dc.cpp

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

    wxMacFastPortSetter helper(this) ;

    wxCoord xx = XLOG2DEVMAC(x);
    wxCoord yy = YLOG2DEVMAC(y);
    wxCoord w = icon.GetWidth();
    wxCoord h = icon.GetHeight();
    wxCoord ww = XLOG2DEVREL(w);
    wxCoord hh = YLOG2DEVREL(h);

    Rect r = { yy , xx, yy + hh, xx + ww } ;
    PlotIconRef( &r , kAlignNone , kTransformNone , kPlotIconRefNormalFlags , MAC_WXHICON( icon.GetHICON() ) ) ;
}

void wxDC::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord width, wxCoord height )
{
    wxCHECK_RET(Ok(), wxT("wxDC::DoSetClippingRegion - invalid DC"));

    wxCoord xx, yy, ww, hh;
    xx = XLOG2DEVMAC(x);
    yy = YLOG2DEVMAC(y);
    ww = XLOG2DEVREL(width);
    hh = YLOG2DEVREL(height);

    SetRectRgn( (RgnHandle) m_macCurrentClipRgn , xx , yy , xx + ww , yy + hh ) ;
    SectRgn( (RgnHandle) m_macCurrentClipRgn , (RgnHandle) m_macBoundaryClipRgn , (RgnHandle) m_macCurrentClipRgn ) ;
    if ( m_clipping )
    {
        m_clipX1 = wxMax( m_clipX1 , xx );
        m_clipY1 = wxMax( m_clipY1 , yy );
        m_clipX2 = wxMin( m_clipX2, (xx + ww) );
        m_clipY2 = wxMin( m_clipY2, (yy + hh) );
    }
    else
    {
        m_clipping = true;
        m_clipX1 = xx;
        m_clipY1 = yy;
        m_clipX2 = xx + ww;
        m_clipY2 = yy + hh;
    }
}

void wxDC::DoSetClippingRegionAsRegion( const wxRegion &region )
{
    wxCHECK_RET(Ok(), wxT("wxDC::DoSetClippingRegionAsRegion - invalid DC"));

    wxMacFastPortSetter helper(this) ;
    wxCoord x, y, w, h;
    region.GetBox( x, y, w, h );
    wxCoord xx, yy, ww, hh;
    xx = XLOG2DEVMAC(x);
    yy = YLOG2DEVMAC(y);
    ww = XLOG2DEVREL(w);
    hh = YLOG2DEVREL(h);

    // if we have a scaling that we cannot map onto native regions
    // we must use the box
    if ( ww != w || hh != h )
    {
        wxDC::DoSetClippingRegion( x, y, w, h );
    }
    else
    {
        CopyRgn( (RgnHandle) region.GetWXHRGN() , (RgnHandle) m_macCurrentClipRgn ) ;
        if ( xx != x || yy != y )
            OffsetRgn( (RgnHandle) m_macCurrentClipRgn , xx - x , yy - y ) ;

        SectRgn( (RgnHandle) m_macCurrentClipRgn , (RgnHandle) m_macBoundaryClipRgn , (RgnHandle) m_macCurrentClipRgn ) ;
        if ( m_clipping )
        {
            m_clipX1 = wxMax( m_clipX1 , xx );
            m_clipY1 = wxMax( m_clipY1 , yy );
            m_clipX2 = wxMin( m_clipX2, (xx + ww) );
            m_clipY2 = wxMin( m_clipY2, (yy + hh) );
        }
        else
        {
            m_clipping = true;
            m_clipX1 = xx;
            m_clipY1 = yy;
            m_clipX2 = xx + ww;
            m_clipY2 = yy + hh;
        }
    }
}

void wxDC::DestroyClippingRegion()
{
    wxMacFastPortSetter helper(this) ;

    CopyRgn( (RgnHandle) m_macBoundaryClipRgn , (RgnHandle) m_macCurrentClipRgn ) ;
    ResetClipping();
}

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::SetTextForeground - invalid DC"));

    m_textForegroundColour = col;
    m_macFontInstalled = false ;
}

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

    m_textBackgroundColour = col;
    m_macFontInstalled = false ;
}

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;

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

    if (mode != wxMM_TEXT)
    {
        m_needComputeScaleX = true;
        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 )
{
    // is this still correct ?
    m_logicalOriginX = x * m_signX;
    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
{
    if ( IsPortColor( (CGrafPtr) m_macPort ) )
        return ( (**GetPortPixMap( (CGrafPtr) m_macPort)).pixelSize ) ;

    return 1 ;
}

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_internalDeviceOriginX + m_externalDeviceOriginX;
    m_deviceOriginY = m_internalDeviceOriginY + 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;
    m_macFontInstalled = false ;
}

