Implementing Health And Damage - Developing Games With Ruby - page 104

Implementing Health And Damage

I know you have been waiting for this. We will be implementing health system and most
importantly, damage. Soo we will be ready to blow things up.

To implement this, we need to:

1. Add TankHealth component. Start with 100 health.

2. Render tank health next to tank itself.

3. Inflict damage to tank when it is in explosion zone

4. Render different sprite for dead tank.

5. Cut off player input when tank is dead.

Adding Health Component

If we didn't have Component system in place, it would be way more difficult. Now we just
kick in a new class:
07-damage/entities/components/tank_health.rb

1 class TankHealth < Component
2 attr_accessor :health

3
4 def initialize (object, object_pool)
5 super (object)
6 @object_pool = object_pool
7 @health = 100
8 @health_updated = true
9 @last_damage = Gosu . milliseconds
10 end
11
12 def update
13 update_image
14 end
15
16 def update_image
17 if @health_updated
18 if dead?
19

text = ' ✝ '

font_size = 25 20