/////////////////////////////////////////////////////////////////////////////
// Name:        src/common/dcgraph.cpp
// Purpose:     graphics context methods common to all platforms
// Author:      Stefan Csomor
// Modified by:
// Created:
// Copyright:   (c) Stefan Csomor
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////
 
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
 
#if defined(__BORLANDC__)
    #pragma hdrstop
#endif
 
#if wxUSE_GRAPHICS_CONTEXT
 
#include "wx/dcgraph.h"
 
#ifndef WX_PRECOMP
    #include "wx/icon.h"
    #include "wx/dcclient.h"
    #include "wx/dcmemory.h"
    #include "wx/math.h"
    #include "wx/geometry.h"
#endif
 
//-----------------------------------------------------------------------------
// constants
//-----------------------------------------------------------------------------
 
static const double RAD2DEG = 180.0 / M_PI;
 
//-----------------------------------------------------------------------------
// Local functions
//-----------------------------------------------------------------------------
 
static wxCompositionMode TranslateRasterOp(wxRasterOperationMode function)
{
    switch ( function )
    {
        case wxCOPY: // src
            // since we are supporting alpha, _OVER is closer to the intention than _SOURCE
            // since the latter would overwrite even when alpha is not set to opaque
            return wxCOMPOSITION_OVER;
 
        case wxOR:         // src OR dst
            return wxCOMPOSITION_ADD;
 
        case wxNO_OP:      // dst
            return wxCOMPOSITION_DEST; // ignore the source
 
        case wxCLEAR:      // 0
            return wxCOMPOSITION_CLEAR;// clear dst
 
        case wxXOR:        // src XOR dst
            return wxCOMPOSITION_XOR;
 
        case wxAND:        // src AND dst
        case wxAND_INVERT: // (NOT src) AND dst
        case wxAND_REVERSE:// src AND (NOT dst)
        case wxEQUIV:      // (NOT src) XOR dst
        case wxINVERT:     // NOT dst
        case wxNAND:       // (NOT src) OR (NOT dst)
        case wxNOR:        // (NOT src) AND (NOT dst)
        case wxOR_INVERT:  // (NOT src) OR dst
        case wxOR_REVERSE: // src OR (NOT dst)
        case wxSET:        // 1
        case wxSRC_INVERT: // NOT src
            break;
    }
 
    return wxCOMPOSITION_INVALID;
}
 
//-----------------------------------------------------------------------------
// wxDC bridge class
//-----------------------------------------------------------------------------
 
wxIMPLEMENT_DYNAMIC_CLASS(wxGCDC, wxDC);
 
wxGCDC::wxGCDC(const wxWindowDC& dc) :
  wxDC( new wxGCDCImpl( this, dc ) )
{
}
 
wxGCDC::wxGCDC( const wxMemoryDC& dc) :
  wxDC( new wxGCDCImpl( this, dc ) )
{
}
 
#if wxUSE_PRINTING_ARCHITECTURE
wxGCDC::wxGCDC( const wxPrinterDC& dc) :
  wxDC( new wxGCDCImpl( this, dc ) )
{
}
#endif
 
#if defined(__WXMSW__) && wxUSE_ENH_METAFILE
wxGCDC::wxGCDC(const wxEnhMetaFileDC& dc)
   : wxDC(new wxGCDCImpl(this, dc))
{
}
#endif
 
wxGCDC::wxGCDC(wxGraphicsContext* context) :
    wxDC(new wxGCDCImpl(this, context))
{
}
 
wxGCDC::wxGCDC() :
  wxDC( new wxGCDCImpl( this ) )
{
}
 
wxGCDC::~wxGCDC()
{
}
 
wxIMPLEMENT_ABSTRACT_CLASS(wxGCDCImpl, wxDCImpl);
 
wxGCDCImpl::wxGCDCImpl(wxDC *owner, wxGraphicsContext* context) :
    wxDCImpl(owner)
{
    Init(context);
}
 
wxGCDCImpl::wxGCDCImpl( wxDC *owner ) :
   wxDCImpl( owner )
{
    Init(wxGraphicsContext::Create());
}
 
void wxGCDCImpl::SetGraphicsContext( wxGraphicsContext* ctx )
{
    delete m_graphicContext;
    m_graphicContext = ctx;
    if ( m_graphicContext )
    {
        m_matrixOriginal = m_graphicContext->GetTransform();
        m_ok = true;
        // apply the stored transformations to the passed in context
        ComputeScaleAndOrigin();
        m_graphicContext->SetFont( m_font , m_textForegroundColour );
        m_graphicContext->SetPen( m_pen );
        m_graphicContext->SetBrush( m_brush);
    }
}
 
wxGCDCImpl::wxGCDCImpl( wxDC *owner, const wxWindowDC& dc ) :
   wxDCImpl( owner )
{
    Init(wxGraphicsContext::Create(dc));
    m_window = dc.GetWindow();
}
 
wxGCDCImpl::wxGCDCImpl( wxDC *owner, const wxMemoryDC& dc ) :
   wxDCImpl( owner )
{
    Init(wxGraphicsContext::Create(dc));
}
 
#if wxUSE_PRINTING_ARCHITECTURE
wxGCDCImpl::wxGCDCImpl( wxDC *owner, const wxPrinterDC& dc ) :
   wxDCImpl( owner )
{
    Init(wxGraphicsContext::Create(dc));
}
#endif
 
