dccg.cpp

很牛的GUI源码wxWidgets-2.8.0.zip 可在多种平台下运行.

    CGContextRestoreGState( cgContext );
    CGContextSaveGState( cgContext );

    m_graphicContext->SetPen( m_pen ) ;
    m_graphicContext->SetBrush( m_brush ) ;

    m_clipping = false;
}

void wxDC::DoGetSizeMM( int* width, int* height ) const
{
    int w = 0, h = 0;

    GetSize( &w, &h );
    if (width)
        *width = long( double(w) / (m_scaleX * m_mm_to_pix_x) );
    if (height)
        *height = long( double(h) / (m_scaleY * m_mm_to_pix_y) );
}

void wxDC::SetTextForeground( const wxColour &col )
{
    wxCHECK_RET( Ok(), wxT("wxDC(cg)::SetTextForeground - invalid DC") );

    if ( col != m_textForegroundColour )
    {
        m_textForegroundColour = col;
        m_graphicContext->SetTextColor( col );
        // in the current implementation the font contains the text color
        m_graphicContext->SetFont(m_font);
    }
}

void wxDC::SetTextBackground( const wxColour &col )
{
    wxCHECK_RET( Ok(), wxT("wxDC(cg)::SetTextBackground - invalid DC") );

    m_textBackgroundColour = col;
}

void wxDC::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;

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

    if (mode != wxMM_TEXT)
    {
        m_needComputeScaleX =
        m_needComputeScaleY = true;
    }
}

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

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

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

void wxDC::SetDeviceOrigin( wxCoord x, wxCoord y )
{
    m_externalDeviceOriginX = x;
    m_externalDeviceOriginY = y;
    ComputeScaleAndOrigin();
}

void wxDC::SetAxisOrientation( bool xLeftRight, bool yBottomUp )
{
    m_signX = (xLeftRight ?  1 : -1);
    m_signY = (yBottomUp ? -1 :  1);
    ComputeScaleAndOrigin();
}

wxSize wxDC::GetPPI() const
{
    return wxSize(72, 72);
}

int wxDC::GetDepth() const
{
    return 32;
}

void wxDC::ComputeScaleAndOrigin()
{
    // CMB: copy scale to see if it changes
    double origScaleX = m_scaleX;
    double origScaleY = m_scaleY;
    m_scaleX = m_logicalScaleX * m_userScaleX;
    m_scaleY = m_logicalScaleY * m_userScaleY;
    m_deviceOriginX = m_externalDeviceOriginX;
    m_deviceOriginY = m_externalDeviceOriginY;

    // CMB: if scale has changed call SetPen to recalulate the line width
    if (m_scaleX != origScaleX || m_scaleY != origScaleY)
    {
        // this is a bit artificial, but we need to force wxDC to think
        // the pen has changed
        wxPen pen( GetPen() );

        m_pen = wxNullPen;
        SetPen( pen );
    }
}

void wxDC::SetPalette( const wxPalette& palette )
{
}

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

void wxDC::SetFont( const wxFont &font )
{
    m_font = font;
    if ( m_graphicContext )
        m_graphicContext->SetFont( font ) ;
}

void wxDC::SetPen( const wxPen &pen )
{
    if ( m_pen == pen )
        return ;

    m_pen = pen;
    if ( m_graphicContext )
    {
        if ( m_pen.GetStyle() == wxSOLID || m_pen.GetStyle() == wxTRANSPARENT )
        {
            m_graphicContext->SetPen( m_pen ) ;
        }
        else
        {
            // we have to compensate for moved device origins etc. otherwise patterned pens are standing still
            // eg when using a wxScrollWindow and scrolling around
            int origX = XLOG2DEVMAC( 0 ) ;
            int origY = YLOG2DEVMAC( 0 ) ;
            m_graphicContext->Translate( origX , origY ) ;
            m_graphicContext->SetPen( m_pen ) ;
            m_graphicContext->Translate( -origX , -origY ) ;
        }
    }
}

void wxDC::SetBrush( const wxBrush &brush )
{
    if (m_brush == brush)
        return;

    m_brush = brush;
    if ( m_graphicContext )
    {
        if ( brush.GetStyle() == wxSOLID || brush.GetStyle() == wxTRANSPARENT )
        {
            m_graphicContext->SetBrush( m_brush ) ;
        }
        else
        {
            // we have to compensate for moved device origins etc. otherwise patterned brushes are standing still
            // eg when using a wxScrollWindow and scrolling around
            int origX = XLOG2DEVMAC(0) ;
            int origY = YLOG2DEVMAC(0) ;
            m_graphicContext->Translate( origX , origY ) ;
            m_graphicContext->SetBrush( m_brush ) ;
            m_graphicContext->Translate( -origX , -origY ) ;
        }
    }
}

