//TODO: Make this account for attack range and entity size.
//TODO: Maybe make this not allow them to leave their platform as well, just to avoid issues with pathing.
private void FollowEntity(Entity e, GameTime Time)
{
var entity = this.Parent;
Random r = new Random();
float attackRange = AttributesComponent.MeleeAttackRange.X;
if (entity.Location.Contains((int)e.Location.Center.X, (int)e.Location.Center.Y))
{
if (!PhysicsComponent.IsGrounded)
return; // Do nothing, just wait for us to fall on our location.
}
else
{
bool MissingHorizontally = e.Location.Center.X - attackRange > entity.Location.Right || e.Location.Center.X + attackRange < entity.Location.Left;
if (entity.Location.Bottom > e.Location.Bottom && !MissingHorizontally)
{
if (CanJumpToChase)
MovementComponent.Jump(AllowMultiJump);
}
if (MissingHorizontally)
{
//Most of this code prevents the AI from jumping off their current platform to chase player.
//Often results in death.
float checkDistance = PhysicsComponent.VelocityX * Time.GetTimeScalar();
Vector2 leftPlatformVector = new Vector2(Parent.Location.Left + checkDistance, Parent.Location.Bottom + 1);
Vector2 rightPlatformVector = new Vector2(Parent.Location.Right + checkDistance, Parent.Location.Bottom + 1);
Vector2 leftWallVector = new Vector2(Parent.Location.Left + checkDistance, Parent.Location.Center.Y);
Vector2 rightWallVector = new Vector2(Parent.Location.Right + checkDistance, Parent.Location.Center.Y);
bool leftPossible = PhysicsSystem.IsLocationSolid(leftPlatformVector) && !PhysicsSystem.IsLocationSolid(leftWallVector);
bool rightPossible = PhysicsSystem.IsLocationSolid(rightPlatformVector) && !PhysicsSystem.IsLocationSolid(rightWallVector);
if (entity.Location.Center.X > e.Location.Center.X + attackRange)
{
if (leftPossible)
MovementComponent.BeginWalking(Direction.Left);
else
MovementComponent.StopWalking();
}
else if (entity.Location.Center.X < e.Location.Center.X - attackRange)
{
if (rightPossible)
MovementComponent.BeginWalking(Direction.Right);
else
MovementComponent.StopWalking();
}
}
else
{
if (MovementComponent.IsWalking)
MovementComponent.StopWalking();
}
//Ensure they are facing the correct direction, if they move within AI rectangle.
if (entity.Location.Center.X > e.Location.Center.X)
{
MovementComponent.CurrentDirection = Direction.Left;
}
else if (entity.Location.Center.X < e.Location.Center.X)
{
MovementComponent.CurrentDirection = Direction.Right;
}
}
}
protected override void OnUpdate(GameTime Time)
{
base.OnUpdate(Time);
if (AIEnabled)
{
//Begin process of death if entity has run out of health.
if (((AttributesComponent.CurrentHealth / AttributesComponent.MaxHealth) * 100) < 10)
{
if (!DeathStarted)
DeathTime = DateTime.Now;
DeathStarted = true;
}
//Begin process of fleeing if entity's health is <25%.
if (((AttributesComponent.CurrentHealth / AttributesComponent.MaxHealth) * 100) < 25)
{
FleeingStarted = true;
}
bool shouldFlee = FleeingStarted && FleeingEnabled;
bool shouldDie = DeathStarted && DeathEnabled;
if (!shouldFlee && !shouldDie) //NORMAL AI
{
bool foundEntity = false;
bool projectileFlyingToMe = false;
bool entityAttackingMe = false;
bool entityAttackable = false;
bool entityFollowable = false;
Entity entityToFollow = null;
//TODO: This could be very ineffecient.
