Hands-on Rust

Adding Monsters

Monsters have a lot in common with the player. They have a position and render information. They aren’t keyboard controlled and they shouldn’t have a Player tag. Instead, monsters need an Enemy tag component. Open components.rs, and add an Enemy tag:

EntitiesComponentsAndSystems/dungeonecs/src/components.rs

#[derive(Clone, Copy, Debug, PartialEq)]
pub struct Enemy;

An empty structure is all that’s required for a tag class. You still need a way to spawn monsters. Open spawner.rs, and add a spawn_monster function. It’s very similar to the player spawning code:

EntitiesComponentsAndSystems/dungeonecs/src/spawner.rs

pub fn spawn_monster(
    ecs: &mut World,
    rng: &mut RandomNumberGenerator,
    pos : Point
) {