examples/reflection/
reflection_world_ser_deser.rs

1use crate::z_ignore_test_common::*;
2
3use flecs_ecs::prelude::*;
4use json::WorldToJsonDesc;
5
6#[derive(Debug, Component)]
7#[flecs(meta)]
8pub struct Position {
9    pub x: f32,
10    pub y: f32,
11}
12
13#[derive(Debug, Component)]
14#[flecs(meta)]
15pub struct Velocity {
16    pub x: f32,
17    pub y: f32,
18}
19
20#[derive(Component)]
21pub struct Move;
22
23// Register components and systems in a module. This excludes them by default
24// from the serialized data, and makes it easier to import across worlds.
25impl Module for Move {
26    fn module(world: &World) {
27        world
28            .system_named::<(&mut Position, &Velocity)>("Move")
29            .each_entity(|e, (pos, vel)| {
30                pos.x += vel.x;
31                pos.y += vel.y;
32
33                println!(
34                    "{} moved to {{x: {}, y: {}}}",
35                    e.path().unwrap_or_default(),
36                    pos.x,
37                    pos.y
38                );
39            });
40    }
41}
42
43/*
44
45int main(int, char *[]) {
46    flecs::world world_a;
47
48    world_a.import<move>();
49
50    world_a.entity("ent_1")
51        .set<Position>({10, 20})
52        .set<Velocity>({1, -1});
53
54    world_a.entity("ent_2")
55        .set<Position>({30, 40})
56        .set<Velocity>({-1, 1});
57
58    // Serialize world to JSON
59    auto json = world_a.to_json();
60    std::cout << json << std::endl << std::endl;
61
62    // Output:
63    // {
64    //     "results": [{
65    //         "ids": [
66    //             ["my_module.Position"],
67    //             ["my_module.Velocity"],
68    //             ["flecs.core.Identifier", "flecs.core.Name"]
69    //         ],
70    //         "entities": ["ent_1", "ent_2"],
71    //         "values": [
72    //             [{
73    //                 "x": 10,
74    //                 "y": 20
75    //             }, {
76    //                 "x": 30,
77    //                 "y": 40
78    //             }],
79    //             [{
80    //                 "x": 1,
81    //                 "y": -1
82    //             }, {
83    //                 "x": -1,
84    //                 "y": 1
85    //             }], 0
86    //         ]
87    //     }]
88    // }
89
90    // Create second world, import same module
91    flecs::world world_b;
92    world_b.import<move>();
93
94    // Deserialize JSON into second world
95    world_b.from_json(json);
96
97    // Run system once for both worlds
98    world_a.progress();
99    std::cout << std::endl;
100    world_b.progress();
101
102    // Output
103    //   ::ent_1 moved to {x: 11, y: 19}
104    //   ::ent_2 moved to {x: 29, y: 41}
105    //
106    //   ::ent_1 moved to {x: 11, y: 19}
107    //   ::ent_2 moved to {x: 29, y: 41}
108}
109
110*/
111
112fn main() {
113    let world_a = World::new();
114
115    world_a.import::<Move>();
116
117    world_a
118        .entity_named("ent_1")
119        .set(Position { x: 10.0, y: 20.0 })
120        .set(Velocity { x: 1.0, y: -1.0 });
121
122    world_a
123        .entity_named("ent_2")
124        .set(Position { x: 30.0, y: 40.0 })
125        .set(Velocity { x: -1.0, y: 1.0 });
126
127    // Serialize world to JSON
128    let json = world_a.to_json_world(None);
129    println!("{json}");
130
131    // Output:
132    // // component info is not included in the Output result, but it's there
133    //  {
134    //      "name": "ent_1",
135    //      "id": 551,
136    //      "components": {
137    //        "examples.reflection.world_ser_deser.Position": {
138    //          "x": 10,
139    //          "y": 20
140    //        },
141    //        "examples.reflection.world_ser_deser.Velocity": {
142    //          "x": 1,
143    //          "y": -1
144    //        },
145    //        "(flecs.core.Identifier,flecs.core.Name)": null
146    //      }
147    //    },
148    //    {
149    //      "name": "ent_2",
150    //      "id": 552,
151    //      "components": {
152    //        "examples.reflection.world_ser_deser.Position": {
153    //          "x": 30,
154    //          "y": 40
155    //        },
156    //        "examples.reflection.world_ser_deser.Velocity": {
157    //          "x": -1,
158    //          "y": 1
159    //        },
160    //        "(flecs.core.Identifier,flecs.core.Name)": null
161    //      }
162    //    }
163
164    // Create second world, import same module
165    let world_b = World::new();
166    world_b.import::<Move>();
167
168    // Deserialize JSON into second world
169    world_b.from_json_world(json.as_str(), None);
170
171    // Run system once for both worlds
172    world_a.progress();
173    println!();
174    world_b.progress();
175
176    // Output
177    //   ::ent_1 moved to {x: 11, y: 19}
178    //   ::ent_2 moved to {x: 29, y: 41}
179    //
180    //   ::ent_1 moved to {x: 11, y: 19}
181    //   ::ent_2 moved to {x: 29, y: 41}
182}
183
184#[cfg(feature = "flecs_nightly_tests")]
185#[test]
186fn test() {
187    let output_capture = OutputCapture::capture().unwrap();
188    main();
189    output_capture.test("reflection_world_ser_deser".to_string());
190}
examples/reflection/reflection_world_ser_deser.rs

examples/reflection/
reflection_world_ser_deser.rs