void wxDC::SetBackground( const wxBrush &brush )
{
    if (m_backgroundBrush == brush)
        return;

    m_backgroundBrush = brush;
    if (!m_backgroundBrush.Ok())
        return;
}

void wxDC::SetLogicalFunction( int function )
{
    if (m_logicalFunction == function)
        return;

    m_logicalFunction = function ;
#if wxMAC_USE_CORE_GRAPHICS_BLEND_MODES
    CGContextRef cgContext = ((wxMacCGContext*)(m_graphicContext))->GetNativeContext() ;
    if ( m_logicalFunction == wxCOPY )
        CGContextSetBlendMode( cgContext, kCGBlendModeNormal ) ;
    else if ( m_logicalFunction == wxINVERT )
        CGContextSetBlendMode( cgContext, kCGBlendModeExclusion ) ;
    else
        CGContextSetBlendMode( cgContext, kCGBlendModeNormal ) ;
#endif
}

extern bool wxDoFloodFill(wxDC *dc, wxCoord x, wxCoord y,
                          const wxColour & col, int style);

bool wxDC::DoFloodFill(wxCoord x, wxCoord y,
                       const wxColour& col, int style)
{
    return wxDoFloodFill(this, x, y, col, style);
}

bool wxDC::DoGetPixel( wxCoord x, wxCoord y, wxColour *col ) const
{
    wxCHECK_MSG( Ok(), false, wxT("wxDC(cg)::DoGetPixel - invalid DC") );

    RGBColor colour;
#ifndef __LP64__
    wxMacPortSaver helper((CGrafPtr)m_macPort) ;
    // NB: GetCPixel is a deprecated QD call, and a slow one at that
    GetCPixel(
        XLOG2DEVMAC(x) + m_macLocalOriginInPort.x - m_macLocalOrigin.x,
        YLOG2DEVMAC(y) + m_macLocalOriginInPort.y - m_macLocalOrigin.y, &colour );
#endif
    // convert from Mac colour to wx
    col->Set( colour.red >> 8, colour.green >> 8, colour.blue >> 8 );

    return true ;
}

void wxDC::DoDrawLine( wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2 )
{
    wxCHECK_RET( Ok(), wxT("wxDC(cg)::DoDrawLine - invalid DC") );

#if !wxMAC_USE_CORE_GRAPHICS_BLEND_MODES
    if ( m_logicalFunction != wxCOPY )
        return ;
#endif

    wxCoord xx1 = XLOG2DEVMAC(x1) ;
    wxCoord yy1 = YLOG2DEVMAC(y1) ;
    wxCoord xx2 = XLOG2DEVMAC(x2) ;
    wxCoord yy2 = YLOG2DEVMAC(y2) ;

    wxGraphicPath* path = m_graphicContext->CreatePath() ;
    path->MoveToPoint( xx1, yy1 ) ;
    path->AddLineToPoint( xx2 , yy2 ) ;
    path->CloseSubpath() ;
    m_graphicContext->StrokePath( path ) ;
    delete path ;

    CalcBoundingBox(x1, y1);
    CalcBoundingBox(x2, y2);
}

void wxDC::DoCrossHair( wxCoord x, wxCoord y )
{
    wxCHECK_RET( Ok(), wxT("wxDC(cg)::DoCrossHair - invalid DC") );

    if ( m_logicalFunction != wxCOPY )
        return ;

    int w = 0, h = 0;

    GetSize( &w, &h );
    wxCoord xx = XLOG2DEVMAC(x);
    wxCoord yy = YLOG2DEVMAC(y);

    wxGraphicPath* path = m_graphicContext->CreatePath() ;
    path->MoveToPoint( XLOG2DEVMAC(0), yy ) ;
    path->AddLineToPoint( XLOG2DEVMAC(w), yy ) ;
    path->CloseSubpath() ;
    path->MoveToPoint( xx, YLOG2DEVMAC(0) ) ;
    path->AddLineToPoint( xx, YLOG2DEVMAC(h) ) ;
    path->CloseSubpath() ;
    m_graphicContext->StrokePath( path ) ;
    delete path ;

