再学 GDI+[8]: DrawRectangles - 绘制一组矩形

本例效果图:

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代码文件:

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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.


 
   

窗体文件:

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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