IS_HATCH macro replaced with wxBrush::IsHatch() + source and docs little cleaning.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@30819 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/mgl/brush.h

@@ -49,11 +49,14 @@ public:
     wxColour &GetColour() const;
     wxBitmap *GetStipple() const;
 
+    bool IsHatch() const
+        { return (GetStyle()>=wxBDIAGONAL_HATCH) && (GetStyle()<=wxVERTICAL_HATCH); }
+
     void SetColour(const wxColour& col);
     void SetColour(unsigned char r, unsigned char g, unsigned char b);
     void SetStyle(int style);
     void SetStipple(const wxBitmap& stipple);
-    
+
     // implementation:
 
     void* GetMaskPattern() const;