kicad/common/dcsvg.cpp

/////////////////////////////////////////////////////////////////////////////

// Name:        svg.cpp
// Purpose:     SVG plot
// Author:      Chris Elliott
// Modified by: JP Charras (dec 2006)
// Licence:     wxWindows license
/////////////////////////////////////////////////////////////////////////////



// For compilers that support precompilation, includes "wx/wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#ifndef WX_PRECOMP
#include "wx/wx.h"
#endif

#if wxCHECK_VERSION( 2, 9, 0 )
// Do nothing, because wxWidgets 3 supports the SVG format
// previously, was a contribution library, not included in wxWidgets base

#else

#include "dcsvg.h"

#include "wx/image.h"
#include "macros.h"

#define wxSVG_DEBUG FALSE

// or TRUE to see the calls being executed
#define newline    wxString( wxT( "\n" ) )
#define space      wxString( wxT( " " ) )
#define semicolon  wxString( wxT( ";" ) )

#ifdef __BORLANDC__
#pragma warn -rch
#pragma warn -ccc
#endif


/* some define not included in early wxWidget versions: */
#ifndef twips2mm
#define twips2mm         0.0176388888889
#endif
#ifndef pt2mm
#define pt2mm            0.352777777778
#endif

static inline double DegToRad( double deg )
{
    return (deg * M_PI) / 180.0;
};

wxString wxColStr( wxColour c )
{
    unsigned char r, g, b;

    r = c.Red();
    g = c.Green();
    b = c.Blue();

    // possible Unicode bug here
    wxString s = wxDecToHex( r ) + wxDecToHex( g ) + wxDecToHex( b );
    return s;
}


wxString wxBrushString( wxColour c, int style )
{
    wxString s = wxT( "fill:#" ) + wxColStr( c ) + semicolon + space;

    switch( style )
    {
    case wxSOLID:
        s = s + wxT( "fill-opacity:1.0; " );
        break;

    case wxTRANSPARENT:
        s = s + wxT( "fill-opacity:0.0; " );
        break;

    default:
        wxASSERT_MSG( FALSE, wxT( "wxSVGFileDC::Requested Brush Style not available" ) );
    }

    s = s + newline;
    return s;
}


/***********************************************************************/
void wxSVGFileDC::Init( wxString f, int Width, int Height, float dpi )
/***********************************************************************/

/* set up things first  wxDCBase does all this?
 */
{
    m_width  = Width;
    m_height = Height;

    m_clipping = FALSE;
    m_OK = TRUE;

    m_mm_to_pix_x = dpi / 25.4;
    m_mm_to_pix_y = dpi / 25.4;

    m_signX = m_signY = 1;

    m_userScaleX = m_userScaleY =
                       m_deviceOriginX = m_deviceOriginY = 0;

    m_OriginX = m_OriginY = 0;
    m_logicalOriginX = m_logicalOriginY = 0;
    m_logicalScaleX  = m_logicalScaleY = 0;
    m_scaleX = m_scaleY = 1.0;

    m_logicalFunction = wxCOPY;
    m_backgroundMode  = wxTRANSPARENT;
    m_mappingMode = wxMM_TEXT;

    m_backgroundBrush      = *wxTRANSPARENT_BRUSH;
    m_textForegroundColour = *wxBLACK;
    m_textBackgroundColour = *wxWHITE;
    m_colour = wxColourDisplay();

    m_pen   = *wxBLACK_PEN;
    m_font  = *wxNORMAL_FONT;
    m_brush = *wxWHITE_BRUSH;

    m_graphics_changed = TRUE;

