boxdd 0.2.0

Safe, ergonomic Rust bindings for Box2D v3
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
158
159
160
161
162
163
164
165
166
167
168
169
170

use boxdd_sys::ffi;

/// A simple 2D vector in meters.
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
#[repr(C)]
#[derive(Copy, Clone, Debug, Default, PartialEq)]
pub struct Vec2 {
    pub x: f32,
    pub y: f32,
}

#[cfg(feature = "bytemuck")]
unsafe impl bytemuck::Zeroable for Vec2 {}
#[cfg(feature = "bytemuck")]
unsafe impl bytemuck::Pod for Vec2 {}

#[cfg(feature = "bytemuck")]
const _: () = {
    assert!(core::mem::size_of::<Vec2>() == 8);
    assert!(core::mem::align_of::<Vec2>() == 4);
};

impl Vec2 {
    pub const ZERO: Self = Self { x: 0.0, y: 0.0 };
    pub const fn new(x: f32, y: f32) -> Self {
        Self { x, y }
    }
}

impl From<ffi::b2Vec2> for Vec2 {
    #[inline]
    fn from(v: ffi::b2Vec2) -> Self {
        Self { x: v.x, y: v.y }
    }
}

impl From<Vec2> for ffi::b2Vec2 {
    #[inline]
    fn from(v: Vec2) -> Self {
        ffi::b2Vec2 { x: v.x, y: v.y }
    }
}

// Conversions from common 2D types to Vec2 for ergonomic APIs
impl From<[f32; 2]> for Vec2 {
    #[inline]
    fn from(a: [f32; 2]) -> Self {
        Self { x: a[0], y: a[1] }
    }
}
impl From<(f32, f32)> for Vec2 {
    #[inline]
    fn from(t: (f32, f32)) -> Self {
        Self { x: t.0, y: t.1 }
    }
}

#[cfg(feature = "mint")]
impl From<mint::Vector2<f32>> for Vec2 {
    #[inline]
    fn from(v: mint::Vector2<f32>) -> Self {
        Self { x: v.x, y: v.y }
    }
}
#[cfg(feature = "mint")]
impl From<mint::Point2<f32>> for Vec2 {
    #[inline]
    fn from(p: mint::Point2<f32>) -> Self {
        Self { x: p.x, y: p.y }
    }
}

#[cfg(feature = "mint")]
impl From<Vec2> for mint::Vector2<f32> {
    #[inline]
    fn from(v: Vec2) -> Self {
        Self { x: v.x, y: v.y }
    }
}

#[cfg(feature = "mint")]
impl From<Vec2> for mint::Point2<f32> {
    #[inline]
    fn from(v: Vec2) -> Self {
        Self { x: v.x, y: v.y }
    }
}

// Optional conversions with common math libraries
#[cfg(feature = "cgmath")]
impl From<cgmath::Vector2<f32>> for Vec2 {
    #[inline]
    fn from(v: cgmath::Vector2<f32>) -> Self {
        Self { x: v.x, y: v.y }
    }
}
#[cfg(feature = "cgmath")]
impl From<Vec2> for cgmath::Vector2<f32> {
    #[inline]
    fn from(v: Vec2) -> Self {
        cgmath::Vector2 { x: v.x, y: v.y }
    }
}
#[cfg(feature = "cgmath")]
impl From<cgmath::Point2<f32>> for Vec2 {
    #[inline]
    fn from(p: cgmath::Point2<f32>) -> Self {
        Self { x: p.x, y: p.y }
    }
}
#[cfg(feature = "cgmath")]
impl From<Vec2> for cgmath::Point2<f32> {
    #[inline]
    fn from(v: Vec2) -> Self {
        cgmath::Point2 { x: v.x, y: v.y }
    }
}

#[cfg(feature = "nalgebra")]
impl From<nalgebra::Vector2<f32>> for Vec2 {
    #[inline]
    fn from(v: nalgebra::Vector2<f32>) -> Self {
        Self { x: v.x, y: v.y }
    }
}
#[cfg(feature = "nalgebra")]
impl From<Vec2> for nalgebra::Vector2<f32> {
    #[inline]
    fn from(v: Vec2) -> Self {
        nalgebra::Vector2::new(v.x, v.y)
    }
}
#[cfg(feature = "nalgebra")]
impl From<nalgebra::Point2<f32>> for Vec2 {
    #[inline]
    fn from(p: nalgebra::Point2<f32>) -> Self {
        Self { x: p.x, y: p.y }
    }
}
#[cfg(feature = "nalgebra")]
impl From<Vec2> for nalgebra::Point2<f32> {
    #[inline]
    fn from(v: Vec2) -> Self {
        nalgebra::Point2::new(v.x, v.y)
    }
}

#[cfg(feature = "glam")]
impl From<glam::Vec2> for Vec2 {
    #[inline]
    fn from(v: glam::Vec2) -> Self {
        Self { x: v.x, y: v.y }
    }
}
#[cfg(feature = "glam")]
impl From<Vec2> for glam::Vec2 {
    #[inline]
    fn from(v: Vec2) -> Self {
        glam::Vec2::new(v.x, v.y)
    }
}

// Public id aliases to avoid exposing `ffi::` in user-facing API/docstrings.
pub type BodyId = ffi::b2BodyId;
pub type ShapeId = ffi::b2ShapeId;
pub type JointId = ffi::b2JointId;
pub type ChainId = ffi::b2ChainId;

/// Mass properties (mass, center, inertia) used by Box2D.
pub type MassData = ffi::b2MassData;