X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/55d99c7a77789ff4904bf96eddca3715eb5af9b9..80a779275ae04443c568dca919adb26cf6f5002c:/src/common/dcbase.cpp

diff --git a/src/common/dcbase.cpp b/src/common/dcbase.cpp
index f239d3bc01..84ac42aa3c 100644
--- a/src/common/dcbase.cpp
+++ b/src/common/dcbase.cpp
@@ -1,11 +1,11 @@
 /////////////////////////////////////////////////////////////////////////////
-// Name:        common/dcbase.cpp
+// Name:        src/common/dcbase.cpp
 // Purpose:     generic methods of the wxDC Class
 // Author:      Vadim Zeitlin
 // Modified by:
 // Created:     05/25/99
 // RCS-ID:      $Id$
-// Copyright:   (c) wxWindows team
+// Copyright:   (c) wxWidgets team
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
@@ -13,10 +13,6 @@
 // declarations
 // ============================================================================
 
-#ifdef __GNUG__
-    #pragma implementation "dcbase.h"
-#endif
-
 // ----------------------------------------------------------------------------
 // headers
 // ----------------------------------------------------------------------------
@@ -29,15 +25,33 @@
 #endif
 
 #include "wx/dc.h"
+#include "wx/dcbuffer.h" // for IMPLEMENT_DYNAMIC_CLASS
 
-#include <math.h>
+#ifndef WX_PRECOMP
+    #include "wx/math.h"
+#endif
 
-// bool wxDCBase::sm_cacheing = FALSE;
+// bool wxDCBase::sm_cacheing = false;
+
+IMPLEMENT_ABSTRACT_CLASS(wxDCBase, wxObject)
 
 // ============================================================================
 // implementation
 // ============================================================================
 
+IMPLEMENT_DYNAMIC_CLASS(wxBufferedDC, wxMemoryDC)
+IMPLEMENT_ABSTRACT_CLASS(wxBufferedPaintDC, wxBufferedDC)
+
+#if WXWIN_COMPATIBILITY_2_6
+void wxDCBase::BeginDrawing()
+{
+}
+
+void wxDCBase::EndDrawing()
+{
+}
+#endif // WXWIN_COMPATIBILITY_2_6
+
 // ----------------------------------------------------------------------------
 // special symbols
 // ----------------------------------------------------------------------------
@@ -73,7 +87,7 @@ void wxDCBase::DrawLines(const wxList *list, wxCoord xoffset, wxCoord yoffset)
     wxPoint *points = new wxPoint[n];
 
     int i = 0;
-    for ( wxNode *node = list->GetFirst(); node; node = node->GetNext(), i++ )
+    for ( wxList::compatibility_iterator node = list->GetFirst(); node; node = node->GetNext(), i++ )
     {
         wxPoint *point = (wxPoint *)node->GetData();
         points[i].x = point->x;
@@ -94,7 +108,7 @@ void wxDCBase::DrawPolygon(const wxList *list,
     wxPoint *points = new wxPoint[n];
 
     int i = 0;
-    for ( wxNode *node = list->GetFirst(); node; node = node->GetNext(), i++ )
+    for ( wxList::compatibility_iterator node = list->GetFirst(); node; node = node->GetNext(), i++ )
     {
         wxPoint *point = (wxPoint *)node->GetData();
         points[i].x = point->x;
@@ -106,6 +120,49 @@ void wxDCBase::DrawPolygon(const wxList *list,
     delete [] points;
 }
 
+void
+wxDCBase::DoDrawPolyPolygon(int n,
+                            int count[],
+                            wxPoint points[],
+                            wxCoord xoffset, wxCoord yoffset,
+                            int fillStyle)
+{
+    if ( n == 1 )
+    {
+        DoDrawPolygon(count[0], points, xoffset, yoffset, fillStyle);
+        return;
+    }
+
+    int      i, j, lastOfs;
+    wxPoint* pts;
+    wxPen    pen;
+
+    for (i = j = lastOfs = 0; i < n; i++)
+    {
+        lastOfs = j;
+        j      += count[i];
+    }
+    pts = new wxPoint[j+n-1];
+    for (i = 0; i < j; i++)
+        pts[i] = points[i];
+    for (i = 2; i <= n; i++)
+    {
+        lastOfs -= count[n-i];
+        pts[j++] = pts[lastOfs];
+    }
+
+    pen = GetPen();
+    SetPen(wxPen(*wxBLACK, 0, wxTRANSPARENT));
+    DoDrawPolygon(j, pts, xoffset, yoffset, fillStyle);
+    SetPen(pen);
+    for (i = j = 0; i < n; i++)
+    {
+        DoDrawLines(count[i], pts+j, xoffset, yoffset);
+        j += count[i];
+    }
+    delete[] pts;
+}
+
 // ----------------------------------------------------------------------------
 // splines
 // ----------------------------------------------------------------------------
@@ -131,7 +188,7 @@ void wxDCBase::DrawSpline(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2, wxCoor
 
