Color a TDBGrid

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// Function to color a DBGrid (declared as private)

procedure TForm1.ColorGrid(dbgIn: TDBGrid; qryIn: TQuery; const Rect: TRect;
  DataCol: Integer; Column: TColumn;
  State: TGridDrawState);
var
  iValue: LongInt;
begin
  // color only the first field
  if (DataCol = 0) then
  begin
    // Check the field value and assign a color
    iValue := qryIn.FieldByName('HINWEIS_COLOR').AsInteger;
    case iValue of
      1: dbgIn.Canvas.Brush.Color := clGreen;
      2: dbgIn.Canvas.Brush.Color := clLime;
      3: dbgIn.Canvas.Brush.Color := clYellow;
      4: dbgIn.Canvas.Brush.Color := clRed;
    end;
    // Draw the field
    dbgIn.DefaultDrawColumnCell(Rect, DataCol, Column, State);
  end;
end;

procedure TForm1.DBGrid1DrawColumnCell(Sender: TObject;
  const Rect: TRect; DataCol: Integer; Column: TColumn; State: TGridDrawState);
begin
  ColorGrid(DBGrid1, Query1, Rect, DataCol, Column, State);
end;