Initial commit

.editorconfig

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+root = true
+
+[*]
+charset = utf-8

.gitattributes

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+# Normalize EOL for all files that Git considers text files.
+* text=auto eol=lf

.gitignore

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+# Godot 4+ specific ignores
+.godot/
+/android/

Cart/cart.gd

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+extends Node2D
+class_name Cart
+
+@export var spline : Spline 
+
+
+var going = false
+var progress = 0
+
+func _ready():
+	hide()
+
+func _process(delta: float) -> void:
+	if len(spline.curve_points) > 1:
+		position = spline.curve_points[progress]
+		rotation = (spline.curve_points[progress+1] - position).angle()
+
+	if not going:
+		return
+
+	progress += 1
+	if progress >= len(spline.curve_points)-1:
+		going = false
+		hide()
+		progress = 0

Cart/cart.gd.uid

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+uid://jrmwg6neheh5

Cart/cart.tscn

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+[gd_scene format=3 uid="uid://pdmq2mjt8uxg"]
+
+[ext_resource type="Script" uid="uid://jrmwg6neheh5" path="res://Cart/cart.gd" id="1_amo0v"]
+[ext_resource type="Texture2D" uid="uid://xcgu5k1v41tq" path="res://cart.png" id="2_f3qtc"]
+
+[node name="Cart" type="Node2D" unique_id=800624852]
+script = ExtResource("1_amo0v")
+
+[node name="Cart Sprite" type="Sprite2D" parent="." unique_id=1281407851]
+scale = Vector2(0.1, 0.1)
+texture = ExtResource("2_f3qtc")
+offset = Vector2(0, -165)

Splines/spline.gd

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+extends Node2D
+
+class_name Spline
+
+var points : PackedVector2Array
+
+var curve_points : PackedVector2Array

Splines/spline.gd.uid

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+uid://k0tl2g83mr6s

Splines/spline.tscn

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+[gd_scene format=3 uid="uid://cbh3fab2u11vg"]
+
+[ext_resource type="Script" uid="uid://k0tl2g83mr6s" path="res://Splines/spline.gd" id="1_2cbjp"]
+
+[node name="Spline" type="Node2D" unique_id=1036543531]
+script = ExtResource("1_2cbjp")

UI/Spline Editor/control_point.gd

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+extends Button
+
+class_name ControlPoint
+
+var locked : bool = false
+
+func _draw():
+	draw_circle(size/2, 5, Color.DIM_GRAY, true, -1, true)
+	draw_circle(size/2, 5, Color.WHITE, false, 1, true)
+
+func get_represented_position() -> Vector2:
+	return position + size/2
+
+func set_represented_position(new_position : Vector2):
+	position = new_position - size/2
+	
+	var parent = get_parent()
+	if parent != null:
+		parent.update()
+	
+
+func _process(delta: float) -> void:
+	if button_pressed:
+		set_represented_position(get_global_mouse_position())

UI/Spline Editor/control_point.gd.uid

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+uid://bpx1v5s2m4ept

UI/Spline Editor/control_point.tscn

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+[gd_scene format=3 uid="uid://di4jvhvyqtusq"]
+
+[ext_resource type="Script" uid="uid://bpx1v5s2m4ept" path="res://UI/Spline Editor/control_point.gd" id="1_ottbd"]
+
+[node name="Control Point" type="Button" unique_id=1542646560]
+custom_minimum_size = Vector2(10, 10)
+offset_right = 50.0
+offset_bottom = 50.0
+focus_mode = 0
+flat = true
+script = ExtResource("1_ottbd")