#if defined(__WXMSW__) && wxUSE_ENH_METAFILE
wxGCDCImpl::wxGCDCImpl(wxDC *owner, const wxEnhMetaFileDC& dc)
   : wxDCImpl(owner)
{
    Init(wxGraphicsContext::Create(dc));
}
#endif
 
wxGCDCImpl::wxGCDCImpl(wxDC* owner, int)
   : wxDCImpl(owner)
{
    // derived class will set a context
    Init(NULL);
}
 
void wxGCDCImpl::Init(wxGraphicsContext* ctx)
{
    m_ok = false;
    m_colour = true;
    m_mm_to_pix_x = mm2pt;
    m_mm_to_pix_y = mm2pt;
 
    m_pen = *wxBLACK_PEN;
    m_font = *wxNORMAL_FONT;
    m_brush = *wxWHITE_BRUSH;
 
    m_isClipBoxValid = false;
 
    m_graphicContext = NULL;
    if (ctx)
        SetGraphicsContext(ctx);
 
    m_logicalFunctionSupported = true;
}
 
wxGCDCImpl::~wxGCDCImpl()
{
    delete m_graphicContext;
}
 
void wxGCDCImpl::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y,
                               bool useMask )
{
    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid DC") );
    wxCHECK_RET( bmp.IsOk(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid bitmap") );
 
    int w = bmp.GetScaledWidth();
    int h = bmp.GetScaledHeight();
    if ( bmp.GetDepth() == 1 )
    {
        m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
        m_graphicContext->SetBrush(m_textBackgroundColour);
        m_graphicContext->DrawRectangle( x, y, w, h );
        m_graphicContext->SetBrush(m_textForegroundColour);
        m_graphicContext->DrawBitmap( bmp, x, y, w, h );
        m_graphicContext->SetBrush( m_graphicContext->CreateBrush(m_brush));
        m_graphicContext->SetPen( m_graphicContext->CreatePen(m_pen));
    }
    else // not a monochrome bitmap, handle it normally
    {
        // make a copy in case we need to remove its mask, if we don't modify
        // it the copy is cheap as bitmaps are reference-counted
        wxBitmap bmpCopy(bmp);
        if ( !useMask && bmp.GetMask() )
            bmpCopy.SetMask(NULL);
 
        m_graphicContext->DrawBitmap( bmpCopy, x, y, w, h );
    }
 
    CalcBoundingBox(x, y);
    CalcBoundingBox(x + w, y + h);
}
 
void wxGCDCImpl::DoDrawIcon( const wxIcon &icon, wxCoord x, wxCoord y )
{
    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawIcon - invalid DC") );
    wxCHECK_RET( icon.IsOk(), wxT("wxGCDC(cg)::DoDrawIcon - invalid icon") );
 
    wxCoord w = icon.GetWidth();
    wxCoord h = icon.GetHeight();
 
    m_graphicContext->DrawIcon( icon , x, y, w, h );
 
    CalcBoundingBox(x, y);
    CalcBoundingBox(x + w, y + h);
}
 
bool wxGCDCImpl::StartDoc( const wxString& message )
{
    return m_graphicContext->StartDoc(message);
}
 
void wxGCDCImpl::EndDoc()
{
    m_graphicContext->EndDoc();
}
 
void wxGCDCImpl::StartPage()
{
    m_graphicContext->StartPage();
}
 
void wxGCDCImpl::EndPage()
{
    m_graphicContext->EndPage();
}
 
void wxGCDCImpl::Flush()
{
    m_graphicContext->Flush();
}
 
void wxGCDCImpl::UpdateClipBox()
{
    double x, y, w, h;
    m_graphicContext->GetClipBox(&x, &y, &w, &h);
 
    // We shouldn't reset m_clipping if the clipping region that we set happens
    // to be empty (e.g. because its intersection with the previous clipping
    // region was empty), but we should set it to true if we do have a valid
    // clipping region and it was false which may happen if the clipping region
    // set from the outside of wxWidgets code.
    if ( !m_clipping )
    {
        if ( w != 0. && h != 0. )
            m_clipping = true;
    }
 
    m_clipX1 = wxRound(x);
    m_clipY1 = wxRound(y);
    m_clipX2 = wxRound(x+w);
    m_clipY2 = wxRound(y+h);
    m_isClipBoxValid = true;
}
 
bool wxGCDCImpl::DoGetClippingRect(wxRect& rect) const
{
    wxCHECK_MSG( IsOk(), false, wxS("wxGCDC::DoGetClippingRegion - invalid GC") );
    // Check if we should retrieve the clipping region possibly not set
    // by SetClippingRegion() but modified by application: this can
    // happen when we're associated with an existing graphics context using
    // SetGraphicsContext() or when wxGCDC logical coordinates are transformed
    // with SetDeviceOrigin(), SetLogicalOrigin(), SetUserScale(), SetLogicalScale().
    if ( !m_isClipBoxValid )
    {
        wxGCDCImpl *self = wxConstCast(this, wxGCDCImpl);
        self->UpdateClipBox();
    }
 
    return wxDCImpl::DoGetClippingRect(rect);
}
 
void wxGCDCImpl::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord w, wxCoord h )
{
    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoSetClippingRegion - invalid DC") );
 
    // Generally, renderers accept negative values of width/height
    // but for internal calculations we need to have a box definition
    // in the standard form, with (x,y) pointing to the top-left
    // corner of the box and with non-negative width and height.
    if ( w < 0 )
    {
        w = -w;
        x -= (w - 1);
    }
    if ( h < 0 )
    {
        h = -h;
        y -= (h - 1);
    }
    m_graphicContext->Clip( x, y, w, h );
 
    m_clipping = true;
    UpdateClipBox();
}
 
void wxGCDCImpl::DoSetDeviceClippingRegion( const wxRegion &region )
{
    // region is in device coordinates
    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoSetDeviceClippingRegion - invalid DC") );
 
    // Because graphics context works with logical coordinates
    // and clipping region is given in device coordinates
    // we need temporarily reset graphics context's coordinate system
    // to the initial state in which logical and device coordinate
    // systems are equivalent.
    // So, at first save current transformation parameters.
    wxGraphicsMatrix currTransform = m_graphicContext->GetTransform();
    // Reset coordinate system with identity transformation matrix
    // to make logical coordinates the same as device coordinates.
    wxGraphicsMatrix m = m_graphicContext->CreateMatrix();
    m_graphicContext->SetTransform(m);
 