     DrawSpline(&point_list);
 
-    for( wxNode *node = point_list.GetFirst(); node; node = node->GetNext() )
+    for( wxList::compatibility_iterator node = point_list.GetFirst(); node; node = node->GetNext() )
     {
         wxPoint *p = (wxPoint *)node->GetData();
         delete p;
@@ -248,18 +305,18 @@ static bool wx_spline_add_point(double x, double y)
   point->x = (int) x;
   point->y = (int) y;
   wx_spline_point_list.Append((wxObject*)point);
-  return TRUE;
+  return true;
 }
 
 static void wx_spline_draw_point_array(wxDCBase *dc)
 {
   dc->DrawLines(&wx_spline_point_list, 0, 0 );
-  wxNode *node = wx_spline_point_list.GetFirst();
+  wxList::compatibility_iterator node = wx_spline_point_list.GetFirst();
   while (node)
   {
     wxPoint *point = (wxPoint *)node->GetData();
     delete point;
-    delete node;
+    wx_spline_point_list.Erase(node);
     node = wx_spline_point_list.GetFirst();
   }
 }
@@ -272,7 +329,11 @@ void wxDCBase::DoDrawSpline( wxList *points )
     double           cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4;
     double           x1, y1, x2, y2;
 
-    wxNode *node = points->GetFirst();
+    wxList::compatibility_iterator node = points->GetFirst();
+    if (node == wxList::compatibility_iterator())
+        // empty list
+        return;
+
     p = (wxPoint *)node->GetData();
 
     x1 = p->x;
@@ -290,7 +351,11 @@ void wxDCBase::DoDrawSpline( wxList *points )
 
     wx_spline_add_point(x1, y1);
 
-    while ((node = node->GetNext()) != NULL)
+    while ((node = node->GetNext())
+#if !wxUSE_STL
+           != NULL
+#endif // !wxUSE_STL
+          )
     {
         p = (wxPoint *)node->GetData();
         x1 = x2;
@@ -318,6 +383,85 @@ void wxDCBase::DoDrawSpline( wxList *points )
 
 #endif // wxUSE_SPLINES
 
+// ----------------------------------------------------------------------------
+// Partial Text Extents
+// ----------------------------------------------------------------------------
+
+
+// Each element of the widths array will be the width of the string up to and
+// including the corresponding character in text.  This is the generic
+// implementation, the port-specific classes should do this with native APIs
+// if available and if faster.  Note: pango_layout_index_to_pos is much slower
+// than calling GetTextExtent!!
+
+#define FWC_SIZE 256
+
+class FontWidthCache
+{
+public:
+    FontWidthCache() : m_scaleX(1), m_widths(NULL) { }
+    ~FontWidthCache() { delete []m_widths; }
+
+    void Reset()
+    {
+        if (!m_widths)
+            m_widths = new int[FWC_SIZE];
+
+        memset(m_widths, 0, sizeof(int)*FWC_SIZE);
+    }
+
+    wxFont m_font;
+    double m_scaleX;
+    int *m_widths;
+};
+
+static FontWidthCache s_fontWidthCache;
+
+bool wxDCBase::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
+{
+    int totalWidth = 0;
+
+    const size_t len = text.length();
+    widths.Empty();
+    widths.Add(0, len);
+
+    // reset the cache if font or horizontal scale have changed
+    if ( !s_fontWidthCache.m_widths ||
+         !wxIsSameDouble(s_fontWidthCache.m_scaleX, m_scaleX) ||
+         (s_fontWidthCache.m_font != GetFont()) )
+    {
+        s_fontWidthCache.Reset();
+        s_fontWidthCache.m_font = GetFont();
+        s_fontWidthCache.m_scaleX = m_scaleX;
+    }
+
+    // Calculate the position of each character based on the widths of
+    // the previous characters
+    int w, h;
+    for ( size_t i = 0; i < len; i++ )
+    {
+        const wxChar c = text[i];
+        unsigned int c_int = (unsigned int)c;
+
+        if ((c_int < FWC_SIZE) && (s_fontWidthCache.m_widths[c_int] != 0))
+        {
+            w = s_fontWidthCache.m_widths[c_int];
+        }
+        else
+        {
+            GetTextExtent(c, &w, &h);
+            if (c_int < FWC_SIZE)
+                s_fontWidthCache.m_widths[c_int] = w;
+        }
+
+        totalWidth += w;
+        widths[i] = totalWidth;
+    }
+
+    return true;
+}
+
+
 // ----------------------------------------------------------------------------
 // enhanced text drawing
 // ----------------------------------------------------------------------------
@@ -445,7 +589,7 @@ void wxDCBase::DrawLabel(const wxString& text,
             width0 = width;
     if ( bitmap.Ok() )
     {
-        DrawBitmap(bitmap, x, y, TRUE /* use mask */);
+        DrawBitmap(bitmap, x, y, true /* use mask */);
 
