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Canvas.TextOut...					

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procedure TMyScreenSaverForm.DoFrame;
const TitelFontSize=24; ResolutionX=1024;
var c1: TCanvas; iInc: Integer; 
begin
 iInc:=1;
 repeat
  s1:=UpperCase(s1);
  c1:=TCanvas.Create;
  c1.Handle:=Canvas.Handle;
  with c1.Font do begin
   Style:=[fsBold];
   Color:=clGreen;
   Name:='Verdana';
   Size:=Ceil((TitelFontSize*(4/(iInc+3)))*(Self.Width/ResolutionX));
   if c1.TextWidth(s1)>Self.Width*(60/100) then Size:=Round((Size * 60 * Self.Width)/(100 * c1.TextWidth(s1)));
  end;

  iY:=(Height div 2)-((Abs(c1.Font.Height)) div 2);
  Inc(iInc);
 until iY>0;

 sDraw:=s1;
 iStep:=Length(sDraw);
 Canvas.Font:=c1.Font;
 ShowChar.Enabled:=true;
 while ShowChar.Enabled and bRunning do begin
  Application.ProcessMessages;
  sleep(1);
 end;

 c1.Free;
end;					

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procedure TMyScreenSaverForm.ShowCharTimer(Sender: TObject);
var iCenterX: Integer; sTmp: String;
begin
 Dec(iStep);
 sTmp:=Copy(sDraw,1,Length(sDraw)-iStep);
 iCenterX:=(Width div 2)-(Canvas.TextWidth(sTmp) div 2);
 Canvas.TextOut(iCenterX,iY,sTmp);
 if iStep<=0 then ShowChar.Enabled:=false;
end;					

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iStep:=Length(sDraw); // Fehler: Inkompatible Typen

sTmp:=Copy(sDraw,1,Length(sDraw)-iStep);// Fehler: Inkompatible Typen

Canvas.TextOut(iCenterX,iY,sTmp);// Inkompatible Typen: Integer und Singel

s1:=UpperCase(s1); //Undefinierter Bezeichner: s1
while Form1.Timer1.Enabled and bRunning do begin //Undefinierter Bezeichner: bRunning					

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public
    { Public-Deklarationen }
  end;

var Form1: TForm1;
     iStep: Integer; s1,sDraw: String; bRunning: Boolean;

implementation

{$R *.DFM}					

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unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Timer1: TTimer;
    procedure Timer1Timer(Sender: TObject);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
    
  end;
var
  Form1: TForm1;
  Canvas : TCanvas;
  iStep: Integer; s1,sDraw: String; bRunning: Boolean;
  iy: Single;

implementation

{$R *.dfm}

procedure TMyScreenSaverForm.DoFrame;
const TitelFontSize=24; ResolutionX=1024; 
var c1: TCanvas; iInc: Integer; 
begin 
iInc:=1; 
repeat 
  s1:=UpperCase(s1); 
  c1:=TCanvas.Create; 
  c1.Handle:=Canvas.Handle; 
  with c1.Font do begin 
   Style:=[fsBold]; 
   Color:=clGreen; 
   Name:='Verdana'; 
   Size:=Ceil((TitelFontSize*(4/(iInc+3)))*(Self.Width/ResolutionX)); 
   if c1.TextWidth(s1)>Self.Width*(60/100) then Size:=Round((Size * 60 * Self.Width)/(100 * c1.TextWidth(s1))); 
  end; 

  iY:=(Height div 2)-((Abs(c1.Font.Height)) div 2); 
  Inc(iInc); 
until iY>0; 

sDraw:=s1; 
iStep:=Length(sDraw); 
Canvas.Font:=c1.Font; 
ShowChar.Enabled:=true; 
while ShowChar.Enabled and bRunning do begin 
  Application.ProcessMessages; 
  sleep(1); 
end; 

c1.Free; 
end;

procedure TForm1.Timer1Timer(Sender: TObject);
  var iCenterX: Integer; sTmp: String;
begin
Dec(iStep);
sTmp:=Copy(sDraw,1,Length(sDraw)-iStep);
iCenterX:=(Width div 2)-(Canvas.TextWidth(sTmp) div 2);
Canvas.TextOut(iCenterX,iY,sTmp);
if iStep<=0 then Form1.Timer1.Enabled:=false;
end;

end.