    // Set clipping region
    m_graphicContext->Clip(region);
 
    // Restore original transformation settings.
    m_graphicContext->SetTransform(currTransform);
 
    m_clipping = true;
    UpdateClipBox();
}
 
void wxGCDCImpl::DestroyClippingRegion()
{
    m_graphicContext->ResetClip();
    // currently the clip eg of a window extends to the area between the scrollbars
    // so we must explicitly make sure it only covers the area we want it to draw
    int width, height ;
    GetOwner()->GetSize( &width , &height ) ;
    m_graphicContext->Clip( DeviceToLogicalX(0) , DeviceToLogicalY(0) , DeviceToLogicalXRel(width), DeviceToLogicalYRel(height) );
 
    m_graphicContext->SetPen( m_pen );
    m_graphicContext->SetBrush( m_brush );
 
    wxDCImpl::DestroyClippingRegion();
    m_isClipBoxValid = false;
}
 
void wxGCDCImpl::DoGetSizeMM( int* width, int* height ) const
{
    int w = 0, h = 0;
 
    GetOwner()->GetSize( &w, &h );
    if (width)
        *width = long( double(w) / (m_scaleX * GetMMToPXx()) );
    if (height)
        *height = long( double(h) / (m_scaleY * GetMMToPXy()) );
}
 
void wxGCDCImpl::SetTextForeground( const wxColour &col )
{
    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::SetTextForeground - invalid DC") );
 
    // don't set m_textForegroundColour to an invalid colour as we'd crash
    // later then (we use m_textForegroundColour.GetColor() without checking
    // in a few places)
    if ( col.IsOk() )
    {
        m_textForegroundColour = col;
        m_graphicContext->SetFont( m_font, m_textForegroundColour );
    }
}
 
void wxGCDCImpl::SetTextBackground( const wxColour &col )
{
    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::SetTextBackground - invalid DC") );
 
    m_textBackgroundColour = col;
}
 
wxSize wxGCDCImpl::GetPPI() const
{
    if ( m_graphicContext )
    {
        wxDouble x, y;
        m_graphicContext->GetDPI(&x, &y);
        return wxSize(wxRound(x), wxRound(y));
    }
 
    // This is the same value that wxGraphicsContext::GetDPI() returns by
    // default.
    return wxSize(72, 72);
}
 
int wxGCDCImpl::GetDepth() const
{
    return 32;
}
 
void wxGCDCImpl::ComputeScaleAndOrigin()
{
    wxDCImpl::ComputeScaleAndOrigin();
 
    if ( m_graphicContext )
    {
        m_matrixCurrent = m_graphicContext->CreateMatrix();
 
        // the logical origin sets the origin to have new coordinates
        m_matrixCurrent.Translate( m_deviceOriginX - m_logicalOriginX * m_signX * m_scaleX,
                                   m_deviceOriginY - m_logicalOriginY * m_signY * m_scaleY);
 
        m_matrixCurrent.Scale( m_scaleX * m_signX, m_scaleY * m_signY );
 
        m_graphicContext->SetTransform( m_matrixOriginal );
#if wxUSE_DC_TRANSFORM_MATRIX
        // Concatenate extended transform (affine) with basic transform of coordinate system.
        wxGraphicsMatrix mtxExt = m_graphicContext->CreateMatrix(m_matrixExtTransform);
        m_matrixCurrent.Concat(mtxExt);
#endif // wxUSE_DC_TRANSFORM_MATRIX
        m_graphicContext->ConcatTransform( m_matrixCurrent );
        m_isClipBoxValid = false;
    }
}
 
void* wxGCDCImpl::GetHandle() const
{
    void* cgctx = NULL;
    wxGraphicsContext* gc = GetGraphicsContext();
    if (gc) {
        cgctx = gc->GetNativeContext();
    }
    return cgctx;
}
 
#if wxUSE_PALETTE
void wxGCDCImpl::SetPalette( const wxPalette& WXUNUSED(palette) )
{
 
}
#endif
 
void wxGCDCImpl::SetBackgroundMode( int mode )
{
    m_backgroundMode = mode;
}
 
void wxGCDCImpl::SetFont( const wxFont &font )
{
    m_font = font;
    if ( m_graphicContext )
    {
        m_graphicContext->SetFont(font, m_textForegroundColour);
    }
}
 
void wxGCDCImpl::SetPen( const wxPen &pen )
{
    m_pen = pen;
    if ( m_graphicContext )
    {
        m_graphicContext->SetPen( m_pen );
    }
}
 
void wxGCDCImpl::SetBrush( const wxBrush &brush )
{
    m_brush = brush;
    if ( m_graphicContext )
    {
        m_graphicContext->SetBrush( m_brush );
    }
}
 
void wxGCDCImpl::SetBackground( const wxBrush &brush )
{
    m_backgroundBrush = brush;
    if (!m_backgroundBrush.IsOk())
        return;
}
 
void wxGCDCImpl::SetLogicalFunction( wxRasterOperationMode function )
{
    m_logicalFunction = function;
 
    wxCompositionMode mode = TranslateRasterOp( function );
    m_logicalFunctionSupported = mode != wxCOMPOSITION_INVALID;
    if (m_logicalFunctionSupported)
        m_logicalFunctionSupported = m_graphicContext->SetCompositionMode(mode);
 
    if ( function == wxXOR )
        m_graphicContext->SetAntialiasMode(wxANTIALIAS_NONE);
    else
        m_graphicContext->SetAntialiasMode(wxANTIALIAS_DEFAULT);
}
 
// ----------------------------------------------------------------------------
// Transform matrix
// ----------------------------------------------------------------------------
 