         wxCoord offset = bitmap.GetWidth() + 4;
         x += offset;
@@ -544,3 +688,821 @@ void wxDCBase::DrawLabel(const wxString& text,
     CalcBoundingBox(x0, y0);
     CalcBoundingBox(x0 + width0, y0 + height);
 }
+
+
+void wxDCBase::DoGradientFillLinear(const wxRect& rect,
+                                    const wxColour& initialColour,
+                                    const wxColour& destColour,
+                                    wxDirection nDirection)
+{
+    // save old pen
+    wxPen oldPen = m_pen;
+
+    wxUint8 nR1 = destColour.Red();
+    wxUint8 nG1 = destColour.Green();
+    wxUint8 nB1 = destColour.Blue();
+    wxUint8 nR2 = initialColour.Red();
+    wxUint8 nG2 = initialColour.Green();
+    wxUint8 nB2 = initialColour.Blue();
+    wxUint8 nR, nG, nB;
+
+    if ( nDirection == wxEAST || nDirection == wxWEST )
+    {
+        wxInt32 x = rect.GetWidth();
+        wxInt32 w = x;              // width of area to shade
+        wxInt32 xDelta = w/256;     // height of one shade bend
+        if (xDelta < 1)
+            xDelta = 1;
+
+        while (x >= xDelta)
+        {
+            x -= xDelta;
+            if (nR1 > nR2)
+                nR = nR1 - (nR1-nR2)*(w-x)/w;
+            else
+                nR = nR1 + (nR2-nR1)*(w-x)/w;
+
+            if (nG1 > nG2)
+                nG = nG1 - (nG1-nG2)*(w-x)/w;
+            else
+                nG = nG1 + (nG2-nG1)*(w-x)/w;
+
+            if (nB1 > nB2)
+                nB = nB1 - (nB1-nB2)*(w-x)/w;
+            else
+                nB = nB1 + (nB2-nB1)*(w-x)/w;
+
+            SetPen(wxPen(wxColour(nR, nG, nB), 1, wxSOLID));
+            if(nDirection == wxEAST)
+                DrawRectangle(rect.GetLeft()+x, rect.GetTop(),
+                        xDelta, rect.GetHeight());
+            else //nDirection == wxWEST
+                DrawRectangle(rect.GetRight()-x-xDelta, rect.GetTop(),
+                        xDelta, rect.GetHeight());
+        }
+    }
+    else  // nDirection == wxNORTH || nDirection == wxSOUTH
+    {
+        wxInt32 y = rect.GetHeight();
+        wxInt32 w = y;              // height of area to shade
+        wxInt32 yDelta = w/255;     // height of one shade bend
+        if (yDelta < 1)
+            yDelta = 1;
+
+        while (y > 0)
+        {
+            y -= yDelta;
+            if (nR1 > nR2)
+                nR = nR1 - (nR1-nR2)*(w-y)/w;
+            else
+                nR = nR1 + (nR2-nR1)*(w-y)/w;
+
+            if (nG1 > nG2)
+                nG = nG1 - (nG1-nG2)*(w-y)/w;
+            else
+                nG = nG1 + (nG2-nG1)*(w-y)/w;
+
+            if (nB1 > nB2)
+                nB = nB1 - (nB1-nB2)*(w-y)/w;
+            else
+                nB = nB1 + (nB2-nB1)*(w-y)/w;
+
+            SetPen(wxPen(wxColour(nR, nG, nB), 1, wxSOLID));
+            if(nDirection == wxNORTH)
+                DrawRectangle(rect.GetLeft(), rect.GetTop()+y,
+                        rect.GetWidth(), yDelta);
+            else //nDirection == wxSOUTH
+                DrawRectangle(rect.GetLeft(), rect.GetBottom()-y-yDelta,
+                        rect.GetWidth(), yDelta);
+        }
+    }
+
+    SetPen(oldPen);
+}
+
+void wxDCBase::DoGradientFillConcentric(const wxRect& rect,
+                                      const wxColour& initialColour,
+                                      const wxColour& destColour,
+                                      const wxPoint& circleCenter)
+{
+    //save the old pen color
+    wxColour oldPenColour = m_pen.GetColour();
+
+    wxUint8 nR1 = destColour.Red();
+    wxUint8 nG1 = destColour.Green();
+    wxUint8 nB1 = destColour.Blue();
+    wxUint8 nR2 = initialColour.Red();
+    wxUint8 nG2 = initialColour.Green();
+    wxUint8 nB2 = initialColour.Blue();
+    wxUint8 nR, nG, nB;
+
+
+    //Radius
+    wxInt32 cx = rect.GetWidth() / 2;
+    wxInt32 cy = rect.GetHeight() / 2;
+    wxInt32 nRadius;
+    if (cx < cy)
+        nRadius = cx;
+    else
+        nRadius = cy;
+
+    //Offset of circle
+    wxInt32 nCircleOffX = circleCenter.x - (rect.GetWidth() / 2);
+    wxInt32 nCircleOffY = circleCenter.y - (rect.GetHeight() / 2);
