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procedure TFMain.PicMouseMove(Sender: TObject; Shift: TShiftState; X,
  Y: Integer);
var
   DrawX, DrawY, i: integer;
   tmp: string;
begin
     // Wenn Maus gedrückt, neue Tabelle zeichnen
     if Mausaktiv = True then
     begin
               // Hintergrund wieder löschen...erlaubt "ziehen" des Rechtecks
               Pic.Canvas.Brush.Color:= clWhite;
               Pic.Canvas.FillRect(Rect(MausX,MausY, OldX, OldY));


               // KLAPPT NICHT vvvvvvvvvvvvvvvvvvvvvvvvvvvvv !!!!!
               if checkmove(tLeft, tTop, tRight, tBottom) = True then
               begin
                    // Nicht über Bildschirm raus gehen!
                    if (X > Pic.Width) then
                    begin
                         DrawX:= Pic.Width;
                    end
                    else if (X < 0) then
                    begin
                         DrawX:= 0;
                    end
                    else
                    begin
                         DrawX:= X;
                    end;
                    if (Y > Pic.Height) then
                    begin
                         DrawY:= Pic.Height;
                    end
                    else if (Y < 0) then
                    begin
                         DrawY:= 0;
                    end
                    else
                    begin
                         DrawY:= Y;
                    end;
               end;

               // Koordinaten des TRects "ordnen"
               if MausX > DrawX then
               begin
                    tLeft:= DrawX;
                    tRight:= MausX;
               end
               else
               begin
                    tLeft:= MausX;
                    tRight:= DrawX;
               end;
               if MausY > DrawY then
               begin
                    tTop:= DrawY;
                    tBottom:= MausY;
               end
               else
               begin
                    tTop:= MausY;
                    tBottom:= DrawY;
               end;

               // Neues aktives Rechteck zeichen...
               Pic.Canvas.Brush.Color:= $00BAF8C8;
               Pic.Canvas.Rectangle(Rect(tLeft, tTop, tRight, tBottom));

               // Jetzige Werte speichern, nachher alt -> löschen
               Oldx:= DrawX;
               OldY:= DrawY;
     end;
end;



function TFMain.Checkmove(left2, top2, right2, bottom2 : integer): boolean;
var
   i: integer;
   tmp: string;
   left3, top3, right3, bottom3: integer;
   ok: boolean;
begin
     ok:= True;
          for i:= 0 to Tables.Count - 1 do
          begin
               // Werte splitten
               tmp:= Tables.Strings[i];
               left3:= StrToInt(Copy(tmp, 0, Pos('.', tmp) - 1));

               tmp:= Copy(tmp, Pos('.', tmp) + 1, Length(tmp));
               top3:= StrToInt(Copy(tmp, 0, Pos('.', tmp) - 1));

               tmp:= Copy(tmp, Pos('.', tmp) + 1, Length(tmp));
               right3:= StrToInt(Copy(tmp, 0, Pos('.', tmp) - 1));

               tmp:= Copy(tmp, Pos('.', tmp) + 1, Length(tmp));
               bottom3:= StrToInt(tmp);

               // Prüfen ob Rechtecke sich berühren
               if ((right2 >= left3) and (left2 <= right3) and (top2 >= top3) and (top2 <= bottom3)) then
               begin
                    ok := False;
               end;
          end;

          if ok = False then
          begin
               Result:= False;
          end
          else
          begin
               Result:= True;
          end;
end;