#if wxUSE_DC_TRANSFORM_MATRIX
 
bool wxGCDCImpl::CanUseTransformMatrix() const
{
    return true;
}
 
bool wxGCDCImpl::SetTransformMatrix(const wxAffineMatrix2D &matrix)
{
    // Passed affine transform will be concatenated
    // with current basic transform of the coordinate system.
    m_matrixExtTransform = matrix;
    ComputeScaleAndOrigin();
    return true;
}
 
wxAffineMatrix2D wxGCDCImpl::GetTransformMatrix() const
{
    return m_matrixExtTransform;
}
 
void wxGCDCImpl::ResetTransformMatrix()
{
    // Reset affine transfrom matrix (extended) to identity matrix.
    m_matrixExtTransform.Set(wxMatrix2D(), wxPoint2DDouble());
    ComputeScaleAndOrigin();
}
 
#endif // wxUSE_DC_TRANSFORM_MATRIX
 
bool wxGCDCImpl::DoFloodFill(wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
                             const wxColour& WXUNUSED(col),
                             wxFloodFillStyle WXUNUSED(style))
{
    return false;
}
 
bool wxGCDCImpl::DoGetPixel( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y), wxColour *WXUNUSED(col) ) const
{
    //  wxCHECK_MSG( 0 , false, wxT("wxGCDC(cg)::DoGetPixel - not implemented") );
    return false;
}
 
void wxGCDCImpl::DoDrawLine( wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2 )
{
    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawLine - invalid DC") );
 
    if ( !m_logicalFunctionSupported )
        return;
 
    m_graphicContext->StrokeLine(x1,y1,x2,y2);
 
    CalcBoundingBox(x1, y1);
    CalcBoundingBox(x2, y2);
}
 
void wxGCDCImpl::DoCrossHair( wxCoord x, wxCoord y )
{
    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoCrossHair - invalid DC") );
 
    if ( !m_logicalFunctionSupported )
        return;
 
    int w = 0, h = 0;
 
    GetOwner()->GetSize( &w, &h );
 
    m_graphicContext->StrokeLine(0,y,w,y);
    m_graphicContext->StrokeLine(x,0,x,h);
 
    CalcBoundingBox(0, 0);
    CalcBoundingBox(w, h);
}
 
void wxGCDCImpl::DoDrawArc( wxCoord x1, wxCoord y1,
                        wxCoord x2, wxCoord y2,
                        wxCoord xc, wxCoord yc )
{
    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawArc - invalid DC") );
 
    if ( !m_logicalFunctionSupported )
        return;
 
    double dx = x1 - xc;
    double dy = y1 - yc;
    double radius = sqrt((double)(dx * dx + dy * dy));
    wxCoord rad = (wxCoord)radius;
    double sa, ea;
    if (x1 == x2 && y1 == y2)
    {
        sa = 0.0;
        ea = 360.0;
    }
    else if (radius == 0.0)
    {
        sa = ea = 0.0;
    }
    else
    {
        sa = (x1 - xc == 0) ?
     (y1 - yc < 0) ? 90.0 : -90.0 :
             -atan2(double(y1 - yc), double(x1 - xc)) * RAD2DEG;
        ea = (x2 - xc == 0) ?
     (y2 - yc < 0) ? 90.0 : -90.0 :
             -atan2(double(y2 - yc), double(x2 - xc)) * RAD2DEG;
    }
 
    bool fill = m_brush.GetStyle() != wxBRUSHSTYLE_TRANSPARENT;
 
    wxGraphicsPath path = m_graphicContext->CreatePath();
    if ( fill && ((x1!=x2)||(y1!=y2)) )
        path.MoveToPoint( xc, yc );
    // since these angles (ea,sa) are measured counter-clockwise, we invert them to
    // get clockwise angles
    path.AddArc( xc, yc , rad, wxDegToRad(-sa), wxDegToRad(-ea), false );
    if ( fill && ((x1!=x2)||(y1!=y2)) )
        path.AddLineToPoint( xc, yc );
    m_graphicContext->DrawPath(path);
 
    wxRect2DDouble box = path.GetBox();
    CalcBoundingBox(wxRound(box.m_x), wxRound(box.m_y));
    CalcBoundingBox(wxRound(box.m_x + box.m_width),
                    wxRound(box.m_y + box.m_height));
}
 
void wxGCDCImpl::DoDrawEllipticArc( wxCoord x, wxCoord y, wxCoord w, wxCoord h,
                                double sa, double ea )
{
    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawEllipticArc - invalid DC") );
 
    if ( !m_logicalFunctionSupported )
        return;
 
    wxCoord dx = x + w / 2.0;
    wxCoord dy = y + h / 2.0;
    wxDouble factor = ((wxDouble) w) / h;
    m_graphicContext->PushState();
    m_graphicContext->Translate(dx, dy);
    m_graphicContext->Scale(factor, 1.0);
    wxGraphicsPath path = m_graphicContext->CreatePath();
 
    // If end angle equals start angle we want draw a full ellipse.
    if (ea == sa)
    {
        ea += 360.0;
    }
    // since these angles (ea,sa) are measured counter-clockwise, we invert them to
    // get clockwise angles
    if ( m_brush.GetStyle() != wxBRUSHSTYLE_TRANSPARENT )
    {
        path.MoveToPoint( 0, 0 );
        path.AddArc( 0, 0, h/2.0, wxDegToRad(-sa), wxDegToRad(-ea), false );
        path.AddLineToPoint( 0, 0 );
        m_graphicContext->FillPath( path );
 
        path = m_graphicContext->CreatePath();
        path.AddArc( 0, 0, h/2.0, wxDegToRad(-sa), wxDegToRad(-ea), false );
        m_graphicContext->StrokePath( path );
    }
    else
    {
        path.AddArc( 0, 0, h/2.0, wxDegToRad(-sa), wxDegToRad(-ea), false );
        m_graphicContext->DrawPath( path );
    }
 
    wxRect2DDouble box = path.GetBox();
    // apply the transformation to the box
    box.m_x *= factor;
    box.m_width *= factor;
    box.m_x += dx;
    box.m_y += dy;
 
