text_animation/
text-animation.rs

1use mittens_engine::{engine, utils};
2
3#[path = "example_util/mod.rs"]
4mod example_util;
5
6fn main() {
7    mittens_engine::example_support::ensure_model_assets();
8    utils::logger::init();
9
10    let world = engine::ecs::World::default();
11    let mut universe = engine::Universe::new(world);
12
13    // Input-driven camera rig.
14    // Topology: I { T { C3D } }
15    let input = universe
16        .world
17        .add_component(engine::ecs::component::InputComponent::new().with_speed(1.5));
18    let camera3d = universe
19        .world
20        .add_component(engine::ecs::component::Camera3DComponent::new());
21    let rig_transform = universe.world.add_component(
22        engine::ecs::component::TransformComponent::new().with_position(0.0, 0.0, 2.5),
23    );
24    let input_mode = universe.world.add_component(
25        engine::ecs::component::InputTransformModeComponent::forward_z().with_roll_axis_y(),
26    );
27    let _ = universe.attach(input, input_mode);
28    let _ = universe.attach(input, rig_transform);
29    let _ = universe.attach(rig_transform, camera3d);
30
31    // Small on-screen help.
32    example_util::spawn_desktop_camera_controls_hint(&mut universe, rig_transform);
33    universe.add(input);
34
35    // Light so we can see non-emissive materials.
36    let light_transform = universe.world.add_component(
37        engine::ecs::component::TransformComponent::new().with_position(0.0, 0.0, 2.0),
38    );
39    let light = universe.world.add_component(
40        engine::ecs::component::PointLightComponent::new()
41            .with_distance(25.0)
42            .with_color(1.0, 1.0, 1.0),
43    );
44    let _ = universe.attach(light_transform, light);
45    universe.add(light_transform);
46
47    use engine::ecs::component::{
48        ColorComponent, TextComponent, TextShadowComponent, TextureComponent,
49        TextureFilteringComponent, TransformComponent, TransparentCutoutComponent,
50    };
51
52    // Styled text root.
53    let text_root = universe.world.add_component(
54        TransformComponent::new()
55            .with_position(0.0, 0.0, 0.0)
56            .with_scale(0.25, 0.25, 1.0),
57    );
58
59    // Color must be an ancestor of the glyph renderables.
60    let color_id = universe
61        .world
62        .add_component(ColorComponent::rgba(1.0, 1.0, 1.0, 1.0));
63    let _ = universe.attach(text_root, color_id);
64
65    // This is the component we animate via SetText.
66    let text_id = universe.world.add_component(TextComponent::new(">w<"));
67    let _ = universe.attach(color_id, text_id);
68
69    // Route into cutout pass for cleaner edges.
70    let cutout = universe
71        .world
72        .add_component(TransparentCutoutComponent::new());
73    let _ = universe.attach(text_id, cutout);
74
75    // Font atlas.
76    let tex = universe.world.add_component(TextureComponent::with_uri(
77        "assets/textures/font_system.dds",
78    ));
79    let _ = universe.attach(text_id, tex);
80
81    let shadow = universe.world.add_component(
82        TextShadowComponent::new()
83            .with_scale(1.35)
84            .with_offset([0.06, -0.06, 0.0015]),
85    );
86    let filtering = universe
87        .world
88        .add_component(TextureFilteringComponent::nearest_magnification());
89
90    let _ = universe.attach(text_id, shadow);
91    let _ = universe.attach(text_id, filtering);
92
93    universe.add(text_root);
94
95    let clock_component = universe
96        .world
97        .add_component(engine::ecs::component::ClockComponent::new().with_bpm(140.0));
98    let _ = universe.add(clock_component);
99
100    // Looping animation: 4 beats long, 4 keyframes.
101    let anim = universe
102        .world
103        .add_component(engine::ecs::component::AnimationComponent::new());
104
105    let faces = [">w<", "^w^", "-_-", "o_o"];
106    for (i, &face) in faces.iter().enumerate() {
107        let kf = universe
108            .world
109            .add_component(engine::ecs::component::KeyframeComponent::new(i as f64));
110
111        // Each keyframe emits a SetText intent.
112        let action = universe
113            .world
114            .add_component(engine::ecs::component::ActionComponent::new(
115                engine::ecs::IntentValue::SetText {
116                    component_ids: vec![text_id],
117                    text: face.to_string(),
118                },
119            ));
120
121        let _ = universe.attach(anim, kf);
122        let _ = universe.attach(kf, action);
123    }
124
125    universe.add(anim);
126
127    // Process init-time registrations (Text expands into glyph subtrees here).
128    universe.systems.process_commands(
129        &mut universe.world,
130        &mut universe.visuals,
131        &mut universe.render_assets,
132        &mut universe.command_queue,
133    );
134
135    engine::Windowing::run_app(universe).expect("Windowing failed");
136}
text_animation/text-animation.rs

text_animation/
text-animation.rs