+
+    for ( wxInt32 x = 0; x < rect.GetWidth(); x++ )
+    {
+        for ( wxInt32 y = 0; y < rect.GetHeight(); y++ )
+        {
+            //get color difference
+            wxInt32 nGradient = ((nRadius -
+                                  (wxInt32)sqrt(
+                                    pow((double)(x - cx - nCircleOffX), 2) +
+                                    pow((double)(y - cy - nCircleOffY), 2)
+                                  )) * 100) / nRadius;
+
+            //normalize Gradient
+            if (nGradient < 0 )
+                nGradient = 0;
+
+            //get dest colors
+            nR = (wxUint8)(nR1 + ((nR2 - nR1) * nGradient / 100));
+            nG = (wxUint8)(nG1 + ((nG2 - nG1) * nGradient / 100));
+            nB = (wxUint8)(nB1 + ((nB2 - nB1) * nGradient / 100));
+
+            //set the pixel
+            m_pen.SetColour(wxColour(nR,nG,nB));
+            DrawPoint(wxPoint(x + rect.GetLeft(), y + rect.GetTop()));
+        }
+    }
+    //return old pen color
+    m_pen.SetColour(oldPenColour);
+}
+
+/*
+Notes for wxWidgets DrawEllipticArcRot(...)
+
+wxDCBase::DrawEllipticArcRot(...) draws a rotated elliptic arc or an ellipse.
+It uses wxDCBase::CalculateEllipticPoints(...) and wxDCBase::Rotate(...),
+which are also new.
+
+All methods are generic, so they can be implemented in wxDCBase.
+DoDrawEllipticArcRot(...) is virtual, so it can be called from deeper
+methods like (WinCE) wxDC::DoDrawArc(...).
+
+CalculateEllipticPoints(...) fills a given list of wxPoints with some points
+of an elliptic arc. The algorithm is pixel-based: In every row (in flat
+parts) or every column (in steep parts) only one pixel is calculated.
+Trigonometric calculation (sin, cos, tan, atan) is only done if the
+starting angle is not equal to the ending angle. The calculation of the
+pixels is done using simple arithmetic only and should perform not too
+bad even on devices without floating point processor. I didn't test this yet.
+
+Rotate(...) rotates a list of point pixel-based, you will see rounding errors.
+For instance: an ellipse rotated 180 degrees is drawn
+slightly different from the original.
+
+The points are then moved to an array and used to draw a polyline and/or polygon
+(with center added, the pie).
+The result looks quite similar to the native ellipse, only e few pixels differ.
+
+The performance on a desktop system (Athlon 1800, WinXP) is about 7 times
+slower as DrawEllipse(...), which calls the native API.
+An rotated ellipse outside the clipping region takes nearly the same time,
+while an native ellipse outside takes nearly no time to draw.
+
+If you draw an arc with this new method, you will see the starting and ending angles
+are calculated properly.
+If you use DrawEllipticArc(...), you will see they are only correct for circles
+and not properly calculated for ellipses.
+
+Peter Lenhard
+p.lenhard@t-online.de
+*/
+
+#ifdef __WXWINCE__
+void wxDCBase::DoDrawEllipticArcRot( wxCoord x, wxCoord y,
+                                     wxCoord w, wxCoord h,
+                                     double sa, double ea, double angle )
+{
+    wxList list;
+
+    CalculateEllipticPoints( &list, x, y, w, h, sa, ea );
+    Rotate( &list, angle, wxPoint( x+w/2, y+h/2 ) );
+
+    // Add center (for polygon/pie)
+    list.Append( (wxObject*) new wxPoint( x+w/2, y+h/2 ) );
+
+    // copy list into array and delete list elements
+    int n = list.GetCount();
+    wxPoint *points = new wxPoint[n];
+    int i = 0;
+    wxNode* node = 0;
+    for ( node = list.GetFirst(); node; node = node->GetNext(), i++ )
+    {
+        wxPoint *point = (wxPoint *)node->GetData();
+        points[i].x = point->x;
+        points[i].y = point->y;
+        delete point;
+    }
+
+    // first draw the pie without pen, if necessary
+    if( GetBrush() != *wxTRANSPARENT_BRUSH )
+    {
+        wxPen tempPen( GetPen() );
+        SetPen( *wxTRANSPARENT_PEN );
+        DoDrawPolygon( n, points, 0, 0 );
+        SetPen( tempPen );
+    }
+
+    // then draw the arc without brush, if necessary
+    if( GetPen() != *wxTRANSPARENT_PEN )
+    {
