Lambat di Tikungan

Pelajaran 14 dari 20 dalam kursus Game Godot: Sirkuit Neon di Coddy.

Mobil lawan melibas tikungan dengan kecepatan penuh, sesuatu yang tidak akan dilakukan pengemudi mana pun. Buat mobil itu mengerem saat melewati tikungan. track.turn_ahead(progress, 70.0) menunjukkan seberapa besar lintasan berbelok dalam 70 piksel berikutnya, dalam radian.

Semakin tajam tikungannya, semakin rendah kecepatan yang dituju, hingga 18 persen lebih rendah. Kemudian mobil itu perlahan menyesuaikan kecepatannya, seperti mobil yang mempercepat dan memperlambat lajunya:

var turn: float = track.turn_ahead(progress, 70.0)
var target := top_speed * (1.0 - clampf(turn / 3.0, 0.0, 0.18))
speed = move_toward(speed, target, 160.0 * delta)
progress += speed * delta

Sekarang mobil lawan mulai dari posisi diam, seperti kamu.

Tantangan

Mudah

Tambahkan var speed := 0.0 ke rival.gd.
Ganti progress += top_speed * delta dengan empat baris di atas.

Coba sendiri

extends Node2D

@export var accel := 260.0
@export var max_speed := 200.0
@export var turn_speed := 3.2
@export var drag := 0.6
@export var grip := 7.0

var velocity := Vector2.ZERO
var boost_time := 0.0
var boost_charge := 0.0
var active := true

@onready var track: Node2D = $"../Track"


func _physics_process(delta: float) -> void:
	var throttle := 0.0
	var steer := 0.0
	if active:
		throttle = Input.get_axis("move_down", "move_up")
		steer = Input.get_axis("move_left", "move_right")
		if Input.is_action_just_pressed("action") and boost_charge >= 1.0:
			boost_charge = 0.0
			boost_time = 1.0
	boost_charge = minf(1.0, boost_charge + delta / 10.0)
	$"../HUD/Boost".scale.x = boost_charge

	var forward := Vector2.RIGHT.rotated(rotation)
	var speed := velocity.dot(forward)
	var top := max_speed
	var grip_now := grip
	if boost_time > 0.0:
		boost_time -= delta
		top = max_speed * 1.3
		velocity += forward * accel * delta
	for pad in get_tree().get_nodes_in_group("boost_pads"):
		if position.distance_to(pad.position) < 22.0:
			boost_time = maxf(boost_time, 0.4)
	for oil in get_tree().get_nodes_in_group("oil"):
		if position.distance_to(oil.position) < 20.0:
			grip_now = grip * 0.12
	if not track.is_on_road(position):
		top = max_speed * 0.45
		velocity *= 1.0 - 2.5 * delta

	if throttle < 0.0 and speed > 10.0:
		velocity += forward * throttle * accel * 1.6 * delta
	else:
		velocity += forward * throttle * accel * delta
	rotation += steer * turn_speed * delta * clampf(absf(speed) / 90.0, 0.0, 1.0) * signf(speed + 0.01)

	var side := forward.orthogonal()
	velocity -= side * velocity.dot(side) * minf(1.0, grip_now * delta)
	velocity *= 1.0 - drag * delta
	if velocity.length() > top:
		velocity = velocity.move_toward(velocity.limit_length(top), accel * 2.0 * delta)
	position += velocity * delta
	$Exhaust.emitting = throttle > 0.0 or boost_time > 0.0
	$Flame.visible = boost_time > 0.0