    ////////////////////code here

    m_outfile = new wxFileOutputStream( f );
    m_OK = m_outfile->Ok();
    if( m_OK )
    {
        m_filename   = f;
        m_sub_images = 0;
        wxString s;
        s = wxT( "<?xml version=\"1.0\" standalone=\"no\"?>" ); s = s + newline;
        write( s );
        s = wxT( "<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\" " ) + newline;
        write( s );
        s = wxT( "\"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\"> " ) + newline;
        write( s );

        s.Printf( wxT( "<svg\n" ) );
        write( s );
        s.Printf( wxT( "  xmlns=\"http://www.w3.org/2000/svg\"\n" ) );
        write( s );
        s.Printf( wxT( "  version=\"1.1\"\n" ) );
        write( s );
        s.Printf( wxT( "  width=\"%.2gcm\" height=\"%.2gcm\" viewBox=\"0 0 %d %d \"\n" ),
                  float (Width) / dpi * 2.54, float (Height) / dpi * 2.54, Width, Height );
        write( s );
        s.Printf( wxT( ">\n" ) );
        write( s );

        s = wxT( "  <title>SVG Picture created as " ) + wxFileNameFromPath( f ) +
            wxT( " </title>" ) + newline;
        write( s );
        s = wxString( wxT( "  <desc>Picture generated by wxSVG " ) ) + wxSVGVersion + wxT(
            " </desc>" ) + newline;
        write( s );
        s = wxT( "  <g style=\"fill:black; stroke:black; stroke-width:1\">" ) + newline;
        write( s );
    }
}


// constructors
wxSVGFileDC::wxSVGFileDC( wxString f )
{
    // quarter 640x480 screen display at 72 dpi
    Init( f, 320, 240, 72.0 );
};

wxSVGFileDC::wxSVGFileDC( wxString f, int Width, int Height )
{
    Init( f, Width, Height, 72.0 );
};

wxSVGFileDC::wxSVGFileDC( wxString f, int Width, int Height, float dpi )
{
    Init( f, Width, Height, dpi );
};

wxSVGFileDC::~wxSVGFileDC()
{
    wxString s = wxT( "</g> \n</svg> \n" );

    write( s );
    delete m_outfile;
}


//////////////////////////////////////////////////////////////////////////////////////////

void wxSVGFileDC::DoDrawLine( wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2 )
{
    if( m_graphics_changed )
        NewGraphics();
    wxString s;
    s.Printf( wxT( "<path d=\"M%d %d L%d %d\" /> \n" ), x1, y1, x2, y2 );
    if( m_OK )
    {
        write( s );
    }
    wxASSERT_MSG( !wxSVG_DEBUG, wxT( "wxSVGFileDC::DrawLine Call executed" ) );
    CalcBoundingBox( x1, y1 );
    CalcBoundingBox( x2, y2 );
    return;
};

void wxSVGFileDC::DoDrawLines( int n, wxPoint points[], wxCoord xoffset, wxCoord yoffset )
{
    for( int i = 1; i < n; i++ )
    {
        DoDrawLine( points[i - 1].x + xoffset, points[i - 1].y + yoffset,
                    points[ i ].x + xoffset, points[ i ].y + yoffset );
    }
}


void wxSVGFileDC::DoDrawPoint( wxCoord x1, wxCoord y1 )
{
    wxString s;

    if( m_graphics_changed )
        NewGraphics();
    s = wxT( "<g style = \"stroke-linecap:round;\" > " ) + newline;
    write( s );
    DrawLine( x1, y1, x1, y1 );
    s = wxT( "</g>" );
    write( s );
}


void wxSVGFileDC::DoDrawCheckMark( wxCoord x1, wxCoord y1, wxCoord width, wxCoord height )
{
    wxDCBase::DoDrawCheckMark( x1, y1, width, height );
}


void wxSVGFileDC::DoDrawText( const wxString& text, wxCoord x1, wxCoord y1 )
{
    DoDrawRotatedText( text, x1, y1, 0.0 );
    wxASSERT_MSG( !wxSVG_DEBUG, wxT( "wxSVGFileDC::DrawText Call executed" ) );
}


void wxSVGFileDC::DoDrawRotatedText( const wxString& sText, wxCoord x, wxCoord y, double angle )
{
    //known bug; if the font is drawn in a scaled DC, it will not behave exactly as wxMSW
    if( m_graphics_changed )
        NewGraphics();
    wxString s, sTmp;

    // calculate bounding box
    wxCoord  w, h, desc;
    DoGetTextExtent( sText, &w, &h, &desc );

    double   rad = DegToRad( angle );

