private bool SetAboveGroundIfNeeded(IEditableEntity entity)
{
var position = entity.Get <Position>();
var height = TextureManager.GetTexture(entity.Get <SpriteSheet>()).Height;
if ((position.Y - height / 2) <= GroundLevel)
{
entity.Set(position.SetY(GroundLevel + height / 2));
entity.Set(entity.Get <Velocity>().UpdateYVelocity(vy => vy < 0 ? 0 : vy));
return(true);
}
return(false);
}
public void Update(IEditableEntity entity, long frame)
{
var sheet = entity.Get <SpriteSheet>();
var animated = entity.Get <Animated>();
if (frame % animated.AnimationSpeed == 0)
{
animated = animated.SetCurrentFrame(animated.CurrentFrame + 1);
if (animated.CurrentFrame >= sheet.FrameCount)
{
animated = animated.SetCurrentFrame(0);
}
entity.Set(animated);
}
}
public void Update(IEditableEntity entity, long frame)
{
var player = entity.Get <Player>();
var inputState = InputManager.GetInputState(player.PlayerID, frame);
var position = entity.Get <Position>();
var velocity = entity.Get <Velocity>();
position = entity.Set(position + velocity);
bool onGround = SetAboveGroundIfNeeded(entity);
velocity = entity.Set(velocity.UpdateXVelocity(vx => vx * (onGround ? GroundFriction : AirFriction)));
if (velocity.X != 0)
{
entity.Set(entity.Get <Animated>().SetFlipped(velocity.X < 0));
}
switch (player.CurrentState)
{
case PlayerState.Idle:
entity.Set(Idle);
if (inputState.Up.IsDown() || !onGround)
{
entity.Set(player.SetState(PlayerState.Falling));
if (onGround)
{
entity.Set(velocity.SetYVelocity(JumpSpeed));
}
}
else
{
if (inputState.Left.IsDown() && inputState.Right.IsUp())
{
entity.Set(player.SetState(PlayerState.WalkingLeft));
}
if (inputState.Right.IsDown() && inputState.Left.IsUp())
{
entity.Set(player.SetState(PlayerState.WalkingRight));
}
}
break;
case PlayerState.Falling:
entity.Set(Falling);
if (onGround)
{
entity.Set(player.SetState(PlayerState.Idle));
entity.Set(velocity.SetYVelocity(0));
}
else
{
entity.Set(velocity.UpdateYVelocity(vy => vy - GravityAcceleration));
}
break;
case PlayerState.WalkingLeft:
entity.Set(Run);
entity.Set(entity.Get <Animated>().SetFlipped(true));
entity.Set(velocity.UpdateXVelocity(vx => vx - RunSpeed));
if (inputState.Left.IsUp() || inputState.Right.IsDown() || inputState.Up.IsDown())
{
entity.Set(player.SetState(PlayerState.Idle));
}
break;
case PlayerState.WalkingRight:
entity.Set(Run);
entity.Set(entity.Get <Animated>().SetFlipped(false));
entity.Set(velocity.UpdateXVelocity(vx => vx + RunSpeed));
if (inputState.Right.IsUp() || inputState.Left.IsDown() || inputState.Up.IsDown())
{
entity.Set(player.SetState(PlayerState.Idle));
}
break;
}
}