graphics.cpp

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

void wxMacCoreGraphicsContext::PopState()
{
    EnsureIsValid();

    CGContextRestoreGState( m_cgContext );
}

void wxMacCoreGraphicsContext::DrawText( const wxString &str, wxDouble x, wxDouble y )
{
    DrawText(str, x, y, 0.0);
}

void wxMacCoreGraphicsContext::DrawText( const wxString &str, wxDouble x, wxDouble y, wxDouble angle )
{
    if ( m_font.IsNull() )
        return;

    EnsureIsValid();

    OSStatus status = noErr;
    ATSUTextLayout atsuLayout;
    UniCharCount chars = str.length();
    UniChar* ubuf = NULL;

#if SIZEOF_WCHAR_T == 4
    wxMBConvUTF16 converter;
#if wxUSE_UNICODE
    size_t unicharlen = converter.WC2MB( NULL , str.wc_str() , 0 );
    ubuf = (UniChar*) malloc( unicharlen + 2 );
    converter.WC2MB( (char*) ubuf , str.wc_str(), unicharlen + 2 );
#else
    const wxWCharBuffer wchar = str.wc_str( wxConvLocal );
    size_t unicharlen = converter.WC2MB( NULL , wchar.data() , 0 );
    ubuf = (UniChar*) malloc( unicharlen + 2 );
    converter.WC2MB( (char*) ubuf , wchar.data() , unicharlen + 2 );
#endif
    chars = unicharlen / 2;
#else
#if wxUSE_UNICODE
    ubuf = (UniChar*) str.wc_str();
#else
    wxWCharBuffer wchar = str.wc_str( wxConvLocal );
    chars = wxWcslen( wchar.data() );
    ubuf = (UniChar*) wchar.data();
#endif
#endif

    ATSUStyle style = (((wxMacCoreGraphicsFontData*)m_font.GetRefData())->GetATSUStyle());
    status = ::ATSUCreateTextLayoutWithTextPtr( (UniCharArrayPtr) ubuf , 0 , chars , chars , 1 ,
        &chars , &style , &atsuLayout );

    wxASSERT_MSG( status == noErr , wxT("couldn't create the layout of the rotated text") );

    status = ::ATSUSetTransientFontMatching( atsuLayout , true );
    wxASSERT_MSG( status == noErr , wxT("couldn't setup transient font matching") );

    int iAngle = int( angle * RAD2DEG );
    if ( abs(iAngle) > 0 )
    {
        Fixed atsuAngle = IntToFixed( iAngle );
        ATSUAttributeTag atsuTags[] =
        {
            kATSULineRotationTag ,
        };
        ByteCount atsuSizes[sizeof(atsuTags) / sizeof(ATSUAttributeTag)] =
        {
            sizeof( Fixed ) ,
        };
        ATSUAttributeValuePtr    atsuValues[sizeof(atsuTags) / sizeof(ATSUAttributeTag)] =
        {
            &atsuAngle ,
        };
        status = ::ATSUSetLayoutControls(atsuLayout , sizeof(atsuTags) / sizeof(ATSUAttributeTag),
            atsuTags, atsuSizes, atsuValues );
    }

    {
        ATSUAttributeTag atsuTags[] =
        {
            kATSUCGContextTag ,
        };
        ByteCount atsuSizes[sizeof(atsuTags) / sizeof(ATSUAttributeTag)] =
        {
            sizeof( CGContextRef ) ,
        };
        ATSUAttributeValuePtr    atsuValues[sizeof(atsuTags) / sizeof(ATSUAttributeTag)] =
        {
            &m_cgContext ,
        };
        status = ::ATSUSetLayoutControls(atsuLayout , sizeof(atsuTags) / sizeof(ATSUAttributeTag),
            atsuTags, atsuSizes, atsuValues );
    }

    ATSUTextMeasurement textBefore, textAfter;
    ATSUTextMeasurement ascent, descent;

    status = ::ATSUGetUnjustifiedBounds( atsuLayout, kATSUFromTextBeginning, kATSUToTextEnd,
        &textBefore , &textAfter, &ascent , &descent );

    wxASSERT_MSG( status == noErr , wxT("couldn't measure the rotated text") );