    // wxT("upper left") and wxT("upper right")
    CalcBoundingBox( x, y );
    CalcBoundingBox( (wxCoord) ( x + w * cos( rad ) ), (wxCoord) ( y - h * sin( rad ) ) );

    // wxT("bottom left") and wxT("bottom right")
    x += (wxCoord) ( h * sin( rad ) );
    y += (wxCoord) ( h * cos( rad ) );
    CalcBoundingBox( x, y );
    CalcBoundingBox( (wxCoord) ( x + h * sin( rad ) ), (wxCoord) ( y + h * cos( rad ) ) );

    if( m_backgroundMode == wxSOLID )
    {
        // draw background first
        // just like DoDrawRectangle except we pass the text color to it and set the border to a 1 pixel wide text background

        wxASSERT_MSG( !wxSVG_DEBUG,
                     wxT( "wxSVGFileDC::Draw Rotated Text Call plotting text background" ) );
        sTmp.Printf( wxT(
                         " <rect x=\"%d\" y=\"%d\" width=\"%d\" height=\"%d\"  " ), x, y + desc -
                     h, w, h );
        s = sTmp + wxT( "style=\"fill:#" ) + wxColStr( m_textBackgroundColour ) + wxT( "; " );
        s = s + wxT( "stroke-width:1; stroke:#" ) + wxColStr( m_textBackgroundColour ) + wxT( "; " );
        sTmp.Printf( wxT( "\" transform=\"rotate( %.2g %d %d )  \">" ), -angle, x, y );
        s = s + sTmp + newline;
        write( s );
    }

    //now do the text itself
    s.Printf( wxT( " <text x=\"%d\" y=\"%d\" " ), x, y );

    sTmp = m_font.GetFaceName();
    if( sTmp.Len() > 0 )
        s = s + wxT( "style=\"font-family:" ) + sTmp + wxT( "; " );
    else
        s = s + wxT( "style=\" " );

    wxString fontweights[3] = { wxT( "normal" ), wxT( "lighter" ), wxT( "bold" ) };
    s = s + wxT( "font-weight:" ) + fontweights[m_font.GetWeight() - wxNORMAL] + semicolon + space;

    wxString fontstyles[5] = {
        wxT( "normal" ), wxT( "style error" ), wxT( "style error" ), wxT(
            "italic" ),  wxT( "oblique" )
    };
    s = s + wxT( "font-style:" ) + fontstyles[m_font.GetStyle() - wxNORMAL] + semicolon + space;

    sTmp.Printf( wxT( "font-size:%dpt; fill:#" ), m_font.GetPointSize() );
    s = s + sTmp;
    s = s + wxColStr( m_textForegroundColour ) + wxT( "; stroke:#" ) + wxColStr(
        m_textForegroundColour ) + wxT( "; " );
    sTmp.Printf( wxT( "stroke-width:0;\"  transform=\"rotate( %.2g %d %d )  \" >" ), -angle, x, y );
    s = s + sTmp + sText + wxT( "</text> " ) + newline;
    if( m_OK )
    {
        write( s );
    }
    wxASSERT_MSG( !wxSVG_DEBUG, wxT( "wxSVGFileDC::DrawRotatedText Call executed" ) );
}


void wxSVGFileDC::DoDrawRectangle( wxCoord x, wxCoord y, wxCoord width, wxCoord height )
{
    DoDrawRoundedRectangle( x, y, width, height, 0 );
}


void wxSVGFileDC::DoDrawRoundedRectangle( wxCoord x,
                                          wxCoord y,
                                          wxCoord width,
                                          wxCoord height,
                                          double  radius )

{
    if( m_graphics_changed )
        NewGraphics();
    wxString s;

    s.Printf( wxT( " <rect x=\"%d\" y=\"%d\" width=\"%d\" height=\"%d\" rx=\"%.2g\" " ),
              x, y, width, height, radius );

    s = s + wxT( " /> " ) + newline;
    write( s );

    wxASSERT_MSG( !wxSVG_DEBUG, wxT( "wxSVGFileDC::DoDrawRoundedRectangle Call executed" ) );
    CalcBoundingBox( x, y );
    CalcBoundingBox( x + width, y + height );
}


