78 lines
1.8 KiB
GDScript
78 lines
1.8 KiB
GDScript
extends Control
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@export var spline : Spline
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@export var cart : Cart
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@export var control_point_scene : PackedScene
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@onready var check_button : CheckButton = $HBoxContainer/CheckButton
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@export var steps : int = 100
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var editing = true
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func _ready() -> void:
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pass
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func _draw():
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if editing:
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for i in range(len(spline.points)-1):
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draw_line(spline.points[i], spline.points[i+1], Color.DIM_GRAY, 1, true)
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if len(spline.curve_points) > 2:
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draw_polyline(spline.curve_points, Color.WHITE, 3, true)
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func _process(delta: float) -> void:
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if not editing:
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return
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if Input.is_action_just_pressed("add_new_point"):
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var new_control_point : ControlPoint = control_point_scene.instantiate()
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new_control_point.set_represented_position(get_global_mouse_position())
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add_child(new_control_point)
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update()
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func update():
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spline.points = []
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for child in get_children():
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if not child is ControlPoint:
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continue
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spline.points.append(child.get_represented_position())
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spline.curve_points = []
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for i in range(len(spline.points)-3):
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var b0 : Vector2 = spline.points[i]
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var b1 : Vector2 = spline.points[i+1]
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var b2 : Vector2 = spline.points[i+2]
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var b3 : Vector2 = spline.points[i+3]
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var t : float = 0
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while t < 1:
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# B-spline calculations
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var calculated_position =\
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((-b0+3*b1-3*b2+b3)*(t**3) +\
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(3*b0-6*b1+3*b2)*(t**2) +\
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(-3*b0+3*b2)*t +\
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(b0+4*b1+b2))/6
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spline.curve_points.append(calculated_position)
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t += 1.0/steps
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queue_redraw()
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func set_editing(toggled_on: bool):
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editing = toggled_on
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for child in get_children():
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if not child is ControlPoint:
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continue
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child.visible = editing
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check_button.button_pressed = toggled_on
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update()
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func _on_check_button_toggled(toggled_on: bool) -> void:
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set_editing(toggled_on)
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func _on_start_pressed() -> void:
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set_editing(false)
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cart.start()
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