mirror of
https://github.com/bevyengine/bevy
synced 2024-11-23 13:13:49 +00:00
1ba7429371
# Objective Provide a starting point for #3951, or a partial solution. Providing a few comment blocks to discuss, and hopefully find better one in the process. ## Solution Since I am pretty new to pretty much anything in this context, I figured I'd just start with a draft for some file level doc blocks. For some of them I found more relevant details (or at least things I considered interessting), for some others there is less. ## Changelog - Moved some existing comments from main() functions in the 2d examples to the file header level - Wrote some more comment blocks for most other 2d examples TODO: - [x] 2d/sprite_sheet, wasnt able to come up with something good yet - [x] all other example groups... Also: Please let me know if the commit style is okay, or to verbose. I could certainly squash these things, or add more details if needed. I also hope its okay to raise this PR this early, with just a few files changed. Took me long enough and I dont wanted to let it go to waste because I lost motivation to do the whole thing. Additionally I am somewhat uncertain over the style and contents of the commets. So let me know what you thing please.
47 lines
1.6 KiB
Rust
47 lines
1.6 KiB
Rust
//! Shows how anonymous functions / closures can be used as systems.
|
|
|
|
use bevy::{log::LogPlugin, prelude::*};
|
|
|
|
fn main() {
|
|
// create a simple closure.
|
|
let simple_closure = || {
|
|
// this is a closure that does nothing.
|
|
info!("Hello from a simple closure!");
|
|
};
|
|
|
|
// create a closure, with an 'input' value.
|
|
let complex_closure = |mut value: String| {
|
|
move || {
|
|
info!("Hello from a complex closure! {:?}", value);
|
|
|
|
// we can modify the value inside the closure. this will be saved between calls.
|
|
value = format!("{} - updated", value);
|
|
|
|
// you could also use an outside variable like presented in the inlined closures
|
|
// info!("outside_variable! {:?}", outside_variable);
|
|
}
|
|
};
|
|
|
|
let outside_variable = "bar".to_string();
|
|
|
|
App::new()
|
|
.add_plugin(LogPlugin)
|
|
// we can use a closure as a system
|
|
.add_system(simple_closure)
|
|
// or we can use a more complex closure, and pass an argument to initialize a Local variable.
|
|
.add_system(complex_closure("foo".into()))
|
|
// we can also inline a closure
|
|
.add_system(|| {
|
|
info!("Hello from an inlined closure!");
|
|
})
|
|
// or use variables outside a closure
|
|
.add_system(move || {
|
|
info!(
|
|
"Hello from an inlined closure that captured the 'outside_variable'! {:?}",
|
|
outside_variable
|
|
);
|
|
// you can use outside_variable, or any other variables inside this closure.
|
|
// their states will be saved.
|
|
})
|
|
.run();
|
|
}
|