Agrade�o a todos que me ajudaram, mas agora tem outro poblema.
quando fui compilar, deu erro no m�todo paint().
Ali eu to desenhando um pol�gono e uma circulo, e os errros s�o:
 
H:\GuiaVotuporanga\mapa\Mapa.java:98: Incompatible type for array. Explicit cast needed to convert double to int.
  int x[] = {E - 3, E-6, E + 5, E - 3};
            ^
H:\GuiaVotuporanga\mapa\Mapa.java:99: Incompatible type for array. Explicit cast needed to convert double to int.
  int y[] = {A - 15, A, A - 15, A - 15};
            ^
H:\GuiaVotuporanga\mapa\Mapa.java:108: Incompatible type for method. Explicit cast needed to convert double to int.
  screen.fillOval(E - 5, A - 18, B, B);
                    ^
H:\GuiaVotuporanga\mapa\Mapa.java:108: Incompatible type for method. Explicit cast needed to convert double to int.
  screen.fillOval(E - 5, A - 18, B, B);
                           ^
H:\GuiaVotuporanga\mapa\Mapa.java:110: Incompatible type for method. Explicit cast needed to convert double to int.
  screen.drawOval(E - 5, A - 18, B, B);
                    ^
H:\GuiaVotuporanga\mapa\Mapa.java:110: Incompatible type for method. Explicit cast needed to convert double to int.
  screen.drawOval(E - 5, A - 18, B, B);
                           ^
 
O problema � que eu tenho que acrescentar n�meros fracionados para desenhar esse pol�gono no lugar certo com precis�o.

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