    Rect rect;
    x += (int)(sin(angle) * FixedToInt(ascent));
    y += (int)(cos(angle) * FixedToInt(ascent));

    status = ::ATSUMeasureTextImage( atsuLayout, kATSUFromTextBeginning, kATSUToTextEnd,
        IntToFixed(x) , IntToFixed(y) , &rect );
    wxASSERT_MSG( status == noErr , wxT("couldn't measure the rotated text") );

    CGContextSaveGState(m_cgContext);
    CGContextTranslateCTM(m_cgContext, x, y);
    CGContextScaleCTM(m_cgContext, 1, -1);
    status = ::ATSUDrawText( atsuLayout, kATSUFromTextBeginning, kATSUToTextEnd,
        IntToFixed(0) , IntToFixed(0) );

    wxASSERT_MSG( status == noErr , wxT("couldn't draw the rotated text") );

    CGContextRestoreGState(m_cgContext);

    ::ATSUDisposeTextLayout(atsuLayout);

#if SIZEOF_WCHAR_T == 4
    free( ubuf );
#endif
}

void wxMacCoreGraphicsContext::GetTextExtent( const wxString &str, wxDouble *width, wxDouble *height,
                            wxDouble *descent, wxDouble *externalLeading ) const
{
    wxCHECK_RET( !m_font.IsNull(), wxT("wxDC(cg)::DoGetTextExtent - no valid font set") );

    OSStatus status = noErr;

    ATSUTextLayout atsuLayout;
    UniCharCount chars = str.length();
    UniChar* ubuf = NULL;

#if SIZEOF_WCHAR_T == 4
    wxMBConvUTF16 converter;
#if wxUSE_UNICODE
    size_t unicharlen = converter.WC2MB( NULL , str.wc_str() , 0 );
    ubuf = (UniChar*) malloc( unicharlen + 2 );
    converter.WC2MB( (char*) ubuf , str.wc_str(), unicharlen + 2 );
#else
    const wxWCharBuffer wchar = str.wc_str( wxConvLocal );
    size_t unicharlen = converter.WC2MB( NULL , wchar.data() , 0 );
    ubuf = (UniChar*) malloc( unicharlen + 2 );
    converter.WC2MB( (char*) ubuf , wchar.data() , unicharlen + 2 );
#endif
    chars = unicharlen / 2;
#else
#if wxUSE_UNICODE
    ubuf = (UniChar*) str.wc_str();
#else
    wxWCharBuffer wchar = str.wc_str( wxConvLocal );
    chars = wxWcslen( wchar.data() );
    ubuf = (UniChar*) wchar.data();
#endif
#endif

    ATSUStyle style = (((wxMacCoreGraphicsFontData*)m_font.GetRefData())->GetATSUStyle());
    status = ::ATSUCreateTextLayoutWithTextPtr( (UniCharArrayPtr) ubuf , 0 , chars , chars , 1 ,
        &chars , &style , &atsuLayout );

    wxASSERT_MSG( status == noErr , wxT("couldn't create the layout of the text") );

    ATSUTextMeasurement textBefore, textAfter;
    ATSUTextMeasurement textAscent, textDescent;

    status = ::ATSUGetUnjustifiedBounds( atsuLayout, kATSUFromTextBeginning, kATSUToTextEnd,
        &textBefore , &textAfter, &textAscent , &textDescent );

    if ( height )
        *height = FixedToInt(textAscent + textDescent);
    if ( descent )
        *descent = FixedToInt(textDescent);
    if ( externalLeading )
        *externalLeading = 0;
    if ( width )
        *width = FixedToInt(textAfter - textBefore);

    ::ATSUDisposeTextLayout(atsuLayout);
}

void wxMacCoreGraphicsContext::GetPartialTextExtents(const wxString& text, wxArrayDouble& widths) const
{
    widths.Empty();
    widths.Add(0, text.length());

    if (text.empty())
        return;

    ATSUTextLayout atsuLayout;
    UniCharCount chars = text.length();
    UniChar* ubuf = NULL;