void wxSVGFileDC::DoDrawPolygon( int     n,
                                 wxPoint points[],
                                 wxCoord xoffset,
                                 wxCoord yoffset,
                                 int     fillStyle )
{
    if( m_graphics_changed )
        NewGraphics();
    wxString s, sTmp;
    s = wxT( "<polygon style=\"" );
    if( fillStyle == wxODDEVEN_RULE )
        s = s + wxT( "fill-rule:evenodd; " );
    else
        s = s + wxT( "fill-rule:nonzero; " );

    s = s + wxT( "\" \npoints=\"" );

    for( int i = 0; i < n;  i++ )
    {
        sTmp.Printf( wxT( "%d,%d" ), points[i].x + xoffset, points[i].y + yoffset );
        s = s + sTmp + newline;
        CalcBoundingBox( points[i].x + xoffset, points[i].y + yoffset );
    }

    s = s + wxT( "\" /> " );
    s = s + newline;
    write( s );

    wxASSERT_MSG( !wxSVG_DEBUG, wxT( "wxSVGFileDC::DoDrawPolygon Call executed" ) );
}


void wxSVGFileDC::DoDrawEllipse( wxCoord x, wxCoord y, wxCoord width, wxCoord height )

{
    if( m_graphics_changed )
        NewGraphics();

    int      rh = height / 2;
    int      rw = width / 2;

    wxString s;
    s.Printf( wxT( "<ellipse cx=\"%d\" cy=\"%d\" rx=\"%d\" ry=\"%d\" " ), x + rw, y + rh, rw, rh );
    s = s + wxT( " /> " ) + newline;

    write( s );

    wxASSERT_MSG( !wxSVG_DEBUG, wxT( "wxSVGFileDC::DoDrawEllipse Call executed" ) );
    CalcBoundingBox( x, y );
    CalcBoundingBox( x + width, y + height );
}


void wxSVGFileDC::DoDrawArc( wxCoord x1,
                             wxCoord y1,
                             wxCoord x2,
                             wxCoord y2,
                             wxCoord xc,
                             wxCoord yc )
{
    /* Draws an arc of a circle, centred on (xc, yc), with starting point
     *  (x1, y1) and ending at (x2, y2). The current pen is used for the outline
     *  and the current brush for filling the shape.
     *
     *  The arc is drawn in an anticlockwise direction from the start point to
     *  the end point. */

    if( m_graphics_changed )
        NewGraphics();
    wxString s;

    // we need the radius of the circle which has two estimates
    double   r1 = sqrt( double ( (x1 - xc) * (x1 - xc) ) + double ( (y1 - yc) * (y1 - yc) ) );
    double   r2 = sqrt( double ( (x2 - xc) * (x2 - xc) ) + double ( (y2 - yc) * (y2 - yc) ) );

    wxASSERT_MSG( (fabs( r2 - r1 ) <= 3),
                 wxT( "wxSVGFileDC::DoDrawArc Error in getting radii of circle" ) );
    if( fabs( r2 - r1 ) > 3 )    //pixels
    {
        s = wxT( "<!--- wxSVGFileDC::DoDrawArc Error in getting radii of circle --> \n" );
        write( s );
    }

    double theta1 = atan2( (double) (yc - y1), (double) (x1 - xc) );
    if( theta1 < 0 )
        theta1 = theta1 + M_PI * 2;
    double theta2 = atan2( (double) (yc - y2), (double) (x2 - xc) );
    if( theta2 < 0 )
        theta2 = theta2 + M_PI * 2;
    if( theta2 < theta1 )
        theta2 = theta2 + M_PI * 2;

    int fArc;                  // flag for large or small arc 0 means less than 180 degrees
    if( fabs( theta2 - theta1 ) > M_PI )
        fArc = 1;else
        fArc = 0;

    int fSweep;
    if( (theta2 - theta1) > 0 )
        fSweep = 0;else
        fSweep = 1;
    float Axis_rotation = 0.0;

// Draw arc as pie:
//	s.Printf ( wxT("<path d=\"M%d %d A%.2g %.2g 0.0 %d %d %d %d L%d %d z "),
//	the z means close the path and fill (usefull to draw a pie)
//      x1, y1, r1, r2, fArc, fSweep, x2, y2, xc ,yc );

