C++ EDA_RECT::SetSize方法代码示例

int SCH_SCREEN::UpdatePickList()
{
    ITEM_PICKER picker;
    EDA_RECT area;
    unsigned count;

    area.SetOrigin( m_BlockLocate.GetOrigin() );
    area.SetSize( m_BlockLocate.GetSize() );
    area.Normalize();

    for( SCH_ITEM* item = m_drawList.begin(); item; item = item->Next() )
    {
        // An item is picked if its bounding box intersects the reference area.
        if( item->HitTest( area ) )
        {
            picker.SetItem( item );
            m_BlockLocate.PushItem( picker );
        }
    }

    // if the block is composed of one item,
    // select it as the current item
    count =  m_BlockLocate.GetCount();
    if( count == 1 )
    {
        SetCurItem( (SCH_ITEM*) m_BlockLocate.GetItem( 0 ) );
    }
    else
    {
        SetCurItem( NULL );
    }

    return count;
}

double GERBVIEW_FRAME::BestZoom()
{
    EDA_RECT bbox = GetGerberLayout()->ComputeBoundingBox();

    // gives a size to bbox (current page size), if no item in list
    if( bbox.GetWidth() == 0 || bbox.GetHeight() == 0 )
    {
        wxSize pagesize = GetPageSettings().GetSizeMils();
        bbox.SetSize( wxSize( Mils2iu( pagesize.x ), Mils2iu( pagesize.y ) ) );
    }

    // Compute best zoom:
    wxSize  size = m_canvas->GetClientSize();
    double  x   = (double) bbox.GetWidth() / (double) size.x;
    double  y   = (double) bbox.GetHeight() / (double) size.y;
    double  best_zoom = std::max( x, y ) * 1.1;

    SetScrollCenterPosition( bbox.Centre() );

    return best_zoom;
}

const EDA_RECT D_PAD::GetBoundingBox() const
{
    EDA_RECT area;
    wxPoint quadrant1, quadrant2, quadrant3, quadrant4;
    int x, y, dx, dy;

    switch( GetShape() )
    {
    case PAD_SHAPE_CIRCLE:
        area.SetOrigin( m_Pos );
        area.Inflate( m_Size.x / 2 );
        break;

    case PAD_SHAPE_OVAL:
        //Use the maximal two most distant points and track their rotation
        // (utilise symmetry to avoid four points)
        quadrant1.x =  m_Size.x/2;
        quadrant1.y =  0;
        quadrant2.x =  0;
        quadrant2.y =  m_Size.y/2;

        RotatePoint( &quadrant1, m_Orient );
        RotatePoint( &quadrant2, m_Orient );
        dx = std::max( std::abs( quadrant1.x ) , std::abs( quadrant2.x )  );
        dy = std::max( std::abs( quadrant1.y ) , std::abs( quadrant2.y )  );
        area.SetOrigin( m_Pos.x-dx, m_Pos.y-dy );
        area.SetSize( 2*dx, 2*dy );
        break;

    case PAD_SHAPE_RECT:
        //Use two corners and track their rotation
        // (utilise symmetry to avoid four points)
        quadrant1.x =  m_Size.x/2;
        quadrant1.y =  m_Size.y/2;
        quadrant2.x = -m_Size.x/2;
        quadrant2.y =  m_Size.y/2;

        RotatePoint( &quadrant1, m_Orient );
        RotatePoint( &quadrant2, m_Orient );
        dx = std::max( std::abs( quadrant1.x ) , std::abs( quadrant2.x )  );
        dy = std::max( std::abs( quadrant1.y ) , std::abs( quadrant2.y )  );
        area.SetOrigin( m_Pos.x-dx, m_Pos.y-dy );
        area.SetSize( 2*dx, 2*dy );
        break;

