34 lines
826 B
GDScript
34 lines
826 B
GDScript
extends ScrollDamper
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class_name LinearScrollDamper
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## Friction, not physical.
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## The higher the value, the more obvious the deceleration.
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@export_range(0.001, 10000.0, 0.001, "or_greater", "hide_slider")
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var friction := 4.0:
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set(val):
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friction = max(val, 0.001)
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_factor = pow(10.0, friction) - 1.0
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## Factor to use in formula
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var _factor := 10000.0:
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set(val): _factor = max(val, 0.000000000001)
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func _calculate_velocity_by_time(time: float) -> float:
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if time <= 0.0: return 0.0
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return time * _factor
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func _calculate_time_by_velocity(velocity: float) -> float:
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return abs(velocity) / _factor
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func _calculate_offset_by_time(time: float) -> float:
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time = max(time, 0.0)
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return 1.0/2.0 * _factor * time*time
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func _calculate_time_by_offset(offset: float) -> float:
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return sqrt(abs(offset) * 2.0 / _factor)
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