    // Draw a single arc:
    s.Printf( wxT( "<path d=\"M%d %d A%.2g %.2g %g %d %d %d %d" ),
              x1, y1, r1, r2,
              Axis_rotation,
              fArc, fSweep, x2, y2 );

    s = s + wxT( " \" /> " ) + newline;


    if( m_OK )
    {
        write( s );
    }

    wxASSERT_MSG( !wxSVG_DEBUG, wxT( "wxSVGFileDC::DoDrawArc Call executed" ) );
}


void wxSVGFileDC::DoDrawEllipticArc( wxCoord x,
                                     wxCoord y,
                                     wxCoord w,
                                     wxCoord h,
                                     double  sa,
                                     double  ea )
{
    /*
     *  Draws an arc of an ellipse. The current pen is used for drawing the arc
     *  and the current brush is used for drawing the pie. This function is
     *  currently only available for X window and PostScript device contexts.
     *
     *  x and y specify the x and y coordinates of the upper-left corner of the
     *  rectangle that contains the ellipse.
     *
     *  width and height specify the width and height of the rectangle that
     *  contains the ellipse.
     *
     *  start and end specify the start and end of the arc relative to the
     *  three-o'clock position from the center of the rectangle. Angles are
     *  specified in degrees (360 is a complete circle). Positive values mean
     *  counter-clockwise motion. If start is equal to end, a complete ellipse
     *  will be drawn. */

    //known bug: SVG draws with the current pen along the radii, but this does not happen in wxMSW

    if( m_graphics_changed )
        NewGraphics();

    wxString s;

    //radius
    double   rx = w / 2;
    double   ry = h / 2;

    // center
    double   xc = x + rx;
    double   yc = y + ry;

    double   xs, ys, xe, ye;
    xs = xc + rx*   cos( DegToRad (sa) );

    xe = xc + rx*   cos( DegToRad (ea) );

    ys = yc - ry*   sin( DegToRad (sa) );

    ye = yc - ry*   sin( DegToRad (ea) );

    ///now same as circle arc...

    double theta1 = atan2( ys - yc, xs - xc );
    double theta2 = atan2( ye - yc, xe - xc );

    int    fArc;    // flag for large or small arc 0 means less than 180 degrees
    if( fabs( theta2 - theta1 ) > M_PI )
        fArc = 1;else
        fArc = 0;

    int fSweep;
    if( (theta2 - theta1) > 0 )
        fSweep = 0;else
        fSweep = 1;
    float Axis_rotation = 0.0;

    // Draw a single arc:
    s.Printf( wxT( "<path d=\"M%d,%d A%d,%d %g %d %d %d,%d" ),
             int (xs), int (ys),
             int (rx), int (ry),
             Axis_rotation,
             fArc, fSweep, int (xe), int (ye) );


    s = s + wxT( " \" /> " ) + newline;

    if( m_OK )
    {
        write( s );
    }

    wxASSERT_MSG( !wxSVG_DEBUG, wxT( "wxSVGFileDC::DoDrawEllipticArc Call executed" ) );
}


void wxSVGFileDC::DoGetTextExtent( const wxString& string,
                                   wxCoord*        w,
                                   wxCoord*        h,
                                   wxCoord*        descent,
                                   wxCoord*        externalLeading,
                                   wxFont*         font ) const

{
    wxScreenDC sDC;

    sDC.SetFont( m_font );
    if( font != NULL )
        sDC.SetFont( *font );
    sDC.GetTextExtent( string, w, h, descent, externalLeading );
    wxASSERT_MSG( !wxSVG_DEBUG, wxT( "wxSVGFileDC::GetTextExtent Call executed" ) );
}


wxCoord wxSVGFileDC::GetCharHeight() const

{
    wxScreenDC sDC;

    sDC.SetFont( m_font );

    wxASSERT_MSG( !wxSVG_DEBUG, wxT( "wxSVGFileDC::GetCharHeight Call executing" ) );
    return sDC.GetCharHeight();
}


wxCoord wxSVGFileDC::GetCharWidth() const
{
    wxScreenDC sDC;

    sDC.SetFont( m_font );

    wxASSERT_MSG( !wxSVG_DEBUG, wxT( "wxSVGFileDC::GetCharWidth Call executing" ) );
    return sDC.GetCharWidth();
}