    CalcBoundingBox(wxRound(box.m_x), wxRound(box.m_y));
    CalcBoundingBox(wxRound(box.m_x + box.m_width),
                    wxRound(box.m_y + box.m_height));
 
    m_graphicContext->PopState();
}
 
void wxGCDCImpl::DoDrawPoint( wxCoord x, wxCoord y )
{
    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawPoint - invalid DC") );
 
    if (!m_logicalFunctionSupported)
        return;
 
#if defined(__WXMSW__) && wxUSE_GRAPHICS_GDIPLUS
    // single point path does not work with GDI+
    if (m_graphicContext->GetRenderer() == wxGraphicsRenderer::GetGDIPlusRenderer())
    {
        const double dx = 0.25 / m_scaleX;
        const double dy = 0.25 / m_scaleY;
        m_graphicContext->StrokeLine(x - dx, y - dy, x + dx, y + dy);
    }
    else
#endif
    {
#ifdef __WXOSX__
        m_graphicContext->StrokeLine(x, y, x, y);
#else
        wxGraphicsPath path(m_graphicContext->CreatePath());
        path.MoveToPoint(x, y);
        path.CloseSubpath();
        m_graphicContext->StrokePath(path);
#endif
    }
 
    CalcBoundingBox(x, y);
}
 
void wxGCDCImpl::DoDrawLines(int n, const wxPoint points[],
                         wxCoord xoffset, wxCoord yoffset)
{
    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawLines - invalid DC") );
    wxASSERT_MSG( n > 0, wxT("wxGCDC(cg)::DoDrawLines - number of points too small") );
 
    if ( !m_logicalFunctionSupported )
        return;
 
    int minX = points[0].x;
    int minY = points[0].y;
    int maxX = minX;
    int maxY = minY;
 
    wxPoint2DDouble* pointsD = new wxPoint2DDouble[n];
    for( int i = 0; i < n; ++i)
    {
        wxPoint p = points[i];
        pointsD[i].m_x = p.x + xoffset;
        pointsD[i].m_y = p.y + yoffset;
 
        if (p.x < minX)      minX = p.x;
        else if (p.x > maxX) maxX = p.x;
        if (p.y < minY)      minY = p.y;
        else if (p.y > maxY) maxY = p.y;
    }
 
    m_graphicContext->StrokeLines( n , pointsD);
    delete[] pointsD;
 
    CalcBoundingBox(minX + xoffset, minY + yoffset);
    CalcBoundingBox(maxX + xoffset, maxY + yoffset);
}
 
#if wxUSE_SPLINES
void wxGCDCImpl::DoDrawSpline(const wxPointList *points)
{
    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawSpline - invalid DC") );
 
    if ( !m_logicalFunctionSupported )
        return;
 
    wxGraphicsPath path = m_graphicContext->CreatePath();
 
    wxPointList::compatibility_iterator node = points->GetFirst();
    if ( !node )
        // empty list
        return;
 
    const wxPoint *p = node->GetData();
 
    wxCoord x1 = p->x;
    wxCoord y1 = p->y;
 
    node = node->GetNext();
    p = node->GetData();
 
    wxCoord x2 = p->x;
    wxCoord y2 = p->y;
    wxCoord cx1 = ( x1 + x2 ) / 2;
    wxCoord cy1 = ( y1 + y2 ) / 2;
 
    path.MoveToPoint( x1 , y1 );
    path.AddLineToPoint( cx1 , cy1 );
#if !wxUSE_STD_CONTAINERS
 
    while ((node = node->GetNext()) != NULL)
#else
 
    while ((node = node->GetNext()))
#endif // !wxUSE_STD_CONTAINERS
 
    {
        p = node->GetData();
        x1 = x2;
        y1 = y2;
        x2 = p->x;
        y2 = p->y;
        wxCoord cx4 = (x1 + x2) / 2;
        wxCoord cy4 = (y1 + y2) / 2;
 
        path.AddQuadCurveToPoint(x1 , y1 ,cx4 , cy4 );
 
        cx1 = cx4;
        cy1 = cy4;
    }
 
    path.AddLineToPoint( x2 , y2 );
 
    m_graphicContext->StrokePath( path );
 
    wxRect2DDouble box = path.GetBox();
    CalcBoundingBox(wxRound(box.m_x), wxRound(box.m_y));
    CalcBoundingBox(wxRound(box.m_x + box.m_width),
                    wxRound(box.m_y + box.m_height));
}
#endif // wxUSE_SPLINES
 
void wxGCDCImpl::DoDrawPolygon( int n, const wxPoint points[],
                                wxCoord xoffset, wxCoord yoffset,
                                wxPolygonFillMode fillStyle )
{
    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawPolygon - invalid DC") );
 
    if ( n <= 0 ||
            (m_brush.GetStyle() == wxBRUSHSTYLE_TRANSPARENT &&
                m_pen.GetStyle() == wxPENSTYLE_TRANSPARENT) )
        return;
    if ( !m_logicalFunctionSupported )
        return;
 
    bool closeIt = false;
    if (points[n-1] != points[0])
        closeIt = true;
 
    int minX = points[0].x;
    int minY = points[0].y;
    int maxX = minX;
    int maxY = minY;
 
    wxPoint2DDouble* pointsD = new wxPoint2DDouble[n+(closeIt?1:0)];
    for( int i = 0; i < n; ++i)
    {
        wxPoint p = points[i];
        pointsD[i].m_x = p.x + xoffset;
        pointsD[i].m_y = p.y + yoffset;
 
        if (p.x < minX)      minX = p.x;
        else if (p.x > maxX) maxX = p.x;
        if (p.y < minY)      minY = p.y;
        else if (p.y > maxY) maxY = p.y;
    }
    if ( closeIt )
        pointsD[n] = pointsD[0];
 
    m_graphicContext->DrawLines( n+(closeIt?1:0) , pointsD, fillStyle);
    delete[] pointsD;
 
