/**
    Solid objects. If a ship touches it, then the ship will be instantly destroyed!
*/
class Solid : AbstractRole {

    @Attribute( about="Only show if this.hardness <= Options.hardness" )
    var hardness = 0
    
    override fun begin() {
        if ( this.hardness > Options.instance.hardness ) {
            actor.die()
        } else {
            // We can indicated which rocks are optional by changing their opacity.
            // So set to fully opaque.
            actor.color.alpha = 1
        }
    }

    override fun tick() {
    }
}