    case PAD_SHAPE_TRAPEZOID:
        //Use the four corners and track their rotation
        // (Trapezoids will not be symmetric)
        quadrant1.x =  (m_Size.x + m_DeltaSize.y)/2;
        quadrant1.y =  (m_Size.y - m_DeltaSize.x)/2;
        quadrant2.x = -(m_Size.x + m_DeltaSize.y)/2;
        quadrant2.y =  (m_Size.y + m_DeltaSize.x)/2;
        quadrant3.x = -(m_Size.x - m_DeltaSize.y)/2;
        quadrant3.y = -(m_Size.y + m_DeltaSize.x)/2;
        quadrant4.x =  (m_Size.x - m_DeltaSize.y)/2;
        quadrant4.y = -(m_Size.y - m_DeltaSize.x)/2;

        RotatePoint( &quadrant1, m_Orient );
        RotatePoint( &quadrant2, m_Orient );
        RotatePoint( &quadrant3, m_Orient );
        RotatePoint( &quadrant4, m_Orient );

        x  = std::min( quadrant1.x, std::min( quadrant2.x, std::min( quadrant3.x, quadrant4.x) ) );
        y  = std::min( quadrant1.y, std::min( quadrant2.y, std::min( quadrant3.y, quadrant4.y) ) );
        dx = std::max( quadrant1.x, std::max( quadrant2.x, std::max( quadrant3.x, quadrant4.x) ) );
        dy = std::max( quadrant1.y, std::max( quadrant2.y, std::max( quadrant3.y, quadrant4.y) ) );
        area.SetOrigin( m_Pos.x+x, m_Pos.y+y );
        area.SetSize( dx-x, dy-y );
        break;

    default:
        break;
    }

    return area;
}

EDA_RECT EDA_TEXT::GetTextBox( int aLine, int aThickness, bool aInvertY ) const
{
    EDA_RECT       rect;
    wxPoint        pos;
    wxArrayString  strings;
    wxString       text = GetShownText();
    int            thickness = ( aThickness < 0 ) ? m_Thickness : aThickness;
    int            linecount = 1;

    if( m_MultilineAllowed )
    {
        wxStringSplit( text, strings, '\n' );

        if ( strings.GetCount() )     // GetCount() == 0 for void strings
        {
            if( aLine >= 0 && (aLine < (int)strings.GetCount()) )
                text = strings.Item( aLine );
            else
                text = strings.Item( 0 );

            linecount = strings.GetCount();
        }
    }

    // calculate the H and V size
    int    dx = LenSize( text );
    int    dy = GetInterline( aThickness );

    // Creates bounding box (rectangle) for an horizontal text
    wxSize textsize = wxSize( dx, dy );

    if( aInvertY )
        rect.SetOrigin( m_Pos.x, -m_Pos.y );
    else
        rect.SetOrigin( m_Pos );

    // extra dy interval for letters like j and y and ]
    int extra_dy = dy - m_Size.y;
    rect.Move( wxPoint( 0, -extra_dy / 2 ) ); // move origin by the half extra interval

    // for multiline texts and aLine < 0, merge all rectangles
    if( m_MultilineAllowed && aLine < 0 )
    {
        for( unsigned ii = 1; ii < strings.GetCount(); ii++ )
        {
            text = strings.Item( ii );
            dx   = LenSize( text );
            textsize.x  = std::max( textsize.x, dx );
            textsize.y += dy;
        }
    }

    rect.SetSize( textsize );

    /* Now, calculate the rect origin, according to text justification
     * At this point the rectangle origin is the text origin (m_Pos).
     * This is true only for left and top text justified texts (using top to bottom Y axis
     * orientation). and must be recalculated for others justifications
     * also, note the V justification is relative to the first line
     */
    switch( m_HJustify )
    {
    case GR_TEXT_HJUSTIFY_LEFT:
        if( m_Mirror )
            rect.SetX( rect.GetX() - rect.GetWidth() );
        break;

    case GR_TEXT_HJUSTIFY_CENTER:
        rect.SetX( rect.GetX() - (rect.GetWidth() / 2) );
        break;