/// Set Functions /////////////////////////////////////////////////////////////////
void wxSVGFileDC::SetBackground( const wxBrush& brush )
{
    m_backgroundBrush = brush;
    return;
}


void wxSVGFileDC::SetBackgroundMode( int mode )
{
    m_backgroundMode = mode;
    return;
}


void wxSVGFileDC::SetBrush( const wxBrush& brush )

{
    m_brush = brush;

    m_graphics_changed = TRUE;
    wxASSERT_MSG( !wxSVG_DEBUG, wxT( "wxSVGFileDC::SetBrush Call executed" ) );
}


void wxSVGFileDC::SetPen( const wxPen& pen )
{
    // width, color, ends, joins : currently implemented
    // dashes, stipple :  not implemented
    m_pen = pen;

    m_graphics_changed = TRUE;
    wxASSERT_MSG( !wxSVG_DEBUG, wxT( "wxSVGFileDC::SetPen Call executed" ) );
}


void wxSVGFileDC::NewGraphics()
{
    int      w = m_pen.GetWidth();
    wxColour c = m_pen.GetColour();

    wxString s, sBrush, sPenCap, sPenJoin, sPenStyle, sLast, sWarn;

    sBrush = wxT( "</g>\n<g style=\"" ) + wxBrushString( m_brush.GetColour(), m_brush.GetStyle() )
             + wxT( "  stroke:#" ) + wxColStr( c ) + wxT( "; " );

    switch( m_pen.GetCap() )
    {
    case  wxCAP_PROJECTING:
        sPenCap = wxT( "stroke-linecap:square; " );
        break;

    case  wxCAP_BUTT:
        sPenCap = wxT( "stroke-linecap:butt; " );
        break;

    case    wxCAP_ROUND:
    default:
        sPenCap = wxT( "stroke-linecap:round; " );
    }

    ;

    switch( m_pen.GetJoin() )
    {
    case  wxJOIN_BEVEL:
        sPenJoin = wxT( "stroke-linejoin:bevel; " );
        break;

    case  wxJOIN_MITER:
        sPenJoin = wxT( "stroke-linejoin:miter; " );
        break;

    case    wxJOIN_ROUND:
    default:
        sPenJoin = wxT( "stroke-linejoin:round; " );
    }

    ;

    switch( m_pen.GetStyle() )
    {
    case  wxSOLID:
        sPenStyle = wxT( "stroke-opacity:1.0; stroke-opacity:1.0; " );
        break;

    case  wxTRANSPARENT:
        sPenStyle = wxT( "stroke-opacity:0.0; stroke-opacity:0.0; " );
        break;

    default:
        wxASSERT_MSG( FALSE,
                      wxT( "wxSVGFileDC::SetPen Call called to set a Style which is not available" )
                      );
        sWarn = sWarn + wxT(
            "<!--- wxSVGFileDC::SetPen Call called to set a Style which is not available --> \n" );
    }

    sLast.Printf(   wxT(
                        "stroke-width:%d\" \n   transform=\"translate(%.2g %.2g) scale(%.2g %.2g)\">" ),
                    w, m_OriginX, m_OriginY, m_scaleX, m_scaleY  );

    s = sBrush + sPenCap + sPenJoin + sPenStyle + sLast + newline + sWarn;
    write( s );
    m_graphics_changed = FALSE;
    wxASSERT_MSG( !wxSVG_DEBUG, wxT( "wxSVGFileDC::NewGraphics Call executed" ) );
}


void wxSVGFileDC::SetFont( const wxFont& font )