    CalcBoundingBox(x, y);
    CalcBoundingBox(x + w, y + h);
}

void wxDC::DoDrawArc( wxCoord x1, wxCoord y1,
                      wxCoord x2, wxCoord y2,
                      wxCoord xc, wxCoord yc )
{
    wxCHECK_RET( Ok(), wxT("wxDC(cg)::DoDrawArc - invalid DC") );

    if ( m_logicalFunction != wxCOPY )
        return ;

    wxCoord xx1 = XLOG2DEVMAC(x1);
    wxCoord yy1 = YLOG2DEVMAC(y1);
    wxCoord xx2 = XLOG2DEVMAC(x2);
    wxCoord yy2 = YLOG2DEVMAC(y2);
    wxCoord xxc = XLOG2DEVMAC(xc);
    wxCoord yyc = YLOG2DEVMAC(yc);

    double dx = xx1 - xxc;
    double dy = yy1 - yyc;
    double radius = sqrt((double)(dx * dx + dy * dy));
    wxCoord rad = (wxCoord)radius;
    double sa, ea;
    if (xx1 == xx2 && yy1 == yy2)
    {
        sa = 0.0;
        ea = 360.0;
    }
    else if (radius == 0.0)
    {
        sa = ea = 0.0;
    }
    else
    {
        sa = (xx1 - xxc == 0) ?
            (yy1 - yyc < 0) ? 90.0 : -90.0 :
        -atan2(double(yy1 - yyc), double(xx1 - xxc)) * RAD2DEG;
        ea = (xx2 - xxc == 0) ?
            (yy2 - yyc < 0) ? 90.0 : -90.0 :
        -atan2(double(yy2 - yyc), double(xx2 - xxc)) * RAD2DEG;
    }

    bool fill = m_brush.GetStyle() != wxTRANSPARENT ;

    wxGraphicPath* path = m_graphicContext->CreatePath() ;
    m_graphicContext->PushState() ;
    m_graphicContext->Translate( xxc, yyc ) ;
    m_graphicContext->Scale( 1, -1 ) ;
    if ( fill )
        path->MoveToPoint( 0, 0 ) ;
    path->AddArc( 0, 0, rad , DegToRad(sa) , DegToRad(ea), false ) ;
    if ( fill )
        path->AddLineToPoint( 0, 0 ) ;
    m_graphicContext->DrawPath( path ) ;
    m_graphicContext->PopState() ;
    delete path ;
}

void wxDC::DoDrawEllipticArc( wxCoord x, wxCoord y, wxCoord w, wxCoord h,
                              double sa, double ea )
{
    wxCHECK_RET( Ok(), wxT("wxDC(cg)::DoDrawEllipticArc - invalid DC") );

    if ( m_logicalFunction != wxCOPY )
        return ;

    wxCoord xx = XLOG2DEVMAC(x);
    wxCoord yy = YLOG2DEVMAC(y);
    wxCoord ww = m_signX * XLOG2DEVREL(w);
    wxCoord hh = m_signY * YLOG2DEVREL(h);

    // handle -ve width and/or height
    if (ww < 0)
    {
        ww = -ww;
        xx = xx - ww;
    }
    if (hh < 0)
    {
        hh = -hh;
        yy = yy - hh;
    }

    bool fill = m_brush.GetStyle() != wxTRANSPARENT ;

    wxGraphicPath* path = m_graphicContext->CreatePath() ;
    m_graphicContext->PushState() ;
    m_graphicContext->Translate( xx + ww / 2, yy + hh / 2 ) ;
    m_graphicContext->Scale( 1 * ww / 2 , -1 * hh / 2 ) ;
    if ( fill )
        path->MoveToPoint( 0, 0 ) ;
    path->AddArc( 0, 0, 1 , DegToRad(sa) , DegToRad(ea), false ) ;
    if ( fill )
        path->AddLineToPoint( 0, 0 ) ;
    m_graphicContext->DrawPath( path ) ;
    m_graphicContext->PopState() ;
    delete path ;
}

void wxDC::DoDrawPoint( wxCoord x, wxCoord y )
{
    wxCHECK_RET( Ok(), wxT("wxDC(cg)::DoDrawPoint - invalid DC") );

    DoDrawLine( x , y , x + 1 , y + 1 ) ;
}

void wxDC::DoDrawLines(int n, wxPoint points[],
                        wxCoord xoffset, wxCoord yoffset)
{
    wxCHECK_RET( Ok(), wxT("wxDC(cg)::DoDrawLines - invalid DC") );

#if !wxMAC_USE_CORE_GRAPHICS_BLEND_MODES
    if ( m_logicalFunction != wxCOPY )
        return ;
#endif

    wxCoord x1, x2 , y1 , y2 ;
    x1 = XLOG2DEVMAC(points[0].x + xoffset);
    y1 = YLOG2DEVMAC(points[0].y + yoffset);
    wxGraphicPath* path = m_graphicContext->CreatePath() ;
    path->MoveToPoint( x1 , y1 ) ;
    for (int i = 1; i < n; i++)
    {
        x2 = XLOG2DEVMAC(points[i].x + xoffset);
        y2 = YLOG2DEVMAC(points[i].y + yoffset);

        path->AddLineToPoint( x2 , y2 ) ;
    }

    m_graphicContext->StrokePath( path ) ;
    delete path ;
}

#if wxUSE_SPLINES