virtual_dpad.rs

use bevy::prelude::*;
use leafwing_input_manager::prelude::*;

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        // This plugin maps inputs to an input-type agnostic action-state
        // We need to provide it with an enum which stores the possible actions a player could take
        .add_plugin(InputManagerPlugin::<Action>::default())
        // Spawn an entity with Player, InputMap, and ActionState components
        .add_startup_system(spawn_player)
        // Read the ActionState in your systems using queries!
        .add_system(move_player)
        .run();
}

#[derive(Actionlike, PartialEq, Eq, Clone, Copy, Hash, Debug)]
enum Action {
    Move,
}

#[derive(Component)]
struct Player;

fn spawn_player(mut commands: Commands) {
    commands
        .spawn(InputManagerBundle::<Action> {
            // Stores "which actions are currently activated"
            // Map some arbitrary keys into a virtual direction pad that triggers our move action
            input_map: InputMap::new([(
                VirtualDPad {
                    up: KeyCode::W.into(),
                    down: KeyCode::S.into(),
                    left: KeyCode::A.into(),
                    right: KeyCode::D.into(),
                },
                Action::Move,
            )])
            .build(),
            ..default()
        })
        .insert(Player);
}

// Query for the `ActionState` component in your game logic systems!
fn move_player(query: Query<&ActionState<Action>, With<Player>>) {
    let action_state = query.single();
    // If any button in a virtual direction pad is pressed, then the action state is "pressed"
    if action_state.pressed(Action::Move) {
        // Virtual direction pads are one of the types which return an AxisPair. The values will be
        // represented as `-1.0`, `0.0`, or `1.0` depending on the combination of buttons pressed.
        let axis_pair = action_state.axis_pair(Action::Move).unwrap();
        println!("Move:");
        println!("   distance: {}", axis_pair.length());
        println!("          x: {}", axis_pair.x());
        println!("          y: {}", axis_pair.y());
    }
}