Implementing Game Statistics - Developing Games With Ruby - page 187

if @explodes
Thread . new do
# ...
Explosion . new( @object_pool , x, y, cause)
# ...
end
# ...
end
end
end

# 12-stats/entities/components/tank_health.rb
class TankHealth < Health
# ...
def after_death (cause)
# ...
Thread . new do
# ...
Explosion . new( @object_pool , x, y, cause)
end
end
end

Now every bit of damage gets accounted for.

Displaying Game Score
Having all the data is useless unless we display it somehow. For this, let's rethink our game
states. Now we have MenuState and PlayState . Both of them can switch one into
another. What if we introduced a PauseState , which would freeze the game and display
the list of all tanks along with their kills. Then MenuState would switch to PlayState ,
and from PlayState you would be able to get to PauseState .

Let's begin by implementing ScoreDisplay , that would print a sorted list of tank kills
along with their names.
12-stats/entities/score_display.rb

1 class ScoreDisplay
2 def initialize (object_pool)
3 tanks = object_pool . objects . select do | o |
4 o . class == Tank
5 end
6 stats = tanks . map( & :input ) . map( & :stats )

stats . sort! do | stat1, stat2 | 7