//Foreach entity in this entity's reaction box.
foreach (Entity e in PhysicsSystem.GetEntitiesAtLocation(GetReactionBox()))
{
var clc = e.GetComponent<ClassificationComponent>();
var coc = e.GetComponent<CombatComponent>();
if (clc.Classification == EntityClassification.Player) //If Player
{
foundEntity = true;
entityFollowable = true;
entityToFollow = e;
if (coc.IsAttacking && WithinEntitysAttackRange(e) && EntityFacingMe(e))
entityAttackingMe = true;
if (!MovementComponent.IsWalking && EntityWithinAttackRange(e))
entityAttackable = true;
}
else if (clc.Classification == EntityClassification.Projectile) //If Projectile
{
foundEntity = true;
//Basically, projectiles within our rectangle might hit us, so we'll just block.
if (EntityGoingToMe(e))
projectileFlyingToMe = true;
}
}
if (foundEntity) //If we found an entity.
{
//We're reacting to an entity.
IsReacting = true;
//If we're following a path and we're aggressive, stop following the path.
if (PathComponent.PathingEnabled && Aggressive)
{
PathComponent.StopFollowing();
}
//If we're able to follow an entity and we're aggressive, follow the entity.
if (entityFollowable && entityToFollow != null && Aggressive)
{
FollowEntity(entityToFollow, Time);
}
//If an entity is attackable and if i (the enemy) am not blocking, attack.
if (entityAttackable && !CombatComponent.IsBlocking)
{
CombatComponent.AttackAI();
}
}
else //If we found nothing.
{
IsReacting = false;
//Resume following the path.
if (!PathComponent.PathingEnabled)
PathComponent.StartFollowing();
}
//If a projectile is coming to us, or an entity is attacking us, block.
if (entityAttackingMe || projectileFlyingToMe)
{
if (!CombatComponent.IsBlocking)
CombatComponent.BeginBlock();
}
//If there's no projectile coming to us, or no entity attacking us, end the block.
if (!entityAttackingMe && !projectileFlyingToMe)
{
if (CombatComponent.IsBlocking)
CombatComponent.EndBlock();
}
}
else if (shouldDie) //DYING AI
{
//Stop blocking if we were doing so at the moment death occured.
if (CombatComponent.IsBlocking)
CombatComponent.EndBlock();
Direction walkDirection = MovementComponent.WalkDirection == Direction.Left ? Direction.Right : Direction.Left;
double walkTime = 200;
if ((DateTime.Now - DeathTime).TotalMilliseconds > walkTime)
{
MovementComponent.BeginWalking(walkDirection);
DeathTime = DateTime.Now;
}
}
else if (shouldFlee) //FLEEING AI
{
//Stop blocking if we were doing so at the moment fleeing occured.
if (CombatComponent.IsBlocking)
CombatComponent.EndBlock();
float checkDistance = PhysicsComponent.VelocityX * Time.GetTimeScalar();
//Run back and forth on platform.
Vector2 leftPlatformVector = new Vector2(Parent.Location.Left + checkDistance, Parent.Location.Bottom + 1);
Vector2 rightPlatformVector = new Vector2(Parent.Location.Right + checkDistance, Parent.Location.Bottom + 1);
Vector2 leftWallVector = new Vector2(Parent.Location.Left + checkDistance, Parent.Location.Center.Y);
Vector2 rightWallVector = new Vector2(Parent.Location.Right + checkDistance, Parent.Location.Center.Y);
bool leftPossible = PhysicsSystem.IsLocationSolid(leftPlatformVector) && !PhysicsSystem.IsLocationSolid(leftWallVector);
bool rightPossible = PhysicsSystem.IsLocationSolid(rightPlatformVector) && !PhysicsSystem.IsLocationSolid(rightWallVector);
//Set a location if one hasn't been set (default is Direction.Down). Very unlikely to happen here, but can't say impossible.
if (MovementComponent.CurrentDirection == Direction.Down)
MovementComponent.CurrentDirection = Direction.Left;
if (MovementComponent.CurrentDirection == Direction.Left)
{
if (leftPossible)
MovementComponent.BeginWalking(Direction.Left);
else if (rightPossible)
MovementComponent.BeginWalking(Direction.Right);
}
else if (MovementComponent.CurrentDirection == Direction.Right)
{
if (rightPossible)
MovementComponent.BeginWalking(Direction.Right);
else if (leftPossible)
MovementComponent.BeginWalking(Direction.Left);
}
}
}
}
/// <summary>
/// Decides which direction the AI should walk to follow the path. Simple x value check.
