Sets the fill pattern and color.
procedure SetFillStyle(Pattern: Word; Color: Word);
Sets the pattern and color for all filling done by FillPoly, Bar, Bar3D, and PieSlice. A variety of fill patterns are available. The default pattern is solid, and the default color is the maximum color in the palette. If invalid input is passed to SetFillStyle, GraphResult returns a value of grError, and the current fill settings will be unchanged.
If Pattern equals UserFill, the user-defined pattern (set by a call to SetFillPattern) becomes the active pattern.
Must be in graphics mode.