/// <summary>
/// Update all the entities and handle collisions.
/// </summary>
/// <param name="gameTime">Current game time.</param>
void UpdateEntities(GameTime gameTime)
{
_baseEntity.Update(gameTime);
var camera = GetCamera();
var upEnt = _entities.ToList();
//Updates non physics
_nonPhysicsEntities.ForEach(e => e.Update(gameTime));
for (int i = 0; i < upEnt.Count; i++)
{
var ent = upEnt[i];
if (!IsValidEntity(camera, ent))
{
continue;
}
ent.UpdateContext.RunLoop(gameTime);
if (!ent.InteractWithEntities)
{
continue;
}
for (int j = i + 1; j < upEnt.Count; j++)
{
var cEnt = upEnt[j];
if (!cEnt.InteractWithEntities)
{
continue;
}
var dist = ent.Position - cEnt.Position;
var minDist = ent.Size.Y / 2 + cEnt.Size.Y / 2;
// Handle gravity
if (dist != Vector2.Zero)
{
var distSquare = Math.Max(dist.LengthSquared(), 4096);
var direction = Vector2.Normalize(dist);
var intensity = 1000 * (ent.Mass * cEnt.Mass) / distSquare;
ent.ApplyAcceleration(-direction * intensity);
cEnt.ApplyAcceleration(direction * intensity);
}
// Handle collisions
if (dist.Length() < minDist)
{
ResolveCollision(ent, cEnt, gameTime);
}
}
}
}
public void PhysicsUpdate()
{
if (physicsEntity == null)
{
Debug.LogError("Character: PhysicsUpdate(): physics entity is null");
return;
}
// Based on input, accelerate in direction that's being pressed
// Horizontal
if (isMovingLeft)
{
inputVelocityX -= stats.accelerationSpeed;
}
else if (isMovingRight)
{
inputVelocityX += stats.accelerationSpeed;
}
else
{
inputVelocityX /= MOVEMENT_INPUT_FRICTION;
// If inputVelocity is sufficiently close to 0
if (inputVelocityX < 0.001)
{
// snap to 0
inputVelocityX = 0;
}
}
// Vertical
if (isMovingDown)
{
inputVelocityY -= stats.accelerationSpeed;
}
else if (isMovingUp)
{
inputVelocityY += stats.accelerationSpeed;
}
else
{
inputVelocityY /= MOVEMENT_INPUT_FRICTION;
// If inputVelocity is sufficiently close to 0
if (inputVelocityY < 0.001)
{
// snap to 0
inputVelocityY = 0;
}
}
// Clamp to maximum input speed
inputVelocityX = Mathf.Clamp(inputVelocityX, -stats.movementSpeed, stats.movementSpeed);
inputVelocityY = Mathf.Clamp(inputVelocityY, -stats.movementSpeed, stats.movementSpeed);
// Pass calculated velocity to physics entity
physicsEntity.AddInputVelocity(inputVelocityX, inputVelocityY);
physicsEntity.Update();
if (HasAuthority())
{
// Update the local position based on physics simulation
transform.position = physicsEntity.transformPosition;
}
else
{
// Move visual representation a bit closer to the correct position
transform.position = Vector3.Lerp(transform.position, physicsEntity.transformPosition, GetCurrentLerpFactor());
}
}
