Exercises

Don't forget to checkout the branch:

git checkout 08-player-actions

Let's review what was changed: https://github.com/vleue/bevy_workshop-rustweek-2025/compare/07-level-loading..08-player-actions

Idiomatic Ship Collision Detection

Now we can remove the collision system, and check for asteroid collisions on our ship with an observer!

Tips:

• Remove the existing collision system from the Update schedule
• Add the CollisionEventsEnabled component to the ship entity
• Change the previous collision system to be an observer that will trigger on Trigger<OnCollisionStart>

Can Destroy Asteroids

To destroy asteroid, we need to be able to fire lasers!

Tips:

• New action to fire lasers
• New sprite for lasers
• Spawn a laser when the action is fired
  • With a Sprite
  • With a RigidBody
  • With a Collider
  • With a LinearVelocity
  • With CollisionEventsEnabled
• Despawn lasers after a certain time
• Observe collisions between asteroids and lasers
• Despawn asteroid and laser when they collide

Detect when all Asteroids are Destroyed

Switch to a win screen when all asteroids are destroyed

Tips:

• Add a new state GameState::Won
• Copy the menu and change the text and all the states used
• Add a system with a query on asteroids
• When there are no asteroids anymore, change state