mesh_geometry/
point.rs

1//! Point2/Point3 definitions for mesh-geometry.
2
3use core::ops::{Add, Sub};
4use crate::vec::{Vec2, Vec3};
5use crate::Float;
6
7/// A 2D point.
8#[derive(Debug, Clone, Copy, PartialEq)]
9pub struct Point2<T: Float> {
10    /// X coordinate
11    pub x: T,
12    /// Y coordinate
13    pub y: T,
14}
15
16impl<T: Float> Point2<T> {
17    /// Create a new Point2
18    pub fn new(x: T, y: T) -> Self { Self { x, y } }
19}
20
21// vector difference = Vec2
22impl<T: Float> Sub for Point2<T> {
23    type Output = Vec2<T>;
24    fn sub(self, rhs: Point2<T>) -> Vec2<T> {
25        Vec2::new(self.x - rhs.x, self.y - rhs.y)
26    }
27}
28
29// translate point by Vec2
30impl<T: Float> Add<Vec2<T>> for Point2<T> {
31    type Output = Point2<T>;
32    fn add(self, v: Vec2<T>) -> Point2<T> {
33        Point2::new(self.x + v.x, self.y + v.y)
34    }
35}
36
37/// A 3D point.
38#[derive(Debug, Clone, Copy, PartialEq)]
39pub struct Point3<T: Float> {
40    /// X coordinate
41    pub x: T,
42    /// Y coordinate
43    pub y: T,
44    /// Z coordinate
45    pub z: T,
46}
47
48impl<T: Float> Point3<T> {
49    /// Create a new Point3
50    pub fn new(x: T, y: T, z: T) -> Self { Self { x, y, z } }
51}
52
53impl<T: Float> Sub for Point3<T> {
54    type Output = Vec3<T>;
55    fn sub(self, rhs: Point3<T>) -> Vec3<T> {
56        Vec3::new(self.x - rhs.x, self.y - rhs.y, self.z - rhs.z)
57    }
58}
59
60impl<T: Float> Add<Vec3<T>> for Point3<T> {
61    type Output = Point3<T>;
62    fn add(self, v: Vec3<T>) -> Point3<T> {
63        Point3::new(self.x + v.x, self.y + v.y, self.z + v.z)
64    }
65}
66
67#[cfg(test)]
68mod tests {
69    use crate::{Point2, Point3, Vec3};
70
71    #[test]
72    fn roundtrip_point3_vector_ops() {
73        let p = Point3::new(1.0, 2.0, 3.0);
74        let q = Point3::new(4.0, 6.0, 5.0);
75        let v = q - p;
76        // subtraction gives correct Vec3
77        assert_eq!(v, Vec3::new(3.0, 4.0, 2.0));
78        // adding it back recovers q
79        assert_eq!(p + v, q);
80    }
81
82    #[test]
83    fn point2_sub_add_consistency() {
84        let p = Point2::new(0.5, 1.5);
85        let q = Point2::new(-1.0,  4.0);
86        let v = q - p;
87        assert_eq!(p + v, q);
88    }
89}
mesh_geometry/point.rs

mesh_geometry/
point.rs
