再學 GDI+[3]: DrawRectangle - 繪制矩形

　本例效果圖:

unit Unit1;
interface
uses
　Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
　Dialogs;
type
　TForm1 = class(TForm)
　　procedure FormPaint(Sender: TObject);
　end;
var
　Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
procedure TForm1.FormPaint(Sender: TObject);
const
　w = 100;
　h = 50;
var
　g: TGPGraphics;
　p: TGPPen;
　x,y: Single;
begin
　g := TGPGraphics.Create(Canvas.Handle);
　p := TGPPen.Create(0, 2);
　g.Clear(MakeColor(255,255,255));
　x := 20;
　y := 20;
　p.SetColor(aclRed);
　g.DrawRectangle(p, x, y, w, h);
　p.SetColor(aclGold);
　x := x + w / 2;
　y := y + h /2;
　g.DrawRectangle(p, MakeRect(x, y, w, h));
　g.Free;
　p.Free;
end;
end.