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procedure IdleLoop(Sender: TObject; var Done: boolean);
begin
  Done := false;
  //...hier weiterer Code zur Berechnung und Grafikausgabe
  Application.ProcessMessages;   
end;					

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procedure TForm.Create(Sender: TObject);
begin
  Application.OnIdle := IdleLoop;
end;					

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unit uMain;

interface

uses
  SysUtils, Types, Classes, Variants, QTypes, QGraphics, QControls, QForms,
  QDialogs, QStdCtrls;

type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
    procedure IdleLoop(Sender: TObject; var Done: boolean);
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.xfm}

procedure TForm1.IdleLoop(Sender: TObject; var Done: boolean);
begin
  Done := false;
  Canvas.MoveTo(random(Width), random(Height));
  Canvas.LineTo(random(Width), random(Height));
  Application.ProcessMessages;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Application.OnIdle := IdleLoop;
end;

end.