    case GR_TEXT_HJUSTIFY_RIGHT:
        if( !m_Mirror )
            rect.SetX( rect.GetX() - rect.GetWidth() );
        break;
    }

    dy = m_Size.y + thickness;

    switch( m_VJustify )
    {
    case GR_TEXT_VJUSTIFY_TOP:
        break;

    case GR_TEXT_VJUSTIFY_CENTER:
        rect.SetY( rect.GetY() - ( dy / 2) );
        break;

    case GR_TEXT_VJUSTIFY_BOTTOM:
        rect.SetY( rect.GetY() - dy );
        break;
    }

    if( linecount > 1 )
    {
        int yoffset;
        linecount -= 1;

        switch( m_VJustify )
        {
//.........这里部分代码省略.........

void BOARD_PRINTOUT_CONTROLLER::DrawPage()
{
    wxPoint       offset;
    double        userscale;
    EDA_RECT      boardBoundingBox;
    EDA_RECT      drawRect;
    wxDC*         dc = GetDC();
    BASE_SCREEN*  screen = m_Parent->GetScreen();
    bool          printMirror = m_PrintParams.m_PrintMirror;
    wxSize        pageSizeIU = m_Parent->GetPageSizeIU();

    wxBusyCursor  dummy;

#if defined (PCBNEW)
    BOARD * brd = ((PCB_BASE_FRAME*) m_Parent)->GetBoard();
    boardBoundingBox = brd->ComputeBoundingBox();
    wxString titleblockFilename = brd->GetFileName();
#elif defined (GERBVIEW)
    boardBoundingBox = ((GERBVIEW_FRAME*) m_Parent)->GetGerberLayoutBoundingBox();
    wxString titleblockFilename;    // TODO see if we uses the gerber file name
#else
    #error BOARD_PRINTOUT_CONTROLLER::DrawPage() works only for PCBNEW or GERBVIEW
#endif

    // Use the page size as the drawing area when the board is shown or the user scale
    // is less than 1.
    if( m_PrintParams.PrintBorderAndTitleBlock() )
        boardBoundingBox = EDA_RECT( wxPoint( 0, 0 ), pageSizeIU );

    wxLogTrace( tracePrinting, wxT( "Drawing bounding box:                 x=%d, y=%d, w=%d, h=%d" ),
                boardBoundingBox.GetX(), boardBoundingBox.GetY(),
                boardBoundingBox.GetWidth(), boardBoundingBox.GetHeight() );

    // Compute the PCB size in internal units
    userscale = m_PrintParams.m_PrintScale;

    if( m_PrintParams.m_PrintScale == 0 )   //  fit in page option
    {
        if(boardBoundingBox.GetWidth() && boardBoundingBox.GetHeight())
        {
            int margin = Millimeter2iu( 10.0 ); // add a margin around the drawings
            double scaleX = (double)(pageSizeIU.x - (2 * margin)) /
                            boardBoundingBox.GetWidth();
            double scaleY = (double)(pageSizeIU.y - (2 * margin)) /
                            boardBoundingBox.GetHeight();
            userscale = (scaleX < scaleY) ? scaleX : scaleY;
        }
        else
            userscale = 1.0;
    }

    wxSize scaledPageSize = pageSizeIU;
    drawRect.SetSize( scaledPageSize );
    scaledPageSize.x = wxRound( scaledPageSize.x / userscale );
    scaledPageSize.y = wxRound( scaledPageSize.y / userscale );


    if( m_PrintParams.m_PageSetupData )
    {
        wxLogTrace( tracePrinting, wxT( "Fit size to page margins:         x=%d, y=%d" ),
                    scaledPageSize.x, scaledPageSize.y );

        // Always scale to the size of the paper.
        FitThisSizeToPageMargins( scaledPageSize, *m_PrintParams.m_PageSetupData );
    }

