simple_camera/
simple_camera.rs

1//! This example is a simple show off about telling the camera resource that it need to follow a specific target.
2//! The camera 2D is a resource of the world and can be accessed at easy.
3
4use lotus_engine::*;
5
6your_game!(
7    WindowConfiguration::default(),
8    setup,
9    update
10);
11
12fn setup(context: &mut Context) {
13    let player: Sprite = Sprite::new("textures/lotus_pink_256x256.png".to_string());
14    let secondary_sprite: Sprite = Sprite::new("textures/lotus_pink_256x256.png".to_string());
15    let shape: Shape = Shape::new(Orientation::Horizontal, GeometryType::Square, Color::by_option(ColorOption::Burgundy));
16    let text: Text = Text::new(
17        &mut context.render_state,
18        Font::new(Fonts::RobotoMono.get_path(), 30.0),
19        Position::new(Vector2::new(0.0, 0.0), Strategy::Pixelated),
20        Color::by_option(ColorOption::Black),
21        "Boiler Plate".to_string()
22    );
23
24    context.commands.spawn(
25        vec![
26            Box::new(player),
27            Box::new(Transform::new(
28                Position::new(Vector2::new(0.0, 0.0), Strategy::Normalized),
29                0.0,
30                Vector2::new(0.25, 0.25)
31            )),
32            Box::new(Velocity::new(Vector2::new(1.0, 1.0)))
33        ]
34    );
35
36    context.commands.spawn(
37        vec![
38            Box::new(secondary_sprite),
39            Box::new(Transform::new(
40                Position::new(Vector2::new(-0.25, 0.0), Strategy::Normalized),
41                0.0,
42                Vector2::new(0.25, 0.25)
43            ))
44        ]
45    );
46
47    context.commands.spawn(
48        vec![
49            Box::new(shape),
50            Box::new(Transform::new(
51                Position::new(Vector2::new(-0.75, 0.0), Strategy::Normalized),
52                0.0,
53                Vector2::new(0.25, 0.25)
54            )),
55            Box::new(Velocity::new(Vector2::new(1.0, 1.0)))
56        ]
57    );
58
59    context.commands.spawn(
60        vec![
61            Box::new(text)
62        ]
63    );
64}
65
66fn update(context: &mut Context) {
67    let keyboard_input: ResourceRef<'_, KeyboardInput> = context.world.get_resource::<KeyboardInput>().unwrap();
68
69    let mut query: Query = Query::new(&context.world).with::<Sprite>().with::<Velocity>();
70    let player_entity: Entity = query.entities_with_components().unwrap().first().unwrap().clone();
71
72    let mut camera2d: ResourceRefMut<'_, Camera2d> = context.world.get_resource_mut::<Camera2d>().unwrap();
73    camera2d.set_target(player_entity);
74
75    let velocity: ComponentRef<'_, Velocity> = context.world.get_entity_component::<Velocity>(&player_entity).unwrap();
76    let mut transform: ComponentRefMut<'_, Transform> = context.world.get_entity_component_mut::<Transform>(&player_entity).unwrap();
77
78    if keyboard_input.is_key_pressed(KeyboardKey::ArrowRight) {
79        let x: f32 = transform.position.x + velocity.x * context.delta;
80        transform.set_position_x(&context.render_state, x);
81    } else if keyboard_input.is_key_pressed(KeyboardKey::ArrowLeft) {
82        let x: f32 = transform.position.x - velocity.x * context.delta;
83        transform.set_position_x(&context.render_state, x);
84    }
85}
simple_camera/simple_camera.rs

simple_camera/
simple_camera.rs
