From e7ca0c8c641a25b72dd7063dfddb301490feda49 Mon Sep 17 00:00:00 2001
From: Fisch <interfisch@gmx.net>
Date: Sun, 10 Nov 2024 20:49:52 +0100
Subject: [PATCH] add tire trails

---
 scenes/car.tscn        | 13 ++++++++++++-
 scenes/tire_trail.tscn | 14 ++++++++++++++
 scripts/car.gd         | 12 +++++++-----
 scripts/tiretrail.gd   | 23 +++++++++++++++++++++++
 4 files changed, 56 insertions(+), 6 deletions(-)
 create mode 100644 scenes/tire_trail.tscn
 create mode 100644 scripts/tiretrail.gd

diff --git a/scenes/car.tscn b/scenes/car.tscn
index 5ba4396..6840523 100644
--- a/scenes/car.tscn
+++ b/scenes/car.tscn
@@ -1,9 +1,10 @@
-[gd_scene load_steps=47 format=3 uid="uid://0g7qqh7naniv"]
+[gd_scene load_steps=48 format=3 uid="uid://0g7qqh7naniv"]
 
 [ext_resource type="Script" path="res://scripts/car_node.gd" id="1_0tin3"]
 [ext_resource type="Script" path="res://scripts/car.gd" id="1_i5tet"]
 [ext_resource type="Texture2D" uid="uid://mqdujngircok" path="res://sprites/car_features.png" id="3_ts6mm"]
 [ext_resource type="Texture2D" uid="uid://e5aeyl47wi8p" path="res://sprites/car_body.png" id="4_lps13"]
+[ext_resource type="PackedScene" uid="uid://c3fdxjrpcgnnp" path="res://scenes/tire_trail.tscn" id="5_2bgdv"]
 [ext_resource type="Script" path="res://scripts/label_round.gd" id="5_vheit"]
 [ext_resource type="PackedScene" uid="uid://dl7r8s5sxyvlw" path="res://scenes/enginesound.tscn" id="6_v21se"]
 [ext_resource type="AudioStream" uid="uid://dq5rei2w1isu4" path="res://sounds/crash/Car_Crash_01.mp3" id="7_7erwn"]
@@ -148,6 +149,16 @@ texture = ExtResource("4_lps13")
 rotation = -1.57079
 shape = SubResource("CapsuleShape2D_bj1hp")
 
+[node name="PositionFrontLeftTire" type="Node2D" parent="CharacterBody_Car"]
+position = Vector2(10, -7)
+
+[node name="Trail" parent="CharacterBody_Car/PositionFrontLeftTire" instance=ExtResource("5_2bgdv")]
+
+[node name="PositionFrontRightTire" type="Node2D" parent="CharacterBody_Car"]
+position = Vector2(10, 7)
+
+[node name="Trail" parent="CharacterBody_Car/PositionFrontRightTire" instance=ExtResource("5_2bgdv")]
+
 [node name="RayCast_FL" type="RayCast2D" parent="CharacterBody_Car"]
 target_position = Vector2(256, -128)
 collision_mask = 2
diff --git a/scenes/tire_trail.tscn b/scenes/tire_trail.tscn
new file mode 100644
index 0000000..cbb1ec9
--- /dev/null
+++ b/scenes/tire_trail.tscn
@@ -0,0 +1,14 @@
+[gd_scene load_steps=3 format=3 uid="uid://c3fdxjrpcgnnp"]
+
+[ext_resource type="Script" path="res://scripts/tiretrail.gd" id="1_cvwoe"]
+
+[sub_resource type="Curve" id="Curve_ckg0w"]
+_data = [Vector2(0, 0), 0.0, 3.77363, 0, 0, Vector2(1, 0), -4.04783, 0.0, 0, 0]
+point_count = 2
+
+[node name="Trail" type="Line2D"]
+z_index = 9
+width = 4.0
+width_curve = SubResource("Curve_ckg0w")
+default_color = Color(0, 0, 0, 1)
+script = ExtResource("1_cvwoe")
diff --git a/scripts/car.gd b/scripts/car.gd
index c52e5d0..5e123af 100644
--- a/scripts/car.gd
+++ b/scripts/car.gd
@@ -202,7 +202,7 @@ func get_input(delta:float):
 		if steer_direction<1:
 			resetcar_steerangle=min(-resetcar_steerangle,+resetcar_steerangle) #calculate steering direction for next autoreset
 		
-var mind=1
+
 func calculate_steering(delta:float):
 	var rear_wheel = position - transform.x *wheel_base/2.0
 	var front_wheel = position + transform.x *wheel_base/2.0
@@ -218,12 +218,14 @@ func calculate_steering(delta:float):
 	var d = new_heading.dot(velocity.normalized())
 	
 	if d > 0:
-		mind=min(d,mind)
-		if d==mind:
-			print("mind="+str(mind))
 		velocity = velocity.lerp(new_heading * velocity.length(), traction)
-		if d<0.80 and velocity.length()>slip_speed and applied_engine_power>engine_power/2:
+		if d<0.82 and velocity.length()>slip_speed and applied_engine_power>engine_power/2:
 			sfx.sliding(velocity.length())
+			$PositionFrontLeftTire/Trail.setSliding(true)
+			$PositionFrontRightTire/Trail.setSliding(true)
+		elif d>0.98: #keep trails a bit longer
+			$PositionFrontLeftTire/Trail.setSliding(false)
+			$PositionFrontRightTire/Trail.setSliding(false)
 			
 	elif d<0:
 		velocity = - new_heading * min(velocity.length(),max_speed_reverse)
diff --git a/scripts/tiretrail.gd b/scripts/tiretrail.gd
new file mode 100644
index 0000000..9b36977
--- /dev/null
+++ b/scripts/tiretrail.gd
@@ -0,0 +1,23 @@
+extends Line2D
+
+var point
+var isSliding=false
+# Called when the node enters the scene tree for the first time.
+func _ready() -> void:
+	set_as_top_level(true)
+
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+func _physics_process(delta):
+	pass
+func _process(delta: float) -> void:
+	if isSliding:
+		point = get_parent().global_position
+		add_point(point)
+		if points.size()>100:
+			remove_point(0)
+
+func setSliding(psliding:bool):
+	if not isSliding and psliding: #just started sliding
+		clear_points()
+	isSliding=psliding