UI/Spline Editor/spline_editor.gd

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+extends Control
+
+@export var spline : Spline
+@export var cart : Cart
+@export var control_point_scene : PackedScene
+
+@export var steps : int = 10
+
+var editing = true
+
+func _ready() -> void:
+	pass
+	
+
+func _draw():
+	if editing:
+		for i in range(len(spline.points)-1):
+			draw_line(spline.points[i], spline.points[i+1], Color.DIM_GRAY, 1, true)
+	
+	if len(spline.curve_points) > 2:
+		draw_polyline(spline.curve_points, Color.WHITE, 3, true)
+
+func _process(delta: float) -> void:
+	if not editing:
+		return
+
+	if Input.is_action_just_pressed("add_new_point"):
+		var new_control_point : ControlPoint = control_point_scene.instantiate()
+		new_control_point.set_represented_position(get_global_mouse_position())
+		add_child(new_control_point)
+		update()
+
+func update():
+	spline.points = []
+	for child in get_children():
+		if not child is ControlPoint:
+			continue
+		spline.points.append(child.get_represented_position())
+		
+		spline.curve_points = []
+		for i in range(len(spline.points)-3):
+			var b0 : Vector2 = spline.points[i]
+			var b1 : Vector2 = spline.points[i+1]
+			var b2 : Vector2 = spline.points[i+2]
+			var b3 : Vector2 = spline.points[i+3]
+			
+			var t : float = 0
+			while t < 0.99:
+				# B-spline calculations
+				var calculated_position =\
+					((-b0+3*b1-3*b2+b3)*(t**3) +\
+					(3*b0-6*b1+3*b2)*(t**2) +\
+					(-3*b0+3*b2)*t +\
+					(b0+4*b1+b2))/6
+				spline.curve_points.append(calculated_position)
+				t += 0.1
+		queue_redraw()
+
+
+func _on_check_button_toggled(toggled_on: bool) -> void:
+	editing = toggled_on
+	for child in get_children():
+		if not child is ControlPoint:
+			continue
+		child.visible = editing
+	update()
+
+
+func _on_start_pressed() -> void:
+	cart.going = true
+	cart.show()

UI/Spline Editor/spline_editor.gd.uid

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+uid://dttjp7o66ghn4

UI/Spline Editor/spline_editor.tscn

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+[gd_scene format=3 uid="uid://curwvxlv5wr2s"]
+
+[ext_resource type="Script" uid="uid://dttjp7o66ghn4" path="res://UI/Spline Editor/spline_editor.gd" id="1_ahlr6"]
+[ext_resource type="PackedScene" uid="uid://di4jvhvyqtusq" path="res://UI/Spline Editor/control_point.tscn" id="2_td7mw"]
+
+[sub_resource type="InputEventKey" id="InputEventKey_td7mw"]
+device = -1
+keycode = 69
+unicode = 101
+
+[sub_resource type="Shortcut" id="Shortcut_j0rrm"]
+events = [SubResource("InputEventKey_td7mw")]
+
+[node name="Spline Editor" type="Control" unique_id=1591101939]
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+script = ExtResource("1_ahlr6")
+control_point_scene = ExtResource("2_td7mw")
+
+[node name="HBoxContainer" type="HBoxContainer" parent="." unique_id=836867708]
+layout_mode = 0
+offset_right = 40.0
+offset_bottom = 40.0
+
+[node name="Start" type="Button" parent="HBoxContainer" unique_id=767033586]
+layout_mode = 2
+text = "Start Roller Coaster"
+
+[node name="CheckButton" type="CheckButton" parent="HBoxContainer" unique_id=1422024819]
+layout_mode = 2
+button_pressed = true
+shortcut = SubResource("Shortcut_j0rrm")
+text = "Editing"
+
+[connection signal="pressed" from="HBoxContainer/Start" to="." method="_on_start_pressed"]
+[connection signal="toggled" from="HBoxContainer/CheckButton" to="." method="_on_check_button_toggled"]

cart.png.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://xcgu5k1v41tq"
+path="res://.godot/imported/cart.png-c0d5895155eac46d26ac9947ca1d6fe3.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://cart.png"
+dest_files=["res://.godot/imported/cart.png-c0d5895155eac46d26ac9947ca1d6fe3.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/uastc_level=0
+compress/rdo_quality_loss=0.0
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/channel_remap/red=0
+process/channel_remap/green=1
+process/channel_remap/blue=2
+process/channel_remap/alpha=3
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