    // Compute Accurate scale 1
    if( m_PrintParams.m_PrintScale == 1.0 )
    {
        // We want a 1:1 scale, regardless the page setup
        // like page size, margin ...
        MapScreenSizeToPaper(); // set best scale and offset (scale is not used)
        int w, h;
        GetPPIPrinter( &w, &h );
        double accurate_Xscale = (double) w / (IU_PER_MILS*1000);
        double accurate_Yscale = (double) h / (IU_PER_MILS*1000);

        if( IsPreview() )  // Scale must take in account the DC size in Preview
        {
            // Get the size of the DC in pixels
            wxSize       PlotAreaSize;
            dc->GetSize( &PlotAreaSize.x, &PlotAreaSize.y );
            GetPageSizePixels( &w, &h );
            accurate_Xscale *= (double)PlotAreaSize.x / w;
            accurate_Yscale *= (double)PlotAreaSize.y / h;
        }
        // Fine scale adjust
        accurate_Xscale *= m_PrintParams.m_XScaleAdjust;
        accurate_Yscale *= m_PrintParams.m_YScaleAdjust;

        // Set print scale for 1:1 exact scale
        dc->SetUserScale( accurate_Xscale, accurate_Yscale );
    }

    // Get the final size of the DC in pixels
    wxSize       PlotAreaSizeInPixels;
    dc->GetSize( &PlotAreaSizeInPixels.x, &PlotAreaSizeInPixels.y );
    wxLogTrace( tracePrinting, wxT( "Plot area in pixels:              x=%d, y=%d" ),
                PlotAreaSizeInPixels.x, PlotAreaSizeInPixels.y );
    double scalex, scaley;
//.........这里部分代码省略.........

//.........这里部分代码省略.........
        {

        wxPoint poly[4];
        BuildPadPolygon( poly, wxSize( 0, 0 ), 0 );

        wxPoint corners[4];

        corners[0] = wxPoint( arect.GetLeft(),  arect.GetTop() );
        corners[1] = wxPoint( arect.GetRight(), arect.GetTop() );
        corners[2] = wxPoint( arect.GetRight(), arect.GetBottom() );
        corners[3] = wxPoint( arect.GetLeft(),  arect.GetBottom() );

        for( int i=0; i<4; i++ )
        {
            RotatePoint( &poly[i], m_Orient );
            poly[i] += shapePos;
        }

        for( int ii=0; ii<4; ii++ )
        {
            if( TestPointInsidePolygon( poly, 4, corners[ii] ) )
            {
                return true;
            }

            if( arect.Contains( poly[ii] ) )
            {
                return true;
            }

            if( arect.Intersects( poly[ii], poly[(ii+1) % 4] ) )
            {
                return true;
            }
        }

        return false;

        }
    case PAD_SHAPE_ROUNDRECT:
        /* RoundRect intersection can be broken up into simple tests:
         * a) Test intersection of horizontal rect
         * b) Test intersection of vertical rect
         * c) Test intersection of each corner
         */


        r = GetRoundRectCornerRadius();

        /* Test A - intersection of horizontal rect */
        shapeRect.SetSize( 0, 0 );
        shapeRect.SetOrigin( shapePos );
        shapeRect.Inflate( m_Size.x / 2, m_Size.y / 2 - r );

        // Short-circuit test for zero width or height
        if( shapeRect.GetWidth() > 0 && shapeRect.GetHeight() > 0 &&
            arect.Intersects( shapeRect, m_Orient ) )
        {
            return true;
        }

        /* Test B - intersection of vertical rect */
        shapeRect.SetSize( 0, 0 );
        shapeRect.SetOrigin( shapePos );
        shapeRect.Inflate( m_Size.x / 2 - r, m_Size.y / 2 );

        // Short-circuit test for zero width or height
        if( shapeRect.GetWidth() > 0 && shapeRect.GetHeight() > 0 &&
            arect.Intersects( shapeRect, m_Orient ) )
        {
            return true;
        }

