public FluidSystem(SystemManager systemManager, EntityManager entityManager)
{
_systemManager = systemManager;
_entityManager = entityManager;
_physicsSystem = (PhysicsSystem)_systemManager.getSystem(SystemType.Physics);
_renderSystem = (RenderSystem)_systemManager.getSystem(SystemType.Render);
fluidGrid = new Dictionary<int, Dictionary<int, List<int>>>();
liquid = new Particle[MAX_PARTICLES];
activeParticles = new int[MAX_PARTICLES];
_simPositions = new Vector2[MAX_PARTICLES];
_simVelocities = new Vector2[MAX_PARTICLES];
_delta = new Vector2[MAX_PARTICLES];
for (int i = 0; i < MAX_PARTICLES; i++)
{
liquid[i] = new Particle(this, i, LIQUID_ORIGIN);
}
}
// killParticle
private void killParticle(Particle particle)
{
particle.position = LIQUID_ORIGIN;
particle.alive = false;
particle.active = false;
numActiveParticles--;
}
// handleParticleInfluence -- Handles interaction between entities and particles
public void handleParticleInfluence(string levelUid, Particle particle)
{
for (int i = 0; i < particle.entityInfluenceCount; i++)
{
int entityId = particle.entitiesToInfluence[i];
ParticleInfluenceComponent particleInfluenceComponent = _entityManager.getComponent(levelUid, entityId, ComponentType.ParticleInfluence) as ParticleInfluenceComponent;
particleInfluenceComponent.particleCount++;
if (particleInfluenceComponent.type == ParticleInfluenceType.Physical)
{
// Physical body influences -- body-to-particle influences are usually already handled by resolveCollisions()
PhysicsComponent physicsComponent = _entityManager.getComponent(levelUid, entityId, ComponentType.Physics) as PhysicsComponent;
physicsComponent.body.ApplyLinearImpulse(particle.oldPosition - particle.position, particle.oldPosition);
}
else if (particleInfluenceComponent.type == ParticleInfluenceType.Dynamite)
{
// Dynamite influence
PhysicsComponent physicsComponent = _entityManager.getComponent(levelUid, entityId, ComponentType.Physics) as PhysicsComponent;
Vector2 bodyVelocity = physicsComponent.body.LinearVelocity;
physicsComponent.body.LinearVelocity = bodyVelocity * 0.98f + particle.velocity;
physicsComponent.body.AngularVelocity = physicsComponent.body.AngularVelocity * 0.98f;
particle.velocity += bodyVelocity * 0.003f;
}
else if (particleInfluenceComponent.type == ParticleInfluenceType.Character)
{
// Character influence
PhysicsComponent physicsComponent = _entityManager.getComponent(levelUid, entityId, ComponentType.Physics) as PhysicsComponent;
Vector2 bodyVelocity = physicsComponent.body.LinearVelocity;
physicsComponent.body.LinearVelocity = bodyVelocity * 0.95f + particle.velocity;
particle.velocity += bodyVelocity * 0.003f;
}
else if (particleInfluenceComponent.type == ParticleInfluenceType.Explosion)
{
ExplosionComponent explosionComponent = _entityManager.getComponent(levelUid, entityId, ComponentType.Explosion) as ExplosionComponent;
Vector2 relative;
float distanceSq;
Vector2 force;
relative = particle.position - explosionComponent.position;
distanceSq = relative.LengthSquared();
relative.Normalize();
force = relative * (explosionComponent.strength / Math.Max(distanceSq, 1f));
particle.velocity += force * 0.0055f;
}
}
}
