Misc. Types (Enumerations) for Grayscale Routines
enum GrayColors {COLOR_WHITE=0,COLOR_LIGHTGRAY=1,COLOR_DARKGRAY=2,COLOR_BLACK=3};
Enumeration GrayColors specifies grayscale color values used within the ExtGraph library.
enum FillAttrs {RECT_EMPTY=0,RECT_FILLED};
Enumeration FillAttrs specifies filling types for function DrawGrayRect.
enum ExtAttrs {A_CENTERED=0x40,A_SHADOWED=0x80};
Enumeration FillAttrs specifies extended text drawing attributes used by
function DrawGrayStrExt.