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#144 in Game dev
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SLoC
Dark Iron ECS
Features
- Entity Creation: Easily create entities and attach components to them.
- Event Handling: Implement event-driven architecture with custom events and event handlers.
- Coroutines: Create a coroutine to be executed at specific intervals or delays.
- Queries: Efficiently query entities based on their components.
- Systems: Implement game logic and behaviors through systems that process entities based on queries.
- Extensions: Extend the functionality of the ECS with custom extensions.
- Chained Building: World could be create by a chain of methods.
Example
Demonstrates how to use the dark_iron_ecs
library to create an Entity Component System (ECS) in Rust. The example includes creating components, querying entities, and setting up systems to interact with those components.
Setup
First, add the dark_iron_ecs
dependency to your Cargo.toml
:
[dependencies]
dark_iron_ecs = "*" # Replace with the actual version
Imports
For this example the necessary imports:
use dark_iron_ecs::core::{
coroutine::{Coroutine, CoroutineState, WaitAmountOfSeconds},
entity_manager::EntityManager,
extension::Extension,
query::{Query, Without},
resources::Resource,
system::SystemSchedule,
world::World,
};
Components
Define your components. Components are data associated with entities.
struct Position {
x: f32,
y: f32,
}
struct Name(String);
struct Health(i32);
Systems
Define systems to operate on entities that have specific components. Systems are functions that process entities.
fn test_system(q: Query<(&Health,)>, entity_manager: &mut EntityManager) {
entity_manager.create_entity((Health(500),));
for health in q.fetch() {
println!("{:?}", health.0);
}
}
fn test_system_1(
q: Query<(&Health,)>,
q2: Query<(&Health,), Without<(&Name,)>>,
mut camera: Resource<Camera>,
) {
for health in q.fetch() {
println!("q {:?}", health.0);
}
for health in q2.fetch() {
println!("q2 {:?}", health.0);
}
println!("Hello from test_system_1");
camera.x += 1.0;
println!("{:?} {:?} {:?}", camera.x, camera.y, camera.z);
}
Events
Define events that can be published and subscribed to within the world.
struct CollisionEvent;
Resources
Define resources that are globally accessible by systems.
struct Camera {
x: f32,
y: f32,
z: f32,
}
Extension
Define easy extensions to your world.
pub struct ExtensionExample;
impl Extension for ExtensionExample {
fn build(&self, world: &mut World) {
world.create_entity((Health(100),));
}
}
Main Function
Set up the world, create entities, add systems, and run the ECS.
use dark_iron_ecs::core::{
coroutine::{Coroutine, CoroutineState, WaitAmountOfSeconds},
entity_manager::EntityManager,
query::{Query, Without},
resources::Resource,
system::SystemSchedule,
world::World,
};
fn main() {
let mut world = World::new();
let entity1 = world.create_entity_with_id((Health(100),));
let entity2 = world.create_entity_with_id((Name("Enemy 2".to_string()), Health(200)));
let entity3 = world.create_entity_with_id((
Position { x: 0.0, y: 0.0 },
Name("Enemy 3".to_string()),
Health(300),
));
if let Some(health) = entity1.get_component::<Health>(&world){
println!("Component {:?}", health.0);
}
let mut counter = 10;
world
.create_entity((Velocity(0.0, 0.0),))
.subscribe_event(|_world: &World, _t: CollisionEvent| {
println!("Collision Event Hit");
})
.remove_component::<Health>(entity3)
.add_component_to_entity(entity3, Health(400))
.add_coroutine(Coroutine::new("Test Coroutine", move |world| {
if counter == 10 {
println!("Coroutine Started");
}
counter -= 1;
if counter == 0 {
println!("Coroutine Finished");
world.remove_entity(entity3);
world.create_entity((Health(900),));
world.add_component_to_entity(entity1, Name("Player".to_string()));
world.remove_component::<Health>(entity2);
world.publish_event(CollisionEvent);
return CoroutineState::Finished;
}
println!("Coroutine Running");
CoroutineState::Yielded(WaitAmountOfSeconds {
amount_in_seconds: 1.0,
})
}))
.add_resource(Camera {
x: 1000.0,
y: 0.0,
z: 0.0,
})
.add_system(SystemSchedule::Startup, test_system)
.add_systems(SystemSchedule::Update, (test_system_1,))
.run_startup()
.add_extension(ExtensionExample)
.build();
let q = world.create_query::<&Health>();
let q1 = world.create_query_with_constraint::<&Health, Without<&Name>>();
for health in q.fetch() {
println!("{:?}", health.0);
}
for health in q1.fetch() {
println!("{:?}", health.0);
}
loop {
world.run_update();
world.update_coroutines(1.0);
std::thread::sleep(std::time::Duration::from_secs(1));
}
}
Running the Project
To run the project, use Cargo:
cargo run
This will compile and run your ECS example, demonstrating how to create and manage entities, components, systems, events, and resources using the dark_iron_ecs library.
License
This project is licensed under the MIT License. See the LICENSE file for details.
MIT License
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.