motion_integrator.gd

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extends RefCounted
 
 
 
 
 
func add_force(body:Dictionary, force:Vector2) -> Dictionary:
    var next = body.duplicate(true)
    next["force"] = next.get("force", Vector2.ZERO) + force
    return next
 
 
 
func apply_impulse(body:Dictionary, impulse:Vector2) -> Dictionary:
    var next = body.duplicate(true)
    if bool(next.get("static", false)):
        return next
    next["velocity"] = next.get("velocity", Vector2.ZERO) + impulse * float(next.get("inv_mass", 0.0))
    return next
 
 
 
func integrate(body:Dictionary, delta:float, gravity:Vector2 = Vector2.ZERO, damping:float = 0.0) -> Dictionary:
    var next = body.duplicate(true)
    if bool(next.get("static", false)):
        next["force"] = Vector2.ZERO
        next["acceleration"] = Vector2.ZERO
        return next
    var inv_mass = float(next.get("inv_mass", 1.0))
    var acceleration = gravity + next.get("force", Vector2.ZERO) * inv_mass
    var velocity = next.get("velocity", Vector2.ZERO) + acceleration * delta
    if damping > 0.0:
        velocity *= max(0.0, 1.0 - damping * delta)
    next["previous_position"] = next.get("position", Vector2.ZERO)
    next["position"] = next.get("position", Vector2.ZERO) + velocity * delta
    next["velocity"] = velocity
    next["acceleration"] = acceleration
    next["force"] = Vector2.ZERO
    return next