public class ventil
    {
        System.Drawing.Graphics zona_des;
        float x0;
        float y0;
        float w;

        public void setval(float alfa_i, Color culoare_contur, Color culoare_ventil, Color culoare_stergere)
        {
            zona_des.FillPie(new SolidBrush(culoare_ventil), x0, y0, w, w, alfa_i, 90);
            zona_des.FillPie(new SolidBrush(culoare_stergere), x0, y0, w, w, alfa_i + 90, 90);
            zona_des.FillPie(new SolidBrush(culoare_ventil), x0, y0, w, w, alfa_i + 180, 90);
            zona_des.FillPie(new SolidBrush(culoare_stergere), x0, y0, w, w, alfa_i + 270, 90);
            zona_des.DrawEllipse(new Pen(culoare_contur,2), x0, y0, w, w);
        }
        public ventil(System.Drawing.Graphics desen, float pozx, float pozy, float lat)
        {
            zona_des=desen;
            x0 = pozx;
            y0 = pozy;
            w = lat;
        }
    }