/// <summary>
/// Find whether or not the plant is currently toxic. Toxicity can change
/// and is a semi-random property.
/// The plant is toxic with probability (t/100) * (a/50), where:
/// t: toxicity factor of the plant, determined upon creation,
/// 100: the maximum toxicity factor of a plant,
/// a: the age of the plant,
/// 50: the maximum age of a plant.
/// </summary>
/// <returns>True if the plant is toxic, false otherwise.</returns>
public bool IsToxic()
{
// Calculate the toxicity probability according to the formula above
double prob = (((double)ToxicityFactor) / TOXICITY_FACTOR_UPPER_BOUND) *
(((double)Age) / Senescence);
// Use the probability to determine whether the plant is toxic or not
return(ProbabilityHelper.EvaluateIndependentPredicate(prob));
}
/// <summary>
/// Construct a new Plant unit
/// </summary>
/// <param name="row"> The row of the Plant within the grid. </param>
/// <param name="col"> The column of the Plant within the grid. </param>
public Plant(int row = -1, int col = -1) : base(Enums.UnitType.Plant, senescence: 50,
foodRequirement: 5, waterRequirement: 25,
gasRequirement: 4, inputGas: Enums.GasType.CarbonDioxide,
outputGas: Enums.GasType.Oxygen, idealTemperature: 35,
infectionResistance: 7, decompositionValue: 10, row: row, col: col)
{
// Generate a unique toxicity factor for this plant -- used to calculate its toxicity
ToxicityFactor = ProbabilityHelper.RandomInteger(TOXICITY_FACTOR_LOWER_BOUND, TOXICITY_FACTOR_UPPER_BOUND);
// Store the minimum water requirement for a plant
BaselineWaterRequirement = WaterRequirement;
}
/// <summary>
/// Checks if the unit should increase in age. This is probabilistic. A Unit
/// cannot age past its age of senescence.
/// </summary>
/// <remarks>
/// Author: Tiffanie Truong
/// </remarks>
/// <param name="gameEnv"></param>
/// <returns>True if the Unit should age, false otherwise.</returns>
private bool ShouldAge(Environment gameEnv)
{
// Calculate the probability that the Unit should age
double ageProbability = AgeProbability(gameEnv);
// If the Unit's age is at its max, do not age
if (Age == Senescence)
{
return(false);
}
// Otherwise, probabilistically determine if it should age based on its conditions
return(ProbabilityHelper.EvaluateIndependentPredicate(ageProbability));
}
/// <summary>
/// Determines if the unique environmental event begins in the environment
/// </summary>
/// <returns> True if the environmental event begins and false otherwise </returns>
public bool EventStarts()
{
// Probabilistically evaluate whether the event should occur in order to initiate it
if (ProbabilityHelper.EvaluateIndependentPredicate(PROBABILITY_OF_ENV_EVENT / 100.0))
{
// Indicate that the environmental event will begin occurring for the next 5 generations
EnvEventOccurring = true;
EventGenerationsLeft = 5;
return(true);
}
// If the probability fails, the event does not start
return(false);
}
/// <summary>
/// Determines if it starts raining in the environment
/// </summary>
/// <returns> True if it starts raining in the environment and false otherwise </returns>
public bool WillRain()
{
// Probabilistically evaluate whether it will rain in order to initiate raining
if (ProbabilityHelper.EvaluateIndependentPredicate(probabilityOfRain / 100.0))
{
// Indicate that it is raining for the next 5 generations
IsRaining = true;
EventGenerationsLeft = 5;
return(true);
}
// If the probability fails, it does not start raining
return(false);
}
/// <summary>
/// Performs photosynthesis, consuming a random amount of the carbon dioxide and water to return food to the environment
/// </summary>
/// <remarks> Tiffanie Truong </remarks>
/// <param name="gameEnv"> The Environment of the simulation that the plants reside in </param>
protected void Photosynthesize(Environment gameEnv)
{
// Generate how many carbon dioxide and water units are consumed to turn into food
int resourceUsage =
ProbabilityHelper.RandomInteger(PHOTOSYNTHESIS_RESOURCE_LOWER_BOUND, PHOTOSYNTHESIS_RESOURCE_UPPER_BOUND);
// Check if there is enough carbon dioxide and water in the environment to create this given amount of food
if (resourceUsage <= gameEnv.CarbonDioxideLevel &&
resourceUsage <= gameEnv.WaterAvailability)
{
// Perform photosynthesis and create more food
gameEnv.IncreaseFood(resourceUsage);
// Consume water and carbon dioxide in the environment
gameEnv.DecreaseFood(resourceUsage);
gameEnv.DecreaseWater(resourceUsage);
}
}
/// <summary>
/// Compute which Multicellular type a Colony should merge into: Plant or Animal.
/// This is probabilistically based on the atmosphere of the Environment:
/// The more carbon dioxide in the atmosphere, the more likely it is for a Plant to be formed.
/// </summary>
/// <remarks>
/// Author: Rudy Ariaz
/// </remarks>
/// <param name="gameEnv">The Environment of the Colony.</param>
/// <returns>Enums.Animal if an Animal should be formed upon merging, Enums.Plant if a Plant
/// should be formed upon merging.</returns>
private Enums.UnitType GetMergeType(Environment gameEnv)
{
// The probability to merge into a plant is the normalized percentage
// of the atmosphere that is carbon dioxide
double plantProbability = gameEnv.CarbonDioxideLevel / 100.0;
// Check if a Plant should be formed
if (ProbabilityHelper.EvaluateIndependentPredicate(plantProbability))
{
// Return Plant as the type of Multicellular organism to be formed
return(Enums.UnitType.Plant);
}
// Otherwise, an Animal should be formed
else
{
// Return Animal as the type of Multicellular organism to be formed
return(Enums.UnitType.Animal);
}
}
/// <summary>
/// Given probabilities for a new child Unit (a Unit occupying a previously-empty block)
/// to be of each of its neighbors' species, find the neighbor with the same species as the child Unit.
/// </summary>
/// <param name="neighborProbabilities">A mapping between a block's neighbors, and the cumulative probabilities
/// that each of them will be selected as a model neighbor.</param>
/// <returns>The non-null Unit (one of the block's neighbors) whose type is the same
/// as the child Unit's type.</returns>
private static Unit GetModelNeighbor(Dictionary <Unit, double> neighborProbabilities)
{
// Convert the dictionary into an iterable list of key-value pairs, sorted in ascending order
// since the probabilities are cumulative
var neighbors =
(from neighbor
in neighborProbabilities
orderby neighbor.Value
ascending
select neighbor).ToList();
// Get just the probabilities of each neighbor being selected as the model neighbor
double[] sortedProbabilities = neighbors.Select(x => x.Value).ToArray();
// Keep, in a parallel array, the neighbors corresponding to each probability
Unit[] correspondingSpecies = neighbors.Select(x => x.Key).ToArray();
// Get the index of the neighbor probabilistically selected to serve as a model neighbor
int indexSelected = ProbabilityHelper.EvaluateDependentPredicate(sortedProbabilities);
// Return the model neighbor
return(correspondingSpecies[indexSelected]);
}
/// <summary>
/// Determine whether the LivingUnit is cured of infection.
/// </summary>
/// <remarks>
/// Author: Rudy Ariaz
/// </remarks>
/// <returns>True if the LivingUnit is cured, false otherwise.</returns>
protected bool IsCured()
{
// Evaluate whether the Unit is cured or not, depending on the cure probability
return(ProbabilityHelper.EvaluateIndependentPredicate(CureProbabillity()));
}