Tools for dealing with angles in GDScript

angle_lerping.gd

# Useful functions for calculating distances between angles

static func lerp_angle(from: float, to: float, weight: float) -> float:
    return from + short_angle_dist(from, to) * weight

static func short_angle_dist(from: float, to: float) -> float:
    var difference = fmod(to - from, PI * 2)
    return fmod(2 * difference, PI * 2) - difference

# A chunk of code I came up with for more snappy angle lerping
# The 'boost' will increase lerp speed when lerping over longer distances,
# e.g. when trying to turn 180 degrees.
# Make sure you define ROTATE_LERP_SPEED and ROTATE_LERP_SPEED_BOOST
# Also, make sure to replace FROM_ANGLE with your base angle, and TO_ANGLE
# with the angle you want to lerp towards.
# For my player, I used a lerp speed of 0.07, and a speed boost of 0.1

func _process(delta: float) -> void:
    var angle = TO_ANGLE
    var boost = abs(Utils.short_angle_dist(FROM_ANGLE, angle)) * ROTATE_LERP_SPEED_BOOST
    rotation = wrapf(Utils.lerp_angle(FROM_ANGLE, angle, ROTATE_LERP_SPEED + boost), -PI, PI)