        /* Test C - intersection of each corner */

        endCenter = wxPoint( m_Size.x / 2 - r, m_Size.y / 2 - r );
        RotatePoint( &endCenter, m_Orient );

        if( arect.IntersectsCircle( shapePos + endCenter, r ) ||
            arect.IntersectsCircle( shapePos - endCenter, r ) )
        {
            return true;
        }

        endCenter = wxPoint( m_Size.x / 2 - r, -m_Size.y / 2 + r );
        RotatePoint( &endCenter, m_Orient );

        if( arect.IntersectsCircle( shapePos + endCenter, r ) ||
            arect.IntersectsCircle( shapePos - endCenter, r ) )
        {
            return true;
        }

        break;
    default:
        break;
    }

    return false;
}

const EDA_RECT D_PAD::GetBoundingBox() const
{
    EDA_RECT area;
    wxPoint quadrant1, quadrant2, quadrant3, quadrant4;
    int x, y, r, dx, dy;

    wxPoint center = ShapePos();
    wxPoint endPoint;

    EDA_RECT endRect;

    switch( GetShape() )
    {
    case PAD_SHAPE_CIRCLE:
        area.SetOrigin( center );
        area.Inflate( m_Size.x / 2 );
        break;

    case PAD_SHAPE_OVAL:
        /* To get the BoundingBox of an oval pad:
         * a) If the pad is ROUND, see method for PAD_SHAPE_CIRCLE above
         * OTHERWISE:
         * b) Construct EDA_RECT for portion between circular ends
         * c) Rotate that EDA_RECT
         * d) Add the circular ends to the EDA_RECT
         */

        // Test if the shape is circular
        if( m_Size.x == m_Size.y )
        {
            area.SetOrigin( center );
            area.Inflate( m_Size.x / 2 );
            break;
        }

        if( m_Size.x > m_Size.y )
        {
            // Pad is horizontal
            dx = ( m_Size.x - m_Size.y ) / 2;
            dy = m_Size.y / 2;

            // Location of end-points
            x = dx;
            y = 0;
            r = dy;
        }
        else
        {
            // Pad is vertical
            dx = m_Size.x / 2;
            dy = ( m_Size.y - m_Size.x ) / 2;

            x = 0;
            y = dy;
            r = dx;
        }

        // Construct the center rectangle and rotate
        area.SetOrigin( center );
        area.Inflate( dx, dy );
        area = area.GetBoundingBoxRotated( center, m_Orient );

        endPoint = wxPoint( x, y );
        RotatePoint( &endPoint, m_Orient );

        // Add points at each quadrant of circular regions
        endRect.SetOrigin( center + endPoint );
        endRect.Inflate( r );

        area.Merge( endRect );

        endRect.SetSize( 0, 0 );
        endRect.SetOrigin( center - endPoint );
        endRect.Inflate( r );

        area.Merge( endRect );

        break;

    case PAD_SHAPE_RECT:
    case PAD_SHAPE_ROUNDRECT:
        // Use two opposite corners and track their rotation
        // (use symmetry for other points)
        quadrant1.x =  m_Size.x/2;
        quadrant1.y =  m_Size.y/2;
        quadrant2.x = -m_Size.x/2;
        quadrant2.y =  m_Size.y/2;

        RotatePoint( &quadrant1, m_Orient );
        RotatePoint( &quadrant2, m_Orient );
        dx = std::max( std::abs( quadrant1.x ) , std::abs( quadrant2.x )  );
        dy = std::max( std::abs( quadrant1.y ) , std::abs( quadrant2.y )  );

        // Set the bbox
        area.SetOrigin( ShapePos() );
        area.Inflate( dx, dy );
        break;

    case PAD_SHAPE_TRAPEZOID:
        // Use the four corners and track their rotation
//.........这里部分代码省略.........