    CalcBoundingBox(minX + xoffset, minY + yoffset);
    CalcBoundingBox(maxX + xoffset, maxY + yoffset);
}
 
void wxGCDCImpl::DoDrawPolyPolygon(int n,
                               const int count[],
                               const wxPoint points[],
                               wxCoord xoffset,
                               wxCoord yoffset,
                               wxPolygonFillMode fillStyle)
{
    wxASSERT(n > 1);
    wxGraphicsPath path = m_graphicContext->CreatePath();
 
    int i = 0;
    for ( int j = 0; j < n; ++j)
    {
        wxPoint start = points[i];
        path.MoveToPoint( start.x+ xoffset, start.y+ yoffset);
        ++i;
        int l = count[j];
        for ( int k = 1; k < l; ++k)
        {
            path.AddLineToPoint( points[i].x+ xoffset, points[i].y+ yoffset);
            ++i;
        }
        // close the polygon
        if ( start != points[i-1])
            path.AddLineToPoint( start.x+ xoffset, start.y+ yoffset);
    }
    m_graphicContext->DrawPath( path , fillStyle);
 
    wxRect2DDouble box = path.GetBox();
    CalcBoundingBox(wxRound(box.m_x), wxRound(box.m_y));
    CalcBoundingBox(wxRound(box.m_x + box.m_width),
                    wxRound(box.m_y + box.m_height));
}
 
void wxGCDCImpl::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
{
    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRectangle - invalid DC") );
 
    if ( !m_logicalFunctionSupported )
        return;
 
    // CMB: draw nothing if transformed w or h is 0
    if (w == 0 || h == 0)
        return;
 
    CalcBoundingBox(x, y);
    CalcBoundingBox(x + w, y + h);
 
    if (m_pen.IsOk() && m_pen.GetStyle() != wxPENSTYLE_TRANSPARENT && m_pen.GetWidth() > 0)
    {
        // outline is one pixel larger than what raster-based wxDC implementations draw
        w -= 1;
        h -= 1;
    }
    m_graphicContext->DrawRectangle(x,y,w,h);
}
 
void wxGCDCImpl::DoDrawRoundedRectangle(wxCoord x, wxCoord y,
                                    wxCoord w, wxCoord h,
                                    double radius)
{
    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRoundedRectangle - invalid DC") );
 
    if ( !m_logicalFunctionSupported )
        return;
 
    if (radius < 0.0)
        radius = - radius * ((w < h) ? w : h);
 
    // CMB: draw nothing if transformed w or h is 0
    if (w == 0 || h == 0)
        return;
 
    CalcBoundingBox(x, y);
    CalcBoundingBox(x + w, y + h);
 
    if (m_pen.IsOk() && m_pen.GetStyle() != wxPENSTYLE_TRANSPARENT && m_pen.GetWidth() > 0)
    {
        // outline is one pixel larger than what raster-based wxDC implementations draw
        w -= 1;
        h -= 1;
    }
    m_graphicContext->DrawRoundedRectangle( x,y,w,h,radius);
}
 
void wxGCDCImpl::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
{
    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawEllipse - invalid DC") );
 
    if ( !m_logicalFunctionSupported )
        return;
 
    CalcBoundingBox(x, y);
    CalcBoundingBox(x + w, y + h);
 
    m_graphicContext->DrawEllipse(x,y,w,h);
}
 
bool wxGCDCImpl::CanDrawBitmap() const
{
    return true;
}
 
bool wxGCDCImpl::DoBlit(
    wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
    wxDC *source, wxCoord xsrc, wxCoord ysrc,
    wxRasterOperationMode logical_func , bool useMask,
    wxCoord xsrcMask, wxCoord ysrcMask )
{
    return DoStretchBlit( xdest, ydest, width, height,
        source, xsrc, ysrc, width, height, logical_func, useMask,
        xsrcMask,ysrcMask );
}
 
bool wxGCDCImpl::DoStretchBlit(
    wxCoord xdest, wxCoord ydest, wxCoord dstWidth, wxCoord dstHeight,
    wxDC *source, wxCoord xsrc, wxCoord ysrc, wxCoord srcWidth, wxCoord srcHeight,
    wxRasterOperationMode logical_func , bool useMask,
    wxCoord xsrcMask, wxCoord ysrcMask )
{
    wxCHECK_MSG( IsOk(), false, wxT("wxGCDC(cg)::DoStretchBlit - invalid DC") );
    wxCHECK_MSG( source->IsOk(), false, wxT("wxGCDC(cg)::DoStretchBlit - invalid source DC") );
 
    if ( logical_func == wxNO_OP )
        return true;
 
    wxCompositionMode mode = TranslateRasterOp(logical_func);
    if ( mode == wxCOMPOSITION_INVALID )
    {
        wxFAIL_MSG( wxT("Blitting is not supported with this logical operation.") );
        return false;
    }
 
    wxRect subrect(source->LogicalToDeviceX(xsrc),
                   source->LogicalToDeviceY(ysrc),
                   source->LogicalToDeviceXRel(srcWidth),
                   source->LogicalToDeviceYRel(srcHeight));
    const wxRect subrectOrig = subrect;
    // clip the subrect down to the size of the source DC
    wxRect clip;
    source->GetSize(&clip.width, &clip.height);
    subrect.Intersect(clip);
    if (subrect.width == 0)
        return true;
 
    bool retval = true;
 
    wxCompositionMode formerMode = m_graphicContext->GetCompositionMode();
    if (m_graphicContext->SetCompositionMode(mode))
    {
        wxAntialiasMode formerAa = m_graphicContext->GetAntialiasMode();
        if (mode == wxCOMPOSITION_XOR)
        {
            m_graphicContext->SetAntialiasMode(wxANTIALIAS_NONE);
        }
 
        if (xsrcMask == -1 && ysrcMask == -1)
        {
            xsrcMask = xsrc;
            ysrcMask = ysrc;
        }
 
        wxBitmap blit = source->GetAsBitmap( &subrect );
 
