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再学GDI+[8]: DrawRectangles - 绘制一组矩形

2012-05-05 20:43 [Delphi教程] 来源于:
导读:本例效果图: 代码文件: unit Unit1; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs; type TForm1 = cl

本例效果图:

代码文件: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 p Length(RectArr);
 hi := Rect.Height p 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.

窗体文件: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

(编辑:)

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