核心提示：unit Unit1;interfaceuses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,...
unit Unit1;interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, ExtCtrls;
type
TForm1 = class(TForm)
Panel1: TPanel;
Panel2: TPanel;
PaintBox1: TPaintBox;
PaintBox2: TPaintBox;
Button1: TButton;
procedure PaintBox1Paint(Sender: TObject);
procedure PaintBox2Paint(Sender: TObject);
procedure Button1Click(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.PaintBox1Paint(Sender: TObject);
begin
PaintBox1.Canvas.Brush.Color := clWhite;
PaintBox1.Canvas.FillRect(PaintBox1.BoundsRect);
PaintBox1.Canvas.MoveTo(0, 0);
PaintBox1.Canvas.LineTo(PaintBox1.Width, PaintBox1.Height);
PaintBox1.Canvas.MoveTo(PaintBox1.Width, 0);
PaintBox1.Canvas.LineTo(0, PaintBox1.Height);
end;
procedure TForm1.PaintBox2Paint(Sender: TObject);
begin
PaintBox2.Canvas.Brush.Color := clGreen;
PaintBox2.Canvas.Ellipse(0, 0, PaintBox2.Width, PaintBox2.Height);
end;
procedure TForm1.Button1Click(Sender: TObject);
var
R1,R2: TRect;
begin
R2 := PaintBox2.BoundsRect;
{Windows.CopyRect}
CopyRect(R1, R2); //相当于: R1 := R2;
OffsetRect(R1, 10, 10);
{TCanvas.CopyRect}
PaintBox1.Canvas.CopyRect(R1, PaintBox2.Canvas, R2);
end;
end.