+        // without center
+        DoDrawLines( n-1, points, 0, 0 );
+    }
+
+    delete [] points;
+
+} // DrawEllipticArcRot
+
+void wxDCBase::Rotate( wxList* points, double angle, wxPoint center )
+{
+    if( angle != 0.0 )
+    {
+        double pi(M_PI);
+        double dSinA = -sin(angle*2.0*pi/360.0);
+        double dCosA = cos(angle*2.0*pi/360.0);
+        for ( wxNode* node = points->GetFirst(); node; node = node->GetNext() )
+        {
+            wxPoint* point = (wxPoint*)node->GetData();
+
+            // transform coordinates, if necessary
+            if( center.x ) point->x -= center.x;
+            if( center.y ) point->y -= center.y;
+
+            // calculate rotation, rounding simply by implicit cast to integer
+            int xTemp = point->x * dCosA - point->y * dSinA;
+            point->y = point->x * dSinA + point->y * dCosA;
+            point->x = xTemp;
+
+            // back transform coordinates, if necessary
+            if( center.x ) point->x += center.x;
+            if( center.y ) point->y += center.y;
+        }
+    }
+}
+
+void wxDCBase::CalculateEllipticPoints( wxList* points,
+                                        wxCoord xStart, wxCoord yStart,
+                                        wxCoord w, wxCoord h,
+                                        double sa, double ea )
+{
+    double pi = M_PI;
+    double sar = 0;
+    double ear = 0;
+    int xsa = 0;
+    int ysa = 0;
+    int xea = 0;
+    int yea = 0;
+    int sq = 0;
+    int eq = 0;
+    bool bUseAngles = false;
+    if( w<0 ) w = -w;
+    if( h<0 ) h = -h;
+    // half-axes
+    wxCoord a = w/2;
+    wxCoord b = h/2;
+    // decrement 1 pixel if ellipse is smaller than 2*a, 2*b
+    int decrX = 0;
+    if( 2*a == w ) decrX = 1;
+    int decrY = 0;
+    if( 2*b == h ) decrY = 1;
+    // center
+    wxCoord xCenter = xStart + a;
+    wxCoord yCenter = yStart + b;
+    // calculate data for start and end, if necessary
+    if( sa != ea )
+    {
+        bUseAngles = true;
+        // normalisation of angles
+        while( sa<0 ) sa += 360;
+        while( ea<0 ) ea += 360;
+        while( sa>=360 ) sa -= 360;
+        while( ea>=360 ) ea -= 360;
+        // calculate quadrant numbers
+        if( sa > 270 ) sq = 3;
+        else if( sa > 180 ) sq = 2;
+        else if( sa > 90 ) sq = 1;
+        if( ea > 270 ) eq = 3;
+        else if( ea > 180 ) eq = 2;
+        else if( ea > 90 ) eq = 1;
+        sar = sa * pi / 180.0;
+        ear = ea * pi / 180.0;
+        // correct angle circle -> ellipse
+        sar = atan( -a/(double)b * tan( sar ) );
+        if ( sq == 1 || sq == 2 ) sar += pi;
+        ear = atan( -a/(double)b * tan( ear ) );
+        if ( eq == 1 || eq == 2 ) ear += pi;
+        // coordinates of points
+        xsa = xCenter + a * cos( sar );
+        if( sq == 0 || sq == 3 ) xsa -= decrX;
+        ysa = yCenter + b * sin( sar );
+        if( sq == 2 || sq == 3 ) ysa -= decrY;
+        xea = xCenter + a * cos( ear );
+        if( eq == 0 || eq == 3 ) xea -= decrX;
+        yea = yCenter + b * sin( ear );
+        if( eq == 2 || eq == 3 ) yea -= decrY;
+    } // if iUseAngles
+    // calculate c1 = b^2, c2 = b^2/a^2 with a = w/2, b = h/2
+    double c1 = b * b;
+    double c2 = 2.0 / w;
+    c2 *= c2;
+    c2 *= c1;
+    wxCoord x = 0;
+    wxCoord y = b;
+    long x2 = 1;
+    long y2 = y*y;
+    long y2_old = 0;
+    long y_old = 0;
+    // Lists for quadrant 1 to 4
+    wxList pointsarray[4];
+    // Calculate points for first quadrant and set in all quadrants
+    for( x = 0; x <= a; ++x )
+    {
+        x2 = x2+x+x-1;
+        y2_old = y2;
+        y_old = y;
+        bool bNewPoint = false;
+        while( y2 > c1 - c2 * x2 && y > 0 )
+        {
+            bNewPoint = true;
+            y2 = y2-y-y+1;
+            --y;
+        }
+        // old y now to big: set point with old y, old x
+        if( bNewPoint && x>1)
+        {
+            int x1 = x - 1;
+            // remove points on the same line
+            pointsarray[0].Insert( (wxObject*) new wxPoint( xCenter + x1 - decrX, yCenter - y_old ) );
