本例效果图:
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}
procedure TForm1.FormPaint(Sender: TObject);
const
n = 50;
var
Rgn: HRGN;
x1,y1,x2,y2: Integer;
begin
x1 := n;
y1 := n div 2;
x2 := ClientWidth - n;
y2 := ClientHeight - n;
{建立矩形区域}
Rgn := CreateRectRgn(x1, y1, x2, y2);
//Rgn := CreateRectRgnIndirect(Rect(x1, y1, x2, y2)); {目的同上一行, 只是参数要一个矩形结构}
{填充区域}
Canvas.Brush.Color := clSilver;
Canvas.Brush.Style := bsCross;
FillRgn(Canvas.Handle, Rgn, Canvas.Brush.Handle);
{绘制区域边界}
Canvas.Brush.Color := clRed;
Canvas.Brush.Style := bsSolid;
FrameRgn(Canvas.Handle, Rgn, Canvas.Brush.Handle, 2, 2);
DeleteObject(Rgn);
end;
end.