Merge branch 'fishin'

1 files changed, 55 insertions, 0 deletions

diff --git a/libs/shake_pivot.gd b/libs/shake_pivot.gd
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+class_name ShakePivot
+extends Node2D
+## Shakes on command. Use this node as the parent of a sprite or a camera to make it shake!
+## Adapted from https://shaggydev.com/2022/02/23/screen-shake-godot/.
+
+## How quickly to move through the noise.
+@export var NOISE_SHAKE_SPEED: float = 20.0
+## How much to multiply the noise values (which are in the range (-1, 1)) by.
+@export var NOISE_SHAKE_STRENGTH: float = 15.0
+## Multiplier for lerping the shake strength to zero.
+@export var SHAKE_DECAY_RATE: float = 10.0
+
+## Object that creates random noise to make for a nice shaking motion.
+@onready var _noise := FastNoiseLite.new()
+
+## Used to keep track of where we are in the noise so we can smoothly move through it.
+var noise_i: float = 0.0
+## Value taken from the noise to calculate the shaking node's position.
+var shake_strength: float = 0.0
+
+
+# Called when the node enters the scene tree for the first time.
+func _ready() -> void:
+	# Set noise type to simplex, since the tutorial I'm copying (uh I mean taking inspiration from)
+	# is for an older version of Godot that had a dedicated simplex noise class
+	_noise.noise_type = FastNoiseLite.TYPE_SIMPLEX
+	# Randomize the generated noise
+	_noise.seed = randi()
+	# Period affects how quickly the noise changes values
+	_noise.frequency = 0.5
+
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+func _process(delta: float) -> void:
+	# Fade out the intensity over time
+	shake_strength = lerp(shake_strength, 0.0, SHAKE_DECAY_RATE * delta)
+	
+	# Shake by adjusting position so we can move the object around
+	position = get_noise_offset(delta)
+
+
+## Uses noise to generate a random 2D vector
+func get_noise_offset(delta: float) -> Vector2:
+	noise_i += delta * NOISE_SHAKE_SPEED
+	# Set the x values of each call to 'get_noise_2d' to a different value so that our x and y 
+	# vectors will read from unrelated areas of noise
+	return Vector2(
+		_noise.get_noise_2d(1, noise_i) * shake_strength,
+		_noise.get_noise_2d(100, noise_i) * shake_strength
+	)
+
+
+## Sets the strength to its initial value.
+func shake() -> void:
+	shake_strength = NOISE_SHAKE_STRENGTH