#if SIZEOF_WCHAR_T == 4
    wxMBConvUTF16 converter;
#if wxUSE_UNICODE
    size_t unicharlen = converter.WC2MB( NULL , text.wc_str() , 0 );
    ubuf = (UniChar*) malloc( unicharlen + 2 );
    converter.WC2MB( (char*) ubuf , text.wc_str(), unicharlen + 2 );
#else
    const wxWCharBuffer wchar = text.wc_str( wxConvLocal );
    size_t unicharlen = converter.WC2MB( NULL , wchar.data() , 0 );
    ubuf = (UniChar*) malloc( unicharlen + 2 );
    converter.WC2MB( (char*) ubuf , wchar.data() , unicharlen + 2 );
#endif
    chars = unicharlen / 2;
#else
#if wxUSE_UNICODE
    ubuf = (UniChar*) text.wc_str();
#else
    wxWCharBuffer wchar = text.wc_str( wxConvLocal );
    chars = wxWcslen( wchar.data() );
    ubuf = (UniChar*) wchar.data();
#endif
#endif

    ATSUStyle style = (((wxMacCoreGraphicsFontData*)m_font.GetRefData())->GetATSUStyle());
    ::ATSUCreateTextLayoutWithTextPtr( (UniCharArrayPtr) ubuf , 0 , chars , chars , 1 ,
        &chars , &style , &atsuLayout );

    for ( int pos = 0; pos < (int)chars; pos ++ )
    {
        unsigned long actualNumberOfBounds = 0;
        ATSTrapezoid glyphBounds;

        // We get a single bound, since the text should only require one. If it requires more, there is an issue
        OSStatus result;
        result = ATSUGetGlyphBounds( atsuLayout, 0, 0, kATSUFromTextBeginning, pos + 1,
            kATSUseDeviceOrigins, 1, &glyphBounds, &actualNumberOfBounds );
        if (result != noErr || actualNumberOfBounds != 1 )
            return;

        widths[pos] = FixedToInt( glyphBounds.upperRight.x - glyphBounds.upperLeft.x );
        //unsigned char uch = s[i];
    }

    ::ATSUDisposeTextLayout(atsuLayout);
}

void * wxMacCoreGraphicsContext::GetNativeContext()
{
    return m_cgContext;
}

// concatenates this transform with the current transform of this context
void wxMacCoreGraphicsContext::ConcatTransform( const wxGraphicsMatrix& matrix )
{
    if ( m_cgContext )
        CGContextConcatCTM( m_cgContext, *(CGAffineTransform*) matrix.GetNativeMatrix());
    else
        m_windowTransform = CGAffineTransformConcat(m_windowTransform, *(CGAffineTransform*) matrix.GetNativeMatrix());
}

// sets the transform of this context
void wxMacCoreGraphicsContext::SetTransform( const wxGraphicsMatrix& matrix )
{
    if ( m_cgContext )
    {
        CGAffineTransform transform = CGContextGetCTM( m_cgContext );
        transform = CGAffineTransformInvert( transform ) ;
        CGContextConcatCTM( m_cgContext, transform);
        CGContextConcatCTM( m_cgContext, *(CGAffineTransform*) matrix.GetNativeMatrix());
    }
    else
    {
        m_windowTransform = *(CGAffineTransform*) matrix.GetNativeMatrix();
    }
}

// gets the matrix of this context
wxGraphicsMatrix wxMacCoreGraphicsContext::GetTransform() const
{
    wxGraphicsMatrix m = CreateMatrix();
    *((CGAffineTransform*) m.GetNativeMatrix()) = ( m_cgContext == NULL ? m_windowTransform :
        CGContextGetCTM( m_cgContext ));
    return m;
}

//
// Renderer
//

//-----------------------------------------------------------------------------
// wxMacCoreGraphicsRenderer declaration
//-----------------------------------------------------------------------------

class WXDLLIMPEXP_CORE wxMacCoreGraphicsRenderer : public wxGraphicsRenderer
{
public :
    wxMacCoreGraphicsRenderer() {}

    virtual ~wxMacCoreGraphicsRenderer() {}

    // Context

    virtual wxGraphicsContext * CreateContext( const wxWindowDC& dc);

    virtual wxGraphicsContext * CreateContextFromNativeContext( void * context );

    virtual wxGraphicsContext * CreateContextFromNativeWindow( void * window );

    virtual wxGraphicsContext * CreateContext( wxWindow* window );
    
    virtual wxGraphicsContext * CreateMeasuringContext();

