public Drop SelectDropRandomly()
{
//For Unit Test if description is empty drop nothing
if (drops.Length == 0)
{
return(null);
}
for (int i = 0; i < drops.Length; i++)
{
//select an random item out of array, so that the drop rates are correct and the order doesn't matter
int rndIndex = Random.Range(0, drops.Length);
float rnd = Random.value;
DropProbabilityPair pair = drops[rndIndex];
if (rnd < pair.Probability)
{
return(pair.Drop);
}
}
//to an ensure that always omething is droped -> drop an random item out of array
return(drops[Random.Range(0, drops.Length)].Drop);
}
public Drop SelectDropRandomly()
{
float total = 0;
// sum up drop probabilities
for (int i = 0; i < drops.Length; i++)
{
DropProbabilityPair pair = drops[i];
total += pair.Probability;
}
float rnd = Random.Range(0, total);
float curr = 0;
for (int i = 0; i < drops.Length; i++)
{
DropProbabilityPair pair = drops[i];
if (rnd < (curr + pair.Probability))
{
return(pair.Drop);
}
else
{
curr += pair.Probability;
}
}
return(null);
}
public void TestDropHalfHalfDistribution()
{
var lootTable = ScriptableObject.CreateInstance <LootDescription>();
var dropOne = ScriptableObject.CreateInstance <Drop>();
var dropTwo = ScriptableObject.CreateInstance <Drop>();
var pairOne = new DropProbabilityPair();
pairOne.Drop = dropOne;
pairOne.Probability = .5f;
var pairTwo = new DropProbabilityPair();
pairTwo.Drop = dropTwo;
pairTwo.Probability = .5f;
DropProbabilityPair[] pair = { pairOne, pairTwo };
lootTable.SetDrops(pair);
for (int i = 0; i < 100; i++)
{
Drop drop = lootTable.SelectDropRandomly();
Assert.IsNotNull(drop);
}
}
public void TestThatOrderIsIrrelevant()
{
var lootTable = ScriptableObject.CreateInstance <LootDescription>();
var lootTableSwitched = ScriptableObject.CreateInstance <LootDescription>();
var dropOne = ScriptableObject.CreateInstance <Drop>();
var dropTwo = ScriptableObject.CreateInstance <Drop>();
dropOne.DropName = "One";
dropTwo.DropName = "Two";
var pairOne = new DropProbabilityPair();
pairOne.Drop = dropOne;
pairOne.Probability = .1f;
var pairTwo = new DropProbabilityPair();
pairTwo.Drop = dropTwo;
pairTwo.Probability = .9f;
DropProbabilityPair[] pair = { pairOne, pairTwo };
DropProbabilityPair[] pairSwitched = { pairTwo, pairOne };
lootTable.SetDrops(pair);
lootTableSwitched.SetDrops(pairSwitched);
Drop[] resultOne = new Drop[1000];
Drop[] resultSwitched = new Drop[1000];
for (int i = 0; i < 1000; i++)
{
resultOne[i] = lootTable.SelectDropRandomly();
resultSwitched[i] = lootTableSwitched.SelectDropRandomly();
}
int rOneCount = 0, rSwitchedCount = 0;
foreach (Drop drop in resultOne)
{
if (drop.DropName == "One")
{
rOneCount++;
}
}
foreach (Drop drop in resultSwitched)
{
if (drop.DropName == "One")
{
rSwitchedCount++;
}
}
Assert.GreaterOrEqual(rOneCount, 80);
Assert.GreaterOrEqual(rSwitchedCount, 80);
Assert.LessOrEqual(rOneCount, 130);
Assert.LessOrEqual(rSwitchedCount, 130);
}
public Drop SelectDropRandomly()
{
for (int i = 0; i < drops.Length; i++)
{
float rnd = Random.value;
DropProbabilityPair pair = drops[i];
if (rnd < pair.Probability)
{
return(pair.Drop);
}
}
return(null);
}