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  • WinAPI: OffsetRect 移动矩形

    本例效果图:


    unit Unit1;
    
    interface
    
    uses
      Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
      Dialogs, StdCtrls;
    
    type
      TForm1 = class(TForm)
        Button1: TButton;
        Button2: TButton;
        Button3: TButton;
        Button4: TButton;
        Button5: TButton;
        procedure Draw;
        procedure FormCreate(Sender: TObject);
        procedure Button1Click(Sender: TObject);
        procedure Button2Click(Sender: TObject);
        procedure Button3Click(Sender: TObject);
        procedure Button4Click(Sender: TObject);
        procedure Button5Click(Sender: TObject);
      end;
    
    var
      Form1: TForm1;
    
    implementation
    
    {$R *.dfm}
    
    var
      R: TRect;
    
    procedure TForm1.Draw;
    begin
      Refresh;
      Canvas.FillRect(R);
    end;
    
    procedure TForm1.FormCreate(Sender: TObject);
    begin
      Button1.Caption := '绘制矩形';
      Button2.Caption := '上移';
      Button3.Caption := '下移';
      Button4.Caption := '左移';
      Button5.Caption := '右移';
    end;
    
    procedure TForm1.Button1Click(Sender: TObject);
    begin
      R := Bounds(80, 60, 60, 60);
      Randomize;
      Canvas.Brush.Color := Random($FFFFFF);
      Draw;
    end;
    
    procedure TForm1.Button2Click(Sender: TObject);
    begin
      OffsetRect(R, 0, -10);
      Draw;
    end;
    
    procedure TForm1.Button3Click(Sender: TObject);
    begin
      OffsetRect(R, 0, 10);
      Draw;
    end;
    
    procedure TForm1.Button4Click(Sender: TObject);
    begin
      OffsetRect(R, -10, 0);
      Draw;
    end;
    
    procedure TForm1.Button5Click(Sender: TObject);
    begin
      OffsetRect(R, 10, 0);
      Draw;
    end;
    
    end.
    
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  • 原文地址:https://www.cnblogs.com/del/p/1205269.html
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