Draw Harness, ViewerTest - provide vbackground command unifying vsetbg, vsetbgmode, vsetgradientbg, vsetgrbgmode, vsetcolorbg

+} // namespace
+
+
+//=======================================================================
+// function : ColorFromName
...
+  Quantity_ColorRGBA aColor;
+
+  if (!Quantity_Color::ColorFromName (theColorNameString, aColor.ChangeRGB ()))
+  {
+    return false;
+  }
+  theColor = aColor;
+
...
+
+  ColorInteger aHexColorInteger;
+
+  if (!ConvertStringToInteger (aHexColorString, aHexColorInteger, 16u))

+  Quantity_NameOfColor aColorName;
+
+  if (!ColorFromName (theColorNameString, aColorName))

+Standard_Boolean Quantity_Color::ColorFromName (const Standard_CString theColorNameString, Quantity_Color& theColor)
+{
...
+bool Quantity_Color::ColorFromHex (const Standard_CString theHexColorString, Quantity_Color& theColor)
+{

+  //! Defines all possible lengthes of strings representing color in hex format
+  struct HexColorLengthStruct

+  //! value, where color components represent digits: an alpha component is a low number and a red component is a high
+  //! number)
...
+  //! @tparam TheLessComparableType the type of the passed values (it must support the less comparability for its
+  //! values)

+  //! Checks if the charater is a hexadecimal digit (0 .. 9, a .. f, A .. F)

+  //! @return true if parsing was successfull, or false otherwise

+typedef NCollection_Vec3<Standard_ShortReal> Graphic3d_Vec3;
+
+typedef NCollection_Vec3<Standard_Real> Graphic3d_Vec3d;

-#else
-static Handle(Xw_Window)& VT_GetWindow(){
-  static Handle(Xw_Window) XWWin;
-  return XWWin;
-}
+#else
+static Handle(Xw_Window)& VT_GetWindow(){
+  static Handle(Xw_Window) XWWin;
+  return XWWin;
+}
+
+static void VProcessEvents(ClientData,int);
+#endif
+
...

-# 
-# vsetgradientbg: vsetgradientbg R1 G1 B1 R2 G2 B2 Type
-# R1\G1\B1 - First color [0..255]
-# R2\G2\B2 - Second color [0..255]
-# Type 0 to 8
-# 0 = NONE,
-# 1 = HORIZONTAL,
-# 2 = VERTICAL,
-# 3 = DIAGONAL1,
-# 4 = DIAGONAL2,
-# 5 = CORNER1,
-# 6 = CORNER2,
-# 7 = CORNER3,
-# 8 = CORNER4
+#
+# vbackground -gradient Color1 Color2 [-gradientMode FillMethod]
+#
+#   Color:      Red Green Blue  - where Red, Green, Blue must be integers within the range [0, 255]\n"
+#                                   or reals within the range [0.0, 1.0]\n"
+#               ColorName       - one of WHITE, BLACK, RED, GREEN, BLUE, etc.\n"
+#               #HHH, [#]HHHHHH - where H is a hexadecimal digit (0 .. 9, a .. f, or A .. F)\n"
+#
+#   FillMethod: one of NONE, HOR (horizontal), VER (vertical), DIAG1 (diagonal1), DIAG2 (diagonal2),
+#                 CORNER1, CORNER2, CORNER3, CORNER4

 set R2 0
 set G2 0
 set B2 255
-set Type 5
+set Type CORNER1

+template <typename Element_t>
+class NCollection_Vec3;
+
+typedef NCollection_Vec3<Standard_ShortReal> Graphic3d_Vec3;
+
+typedef NCollection_Vec3<Standard_Real> Graphic3d_Vec3d;

+class Quantity_Color;
+
+class Quantity_ColorRGBA;
+
+class gp_Vec;
+
+class gp_Pnt;
+

+//! The key of the unnamed command option
+const std::size_t THE_UNNAMED_COMMAND_OPTION_KEY = (std::numeric_limits<std::size_t>::max)();
+
+//! The key of the help command option
+const std::size_t THE_HELP_COMMAND_OPTION_KEY = 0;

+  theCommands.Add ("vsetbg",
+                   "load image as background.\n"
+                   "This command is obsolete. Use vbackground instead.\n"
+                   "\n"

+//! Old versions of Microsoft Visual Studio support explicit template instantiation declaration only as an extension
+//! or doesn't support using explicit template instantiation declaration and definition in one file.
+//! Full support of this C++ feature is available since MS VS2013.
+#if defined(_MSC_VER) && (_MSC_VER >= 1800)