/// </summary>
/// <param name="Time"></param>
protected override void OnUpdate(GameTime Time)
{
if (PathingEnabled)
{
if (Nodes.Count != 0)
{
var entity = this.Parent;
var mc = entity.GetComponent<MovementComponent>();
var pc = entity.GetComponent<PhysicsComponent>();
var ps = Scene.GetSystem<PhysicsSystem>();
//Formerly Vector2.Distance(entity.Position, CurrentNode) for Y stuff, but not needed.
if (entity.Location.Contains((int)CurrentNode.X, (int)CurrentNode.Y))
{
if (!pc.IsGrounded)
return; // Do nothing, just wait for us to fall on our location.
AdvanceNode();
}
else
{
bool MissingHorizontally = CurrentNode.X > entity.Location.Right || CurrentNode.X < entity.Location.Left;
if (entity.Location.Top > CurrentNode.Y && /*(DateTime.Now - _LastJump).TotalMilliseconds > JumpDelay &&*/ !MissingHorizontally)
{
mc.Jump(AllowMultiJump);
_LastJump = DateTime.Now;
}
if (MissingHorizontally)
{
if (entity.Location.Left > CurrentNode.X)
{
mc.BeginWalking(Direction.Left);
// Check if we'll need to jump this frame.
if (!ps.IsLocationSolid(new Vector2(entity.Location.Left - pc.VelocityX * Time.GetTimeScalar(), entity.Location.Bottom + 5)))
mc.Jump(AllowMultiJump);
}
else if (entity.Location.Right < CurrentNode.X)
{
mc.BeginWalking(Direction.Right);
if (!ps.IsLocationSolid(new Vector2(entity.Location.Right + pc.VelocityX * Time.GetTimeScalar(), entity.Location.Bottom + 5)))
mc.Jump(AllowMultiJump);
}
}
else
mc.StopWalking();
}
}
else
{
float checkDistance = PhysicsComponent.VelocityX * Time.GetTimeScalar();
//Run back and forth on platform.
//This is fairly close to fleeing AI.
Vector2 leftPlatformVector = new Vector2(Parent.Location.Left + checkDistance, Parent.Location.Bottom + 1);
Vector2 rightPlatformVector = new Vector2(Parent.Location.Right + checkDistance, Parent.Location.Bottom + 1);
Vector2 leftWallVector = new Vector2(Parent.Location.Left + checkDistance, Parent.Location.Center.Y);
Vector2 rightWallVector = new Vector2(Parent.Location.Right + checkDistance, Parent.Location.Center.Y);
bool leftPossible = PhysicsSystem.IsLocationSolid(leftPlatformVector) && !PhysicsSystem.IsLocationSolid(leftWallVector);
bool rightPossible = PhysicsSystem.IsLocationSolid(rightPlatformVector) && !PhysicsSystem.IsLocationSolid(rightWallVector);
//Set a location if one hasn't been set (default is Direction.Down), which is likely when we have no path.
if (MovementComponent.CurrentDirection == Direction.Down)
MovementComponent.CurrentDirection = Direction.Left;
if (MovementComponent.CurrentDirection == Direction.Left)
{
if (leftPossible)
MovementComponent.BeginWalking(Direction.Left);
else if (rightPossible)
MovementComponent.BeginWalking(Direction.Right);
}
else if (MovementComponent.CurrentDirection == Direction.Right)
{
if (rightPossible)
MovementComponent.BeginWalking(Direction.Right);
else if (leftPossible)
MovementComponent.BeginWalking(Direction.Left);
}
}
}
base.OnUpdate(Time);
}
private void PerformStaticCollision(GameTime Time)
{
// This is safe to multi-thread because we're never modifying anything besides the Component itself.
// But each iteration is so cheap that the overhead of threading outweighs performance benefits.
