ecstatic 0.0.2

Statically-typed ECS library
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
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136

use crate::*;

#[derive(Debug, PartialEq)]
pub struct Data {
    x: u32,
}

// `Default` impl that isn't the additive identity.
impl Default for Data {
    fn default() -> Data {
        Data { x: 128 }
    }
}

#[derive(Debug, Default, PartialEq)]
pub struct MoreData {
    y: u32,
}

#[derive(Debug, Default, PartialEq)]
pub struct Void {}

define_world!(
        #[derive(Default)]
        pub world {
            components {
                test1: BasicVecStorage<Data>,
                test2: BasicVecStorage<MoreData>,
                test3: VoidStorage<Void>,
            }
            resources {
                test_resource: String,
            }
        }
    );

#[test]
fn test_world() {
    let mut w = World::default();
    w.new_entity().with(Data { x: 1 }).build();
    w.new_entity().with(Data { x: 1 }).build();
    let md = w
        .new_entity()
        .with(Data { x: 2 })
        .with(MoreData { y: 10 })
        .build();
    w.new_entity().with(Data { x: 3 }).build();
    w.new_entity().with(Data { x: 5 }).build();
    w.new_entity().with(Data { x: 8 }).build();

    #[derive(Default)]
    struct TestSystem {
        total: u32,
        chosen: u32,
    }

    impl<'a> System<'a> for TestSystem {
        type Dependencies = (ReadComponent<'a, Data>, WriteComponent<'a, MoreData>);
        fn run(&'a mut self, (data, mut more_data): Self::Dependencies) {
            self.total = 0;
            self.chosen = 0;
            for item in data.iter() {
                if let Some(d) = item {
                    self.total += d.x;
                }
            }
            for item in more_data.iter_mut() {
                if let Some(d) = item {
                    d.y *= 2;
                }
            }
        }
    }
    let mut system = TestSystem::default();
    w.run_system(&mut system);
    assert_eq!(system.total, 20);
    assert_eq!(
        <World as GetComponent<'_, MoreData>>::get(&w).get(md),
        Some(&MoreData { y: 20 })
    );
}

#[test]
fn test_join() {
    let mut w = World::default();
    w.new_entity().with(Data { x: 1 }).build();
    w.new_entity().with(Data { x: 1 }).build();
    let md = w
        .new_entity()
        .with(Data { x: 2 })
        .with(MoreData { y: 42 })
        .build();
    w.new_entity().with(Data { x: 3 }).build();
    w.new_entity().with(Data { x: 5 }).with(Void {}).build();
    w.new_entity().with(Data { x: 8 }).build();

    #[derive(Default)]
    struct TestSystem {
        total: u32,
        chosen: u32,
    }

    impl<'a> System<'a> for TestSystem {
        type Dependencies = (
            WriteComponent<'a, Data>,
            WriteComponent<'a, MoreData>,
            ReadComponent<'a, Void>,
        );
        fn run(&'a mut self, (data, mut more_data, void): Self::Dependencies) {
            self.total = 0;
            self.chosen = 0;

            (&data,).for_each(|_, (d,)| {
                self.total += d.x;
            });

            (&data, &mut more_data).for_each(|_, (d, md)| {
                md.y *= d.x;
            });

            (&data, &void).for_each(|_, (d, _v)| {
                self.chosen = d.x;
            });
        }
    }

    let mut system = TestSystem::default();
    w.run_system(&mut system);

    assert_eq!(system.total, 20);
    assert_eq!(
        <World as GetComponent<'_, MoreData>>::get(&w).get(md),
        Some(&MoreData { y: 84 })
    );
    assert_eq!(system.chosen, 5);
}