        if ( blit.IsOk() )
        {
            if ( !useMask && blit.GetMask() )
                blit.SetMask(NULL);
 
            double x = xdest;
            double y = ydest;
            double w = dstWidth;
            double h = dstHeight;
            // adjust dest rect if source rect is clipped
            if (subrect.width != subrectOrig.width || subrect.height != subrectOrig.height)
            {
                x += (subrect.x - subrectOrig.x) / double(subrectOrig.width) * dstWidth;
                y += (subrect.y - subrectOrig.y) / double(subrectOrig.height) * dstHeight;
                w *= double(subrect.width) / subrectOrig.width;
                h *= double(subrect.height) / subrectOrig.height;
            }
            m_graphicContext->DrawBitmap(blit, x, y, w, h);
        }
        else
        {
            wxFAIL_MSG( wxT("Cannot Blit. Unable to get contents of DC as bitmap.") );
            retval = false;
        }
 
        if (mode == wxCOMPOSITION_XOR)
        {
            m_graphicContext->SetAntialiasMode(formerAa);
        }
    }
    // reset composition
    m_graphicContext->SetCompositionMode(formerMode);
 
    CalcBoundingBox(xdest, ydest);
    CalcBoundingBox(xdest + dstWidth, ydest + dstHeight);
 
    return retval;
}
 
void wxGCDCImpl::DoDrawRotatedText(const wxString& text, wxCoord x, wxCoord y,
                               double angle)
{
    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRotatedText - invalid DC") );
 
    if ( text.empty() )
        return;
    if ( !m_logicalFunctionSupported )
        return;
 
    // we test that we have some font because otherwise we should still use the
    // "else" part below to avoid that DrawRotatedText(angle = 180) and
    // DrawRotatedText(angle = 0) use different fonts (we can't use the default
    // font for drawing rotated fonts unfortunately)
    if ( (angle == 0.0) && m_font.IsOk() )
    {
        DoDrawText(text, x, y);
 
        // Bounding box already updated by DoDrawText(), no need to do it again.
        return;
    }
 
    // Get extent of whole text.
    wxCoord w, h, heightLine;
    GetOwner()->GetMultiLineTextExtent(text, &w, &h, &heightLine);
 
    // Compute the shift for the origin of the next line.
    const double rad = wxDegToRad(angle);
    const double dx = heightLine * sin(rad);
    const double dy = heightLine * cos(rad);
 
    // Draw all text line by line
    const wxArrayString lines = wxSplit(text, '\n', '\0');
    for ( size_t lineNum = 0; lineNum < lines.size(); lineNum++ )
    {
        // Calculate origin for each line to avoid accumulation of
        // rounding errors.
        if ( m_backgroundMode == wxBRUSHSTYLE_TRANSPARENT )
            m_graphicContext->DrawText( lines[lineNum], x + wxRound(lineNum*dx), y + wxRound(lineNum*dy), wxDegToRad(angle ));
        else
            m_graphicContext->DrawText( lines[lineNum], x + wxRound(lineNum*dx), y + wxRound(lineNum*dy), wxDegToRad(angle ), m_graphicContext->CreateBrush(m_textBackgroundColour) );
   }
 
    // call the bounding box by adding all four vertices of the rectangle
    // containing the text to it (simpler and probably not slower than
    // determining which of them is really topmost/leftmost/...)
 
    // "upper left" and "upper right"
    CalcBoundingBox(x, y);
    CalcBoundingBox(x + wxCoord(w*cos(rad)), y - wxCoord(w*sin(rad)));
 
    // "bottom left" and "bottom right"
    x += (wxCoord)(h*sin(rad));
    y += (wxCoord)(h*cos(rad));
    CalcBoundingBox(x, y);
    CalcBoundingBox(x + wxCoord(w*cos(rad)), y - wxCoord(w*sin(rad)));
}
 
void wxGCDCImpl::DoDrawText(const wxString& str, wxCoord x, wxCoord y)
{
    // For compatibility with other ports (notably wxGTK) and because it's
    // genuinely useful, we allow passing multiline strings to DrawText().
    // However there is no native OSX function to draw them directly so we
    // instead reuse the generic DrawLabel() method to render them. Of course,
    // DrawLabel() itself will call back to us but with single line strings
    // only so there won't be any infinite recursion here.
    if ( str.find('\n') != wxString::npos )
    {
        GetOwner()->DrawLabel(str, wxRect(x, y, 0, 0));
        return;
    }
 
    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawText - invalid DC") );
 
    if ( str.empty() )
        return;
 
    if ( !m_logicalFunctionSupported )
        return;
 
    if ( m_backgroundMode == wxBRUSHSTYLE_TRANSPARENT )
        m_graphicContext->DrawText( str, x ,y);
    else
        m_graphicContext->DrawText( str, x ,y , m_graphicContext->CreateBrush(m_textBackgroundColour) );
 
    wxCoord w, h;
    GetOwner()->GetTextExtent(str, &w, &h);
    CalcBoundingBox(x, y);
    CalcBoundingBox(x + w, y + h);
}
 
bool wxGCDCImpl::CanGetTextExtent() const
{
    wxCHECK_MSG( IsOk(), false, wxT("wxGCDC(cg)::CanGetTextExtent - invalid DC") );
 
    return true;
}
 
void wxGCDCImpl::DoGetTextExtent( const wxString &str, wxCoord *width, wxCoord *height,
                              wxCoord *descent, wxCoord *externalLeading ,
                              const wxFont *theFont ) const
{
    wxCHECK_RET( m_graphicContext, wxT("wxGCDC(cg)::DoGetTextExtent - invalid DC") );
 
    if ( theFont )
    {
        m_graphicContext->SetFont( *theFont, m_textForegroundColour );
    }
 
    wxDouble h , d , e , w;
 
    m_graphicContext->GetTextExtent( str, &w, &h, &d, &e );
 
