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//! CH Modules - Movement
//!
//! CH Movement provides a set of systems for driving Entity movement.
//!
//! # Included
//!
//! - **Velocity**: Represents the entity's current momentum, used by systems to calculate the next frame's translation
//! - **Movement**: A pure marker, used to flag this entity as movable
//! - **VelocityReducer**: Controls how Velocity is reduced
//!
//! Movement is applied to the entity's [`Transform::translation`].
#![deny(missing_docs)]
use bevy::{
app::{FixedUpdate, Plugin},
ecs::{query::With, system::Query},
transform::components::Transform,
};
use ch_macro_rules::import;
// Basic data
import!(velocity, movement);
// Modifiers
import!(reducer);
/// Cigarette Hacker movement plugin
///
/// Used to describe the movement of characters in the game
pub struct CHMovementPlugins;
impl Plugin for CHMovementPlugins {
fn build(&self, app: &mut bevy::app::App) {
app.add_systems(FixedUpdate, update_movement);
}
}
fn update_movement(
query: Query<(&mut Transform, &mut Velocity, Option<&VelocityReducer>), With<Movement>>,
) {
for (mut transform, mut velo, reducer) in query {
// Add Velocity to the entity's translation
transform.translation += **velo;
// Apply velocity reduction (default to Lerp(0.25) if no reducer present)
match reducer {
Some(reducer) => reducer.calculate(&mut velo),
None => VelocityReducer::Lerp(0.25).calculate(&mut velo),
}
}
}
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