twors 0.4.0

A simple Rust 2D game engine based on canvas and WASM
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
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157

//! Represents a 2D point in space.

use std::ops::{Add, AddAssign, Div, DivAssign, Mul, MulAssign, Sub, SubAssign};

#[derive(Debug, PartialEq, Copy, Clone, Default)]
pub struct Vertex2<T> {
    pub x: T,
    pub y: T,
}

impl<T> Vertex2<T> {
    pub const fn new(x: T, y: T) -> Self {
        Self { x, y }
    }
}

macro_rules! bin_op_impl {
    ($trait:ident, $method:ident, $op:tt, $lhs:ty, $rhs:ty) => {
        impl<T> $trait<$rhs> for $lhs
        where
            T: $trait<Output = T> + Copy,
        {
            type Output = Vertex2<T>;

            fn $method(self, rhs: $rhs) -> Self::Output {
                Self::Output {
                    x: self.x $op rhs.x,
                    y: self.y $op rhs.y,
                }
            }
        }
    };
}

macro_rules! bin_op_with_ref_impl {
    ($trait:ident, $method:ident, $op:tt, $ty:ty) => {
        bin_op_impl!($trait, $method, $op, $ty, $ty);
        bin_op_impl!($trait, $method, $op, $ty, &$ty);
        bin_op_impl!($trait, $method, $op, $ty, &mut $ty);

        bin_op_impl!($trait, $method, $op, &$ty, $ty);
        bin_op_impl!($trait, $method, $op, &$ty, &$ty);
        bin_op_impl!($trait, $method, $op, &$ty, &mut $ty);

        bin_op_impl!($trait, $method, $op, &mut $ty, $ty);
        bin_op_impl!($trait, $method, $op, &mut $ty, &$ty);
        bin_op_impl!($trait, $method, $op, &mut $ty, &mut $ty);
    };
}

bin_op_with_ref_impl!(Add, add, +, Vertex2<T>);
bin_op_with_ref_impl!(Sub, sub, -, Vertex2<T>);
bin_op_with_ref_impl!(Mul, mul, *, Vertex2<T>);
bin_op_with_ref_impl!(Div, div, /, Vertex2<T>);

macro_rules! bin_op_assign_impl {
    ($trait:ident, $method:ident, $op:tt, $lhs:ty, $rhs:ty) => {
        impl<T> $trait<$rhs> for $lhs
        where
            T: $trait + Copy,
        {
            fn $method(&mut self, rhs: $rhs) {
                self.x $op rhs.x;
                self.y $op rhs.y;
            }
        }
    };
}

macro_rules! bin_op_assign_with_ref_impl {
    ($trait:ident, $method:ident, $op:tt, $ty:ty) => {
        bin_op_assign_impl!($trait, $method, $op, $ty, $ty);
        bin_op_assign_impl!($trait, $method, $op, $ty, &$ty);
        bin_op_assign_impl!($trait, $method, $op, $ty, &mut $ty);

        bin_op_assign_impl!($trait, $method, $op, &mut $ty, $ty);
        bin_op_assign_impl!($trait, $method, $op, &mut $ty, &$ty);
        bin_op_assign_impl!($trait, $method, $op, &mut $ty, &mut $ty);
    };
}

bin_op_assign_with_ref_impl!(AddAssign, add_assign, +=, Vertex2<T>);
bin_op_assign_with_ref_impl!(SubAssign, sub_assign, -=, Vertex2<T>);
bin_op_assign_with_ref_impl!(MulAssign, mul_assign, *=, Vertex2<T>);
bin_op_assign_with_ref_impl!(DivAssign, div_assign, /=, Vertex2<T>);

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn new() {
        let vertex = Vertex2::new(1.0, 2.0);
        assert_eq!(vertex.x, 1.0);
        assert_eq!(vertex.y, 2.0);
    }

    #[test]
    fn add() {
        let vertex = Vertex2::new(1.5, 2.0) + Vertex2::new(2.0, 3.0);
        assert_eq!(vertex.x, 3.5);
        assert_eq!(vertex.y, 5.0);
    }

    #[test]
    fn sub() {
        let vertex = Vertex2::new(1.5, 2.0) - Vertex2::new(2.0, 3.0);
        assert_eq!(vertex.x, -0.5);
        assert_eq!(vertex.y, -1.0);
    }

    #[test]
    fn mul() {
        let vertex = Vertex2::new(1.5, 2.0) * Vertex2::new(2.0, 3.0);
        assert_eq!(vertex.x, 3.0);
        assert_eq!(vertex.y, 6.0);
    }

    #[test]
    fn div() {
        let vertex = Vertex2::new(1.0, 2.0) / Vertex2::new(2.0, 4.0);
        assert_eq!(vertex.x, 0.5);
        assert_eq!(vertex.y, 0.5);
    }

    #[test]
    fn add_assign() {
        let mut vertex = Vertex2::new(1.0, 2.0);
        vertex += Vertex2::new(3.0, 4.0);
        assert_eq!(vertex.x, 4.0);
        assert_eq!(vertex.y, 6.0);
    }

    #[test]
    fn sub_assign() {
        let mut vertex = Vertex2::new(1.0, 2.0);
        vertex -= Vertex2::new(3.0, 1.0);
        assert_eq!(vertex.x, -2.0);
        assert_eq!(vertex.y, 1.0);
    }

    #[test]
    fn mul_assign() {
        let mut vertex = Vertex2::new(2.0, 4.0);
        vertex *= Vertex2::new(3.0, 3.0);
        assert_eq!(vertex.x, 6.0);
        assert_eq!(vertex.y, 12.0);
    }

    #[test]
    fn div_assign() {
        let mut vertex = Vertex2::new(2.0, 10.0);
        vertex /= Vertex2::new(4.0, 5.0);
        assert_eq!(vertex.x, 0.5);
        assert_eq!(vertex.y, 2.0);
    }
}