retrieves the value of Bezierfunction at t. The degree is given by the count of Points in the array Points.
vaule of the Bezierfunction
xy[] Points = new xy[3]; xy[0] = new xy(0, 0); xy[1] = new xy(1, 3); xy[2] = new xy(4, 3); xy[3] = new xy(6, 0); xy p = funBezier ( Points , 0.4 );