adding comment

[wxWidgets.git] / include / wx / dc.h

diff --git a/include/wx/dc.h b/include/wx/dc.h
index 9c6748a920ac15e1af242f1027c403b3aa9a99cf..a957b28e780f556957126f9b08e1fafcb8c8aa4e 100644 (file)
--- a/include/wx/dc.h
+++ b/include/wx/dc.h
@@ -283,7 +283,7 @@ public:
         return NULL;
     }
 
-    virtual void* GetHandle() const = 0;
+    virtual void* GetHandle() const { return NULL; }
     
     // query dimension, colour deps, resolution
 
@@ -433,8 +433,12 @@ public:
 
     // clipping
 
+    // Note that this pure virtual method has an implementation that updates
+    // the values returned by DoGetClippingBox() and so can be called from the
+    // derived class overridden version if it makes sense (i.e. if the clipping
+    // box coordinates are not already updated in some other way).
     virtual void DoSetClippingRegion(wxCoord x, wxCoord y,
-                                     wxCoord width, wxCoord height) = 0;
+                                     wxCoord w, wxCoord h) = 0;
 
     // NB: this function works with device coordinates, not the logical ones!
     virtual void DoSetDeviceClippingRegion(const wxRegion& region) = 0;
@@ -600,15 +604,15 @@ public:
         { return wxNullBitmap; }
 
 
-    virtual void DoDrawLines(int n, wxPoint points[],
+    virtual void DoDrawLines(int n, const wxPoint points[],
                              wxCoord xoffset, wxCoord yoffset ) = 0;
     virtual void DrawLines(const wxPointList *list,
                            wxCoord xoffset, wxCoord yoffset );
 
-    virtual void DoDrawPolygon(int n, wxPoint points[],
+    virtual void DoDrawPolygon(int n, const wxPoint points[],
                            wxCoord xoffset, wxCoord yoffset,
                            wxPolygonFillMode fillStyle = wxODDEVEN_RULE) = 0;
-    virtual void DoDrawPolyPolygon(int n, int count[], wxPoint points[],
+    virtual void DoDrawPolyPolygon(int n, const int count[], const wxPoint points[],
                                wxCoord xoffset, wxCoord yoffset,
                                wxPolygonFillMode fillStyle);
     void DrawPolygon(const wxPointList *list,
@@ -620,7 +624,7 @@ public:
     void DrawSpline(wxCoord x1, wxCoord y1,
                             wxCoord x2, wxCoord y2,
                             wxCoord x3, wxCoord y3);
-    void DrawSpline(int n, wxPoint points[]);
+    void DrawSpline(int n, const wxPoint points[]);
     void DrawSpline(const wxPointList *points) { DoDrawSpline(points); }
 
     virtual void DoDrawSpline(const wxPointList *points);
@@ -1135,7 +1139,7 @@ public:
     void DrawPoint(const wxPoint& pt)
         { m_pimpl->DoDrawPoint(pt.x, pt.y); }
 
-    void DrawLines(int n, wxPoint points[],
+    void DrawLines(int n, const wxPoint points[],
                    wxCoord xoffset = 0, wxCoord yoffset = 0)
         { m_pimpl->DoDrawLines(n, points, xoffset, yoffset); }
     void DrawLines(const wxPointList *list,
@@ -1146,7 +1150,7 @@ public:
                                  wxCoord xoffset = 0, wxCoord yoffset = 0) );
 #endif  // WXWIN_COMPATIBILITY_2_8
 
-    void DrawPolygon(int n, wxPoint points[],
+    void DrawPolygon(int n, const wxPoint points[],
                      wxCoord xoffset = 0, wxCoord yoffset = 0,
                      wxPolygonFillMode fillStyle = wxODDEVEN_RULE)
         { m_pimpl->DoDrawPolygon(n, points, xoffset, yoffset, fillStyle); }
@@ -1154,7 +1158,7 @@ public:
                      wxCoord xoffset = 0, wxCoord yoffset = 0,
                      wxPolygonFillMode fillStyle = wxODDEVEN_RULE)
         { m_pimpl->DrawPolygon( list, xoffset, yoffset, fillStyle ); }
-    void DrawPolyPolygon(int n, int count[], wxPoint points[],
+    void DrawPolyPolygon(int n, const int count[], const wxPoint points[],
                          wxCoord xoffset = 0, wxCoord yoffset = 0,
                          wxPolygonFillMode fillStyle = wxODDEVEN_RULE)
         { m_pimpl->DoDrawPolyPolygon(n, count, points, xoffset, yoffset, fillStyle); }
@@ -1277,7 +1281,7 @@ public:
                     wxCoord x2, wxCoord y2,
                     wxCoord x3, wxCoord y3)
         { m_pimpl->DrawSpline(x1,y1,x2,y2,x3,y3); }
-    void DrawSpline(int n, wxPoint points[])
+    void DrawSpline(int n, const wxPoint points[])
         { m_pimpl->DrawSpline(n,points); }
     void DrawSpline(const wxPointList *points)
         { m_pimpl->DrawSpline(points); }