StringGrid1裡怎麼任意改變謀一柵格的字體大小、顏色(50分)

StringGrid1裡怎麼任意改變謀一柵格的字體大小、顏色

procedure TForm1.StringGrid1DrawCell(Sender: TObject; ACol, ARow: Integer;
Rect: TRect; State: TGridDrawState);
begin
with StringGrid1 do
begin
if (ACol = 3) and (ARow = 3) then
begin
Canvas.Brush.Color := clRed;
Canvas.FillRect(Rect);
Canvas.Font.Name := 'Courier New';
Canvas.TextOut(Rect.Left + 2, Rect.Top + 2, Cells[ACol, ARow]);
end;
end;
end;

怎么改变背景颜色呢？

柵格內的字體居中呢?

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