Progress Report

What You've learned

• Loading sprites and displaying them
  • with the AssetServer::load function
  • by adding the Sprite component
• Defining components
  • With required components to simplify adding related components
  • And using Zero Sized Types as tag components to filter entities in queries
• Handling user input
  • reading the ButtonInput<T> resource
  • for the input KeyCode
• Writing more complex queries, and updating components
  • the With and Without query filters
  • and using &mut to query data mutably

Going Further

The "physics" engine we've done is very basic.

Movement is stopped after collisions happened, it would be better to do "shapecasting" on the AABB, find the point of collision, and stop there:

• Before moving, get the AABB
• Move it to where the player would be after moving
• If it collides with something, find the point where it would stop colliding between the two positions
• Move there instead of the original target

In real life, gravity is not a constant speed downward, it's an acceleration which would increase the speed every unit of time. It should be a force that's applied to the player and modifies its vertical speed.

Depending on the feel you want for your game, you can use a complete physics engine (avian2d or rapier2d) or build your own, tailored to what you want.