protected override void InternalUpdateSpread(GridSpace otherSpace)
{
// Water -> Water spread
Component water;
if (!otherSpace.m_components.TryGetValue(ComponentType.Water, out water))
{
// Adjacent space has no air so we need to create some
water = otherSpace.AddType <Water>();
water.m_amountRemaining = 0.0f;
}
float difference = m_amountRemaining - water.m_amountRemaining;
// If the two spaces are close to a pressure equilibrium then don't bother doing anything.
if (Mathf.Abs(difference) > 0.01f)
{
float average = (m_amountRemaining + water.m_amountRemaining) * 0.5f;
// Water increases/decreases based on the adjacent space.
float oldAmount = m_amountRemaining;
float newAmount = Mathf.Lerp(m_amountRemaining, average, Simulation.DeltaTime * 0.25f);
float delta = (newAmount - oldAmount);
m_amountRemaining += delta;
// The delta moves to/from the adjacent space
water.m_amountRemaining -= delta;
}
}
protected override void InternalUpdateChemistry(GridSpace selfSpace)
{
var interactions = selfSpace.m_components;
// Fire burns some of the plant
if (interactions.ContainsKey(ComponentType.Fire))
{
Debug.Log("Plant amount reduced by fire burning it.");
// TODO: Could reduce the amount of air based on the amount of fire.
// TODO: Burn rate of plant could depend on the type of plant
m_amountRemaining -= Simulation.DeltaTime * 0.1f;
}
// Plants create air
Component air = null;
if (!interactions.TryGetValue(ComponentType.Air, out air))
{
// If no air exists then create some
air = selfSpace.AddType <Air>();
}
// 1000 seconds to fill a grid space with air, if the plant is full size
air.m_amountRemaining += Simulation.DeltaTime * 0.001f * m_amountRemaining;
if (interactions.ContainsKey(ComponentType.Water))
{
Debug.Log("Plant growing because water is present.");
// TODO: Could also require light to grow
m_amountRemaining += Simulation.DeltaTime * 0.001f;
}
else
{
Debug.Log("Plant wilting because water is not present.");
m_amountRemaining -= Simulation.DeltaTime * 0.0025f;
}
}
private void FireToNewAreaSpread(GridSpace otherSpace)
{
// Random chance to spread (based on strength of fire)
float roll = Random.Range(0.0f, m_amountRemaining);
// 25% chance per second (if fire is full strength)
float odds = 1 - 0.25f * Simulation.DeltaTime;
// If we didn't beat the odds then the fire doesn't spread yet
if (roll < odds)
{
return;
}
// Cannot be wet
if (otherSpace.m_components.ContainsKey(ComponentType.Water))
{
return;
}
// Must have plant (fuel)
if (!otherSpace.m_components.ContainsKey(ComponentType.Plant))
{
return;
}
// Must have enough air to spread
Component air;
if (!otherSpace.m_components.TryGetValue(ComponentType.Air, out air) || air.m_amountRemaining < 0.1f)
{
return;
}
Debug.LogWarning("Fire has spread to " + otherSpace.m_object.name);
var fire = otherSpace.AddType <Fire>();
fire.m_amountRemaining = 0.05f; // Start new fire out small
}