Struct tetra::Context

pub struct Context { /* fields omitted */ }

A struct containing all of the ‘global’ state within the framework.

Implementations

impl Context

pub fn run<S, F, E>(&mut self, init: F) -> Result<(), E> where
    S: State<E>,
    F: FnOnce(&mut Context) -> Result<S, E>,
    E: From<TetraError>, 

Runs the game.

The init parameter takes a function or closure that creates a State implementation. A common pattern is to use method references to pass in your state’s constructor directly - see the example below for how this works.

The error type returned by your init closure currently must match the error type returned by your State methods. This limitation may be lifted in the future.

Errors

If the State returns an error from update, draw or event, the game will stop running and this method will return the error.

Examples

use tetra::{Context, ContextBuilder, State};

struct GameState;

impl GameState {
    fn new(ctx: &mut Context) -> tetra::Result<GameState> {
        Ok(GameState)
    }
}

impl State for GameState { }

fn main() -> tetra::Result {
    // Because GameState::new takes `&mut Context` and returns a `State` implementation
    // wrapped in a `Result`, you can use it without a closure wrapper:
    ContextBuilder::new("Hello, world!", 1280, 720)
        .build()?
        .run(GameState::new)
}