this, -1, wxDefaultPosition, wxDefaultSize,
-                             wxLI_HORIZONTAL );
-    OuterBoxSizer->Add( Line, 0, wxGROW | wxLEFT | wxRIGHT | wxTOP, 5 );
-
-    // Provide a StdDialogButtonSizer to accommodate the OK and Cancel buttons;
-    // using that type of sizer results in those buttons being automatically
-    // located in positions appropriate for each (OS) version of KiCad.
-    StdDialogButtonSizer = new wxStdDialogButtonSizer;
-    OuterBoxSizer->Add( StdDialogButtonSizer, 0, wxGROW | wxALL, 10 );
-
-    Button = new wxButton( this, wxID_OK, _( "&OK" ), wxDefaultPosition,
-                           wxDefaultSize, 0 );
-    StdDialogButtonSizer->AddButton( Button );
-
-    Button = new wxButton( this, wxID_CANCEL, _( "&Cancel" ),
-                           wxDefaultPosition, wxDefaultSize, 0 );
-    StdDialogButtonSizer->AddButton( Button );
-    StdDialogButtonSizer->Realize();
-
     // Resize the dialog
-    if( GetSizer() )
-    {
-        GetSizer()->SetSizeHints( this );
-    }
+    GetSizer()->SetSizeHints( this );
+    Centre();
 }
 
 
-void SWAP_LAYERS_DIALOG::OnSelectLayer( wxCommandEvent& event )
+void LAYERS_TABLE_DIALOG::OnSelectLayer( wxCommandEvent& event )
 {
     int ii, jj;
 
@@ -365,13 +295,13 @@ void SWAP_LAYERS_DIALOG::OnSelectLayer( wxCommandEvent& event )
 }
 
 
-void SWAP_LAYERS_DIALOG::OnCancelClick( wxCommandEvent& event )
+void LAYERS_TABLE_DIALOG::OnCancelClick( wxCommandEvent& event )
 {
-    EndModal( -1 );
+    EndModal( wxID_CANCEL );
 }
 
 
-void SWAP_LAYERS_DIALOG::OnOkClick( wxCommandEvent& event )
+void LAYERS_TABLE_DIALOG::OnOkClick( wxCommandEvent& event )
 {
     int  ii;
     bool AsCmpLayer = false;
@@ -395,10 +325,14 @@ void SWAP_LAYERS_DIALOG::OnOkClick( wxCommandEvent& event )
 
     if( AsCmpLayer )
         layers_count++;
+
     if( layers_count > NB_COPPER_LAYERS ) // should not occur.
         layers_count = NB_COPPER_LAYERS;
 
+    if( layers_count < 2 )
+        layers_count = 2;
+
     m_Parent->GetBoard()->SetCopperLayerCount( layers_count );
 
-    EndModal( 1 );
+    EndModal( wxID_OK );
 }