+            pointsarray[1].Append( (wxObject*) new wxPoint( xCenter - x1, yCenter - y_old ) );
+            pointsarray[2].Insert( (wxObject*) new wxPoint( xCenter - x1, yCenter + y_old - decrY ) );
+            pointsarray[3].Append( (wxObject*) new wxPoint( xCenter + x1 - decrX, yCenter + y_old - decrY ) );
+        } // set point
+    } // calculate point
+
+    // Starting and/or ending points for the quadrants, first quadrant gets both.
+    pointsarray[0].Insert( (wxObject*) new wxPoint( xCenter + a - decrX, yCenter ) );
+    pointsarray[0].Append( (wxObject*) new wxPoint( xCenter, yCenter - b ) );
+    pointsarray[1].Append( (wxObject*) new wxPoint( xCenter - a, yCenter ) );
+    pointsarray[2].Append( (wxObject*) new wxPoint( xCenter, yCenter + b - decrY ) );
+    pointsarray[3].Append( (wxObject*) new wxPoint( xCenter + a - decrX, yCenter ) );
+
+    // copy quadrants in original list
+    if( bUseAngles )
+    {
+        // Copy the right part of the points in the lists
+        // and delete the wxPoints, because they do not leave this method.
+        points->Append( (wxObject*) new wxPoint( xsa, ysa ) );
+        int q = sq;
+        bool bStarted = false;
+        bool bReady = false;
+        bool bForceTurn = ( sq == eq && sa > ea );
+        while( !bReady )
+        {
+            for( wxNode *node = pointsarray[q].GetFirst(); node; node = node->GetNext() )
+            {
+                // once: go to starting point in start quadrant
+                if( !bStarted &&
+                    (
+                      ( (wxPoint*) node->GetData() )->x < xsa+1 && q <= 1
+                      ||
+                      ( (wxPoint*) node->GetData() )->x > xsa-1 && q >= 2
+                    )
+                  )
+                {
+                    bStarted = true;
+                }
+
+                // copy point, if not at ending point
+                if( bStarted )
+                {
+                    if( q != eq || bForceTurn
+                        ||
+                        ( (wxPoint*) node->GetData() )->x > xea+1 && q <= 1
+                        ||
+                        ( (wxPoint*) node->GetData() )->x < xea-1 && q >= 2
+                      )
+                    {
+                        // copy point
+                        wxPoint* pPoint = new wxPoint( *((wxPoint*) node->GetData() ) );
+                        points->Append( (wxObject*) pPoint );
+                    }
+                    else if( q == eq && !bForceTurn || ( (wxPoint*) node->GetData() )->x == xea)
+                    {
+                        bReady = true;
+                    }
+                }
+            } // for node
+            ++q;
+            if( q > 3 ) q = 0;
+            bForceTurn = false;
+            bStarted = true;
+        } // while not bReady
+        points->Append( (wxObject*) new wxPoint( xea, yea ) );
+
+        // delete points
+        for( q = 0; q < 4; ++q )
+        {
+            for( wxNode *node = pointsarray[q].GetFirst(); node; node = node->GetNext() )
+            {
+                wxPoint *p = (wxPoint *)node->GetData();
+                delete p;
+            }
+        }
+    }
+    else
+    {
+        wxNode* node;
+        // copy whole ellipse, wxPoints will be deleted outside
+        for( node = pointsarray[0].GetFirst(); node; node = node->GetNext() )
+        {
+            wxObject *p = node->GetData();
+            points->Append( p );
+        }
+        for( node = pointsarray[1].GetFirst(); node; node = node->GetNext() )
+        {
+            wxObject *p = node->GetData();
+            points->Append( p );
+        }
+        for( node = pointsarray[2].GetFirst(); node; node = node->GetNext() )
+        {
+            wxObject *p = node->GetData();
+            points->Append( p );
+        }
+        for( node = pointsarray[3].GetFirst(); node; node = node->GetNext() )
+        {
+            wxObject *p = node->GetData();
+            points->Append( p );
+        }
+    } // not iUseAngles
+} // CalculateEllipticPoints
+
+#endif
+
+//
+// temporary home for wxOverlay
+//
+
