Question

delphi中canvas在哪

Answer 1

每一个窗体中菜单之下的整个窗体都是canvas（画布）。

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
     canvas.LineTo(0,100);
     canvas.LineTo(100,100);
     canvas.LineTo(100,0);
end;

end.