Godot Camera Systems

extends Camera2D

## Target node to follow (assign in Inspector or via code)
@export var target: Node2D

## How quickly the camera catches up to the target (higher = snappier)
@export var follow_speed: float = 8.0

## How far ahead the camera leads in the movement direction
@export var look_ahead_distance: float = 80.0

## How quickly the look-ahead offset responds to direction changes
@export var look_ahead_speed: float = 4.0

var _look_ahead_offset: Vector2 = Vector2.ZERO
var _previous_target_pos: Vector2 = Vector2.ZERO

func _ready() -> void:
    # Disable built-in smoothing — we handle it manually
    position_smoothing_enabled = false
    if target:
        _previous_target_pos = target.global_position
        global_position = target.global_position

func _process(delta: float) -> void:
    if not target:
        return

    # Compute movement direction from last frame
    var move_delta: Vector2 = target.global_position - _previous_target_pos
    _previous_target_pos = target.global_position

    # Smoothly steer look-ahead offset toward movement direction
    var desired_ahead: Vector2 = move_delta.normalized() * look_ahead_distance if move_delta.length() > 0.5 else Vector2.ZERO
    _look_ahead_offset = _look_ahead_offset.lerp(desired_ahead, look_ahead_speed * delta)

    # Lerp camera position toward target + look-ahead
    var desired_pos: Vector2 = target.global_position + _look_ahead_offset
    global_position = global_position.lerp(desired_pos, follow_speed * delta)

using Godot;

public partial class SmoothFollowCamera : Camera2D
{
    [Export] public Node2D Target { get; set; }
    [Export] public float FollowSpeed { get; set; } = 8.0f;
    [Export] public float LookAheadDistance { get; set; } = 80.0f;
    [Export] public float LookAheadSpeed { get; set; } = 4.0f;

    private Vector2 _lookAheadOffset = Vector2.Zero;
    private Vector2 _previousTargetPos = Vector2.Zero;

    public override void _Ready()
    {
        PositionSmoothingEnabled = false;
        if (Target != null)
        {
            _previousTargetPos = Target.GlobalPosition;
            GlobalPosition = Target.GlobalPosition;
        }
    }

    public override void _Process(double delta)
    {
        if (Target == null)
            return;

        float dt = (float)delta;

        Vector2 moveDelta = Target.GlobalPosition - _previousTargetPos;
        _previousTargetPos = Target.GlobalPosition;

        Vector2 desiredAhead = moveDelta.Length() > 0.5f
            ? moveDelta.Normalized() * LookAheadDistance
            : Vector2.Zero;

        _lookAheadOffset = _lookAheadOffset.Lerp(desiredAhead, LookAheadSpeed * dt);

        Vector2 desiredPos = Target.GlobalPosition + _lookAheadOffset;
        GlobalPosition = GlobalPosition.Lerp(desiredPos, FollowSpeed * dt);
    }
}

extends Camera2D

## Maximum pixel offset during maximum trauma
@export var max_offset: Vector2 = Vector2(20.0, 15.0)

## Maximum rotation offset in degrees during maximum trauma
@export var max_roll: float = 3.0

## Rate at which trauma decays per second (0–1 range)
@export var decay_rate: float = 1.5

var _trauma: float = 0.0  # 0.0 = no shake, 1.0 = maximum shake

# Optional: use noise for smooth, organic shake
var _noise: FastNoiseLite
var _noise_time: float = 0.0
@export var use_noise: bool = true
@export var noise_speed: float = 60.0

func _ready() -> void:
    _noise = FastNoiseLite.new()
    _noise.noise_type = FastNoiseLite.TYPE_SIMPLEX
    _noise.seed = randi()

## Call this from any node to trigger a shake (amount in 0–1 range; can stack)
func add_trauma(amount: float) -> void:
    _trauma = minf(_trauma + amount, 1.0)

func _process(delta: float) -> void:
    if _trauma <= 0.0:
        offset = Vector2.ZERO
        rotation = 0.0
        return

    # Decay trauma over time
    _trauma = maxf(_trauma - decay_rate * delta, 0.0)
    _noise_time += delta * noise_speed

    var shake: float = _trauma * _trauma  # squaring gives subtle feel at low trauma

    if use_noise:
        offset.x = max_offset.x * shake * _noise.get_noise_2d(_noise_time, 0.0)
        offset.y = max_offset.y * shake * _noise.get_noise_2d(0.0, _noise_time)
        rotation = deg_to_rad(max_roll) * shake * _noise.get_noise_2d(_noise_time, _noise_time)
    else:
        offset.x = max_offset.x * shake * randf_range(-1.0, 1.0)
        offset.y = max_offset.y * shake * randf_range(-1.0, 1.0)
        rotation = deg_to_rad(max_roll) * shake * randf_range(-1.0, 1.0)

# Any node that can reach the camera
func on_explosion() -> void:
    var cam := get_viewport().get_camera_2d() as ScreenShakeCamera
    if cam:
        cam.add_trauma(0.6)

using Godot;

public partial class ScreenShakeCamera : Camera2D
{
    [Export] public Vector2 MaxOffset { get; set; } = new Vector2(20f, 15f);
    [Export] public float MaxRoll { get; set; } = 3.0f;
    [Export] public float DecayRate { get; set; } = 1.5f;
    [Export] public bool UseNoise { get; set; } = true;
    [Export] public float NoiseSpeed { get; set; } = 60.0f;

    private float _trauma = 0f;
    private float _noiseTime = 0f;
    private FastNoiseLite _noise;

    public override void _Ready()
    {
        _noise = new FastNoiseLite();
        _noise.NoiseType = FastNoiseLite.NoiseTypeEnum.Simplex;
        _noise.Seed = (int)GD.Randi();
    }

    public void AddTrauma(float amount)
    {
        _trauma = Mathf.Min(_trauma + amount, 1.0f);
    }

    public override void _Process(double delta)
    {
        if (_trauma <= 0f)
        {
            Offset = Vector2.Zero;
            Rotation = 0f;
            return;
        }

        float dt = (float)delta;
        _trauma = Mathf.Max(_trauma - DecayRate * dt, 0f);
        _noiseTime += dt * NoiseSpeed;

        float shake = _trauma * _trauma;

        if (UseNoise)
        {
            Offset = new Vector2(
                MaxOffset.X * shake * _noise.GetNoise2D(_noiseTime, 0f),
                MaxOffset.Y * shake * _noise.GetNoise2D(0f, _noiseTime)
            );
            Rotation = Mathf.DegToRad(MaxRoll) * shake * _noise.GetNoise2D(_noiseTime, _noiseTime);
        }
        else
        {
            Offset = new Vector2(
                MaxOffset.X * shake * (float)GD.RandRange(-1.0, 1.0),
                MaxOffset.Y * shake * (float)GD.RandRange(-1.0, 1.0)
            );
            Rotation = Mathf.DegToRad(MaxRoll) * shake * (float)GD.RandRange(-1.0, 1.0);
        }
    }
}