+#include "wx/dcclient.h"
+#include "wx/dcmemory.h"
+
+#if defined(wxMAC_USE_CORE_GRAPHICS) && wxMAC_USE_CORE_GRAPHICS
+
+#include "wx/mac/private.h"
+#include "wx/toplevel.h"
+
+class wxOverlayImpl
+{
+public:
+    wxOverlayImpl() ;
+    ~wxOverlayImpl() ;
+    
+    
+    // clears the overlay without restoring the former state
+    // to be done eg when the window content has been changed and repainted
+    void Reset();
+    
+    // returns true if it has been setup
+    bool IsOk();
+    
+    void Init( wxWindowDC* dc, int x , int y , int width , int height );
+    
+    void BeginDrawing( wxWindowDC* dc);
+    
+    void EndDrawing( wxWindowDC* dc);
+    
+    void Clear( wxWindowDC* dc);
+
+private:
+    OSStatus CreateOverlayWindow();
+    
+    void MacGetBounds( Rect *bounds );
+    
+    WindowRef m_overlayWindow;
+    WindowRef m_overlayParentWindow;
+    CGContextRef m_overlayContext ;
+    // we store the window in case we would have to issue a Refresh()
+    wxWindow* m_window ;
+    
+    int m_x ;
+    int m_y ;
+    int m_width ;
+    int m_height ;
+} ;
+
+wxOverlayImpl::wxOverlayImpl()
+{
+    m_window = NULL ;
+    m_overlayContext = NULL ;
+    m_overlayWindow = NULL ;
+}
+
+wxOverlayImpl::~wxOverlayImpl()
+{
+    Reset();
+}
+
+bool wxOverlayImpl::IsOk() 
+{
+    return m_overlayWindow != NULL ;
+}
+
+void wxOverlayImpl::MacGetBounds( Rect *bounds )
+{
+    wxPoint origin(0,0);
+    origin = m_window->ClientToScreen( origin );
+    bounds->top = origin.y;
+    bounds->left = origin.x;
+    bounds->bottom = origin.y+m_y+m_height;
+    bounds->right = origin.x+m_x+m_width;
+}
+
+OSStatus wxOverlayImpl::CreateOverlayWindow()
+{
+    OSStatus err;
+
+    WindowAttributes overlayAttributes  = kWindowIgnoreClicksAttribute;
+        
+    m_overlayParentWindow =(WindowRef) m_window->MacGetTopLevelWindowRef();
+    
+    Rect bounds ;
+    MacGetBounds(&bounds);
+    err  = CreateNewWindow( kOverlayWindowClass, overlayAttributes, &bounds, &m_overlayWindow );  
+    if ( err == noErr ) 
+    {
+        SetWindowGroup( m_overlayWindow, GetWindowGroup(m_overlayParentWindow));    //  Put them in the same group so that their window layers are consistent
+        ShowWindow(m_overlayWindow);
+    }
+    return err;
+}
+
+void wxOverlayImpl::Init( wxWindowDC* dc, int x , int y , int width , int height )
+{
+    wxASSERT_MSG( !IsOk() , _("You cannot Init an overlay twice") );
+
+    m_window = dc->GetWindow(); 
+    m_x = x ;
+    m_y = y ;
+    m_width = width ;
+    m_height = height ;
+    
+    OSStatus err = CreateOverlayWindow();
+    wxASSERT_MSG(  err == noErr , _("Couldn't create the overlay window") );
+#ifndef __LP64__
+    err = QDBeginCGContext(GetWindowPort(m_overlayWindow), &m_overlayContext);
+#endif
+    CGContextTranslateCTM( m_overlayContext, 0, m_height+m_y );
+    CGContextScaleCTM( m_overlayContext, 1, -1 );
+    wxASSERT_MSG(  err == noErr , _("Couldn't init the context on the overlay window") );
+}
+
+void wxOverlayImpl::BeginDrawing( wxWindowDC* dc)
+{
+    delete dc->m_graphicContext ;
+    dc->m_graphicContext = new wxMacCGContext( m_overlayContext );
+    // we are right now startin at 0,0 not at the wxWindow's origin, so most of the calculations 
+    // int dc are already corect
+    // just to make sure :
+    dc->m_macLocalOrigin.x = 0 ;
+    dc->m_macLocalOrigin.y = 0 ;
+    wxSize size = m_window->GetSize() ;
+    dc->SetClippingRegion( 0 , 0 , size.x , size.y ) ;
+}
+
+void wxOverlayImpl::EndDrawing( wxWindowDC* dc)
+{
+    delete dc->m_graphicContext ;
+    dc->m_graphicContext = NULL ;
+
+}
+
+void wxOverlayImpl::Clear(wxWindowDC* dc) 
+{
+    wxASSERT_MSG( IsOk() , _("You cannot Clear an overlay that is not inited") );
+    CGRect box  = CGRectMake( m_x - 1, m_y - 1 , m_width + 2 , m_height + 2 );
+    CGContextClearRect( m_overlayContext, box );
+}
+
+void wxOverlayImpl::Reset()
+{
+    if ( m_overlayContext )
+    {
+#ifndef __LP64__
+        OSStatus err = QDEndCGContext(GetWindowPort(m_overlayWindow), &m_overlayContext);
+        wxASSERT_MSG(  err == noErr , _("Couldn't end the context on the overlay window") );