List<Task> Tasks = new List<Task>();
foreach(var Component in GetFilteredComponents<PhysicsComponent>()) {
var Parent = Component.Parent;
if(!Component.IsGrounded)
Component.VelocityY += Gravity * Time.GetTimeScalar() * Parent.GetComponent<PhysicsComponent>().GravityCoefficient; //Prolly not the best thing to do GetComponent, eventually make something else.
//if(Component.IsMoving) {
float CurrSign = Math.Sign(Component.VelocityX);
Component.VelocityX += -CurrSign * HorizontalDrag * Time.GetTimeScalar() * Parent.GetComponent<PhysicsComponent>().HorizontalDragCoefficient;
if(Math.Sign(Component.VelocityX) != CurrSign)
Component.VelocityX = 0;
//}
Vector2 PositionDelta = Component.Velocity * Time.GetTimeScalar();
// First, handle falling. Check for collision a bit below bottom + PositionDelta, and put them back to the top of the tile if hit.
if(Component.VelocityY >= 0 && CheckStaticCollision(Parent, new Vector2(0, (Parent.Size.Y / 2) + PositionDelta.Y + 1), (Tile) => new Vector2(Parent.Position.X, Tile.Location.Top - Parent.Size.Y))) {
// We're going to hit a tile while falling, so stop falling.
Component.IsGrounded = true;
Component.VelocityY = 0;
PositionDelta.Y = 0;
} else {
// Otherwise, we're not grounded, and check for collision above.
Component.IsGrounded = false;
if(Component.VelocityY < 0 && CheckStaticCollision(Parent, new Vector2(0, (-Parent.Size.Y / 2) + PositionDelta.Y - 1), (Tile) => new Vector2(Parent.Position.X, Tile.Location.Bottom))) {
Component.VelocityY = 0;
PositionDelta.Y = 0;
}
}
// Now, check horizontal collision.
if(Component.VelocityX >= 0.001f && CheckStaticCollision(Parent, new Vector2(Parent.Size.X / 2 + PositionDelta.X + 1, 0), (Tile) => new Vector2(Tile.Location.Left - Parent.Size.X, Parent.Position.Y))) {
PositionDelta.X = 0;
Component.VelocityX = 0;
} else if(Component.VelocityX <= 0.001f && CheckStaticCollision(Parent, new Vector2(-Parent.Size.X / 2 + PositionDelta.X - 1, 0), (Tile) => new Vector2(Tile.Location.Right, Parent.Position.Y))) {
PositionDelta.X = 0;
Component.VelocityX = 0;
}
Parent.Position += PositionDelta;
Parent.Y = Math.Max(0, Parent.Y);
Parent.X = Math.Max(-Scene.TileSize.X / 2, Parent.X);
Parent.X = Math.Min(Scene.MapSize.X - Scene.TileSize.X, Parent.X);
// Special case: If we're at the bottom of the level, we should be considered grounded.
if(Parent.Y > Scene.MapSize.Y - Parent.Size.Y) {
Parent.Y = Scene.MapSize.Y - Parent.Size.Y;
Component.VelocityY = 0;
Component.IsGrounded = true;
}
}
}
protected override void OnUpdate(GameTime Time)
{
base.OnUpdate(Time);
if(_WalkDirection == Direction.Left)
PhysicsComponent.VelocityX -= Math.Max(0, Math.Min(MaxWalkingSpeed + PhysicsComponent.VelocityX, WalkAcceleration * Time.GetTimeScalar()));
else if(_WalkDirection == Direction.Right)
PhysicsComponent.VelocityX += Math.Max(0, Math.Min(MaxWalkingSpeed - PhysicsComponent.VelocityX, WalkAcceleration * Time.GetTimeScalar()));
if(!PhysicsComponent.IsGrounded && _WasGrounded)
_LastUngrounded = DateTime.Now;
_WasGrounded = PhysicsComponent.IsGrounded;
if(PhysicsComponent.IsGrounded && !_JumpedThisFrame) // This may be called after the Jump, before PhysicsSystem updates position.
_JumpedSinceUngrounded = false;
_JumpedThisFrame = false;
}
