Reference IGradientStop

  IGradientStop = interface
  public
    function GetOffset: Float;
    procedure SetOffset(Value: Float);
    function GetColor: TColorF;
    procedure SetColor(const Value: TColorF);
    { Where the stop is along the gradient, from 0 to 1 }
    property Offset: Float read GetOffset write SetOffset;
    { The color at the stop }
    property Color: TColorF read GetColor write SetColor;
  end;