+#endif
+        m_overlayContext = NULL ;
+    }    
+    
+    // todo : don't dispose, only hide and reposition on next run
+    if (m_overlayWindow)
+    {
+        DisposeWindow(m_overlayWindow);
+        m_overlayWindow = NULL ;
+    }
+}
+
+//
+//
+//
+
+#else // ie not wxMAC_USE_CORE_GRAPHICS
+
+class wxOverlayImpl
+{
+public:
+    wxOverlayImpl() ;
+    ~wxOverlayImpl() ;
+    
+    
+    // clears the overlay without restoring the former state
+    // to be done eg when the window content has been changed and repainted
+    void Reset();
+    
+    // returns true if it has been setup
+    bool IsOk();
+    
+    void Init( wxWindowDC* dc, int x , int y , int width , int height );
+    
+    void BeginDrawing( wxWindowDC* dc);
+    
+    void EndDrawing( wxWindowDC* dc);
+    
+    void Clear( wxWindowDC* dc);
+
+private:
+    wxBitmap m_bmpSaved ;
+    int m_x ;
+    int m_y ;
+    int m_width ;
+    int m_height ;
+// this is to enable wxMOTIF and UNIV to compile....
+// currently (10 oct 06) we don't use m_window
+// ce - how do we fix this
+#if defined(__WXGTK__) || defined(__WXMSW__)
+//    
+    wxWindow* m_window ;
+#endif   
+} ;
+
+wxOverlayImpl::wxOverlayImpl()
+{
+#if defined(__WXGTK__) || defined(__WXMSW__)
+     m_window = NULL ;
+#endif   
+     m_x = m_y = m_width = m_height = 0 ;
+}
+
+wxOverlayImpl::~wxOverlayImpl()
+{
+}
+
+bool wxOverlayImpl::IsOk() 
+{
+    return m_bmpSaved.Ok() ;
+}
+
+void wxOverlayImpl::Init( wxWindowDC* dc, int x , int y , int width , int height )
+{
+#if defined(__WXGTK__)
+    m_window = dc->m_owner;
+#else
+    #if defined (__WXMSW__) 
+    m_window = dc->GetWindow();
+    #endif  // __WXMSW__
+   
+#endif
+    wxMemoryDC dcMem ;
+    m_bmpSaved.Create( width, height );
+    dcMem.SelectObject( m_bmpSaved );
+    m_x = x ;
+    m_y = y ;
+    m_width = width ;
+    m_height = height ;
+#if defined(__WXGTK__) && !defined(__WX_DC_BLIT_FIXED__)
+    wxPoint pt = dc->GetDeviceOrigin();
+    x += pt.x;
+    y += pt.y;
+#endif // broken wxGTK wxDC::Blit
+    dcMem.Blit(0, 0, m_width, m_height,
+        dc, x, y);
+    dcMem.SelectObject( wxNullBitmap );
+}
+
+void wxOverlayImpl::Clear(wxWindowDC* dc) 
+{
+    wxMemoryDC dcMem ;
+    dcMem.SelectObject( m_bmpSaved );
+    dc->Blit( m_x, m_y, m_width, m_height , &dcMem , 0 , 0 );
+    dcMem.SelectObject( wxNullBitmap );
+}
+
+void wxOverlayImpl::Reset()
+{
+    m_bmpSaved = wxBitmap();
+}
+
+void wxOverlayImpl::BeginDrawing(wxWindowDC*  WXUNUSED(dc))
+{
+}
+
+void wxOverlayImpl::EndDrawing(wxWindowDC* WXUNUSED(dc))
+{
+}
+
+#endif
+
+// common code
+
+wxOverlay::wxOverlay()
+{
+    m_impl = new wxOverlayImpl();
+    m_inDrawing = false;
+}
+
+wxOverlay::~wxOverlay()
+{
+    wxDELETE( m_impl );
+}
+
+bool wxOverlay::IsOk()
+{
+    return m_impl->IsOk();
+}
+
+void wxOverlay::Init( wxWindowDC* dc, int x , int y , int width , int height )
+{
+    m_impl->Init(dc, x, y, width, height);
+}
+
+void wxOverlay::BeginDrawing( wxWindowDC* dc)
+{
+    m_impl->BeginDrawing(dc);
+    m_inDrawing = true ;
+}
+
+void wxOverlay::EndDrawing( wxWindowDC* dc)
+{
+    m_impl->EndDrawing(dc);
+    m_inDrawing = false ;
+}
+
+void wxOverlay::Clear( wxWindowDC* dc)
+{
+    m_impl->Clear(dc);
+}
+
+void wxOverlay::Reset()
+{
+    wxASSERT_MSG(m_inDrawing==false,wxT("cannot reset overlay during drawing"));
+    m_impl->Reset();
+}
+
+// dc connector
+
+wxDCOverlay::wxDCOverlay(wxOverlay &overlay, wxWindowDC *dc, int x , int y , int width , int height) :
+    m_overlay(overlay)
+{
+    Init(dc, x, y, width, height);
+}
+
+wxDCOverlay::wxDCOverlay(wxOverlay &overlay, wxWindowDC *dc) :
+    m_overlay(overlay)
+{
+    int width;
+    int height;
+    dc->GetSize(&width,&height);
+    Init(dc, 0, 0, width, height);
+}
+
+wxDCOverlay::~wxDCOverlay()
+{
+    m_overlay.EndDrawing(m_dc);
+}
+
+void wxDCOverlay::Init(wxWindowDC *dc, int x , int y , int width , int height )
+{
+    m_dc = dc ;
+    if ( !m_overlay.IsOk() )
+    {
+        m_overlay.Init(dc,x,y,width,height);
+    }
+    m_overlay.BeginDrawing(dc);
+}
+
+void wxDCOverlay::Clear() 
+{
+    m_overlay.Clear(m_dc);
+}