const EDA_RECT D_PAD::GetBoundingBox() const
{
    EDA_RECT area;
    wxPoint quadrant1, quadrant2, quadrant3, quadrant4;
    int x, y, dx, dy;

    switch( GetShape() )
    {
    case PAD_SHAPE_CIRCLE:
        area.SetOrigin( m_Pos );
        area.Inflate( m_Size.x / 2 );
        break;

    case PAD_SHAPE_OVAL:
        // Calculate the position of each rounded ent
        quadrant1.x =  m_Size.x/2;
        quadrant1.y =  0;
        quadrant2.x =  0;
        quadrant2.y =  m_Size.y/2;

        RotatePoint( &quadrant1, m_Orient );
        RotatePoint( &quadrant2, m_Orient );

        // Calculate the max position of each end, relative to the pad position
        // (the min position is symetrical)
        dx = std::max( std::abs( quadrant1.x ) , std::abs( quadrant2.x )  );
        dy = std::max( std::abs( quadrant1.y ) , std::abs( quadrant2.y )  );

        // Set the bbox
        area.SetOrigin( m_Pos );
        area.Inflate( dx, dy );
        break;

    case PAD_SHAPE_RECT:
    case PAD_SHAPE_ROUNDRECT:
        // Use two opposite corners and track their rotation
        // (use symmetry for other points)
        quadrant1.x =  m_Size.x/2;
        quadrant1.y =  m_Size.y/2;
        quadrant2.x = -m_Size.x/2;
        quadrant2.y =  m_Size.y/2;

        RotatePoint( &quadrant1, m_Orient );
        RotatePoint( &quadrant2, m_Orient );
        dx = std::max( std::abs( quadrant1.x ) , std::abs( quadrant2.x )  );
        dy = std::max( std::abs( quadrant1.y ) , std::abs( quadrant2.y )  );

        // Set the bbox
        area.SetOrigin( m_Pos );
        area.Inflate( dx, dy );
        break;

    case PAD_SHAPE_TRAPEZOID:
        //Use the four corners and track their rotation
        // (Trapezoids will not be symmetric)
        quadrant1.x =  (m_Size.x + m_DeltaSize.y)/2;
        quadrant1.y =  (m_Size.y - m_DeltaSize.x)/2;
        quadrant2.x = -(m_Size.x + m_DeltaSize.y)/2;
        quadrant2.y =  (m_Size.y + m_DeltaSize.x)/2;
        quadrant3.x = -(m_Size.x - m_DeltaSize.y)/2;
        quadrant3.y = -(m_Size.y + m_DeltaSize.x)/2;
        quadrant4.x =  (m_Size.x - m_DeltaSize.y)/2;
        quadrant4.y = -(m_Size.y - m_DeltaSize.x)/2;

        RotatePoint( &quadrant1, m_Orient );
        RotatePoint( &quadrant2, m_Orient );
        RotatePoint( &quadrant3, m_Orient );
        RotatePoint( &quadrant4, m_Orient );

        x  = std::min( quadrant1.x, std::min( quadrant2.x, std::min( quadrant3.x, quadrant4.x) ) );
        y  = std::min( quadrant1.y, std::min( quadrant2.y, std::min( quadrant3.y, quadrant4.y) ) );
        dx = std::max( quadrant1.x, std::max( quadrant2.x, std::max( quadrant3.x, quadrant4.x) ) );
        dy = std::max( quadrant1.y, std::max( quadrant2.y, std::max( quadrant3.y, quadrant4.y) ) );
        area.SetOrigin( m_Pos.x+x, m_Pos.y+y );
        area.SetSize( dx-x, dy-y );
        break;

    default:
        break;
    }

    return area;
}

void BOARD_PRINTOUT_CONTROLLER::DrawPage()
{
    wxPoint       offset;
    double        userscale;
    EDA_RECT      boardBoundingBox;
    EDA_RECT      drawRect;
    wxDC*         dc = GetDC();
    BASE_SCREEN*  screen = m_Parent->GetScreen();
    bool          printMirror = m_PrintParams.m_PrintMirror;
    wxSize        pageSizeIU = m_Parent->GetPageSizeIU();

    wxBusyCursor  dummy;

    boardBoundingBox = ((GERBVIEW_FRAME*) m_Parent)->GetGerberLayoutBoundingBox();
    wxString titleblockFilename;    // TODO see if we uses the gerber file name

