public MobType PickRandomMobType(Random rng)
{
MobType result = null;
float random_variable = (float)rng.NextDouble();
for (int entry_index = 0; entry_index < m_entries.Length; entry_index++)
{
MobSpawnTableEntry entry = m_entries[entry_index];
if (random_variable <= entry.cumulative_weight)
{
if (entry.mob_spawn_table != null)
{
result = entry.mob_spawn_table.PickRandomMobType(rng);
}
else
{
result = entry.mob_type;
}
break;
}
}
return(result);
}
public MobSpawnTable(
Dictionary <int, MobSpawnTable> spawnTables,
MobTypeSet mob_types,
MobSpawnTables db_table,
List <MobSpawnTableEntries> db_entries)
{
m_table_id = db_table.MobSpawnTableID;
m_table_name = db_table.MobSpawnTableName;
if (db_entries.Count > 0)
{
// Compute the total non normalized weight
float weight_sum = (float)db_entries.Sum(e => e.Weight);
// Sort the source list by weight and then store in the internal entry array
m_entries = new MobSpawnTableEntry[db_entries.Count];
// Copy over the source entries into the table
// Normalize the weights
for (int entry_index = 0; entry_index < db_entries.Count; entry_index++)
{
MobSpawnTableEntries db_entry = db_entries[entry_index];
MobSpawnTableEntry entry = new MobSpawnTableEntry();
entry.cumulative_weight = (float)db_entry.Weight / weight_sum;
if (db_entry.ReferenceIsMobType)
{
entry.mob_type = mob_types.GetMobTypeById(db_entry.ReferenceID);
entry.mob_spawn_table = null;
}
else
{
entry.mob_type = null;
entry.mob_spawn_table = spawnTables[db_entry.ReferenceID];
}
m_entries[entry_index] = entry;
}
// Sort the weights. Largest weight first.
// We do this so that when we search through the CDF
// we're more likely to find the random entry we're looking for earlier in the array.
m_entries.OrderByDescending(e => e.cumulative_weight);
// Convert the probability density function (PDF) into a cumulative distribution function (CDF)
float accumulator = 0f;
for (int entry_index = 0; entry_index < m_entries.Length; entry_index++)
{
MobSpawnTableEntry entry = m_entries[entry_index];
float weight = entry.cumulative_weight;
entry.cumulative_weight = Math.Min(accumulator + entry.cumulative_weight, 1.0f);
accumulator = accumulator + weight;
}
}
}
public MobSpawnTable(
Dictionary<int, MobSpawnTable> spawnTables,
MobTypeSet mob_types,
MobSpawnTables db_table,
List<MobSpawnTableEntries> db_entries)
{
m_table_id = db_table.MobSpawnTableID;
m_table_name = db_table.MobSpawnTableName;
if (db_entries.Count > 0)
{
// Compute the total non normalized weight
float weight_sum = (float)db_entries.Sum(e => e.Weight);
// Sort the source list by weight and then store in the internal entry array
m_entries = new MobSpawnTableEntry[db_entries.Count];
// Copy over the source entries into the table
// Normalize the weights
for (int entry_index = 0; entry_index < db_entries.Count; entry_index++)
{
MobSpawnTableEntries db_entry = db_entries[entry_index];
MobSpawnTableEntry entry = new MobSpawnTableEntry();
entry.cumulative_weight = (float)db_entry.Weight / weight_sum;
if (db_entry.ReferenceIsMobType)
{
entry.mob_type = mob_types.GetMobTypeById(db_entry.ReferenceID);
entry.mob_spawn_table = null;
}
else
{
entry.mob_type = null;
entry.mob_spawn_table = spawnTables[db_entry.ReferenceID];
}
m_entries[entry_index] = entry;
}
// Sort the weights. Largest weight first.
// We do this so that when we search through the CDF
// we're more likely to find the random entry we're looking for earlier in the array.
m_entries.OrderByDescending(e => e.cumulative_weight);
// Convert the probability density function (PDF) into a cumulative distribution function (CDF)
float accumulator = 0f;
for (int entry_index = 0; entry_index < m_entries.Length; entry_index++)
{
MobSpawnTableEntry entry = m_entries[entry_index];
float weight = entry.cumulative_weight;
entry.cumulative_weight = Math.Min(accumulator + entry.cumulative_weight, 1.0f);
accumulator = accumulator + weight;
}
}
}
