Graph Unit 
                     Type, Record and Variable Definitions 

     This constant is used by GetPalette, GetDefaultPalette, SetAllPalette,
     and to define the PaletteType record:

                   Const
                      MaxColors = 15;


     This record is used by GetPalette, GetDefaultPalette and SetAllPalette:

                   Type
                      PaletteType = Record
                         Size   : Byte;
                         Colors : Array[1..MaxColors] of ShortInt;
                      End;


     This record is used by GetLineSettings:

                   Type
                      LineSettingsType = Record
                         LineStyle  : Word;
                         Pattern    : Word;
                         Thickness  : Word;
                      End;


     This record is used by GetTextSettings:

                   Type
                      TextSettingsType = Record
                         Font      : Word;
                         Direction : Word;
                         CharSize  : Word;
                         Horiz     : Word;
                         Vert      : Word;
                      End;


     This record is used by GetFillSettings:

                   Type
                      FillSettingsType = Record
                         Pattern  : Word;
                         Color    : Word;
                      End;


     This record is used by GetFillPattern and SetFillPattern:

                  Type
                     FillPatternType  = Array[1..8] of Byte;


     This type is defined for your convenience:

                  Type
                     PointType = Record
                        X, Y, Integer;
                     End;


     This record is used by GetViewSettings to report the status of the
     current view port:

                  Type
                     ViewPortType = Record
                       X1, Y1, X2, Y2  : Integer;
                       Clip            : Boolean;
                     End;


     This record is used by GetArcCoords and can be used to retrieve
     information about the last call to Arc or Ellipse.

                  Type
                     ArcCoordsType = Record
                        X, Y               : Integer;
                        Xstart, Ystart     : Integer;
                        Xend, Yend         : Integer;
                     End;


     These variables point to the Graph units heap management routines:

    Var
      GraphGetMemPtr    : Pointer { allows user to steal heap allocation }
      GraphFreeMemPtr   : Pointer { allows user to steal heap deallocation }