本文以实例演示Rect、Bounds生成TRect的区别，实例代码如下：

unitUnit1;interfaceusesWindows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,Dialogs, StdCtrls, ExtCtrls;typeTForm1 = class(TForm)Button1: TButton;RadioGroup1: TRadioGroup;procedure RadioGroup1Click(Sender: TObject);procedure FormCreate(Sender: TObject);end;varForm1: TForm1;implementation{$R *.dfm}varR: TRect;procedure TForm1.FormCreate(Sender: TObject);beginRadioGroup1.Items.CommaText := 'Undo,Rect,Bounds';R := Button1.BoundsRect;end;procedure TForm1.RadioGroup1Click(Sender: TObject);begincase RadioGroup1.ItemIndex of0: Button1.BoundsRect := R;1: Button1.BoundsRect := Rect(50,50,100,80); {参数3、4 是一个点}2: Button1.BoundsRect := Bounds(50,50,100,80);{参数3、4 分别是宽度与高度}end;end;end.

最终实现效果图如下：