再學 GDI+[8]: DrawRectangles - 繪制一組矩形

本例效果圖:

　　代碼文件:unit Unit1;
interface
uses
　Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
　Dialogs;
type
　TForm1 = class(TForm)
　　procedure FormPaint(Sender: TObject);
　　procedure FormResize(Sender: TObject);
　end;
var
　Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
var
　RectArr: array[0..31] of TGPRect;
procedure TForm1.FormResize(Sender: TObject);
var
　wi,hi: Integer;
　i: Integer;
　Rect: TGPRect;
begin
　Rect.X := 0;
　Rect.Y := 0;
　Rect.Width := ClIEntWidth;
　Rect.Height := ClIEntHeight;
　wi := Rect.Width div Length(RectArr);
　hi := Rect.Height div Length(RectArr);
　for i := 0 to Length(RectArr) - 1 do
　begin
　　Inc(Rect.X, wi);
　　Inc(Rect.Y, hi);
　　Dec(Rect.Width, wi * 2);
　　Dec(Rect.Height, hi * 2);
　　RectArr[i] := Rect;
　end;
　Repaint;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
　g: TGPGraphics;
　p: TGPPen;
begin
　g := TGPGraphics.Create(Canvas.Handle);
　p := TGPPen.Create(aclRed, 1);
　g.Clear(aclWhite);
　g.DrawRectangles(p, PGPRect(@RectArr), Length(RectArr));
　g.Free;
　p.Free;
end;
end.窗體文件:object Form1: TForm1
　Left = 0
　Top = 0
　Caption = 'Form1'
　ClIEntHeight = 188
　ClIEntWidth = 264
　Color = clBtnFace
　Font.Charset = DEFAULT_CHARSET
　Font.Color = clWindowText
　Font.Height = -11
　Font.Name = 'Tahoma'
　Font.Style = []
　OldCreateOrder = False
　Position = poDesktopCenter
　OnPaint = FormPaint
　OnResize = FormResize
　PixelsPerInch = 96
　TextHeight = 13
end