/**
    Ejected from the Ship when it thrusts.
*/
class Puff : ActionRole {

    var ship: Ship
    
    fun begin( ship : Ship ) {
        this.ship = ship
        
        actor.direction = ship.actor.direction
        actor.moveForwards( 5 - ship.actor.appearance.height()/2)

        actor.direction =  Angle.degrees( Rand.between( -20.0, 20.0 ) + ship.actor.direction.degrees + 180 )
        val distance = actor.direction.vector() * Rand.between( 60, 100 )
        distance += ship.velocity
        val seconds = 1.0
        val action = MoveBy( actor.position, seconds, distance ).and(Fade( actor.color, seconds, 0)).then( Kill( actor ) )

        actor.stage = ship.actor.stage
        actor.zOrder = ship.actor.zOrder -1

        then( action )
    }

}