{
    m_font = font;

    wxASSERT_MSG( !wxSVG_DEBUG, wxT( "wxSVGFileDC::SetFont Call executed" ) );
}


void wxSVGFileDC::ComputeScaleAndOrigin()
{
    m_scaleX  = m_logicalScaleX * m_userScaleX;
    m_scaleY  = m_logicalScaleY * m_userScaleY;
    m_OriginX = m_logicalOriginX * m_logicalScaleX + m_deviceOriginX;
    m_OriginY = m_logicalOriginY * m_logicalScaleY + m_deviceOriginY;
    m_graphics_changed = TRUE;
}


int wxSVGFileDC::GetMapMode()
{
    return m_mappingMode;
}


void wxSVGFileDC::SetMapMode( int mode )
{
    switch( mode )
    {
    case wxMM_TWIPS:
        SetLogicalScale( twips2mm * m_mm_to_pix_x, twips2mm * m_mm_to_pix_y );
        break;

    case wxMM_POINTS:
        SetLogicalScale( pt2mm * m_mm_to_pix_x, pt2mm * m_mm_to_pix_y );
        break;

    case wxMM_METRIC:
        SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
        break;

    case wxMM_LOMETRIC:
        SetLogicalScale( m_mm_to_pix_x / 10.0, m_mm_to_pix_y / 10.0 );
        break;

    default:
    case wxMM_TEXT:
        SetLogicalScale( 1.0, 1.0 );
        break;
    }

    m_mappingMode = mode;

    /*  we don't do this mega optimisation
     *  if (mode != wxMM_TEXT)
     *  {
     *      m_needComputeScaleX = TRUE;
     *      m_needComputeScaleY = TRUE;
     *  }
     */
}


void wxSVGFileDC::GetUserScale( double* x, double* y ) const
{
    *x = m_userScaleX;
    *y = m_userScaleY;
}


void wxSVGFileDC::SetUserScale( double x, double y )
{
    // allow negative ? -> no
    m_userScaleX = x;
    m_userScaleY = y;
    ComputeScaleAndOrigin();
}


void wxSVGFileDC::SetLogicalScale( double x, double y )
{
    // allow negative ?
    m_logicalScaleX = x;
    m_logicalScaleY = y;
    ComputeScaleAndOrigin();
}


void wxSVGFileDC::SetLogicalOrigin( wxCoord x, wxCoord y )
{
    // is this still correct ?
    m_logicalOriginX = x * m_signX;
    m_logicalOriginY = y * m_signY;
    ComputeScaleAndOrigin();
}


void wxSVGFileDC::SetDeviceOrigin( wxCoord x, wxCoord y )
{
    // only wxPostScripDC has m_signX = -1,
    m_deviceOriginX = x;
    m_deviceOriginY = y;
    ComputeScaleAndOrigin();
}


void wxSVGFileDC::SetAxisOrientation( bool xLeftRight, bool yBottomUp )
{
    // only wxPostScripDC has m_signX = -1,
    m_signX = (xLeftRight ?  1 : -1);
    m_signY = (yBottomUp  ? -1 :  1);
    ComputeScaleAndOrigin();
}


// export a bitmap as a raster image in png
bool wxSVGFileDC::DoBlit( wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
                          wxDC* source, wxCoord xsrc, wxCoord ysrc,
                          int logicalFunc /*= wxCOPY*/, bool useMask /*= FALSE*/,
                          wxCoord /*xsrcMask = -1*/, wxCoord /*ysrcMask = -1*/ )
{
    if( logicalFunc != wxCOPY )
    {
        wxASSERT_MSG( FALSE,
                      wxT( "wxSVGFileDC::DoBlit Call requested nonCopy mode; this is not possible" )
                      );
        return FALSE;
    }
    if( useMask != FALSE )
    {
        wxASSERT_MSG( FALSE,
                      wxT( "wxSVGFileDC::DoBlit Call requested False mask ; this is not possible" )
                      );
        return FALSE;
    }
    wxBitmap   myBitmap( width, height );
    wxMemoryDC memDC;
    memDC.SelectObject( myBitmap );
    memDC.Blit( 0, 0, width, height, source, xsrc, ysrc );
    memDC.SelectObject( wxNullBitmap );
    DoDrawBitmap( myBitmap, xdest, ydest );
    wxASSERT_MSG( !wxSVG_DEBUG, wxT( "wxSVGFileDC::DoBlit Call executed" ) );
    return FALSE;
}