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

    m_pen = pen;
    m_macPenInstalled = false ;
}

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

    m_brush = brush;
    m_macBrushInstalled = false ;
}

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

    m_backgroundBrush = brush;
    if (m_backgroundBrush.Ok())
        m_macBrushInstalled = false ;
}

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

    m_logicalFunction = function ;
    m_macFontInstalled = false ;
    m_macBrushInstalled = false ;
    m_macPenInstalled = false ;
}

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::DoGetPixel - invalid DC") );

    wxMacFastPortSetter helper(this) ;

    // NOTE: Get/SetCPixel are slow!
    RGBColor colour;
    GetCPixel( XLOG2DEVMAC(x), YLOG2DEVMAC(y), &colour );

    // 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::DoDrawLine - invalid DC"));

    wxMacFastPortSetter helper(this) ;

    if (m_pen.GetStyle() != wxTRANSPARENT)
    {
        MacInstallPen() ;
        wxCoord offset = ( (m_pen.GetWidth() == 0 ? 1 :
            m_pen.GetWidth() ) * (wxCoord)m_scaleX - 1) / 2;
        wxCoord xx1 = XLOG2DEVMAC(x1) - offset;
        wxCoord yy1 = YLOG2DEVMAC(y1) - offset;
        wxCoord xx2 = XLOG2DEVMAC(x2) - offset;
        wxCoord yy2 = YLOG2DEVMAC(y2) - offset;

        if ((m_pen.GetCap() == wxCAP_ROUND) &&
            (m_pen.GetWidth() <= 1))
        {
            // Implement LAST_NOT for MAC at least for
            // orthogonal lines. RR.
            if (xx1 == xx2)
            {
                if (yy1 < yy2)
                    yy2--;
                if (yy1 > yy2)
                    yy2++;
            }

            if (yy1 == yy2)
            {
                if (xx1 < xx2)
                    xx2--;
                if (xx1 > xx2)
                    xx2++;
            }
        }

        ::MoveTo(xx1, yy1);
        ::LineTo(xx2, yy2);
    }
}

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

    wxMacFastPortSetter helper(this) ;

    if (m_pen.GetStyle() != wxTRANSPARENT)
    {
        int w = 0, h = 0;

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

        MacInstallPen();
        ::MoveTo( XLOG2DEVMAC(0), yy );
        ::LineTo( XLOG2DEVMAC(w), yy );
        ::MoveTo( xx, YLOG2DEVMAC(0) );
        ::LineTo( xx, YLOG2DEVMAC(h) );
        CalcBoundingBox(x, y);
        CalcBoundingBox(x + w, y + h);
    }
}

/*
* To draw arcs properly the angles need to be converted from the WX style:
* Angles start on the +ve X axis and go anti-clockwise (As you would draw on
* a normal axis on paper).
* TO
* the Mac style:
* Angles start on the +ve y axis and go clockwise.
*/

static double wxConvertWXangleToMACangle(double angle)
{
    double newAngle = 90 - angle ;

    while ( newAngle > 360 )
        newAngle -= 360 ;
    while ( newAngle < 0 )
        newAngle += 360 ;

    return newAngle ;
}

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

    wxMacFastPortSetter helper(this) ;

    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 radius1, radius2;

    if (xx1 == xx2 && yy1 == yy2)
    {
        radius1 = 0.0;
        radius2 = 360.0;
    }
    else if (radius == 0.0)
    {
        radius1 = radius2 = 0.0;
    }
    else
    {
        radius1 = (xx1 - xxc == 0) ?
            (yy1 - yyc < 0) ? 90.0 : -90.0 :
        -atan2(double(yy1 - yyc), double(xx1 - xxc)) * RAD2DEG;
        radius2 = (xx2 - xxc == 0) ?
            (yy2 - yyc < 0) ? 90.0 : -90.0 :
        -atan2(double(yy2 - yyc), double(xx2 - xxc)) * RAD2DEG;
    }

    wxCoord alpha2 = wxCoord(radius2 - radius1);
    wxCoord alpha1 = wxCoord(wxConvertWXangleToMACangle(radius1));
    while ( alpha2 < 0 )
        alpha2 += 360 ;
    alpha2 = -alpha2 ;
    Rect r = { yyc - rad, xxc - rad, yyc + rad, xxc + rad };

    if (m_brush.GetStyle() != wxTRANSPARENT)
    {
        MacInstallBrush();
        PaintArc(&r, alpha1, alpha2);
    }