    if ( height )
        *height = (wxCoord)(h+0.5);
    if ( descent )
        *descent = (wxCoord)(d+0.5);
    if ( externalLeading )
        *externalLeading = (wxCoord)(e+0.5);
    if ( width )
        *width = (wxCoord)(w+0.5);
 
    if ( theFont )
    {
        m_graphicContext->SetFont( m_font, m_textForegroundColour );
    }
}
 
bool wxGCDCImpl::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
{
    wxCHECK_MSG( m_graphicContext, false, wxT("wxGCDC(cg)::DoGetPartialTextExtents - invalid DC") );
    widths.Clear();
    widths.Add(0,text.Length());
    if ( text.IsEmpty() )
        return true;
 
    wxArrayDouble widthsD;
 
    m_graphicContext->GetPartialTextExtents( text, widthsD );
    for ( size_t i = 0; i < widths.GetCount(); ++i )
        widths[i] = (wxCoord)(widthsD[i] + 0.5);
 
    return true;
}
 
wxCoord wxGCDCImpl::GetCharWidth(void) const
{
    wxCoord width = 0;
    DoGetTextExtent( wxT("g") , &width , NULL , NULL , NULL , NULL );
 
    return width;
}
 
wxCoord wxGCDCImpl::GetCharHeight(void) const
{
    wxCoord height = 0;
    DoGetTextExtent( wxT("g") , NULL , &height , NULL , NULL , NULL );
 
    return height;
}
 
void wxGCDCImpl::Clear(void)
{
    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::Clear - invalid DC") );
 
    if ( m_backgroundBrush.IsOk() )
    {
        m_graphicContext->SetBrush( m_backgroundBrush );
        wxPen p = *wxTRANSPARENT_PEN;
        m_graphicContext->SetPen( p );
        wxCompositionMode formerMode = m_graphicContext->GetCompositionMode();
        m_graphicContext->SetCompositionMode(wxCOMPOSITION_SOURCE);
 
        double x, y, w, h;
        m_graphicContext->GetClipBox(&x, &y, &w, &h);
        m_graphicContext->DrawRectangle(x, y, w, h);
 
        m_graphicContext->SetCompositionMode(formerMode);
        m_graphicContext->SetPen( m_pen );
        m_graphicContext->SetBrush( m_brush );
    }
    else
    {
        double x, y, w, h;
        m_graphicContext->GetClipBox(&x, &y, &w, &h);
        m_graphicContext->ClearRectangle(x, y, w, h);
    }
}
 
void wxGCDCImpl::DoGetSize(int *width, int *height) const
{
    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoGetSize - invalid DC") );
    wxDouble w,h;
    m_graphicContext->GetSize( &w, &h );
    if ( height )
        *height = (int) (h+0.5);
    if ( width )
        *width = (int) (w+0.5);
}
 
void wxGCDCImpl::DoGradientFillLinear(const wxRect& rect,
                                  const wxColour& initialColour,
                                  const wxColour& destColour,
                                  wxDirection nDirection )
{
    wxPoint start;
    wxPoint end;
    switch( nDirection)
    {
    case wxWEST :
        start = rect.GetRightBottom();
        start.x++;
        end = rect.GetLeftBottom();
        break;
    case wxEAST :
        start = rect.GetLeftBottom();
        end = rect.GetRightBottom();
        end.x++;
        break;
    case wxNORTH :
        start = rect.GetLeftBottom();
        start.y++;
        end = rect.GetLeftTop();
        break;
    case wxSOUTH :
        start = rect.GetLeftTop();
        end = rect.GetLeftBottom();
        end.y++;
        break;
    default :
        break;
    }
 
    if (rect.width == 0 || rect.height == 0)
        return;
 
    m_graphicContext->SetBrush( m_graphicContext->CreateLinearGradientBrush(
        start.x,start.y,end.x,end.y, initialColour, destColour));
    m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
    m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
    m_graphicContext->SetPen(m_pen);
    m_graphicContext->SetBrush(m_brush);
 
    CalcBoundingBox(rect.x, rect.y);
    CalcBoundingBox(rect.x + rect.width, rect.y + rect.height);
}
 
void wxGCDCImpl::DoGradientFillConcentric(const wxRect& rect,
                                      const wxColour& initialColour,
                                      const wxColour& destColour,
                                      const wxPoint& circleCenter)
{
    //Radius
    wxInt32 cx = rect.GetWidth() / 2;
    wxInt32 cy = rect.GetHeight() / 2;
    wxInt32 nRadius;
    if (cx < cy)
        nRadius = cx;
    else
        nRadius = cy;
 
    // make sure the background is filled (todo move into specific platform implementation ?)
    m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
    m_graphicContext->SetBrush( wxBrush( destColour) );
    m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
 
    m_graphicContext->SetBrush( m_graphicContext->CreateRadialGradientBrush(
        rect.x+circleCenter.x,rect.y+circleCenter.y,
        rect.x+circleCenter.x,rect.y+circleCenter.y,
        nRadius,initialColour,destColour));
 
    m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
    m_graphicContext->SetPen(m_pen);
    m_graphicContext->SetBrush(m_brush);
 
    CalcBoundingBox(rect.x, rect.y);
    CalcBoundingBox(rect.x + rect.width, rect.y + rect.height);
}
 
void wxGCDCImpl::DoDrawCheckMark(wxCoord x, wxCoord y,
                             wxCoord width, wxCoord height)
{
    wxDCImpl::DoDrawCheckMark(x,y,width,height);
}
 
#ifdef __WXMSW__
wxRect wxGCDCImpl::MSWApplyGDIPlusTransform(const wxRect& r) const
{
    wxCHECK_MSG( IsOk(), r, wxS("Invalid wxGCDC") );
 
    double x = 0,
           y = 0;
    m_graphicContext->GetTransform().TransformPoint(&x, &y);
 
    wxRect rect(r);
    rect.Offset(x, y);
 
    return rect;
}
#endif // __WXMSW__
 
#endif // wxUSE_GRAPHICS_CONTEXT