void wxSVGFileDC::DoDrawIcon( const class wxIcon& myIcon, wxCoord x, wxCoord y )
{
    wxBitmap   myBitmap( myIcon.GetWidth(), myIcon.GetHeight() );
    wxMemoryDC memDC;

    memDC.SelectObject( myBitmap );
    memDC.DrawIcon( myIcon, 0, 0 );
    memDC.SelectObject( wxNullBitmap );
    DoDrawBitmap( myBitmap, x, y );
    wxASSERT_MSG( !wxSVG_DEBUG, wxT( "wxSVGFileDC::DoDrawIcon Call executed" ) );
    return;
}


void wxSVGFileDC::DoDrawBitmap( const class wxBitmap& bmp,
                                wxCoord               x,
                                wxCoord               y,
                                bool WXUNUSED (       bTransparent) /*=0*/ )
{
    if( m_graphics_changed )
        NewGraphics();

    wxString sTmp, s, sPNG;
    wxImage::AddHandler( new wxPNGHandler );

// create suitable file name
    sTmp.Printf( wxT( "_image%d.png" ), m_sub_images );
    sPNG = m_filename.BeforeLast( wxT( '.' ) ) + sTmp;
    while( wxFile::Exists( sPNG ) )
    {
        m_sub_images++;
        sTmp.Printf( wxT( "_image%d.png" ), m_sub_images );
        sPNG = m_filename.BeforeLast( wxT( '.' ) ) + sTmp;
    }

//create copy of bitmap (wxGTK doesn't like saving a constant bitmap)
    wxBitmap myBitmap = bmp;

//save it
    bool     bPNG_OK = myBitmap.SaveFile( sPNG, wxBITMAP_TYPE_PNG );

// refrence the bitmap from the SVG doc
    int      w = myBitmap.GetWidth();
    int      h = myBitmap.GetHeight();
    sTmp.Printf( wxT( " <image x=\"%d\" y=\"%d\" width=\"%dpx\" height=\"%dpx\" " ), x, y, w, h );
    s = s + sTmp;
    sTmp.Printf( wxT( " xlink:href=\"%s\"> \n" ), GetChars( sPNG ) );
    s = s + sTmp + wxT( "<title>Image from wxSVG</title>  </image>" ) + newline;

    if( m_OK && bPNG_OK )
    {
        write( s );
    }
    m_OK = m_outfile->Ok() && bPNG_OK;
    wxASSERT_MSG( !wxSVG_DEBUG, wxT( "wxSVGFileDC::DoDrawBitmap Call executed" ) );

    return;
}


// ---------------------------------------------------------------------------
// coordinates transformations
// ---------------------------------------------------------------------------

wxCoord wxSVGFileDC::DeviceToLogicalX( wxCoord x ) const
{
    return XDEV2LOG( x );
}


wxCoord wxSVGFileDC::DeviceToLogicalY( wxCoord y ) const
{
    return YDEV2LOG( y );
}


wxCoord wxSVGFileDC::DeviceToLogicalXRel( wxCoord x ) const
{
    return XDEV2LOGREL( x );
}


wxCoord wxSVGFileDC::DeviceToLogicalYRel( wxCoord y ) const
{
    return YDEV2LOGREL( y );
}


wxCoord wxSVGFileDC::LogicalToDeviceX( wxCoord x ) const
{
    return XLOG2DEV( x );
}


wxCoord wxSVGFileDC::LogicalToDeviceY( wxCoord y ) const
{
    return YLOG2DEV( y );
}


wxCoord wxSVGFileDC::LogicalToDeviceXRel( wxCoord x ) const
{
    return XLOG2DEVREL( x );
}


wxCoord wxSVGFileDC::LogicalToDeviceYRel( wxCoord y ) const
{
    return YLOG2DEVREL( y );
}


void wxSVGFileDC::write( const wxString& s )
{
    const wxWX2MBbuf buf = s.mb_str( wxConvUTF8 );

    m_outfile->Write( buf, strlen( (const char*) buf ) );
    m_OK = m_outfile->Ok();
}


#ifdef __BORLANDC__
#pragma warn .rch
#pragma warn .ccc
#endif

#endif // wxCHECK_VERSION