icon.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="128" height="128"><rect width="124" height="124" x="2" y="2" fill="#363d52" stroke="#212532" stroke-width="4" rx="14"/><g fill="#fff" transform="translate(12.322 12.322)scale(.101)"><path d="M105 673v33q407 354 814 0v-33z"/><path fill="#478cbf" d="m105 673 152 14q12 1 15 14l4 67 132 10 8-61q2-11 15-15h162q13 4 15 15l8 61 132-10 4-67q3-13 15-14l152-14V427q30-39 56-81-35-59-83-108-43 20-82 47-40-37-88-64 7-51 8-102-59-28-123-42-26 43-46 89-49-7-98 0-20-46-46-89-64 14-123 42 1 51 8 102-48 27-88 64-39-27-82-47-48 49-83 108 26 42 56 81zm0 33v39c0 276 813 276 814 0v-39l-134 12-5 69q-2 10-14 13l-162 11q-12 0-16-11l-10-65H446l-10 65q-4 11-16 11l-162-11q-12-3-14-13l-5-69z"/><path d="M483 600c0 34 58 34 58 0v-86c0-34-58-34-58 0z"/><circle cx="725" cy="526" r="90"/><circle cx="299" cy="526" r="90"/></g><g fill="#414042" transform="translate(12.322 12.322)scale(.101)"><circle cx="307" cy="532" r="60"/><circle cx="717" cy="532" r="60"/></g></svg>

icon.svg.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://dg3obuh047f7w"
+path="res://.godot/imported/icon.svg-218a8f2b3041327d8a5756f3a245f83b.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://icon.svg"
+dest_files=["res://.godot/imported/icon.svg-218a8f2b3041327d8a5756f3a245f83b.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/uastc_level=0
+compress/rdo_quality_loss=0.0
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/channel_remap/red=0
+process/channel_remap/green=1
+process/channel_remap/blue=2
+process/channel_remap/alpha=3
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1
+svg/scale=1.0
+editor/scale_with_editor_scale=false
+editor/convert_colors_with_editor_theme=false

main_scene.tscn

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+[gd_scene format=3 uid="uid://bgwqqwit2n52j"]
+
+[ext_resource type="PackedScene" uid="uid://cbh3fab2u11vg" path="res://Splines/spline.tscn" id="1_2c62f"]
+[ext_resource type="PackedScene" uid="uid://curwvxlv5wr2s" path="res://UI/Spline Editor/spline_editor.tscn" id="2_gyfs4"]
+[ext_resource type="PackedScene" uid="uid://pdmq2mjt8uxg" path="res://Cart/cart.tscn" id="3_gyfs4"]
+
+[node name="Main Scene" type="Node2D" unique_id=1730722189]
+
+[node name="Spline" parent="." unique_id=1036543531 instance=ExtResource("1_2c62f")]
+
+[node name="Spline Editor" parent="." unique_id=1591101939 node_paths=PackedStringArray("spline", "cart") instance=ExtResource("2_gyfs4")]
+spline = NodePath("../Spline")
+cart = NodePath("../Cart")
+
+[node name="Cart" parent="." unique_id=800624852 node_paths=PackedStringArray("spline") instance=ExtResource("3_gyfs4")]
+spline = NodePath("../Spline")

project.godot

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+; Engine configuration file.
+; It's best edited using the editor UI and not directly,
+; since the parameters that go here are not all obvious.
+;
+; Format:
+;   [section] ; section goes between []
+;   param=value ; assign values to parameters
+
+config_version=5
+
+[application]
+
+config/name="Rollercoaster Derivatives"
+run/main_scene="uid://bgwqqwit2n52j"
+config/features=PackedStringArray("4.6", "GL Compatibility")
+config/icon="res://icon.svg"
+
+[display]
+
+window/stretch/mode="canvas_items"
+window/stretch/aspect="expand"
+
+[input]
+
+add_new_point={
+"deadzone": 0.2,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":65,"key_label":0,"unicode":97,"location":0,"echo":false,"script":null)
+]
+}
+
+[physics]
+
+3d/physics_engine="Jolt Physics"
+
+[rendering]
+
+rendering_device/driver.windows="d3d12"
+renderer/rendering_method="gl_compatibility"
+renderer/rendering_method.mobile="gl_compatibility"