    // Path

    virtual wxGraphicsPath CreatePath();

    // Matrix

    virtual wxGraphicsMatrix CreateMatrix( wxDouble a=1.0, wxDouble b=0.0, wxDouble c=0.0, wxDouble d=1.0,
        wxDouble tx=0.0, wxDouble ty=0.0);


    virtual wxGraphicsPen CreatePen(const wxPen& pen) ;

    virtual wxGraphicsBrush CreateBrush(const wxBrush& brush ) ;

    // sets the brush to a linear gradient, starting at (x1,y1) with color c1 to (x2,y2) with color c2
    virtual wxGraphicsBrush CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
        const wxColour&c1, const wxColour&c2) ;

    // sets the brush to a radial gradient originating at (xo,yc) with color oColor and ends on a circle around (xc,yc)
    // with radius r and color cColor
    virtual wxGraphicsBrush CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
        const wxColour &oColor, const wxColour &cColor) ;

   // sets the font
    virtual wxGraphicsFont CreateFont( const wxFont &font , const wxColour &col = *wxBLACK ) ;

private :
    DECLARE_DYNAMIC_CLASS_NO_COPY(wxMacCoreGraphicsRenderer)
} ;

//-----------------------------------------------------------------------------
// wxMacCoreGraphicsRenderer implementation
//-----------------------------------------------------------------------------

IMPLEMENT_DYNAMIC_CLASS(wxMacCoreGraphicsRenderer,wxGraphicsRenderer)

static wxMacCoreGraphicsRenderer gs_MacCoreGraphicsRenderer;

wxGraphicsRenderer* wxGraphicsRenderer::GetDefaultRenderer()
{
    return &gs_MacCoreGraphicsRenderer;
}

wxGraphicsContext * wxMacCoreGraphicsRenderer::CreateContext( const wxWindowDC& dc)
{
   return new wxMacCoreGraphicsContext(this,(CGContextRef)dc.GetWindow()->MacGetCGContextRef() );
}

wxGraphicsContext * wxMacCoreGraphicsRenderer::CreateContextFromNativeContext( void * context )
{
    return new wxMacCoreGraphicsContext(this,(CGContextRef)context);
}


wxGraphicsContext * wxMacCoreGraphicsRenderer::CreateContextFromNativeWindow( void * window )
{
    return new wxMacCoreGraphicsContext(this,(WindowRef)window);
}

wxGraphicsContext * wxMacCoreGraphicsRenderer::CreateContext( wxWindow* window )
{
    return new wxMacCoreGraphicsContext(this, window );
}

wxGraphicsContext * wxMacCoreGraphicsRenderer::CreateMeasuringContext()
{
    return new wxMacCoreGraphicsContext(this);
}

// Path

wxGraphicsPath wxMacCoreGraphicsRenderer::CreatePath()
{
    wxGraphicsPath m;
    m.SetRefData( new wxMacCoreGraphicsPathData(this));
    return m;
}


// Matrix

wxGraphicsMatrix wxMacCoreGraphicsRenderer::CreateMatrix( wxDouble a, wxDouble b, wxDouble c, wxDouble d,
    wxDouble tx, wxDouble ty)
{
    wxGraphicsMatrix m;
    wxMacCoreGraphicsMatrixData* data = new wxMacCoreGraphicsMatrixData( this );
    data->Set( a,b,c,d,tx,ty ) ;
    m.SetRefData(data);
    return m;
}

wxGraphicsPen wxMacCoreGraphicsRenderer::CreatePen(const wxPen& pen)
{
    if ( !pen.Ok() || pen.GetStyle() == wxTRANSPARENT )
        return wxNullGraphicsPen;
    else
    {
        wxGraphicsPen p;
        p.SetRefData(new wxMacCoreGraphicsPenData( this, pen ));
        return p;
    }
}

wxGraphicsBrush wxMacCo