43 lines
1.3 KiB
GDScript
43 lines
1.3 KiB
GDScript
extends Node2D
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var point
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var isSliding=false
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var currentTrail:Line2D
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const STARTALPHA=0.5
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const MAXIMUM_POINTS=100 #maximum points per trail
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const FADETIME=120 #in seconds. how long a trail should last (if alpha would start at 1.0)
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func _ready() -> void:
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pass
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func _physics_process(delta: float) -> void:
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if isSliding:
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point = global_position
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currentTrail.add_point(point)
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if currentTrail.points.size()>MAXIMUM_POINTS:
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currentTrail.remove_point(0) #remove points from start
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for c:Line2D in get_children():
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c.default_color.a=max(c.default_color.a-1.0/FADETIME*delta,0.0)
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if c.default_color.a<=0: #not visible anymore
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c.queue_free()
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func setSliding(psliding:bool):
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if not isSliding and psliding: #just started sliding
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#Create new Line
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currentTrail=Line2D.new()
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add_child(currentTrail)
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currentTrail.width=4
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currentTrail.default_color=Color(0,0,0,STARTALPHA)
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var curve=Curve.new()
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curve.add_point(Vector2(0,0),0,5,Curve.TANGENT_FREE,Curve.TANGENT_FREE)
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curve.add_point(Vector2(0.5,1),0,0,Curve.TANGENT_FREE,Curve.TANGENT_FREE)
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curve.add_point(Vector2(1,0),-5,0,Curve.TANGENT_FREE,Curve.TANGENT_FREE)
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currentTrail.width_curve=curve
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currentTrail.set_as_top_level(true) #position is global position
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currentTrail.z_index=8 #above road, behind car
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isSliding=psliding
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