    // Use the page size as the drawing area when the board is shown or the user scale
    // is less than 1.
    if( m_PrintParams.PrintBorderAndTitleBlock() )
        boardBoundingBox = EDA_RECT( wxPoint( 0, 0 ), pageSizeIU );

    // Compute the PCB size in internal units
    userscale = m_PrintParams.m_PrintScale;

    if( m_PrintParams.m_PrintScale == 0 )   //  fit in page option
    {
        if(boardBoundingBox.GetWidth() && boardBoundingBox.GetHeight())
        {
            int margin = Millimeter2iu( 10.0 ); // add a margin around the drawings
            double scaleX = (double)(pageSizeIU.x - (2 * margin)) /
                            boardBoundingBox.GetWidth();
            double scaleY = (double)(pageSizeIU.y - (2 * margin)) /
                            boardBoundingBox.GetHeight();
            userscale = (scaleX < scaleY) ? scaleX : scaleY;
        }
        else
            userscale = 1.0;
    }

    wxSize scaledPageSize = pageSizeIU;
    drawRect.SetSize( scaledPageSize );
    scaledPageSize.x = wxRound( scaledPageSize.x / userscale );
    scaledPageSize.y = wxRound( scaledPageSize.y / userscale );


    if( m_PrintParams.m_PageSetupData )
    {
        // Always scale to the size of the paper.
        FitThisSizeToPageMargins( scaledPageSize, *m_PrintParams.m_PageSetupData );
    }

    // Compute Accurate scale 1
    if( m_PrintParams.m_PrintScale == 1.0 )
    {
        // We want a 1:1 scale, regardless the page setup
        // like page size, margin ...
        MapScreenSizeToPaper(); // set best scale and offset (scale is not used)
        int w, h;
        GetPPIPrinter( &w, &h );
        double accurate_Xscale = (double) w / (IU_PER_MILS*1000);
        double accurate_Yscale = (double) h / (IU_PER_MILS*1000);

        if( IsPreview() )  // Scale must take in account the DC size in Preview
        {
            // Get the size of the DC in pixels
            wxSize       PlotAreaSize;
            dc->GetSize( &PlotAreaSize.x, &PlotAreaSize.y );
            GetPageSizePixels( &w, &h );
            accurate_Xscale *= (double)PlotAreaSize.x / w;
            accurate_Yscale *= (double)PlotAreaSize.y / h;
        }
        // Fine scale adjust
        accurate_Xscale *= m_PrintParams.m_XScaleAdjust;
        accurate_Yscale *= m_PrintParams.m_YScaleAdjust;

        // Set print scale for 1:1 exact scale
        dc->SetUserScale( accurate_Xscale, accurate_Yscale );
    }

    // Get the final size of the DC in pixels
    wxSize       PlotAreaSizeInPixels;
    dc->GetSize( &PlotAreaSizeInPixels.x, &PlotAreaSizeInPixels.y );

    double scalex, scaley;
    dc->GetUserScale( &scalex, &scaley );

    // In some cases the plot origin is the centre of the board outline rather than the center
    // of the selected paper size.
    if( m_PrintParams.CenterOnBoardOutline() )
    {
        // Here we are only drawing the board and it's contents.
        drawRect = boardBoundingBox;
        offset.x += wxRound( (double) -scaledPageSize.x / 2.0 );
        offset.y += wxRound( (double) -scaledPageSize.y / 2.0 );

        wxPoint center = boardBoundingBox.Centre();

        if( printMirror )
        {
            // Calculate the mirrored center of the board.
//.........这里部分代码省略.........