Bevy Entity Creation

[bronze wedge]

Hello, I want to learn how the ECS data driven works, and I have done this simple code:

use bevy::prelude::*;

#[derive(Component)]
pub struct Position {
    pub x: f32,
    pub y: f32,
}

#[derive(Component)]
pub struct Velocity {
    pub x: f32,
    pub y: f32,
}

#[derive(Component)]
pub struct Health {
    pub health: i32,
    pub can_loose_health: bool,
}

#[derive(Component)]
pub struct Damage {
    pub damage: i32,
    pub can_be_damage: bool,
}

#[derive(Bundle)]
pub struct EntityBundle {
    pub position: Position,
    pub velocity: Velocity,
    pub health: Health,
    pub damage: Damage,
    pub sprite: Sprite,
}

pub struct EntityPlugin;
impl Plugin for EntityPlugin {
    fn build(&self, app: &mut App) {
        app.add_systems(Startup, create_entities)
            .add_systems(Update, update_movement_by_keyboard);
    }
}

pub fn create_entities(mut commands: Commands, asset_server: Res<AssetServer>)  {
    commands.spawn(EntityBundle {
        position: Position { x: 0.0, y: 0.0 },
        velocity: Velocity { x: 5.0, y: 5.0 },
        health: Health {
            health: 100,
            can_loose_health: true,
        },
        damage: Damage {
            damage: 10,
            can_be_damage: true,
        },
        sprite: Sprite::from_image(
            asset_server.load("Main Characters\\Pink Man\\Idle (32x32).png"),
        ),
    });
}

pub fn update_movement_by_keyboard(
    keyboard_input: Res<ButtonInput<KeyCode>>,
    mut query: Query<(&mut Position, &Velocity)>,
) {
    for (mut position, velocity) in query.iter_mut() {
        if keyboard_input.pressed(KeyCode::KeyW) {
            position.y += velocity.y;
        }
        if keyboard_input.pressed(KeyCode::KeyS) {
            position.y -= velocity.y;
        }
        if keyboard_input.pressed(KeyCode::KeyA) {
            position.x -= velocity.x;
        }
        if keyboard_input.pressed(KeyCode::KeyD) {
            position.x += velocity.x;
        }
    }
}```

the position doesnt work, I'm not sure how to draw the sprites as they are spritesheet ect.. help

[short sphinx]

What do you mean by "the position doesn't work?" Bevy doesn't magically know how to use components you make. There is a built-in Transform component.

[low fern]

maybe worth looking at examples.
one worth a look could be: https://github.com/bevyengine/bevy/blob/main/examples/2d/move_sprite.rs

[bronze wedge]

oh okay now it works using the transform, and how to devide the spritesheet so I can animate it there will be different state for it, and using this I want to make more enimes not only the player but I'm not sure how to do that, as I have the EntityBundle, any logical help?

[short sphinx]

There are numerous examples and crates that you might reference/use. What have you looked at so far?

[bronze wedge]

animation sprite, sprite, move sprite, sprite sheet

but yea, i'm really new to bevy and the ECS

I do love the idea for ECS instead of the boring and ugly OOP approach

[short sphinx]

I'm asking which examples have you looked at, which crates, which tutorials/resources, etc?

[bronze wedge]

oooh, bevy documentation, unofficail bevy documentation and old bevy youtube explain tutorial of how things work

[short sphinx]

I'm asking this because there are examples showing what you want to do.

[bronze wedge]

they using old stuff, but the idea is still great

[bronze wedge]

I have define some components and I want to have 1 player and 5 enimes, the player is moved by user, and the enimes by and AI, they have custom properties, like they can take damage or they can deal damage

[short sphinx]

The examples in the main bevy repo are up to date.

[short sphinx]

Focus on one thing first.

[bronze wedge]

alright, I want to do the sprite sheet animation which I'm looking at the code right now 😄