Exercises

Don't forget to checkout the branch:

git checkout 07-level-loading

Spawn the correct number of asteroids

Spawn all the asteroids in the level

Tips:

Find a random position in the arena
Avoid spawning an asteroid on top of the player
- Find a random position in the arena
- Ensure the distance from the center is more than the radius of the player plus a safe margin

Don't return to the menu on the first collision. Instead, do it when the player doesn't have any live remaining

Tips:

Add the number of lives as a resource at the start of the game
On collision, decrement the number of lives
After a collision, wait for a few seconds before respawning the player
You can move the code spawning the player to a separate function to be able to call it either at game start or on respawn
Decide where to respawn:
- At the game starting point
- At the player last position
- At a random position in the arena
- The respawn point shouldn't have an asteroid or the player would die again immediately
If the number of lives is 0, game over

Let's display some information about the current game:

Tips:

Start a new plugin hud (for heads up display)
Add a system when entering the Game state that will display some text and start a StopWatch
- Add a StopWatch as a resource
- Spawn an entity with a Text component
- Spawn children with a TextSpan component. Text spans make it easy to change the style of the text, or to target a specific part for editing
Add a system that will update the text
- Target the entity with the Text component
- Use the TextWriter system parameter to update the text
- And tick the stopwatch