//List
public List<Compression.Valor> crearShannonFano(List<Compression.Valor> valores)
{
int i,j;
NodoShannonFano temp = new NodoShannonFano();
for (i = 0; i < valores.Count; i++)
{
NodoShannonFano valor = new NodoShannonFano();
valor.sym = valores[i].nombre;
valor.pro = (float)valores[i].probabilidad;
totalprobabilidad = totalprobabilidad + valores[i].probabilidad;
s.Add(valor);
}
NodoShannonFano aux = new NodoShannonFano();
aux.pro = 0;
s.Add(aux);
//Console.Write("El valor de i es: "+i.ToString());
s[i].pro = 1 - (float)totalprobabilidad;
for(j = 1; j <= valores.Count - 1; j++)
{
for (i = 0; i < valores.Count - 1; i++)
{
if ((s[i].pro) > (s[i + 1].pro))
{
temp.pro = s[i].pro;
temp.sym = s[i].sym;
s[i].pro = s[i + 1].pro;
s[i].sym = s[i + 1].sym;
s[i + 1].pro = temp.pro;
s[i + 1].sym = temp.sym;
}
}
}
for (i = 0; i < valores.Count + 1; i++)
{
s[i].top = -1;
s[i].arr = new int[20] { 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 };
}
ShannonFano shannon = new ShannonFano();
shannon.desarrollo(0, valores.Count - 1, s, valores);
return valores;
}
public void desarrollo(int l, int h, List<NodoShannonFano> s, List<Compression.Valor> valores)
{
float pack1 = 0, pack2 = 0, diff1 = 0, diff2 = 0;
int i, k=0, j;
String[] aux;
aux = new string[valores.Count];
if ((l + 1) == h || l == h || l > h)
{
if (l == h || l > h)
{
return;
}
s[h].arr[++(s[h].top)] = 0;
s[l].arr[++(s[l].top)] = 1;
return;
}
else
{
for (i = l; i <= h - 1; i++)
{
pack1 = pack1 + s[i].pro;
}
pack2 = pack2 + s[h].pro;
diff1 = pack1 - pack2;
if (diff1 < 0)
{
diff1 = diff1 * -1;
}
j = 2;
while (j != h - l + 1)
{
k = h - j;
pack1 = pack2 = 0;
for (i = l; i <= k; i++)
{
pack1 = pack1 + s[i].pro;
}
for (i = h; i > k; i--)
{
pack2 = pack2 + s[i].pro;
}
diff2 = pack1 - pack2;
if (diff2 < 0)
{
diff2 = diff2 * -1;
}
if (diff2 >= diff1)
{
break;
}
diff1 = diff2;
j++;
}
k++;
for (i = l; i <= k; i++)
{
s[i].arr[++(s[i].top)] = 1;
}
for (i = k + 1; i <= h; i++)
{
s[i].arr[++(s[i].top)] = 0;
}
ShannonFano shannon = new ShannonFano();
shannon.desarrollo(l, k, s, valores);
shannon.desarrollo(k + 1, h, s, valores);
for (i = 0; i < valores.Count ; i++)
{
for (j = 0; j <= s[i].arr.Length-1; j++)
{
aux[i] = aux[i] + s[i].arr[j].ToString();
}
valores[i].codigoshannonfano = aux[i].Trim(new Char[] { '2' });
}
}
}
