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//! Demonstrates the creation and registration of a custom plugin.
//!
//! Plugins are the foundation of Bevy. They are scoped sets of components, resources, and systems
//! that provide a specific piece of functionality (generally the smaller the scope, the better).
//! This example illustrates how to create a simple plugin that prints out a message.
use bevy::{prelude::*, utils::Duration};
fn main() {
App::new()
// plugins are registered as part of the "app building" process
.add_plugins((
DefaultPlugins,
PrintMessagePlugin {
wait_duration: Duration::from_secs(1),
message: "This is an example plugin".to_string(),
},
))
.run();
}
// This "print message plugin" prints a `message` every `wait_duration`
struct PrintMessagePlugin {
// Put your plugin configuration here
wait_duration: Duration,
message: String,
}
impl Plugin for PrintMessagePlugin {
// this is where we set up our plugin
fn build(&self, app: &mut App) {
let state = PrintMessageState {
message: self.message.clone(),
timer: Timer::new(self.wait_duration, TimerMode::Repeating),
};
app.insert_resource(state)
.add_systems(Update, print_message_system);
}
}
#[derive(Resource)]
struct PrintMessageState {
message: String,
timer: Timer,
}
fn print_message_system(mut state: ResMut<PrintMessageState>, time: Res<Time>) {
if state.timer.tick(time.delta()).finished() {
info!("{}", state.message);
}
}