rusty_engine 1.1.3

Learn Rust with a simple, cross-platform, 2D game engine.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42

use std::f32::consts::TAU;

use rusty_engine::prelude::*;

fn main() {
    let mut game = Game::new();
    let _ = game.add_actor("Race Car", ActorPreset::RacingCarGreen);

    // Use a timer to tell when to change state
    game.game_state_mut()
        .timer_map
        .insert("change_state".into(), Timer::from_seconds(1.0, true));
    // Are we turning?
    game.game_state_mut()
        .bool_map
        .insert("turning".into(), false);

    game.run(logic);
}

fn logic(game_state: &mut GameState) {
    // Get mutable references to the variables in the game state that we care about
    let race_car = game_state.actors.get_mut("Race Car").unwrap();
    let turning = game_state.bool_map.get_mut("turning").unwrap();
    let timer = game_state.timer_map.get_mut("change_state").unwrap();

    // If we aren't turning, then tick the timer until it's time to start turning again
    if !*turning && timer.tick(game_state.delta).just_finished() {
        *turning = true;
    }

    // Rotate the player
    if *turning {
        race_car.rotation += game_state.delta_seconds * 3.0;
        // If the player rotated all the way around, reset direction, stop turning
        // TAU == (2 * PI), which is exactly one rotation in radians
        if race_car.rotation > TAU {
            race_car.rotation = 0.0;
            *turning = false;
        }
    }
}