/**
    Adds a bit of Christmas spirit.
    Creates snow flakes, which are governed by the physics engine.
    The initial Y position of the snow is the same as this.
    The X position is between this.actor.x and [toX].
*/
class SnowMachine : ActionRole() {

    @Attribute( about="The maximum X value  for the generated snow flakes" )
    var toX = 1280

    @Attribute( about="How quickly snow flakes are generated (units per second) " )
    var period = 0.2

    @Attribute( about="Total number of snow flakes to create" )
    var count = 200


    override fun createAction(): Action {
        return ( Delay(period) thenOnce this:>createSnow ).repeat( count )
    }

    fun createSnow() {
        val snowA = actor.createChild("snow")
        snowA.x = Rand.between(actor.x, toX)
        snowA.y = actor.y
    }

}