1 use std::ops::{Add, AddAssign, Sub, SubAssign, Mul, MulAssign, Div, DivAssign, Neg};
5 ( $x:expr, $y:expr ) => {
6 Point2D { x: $x, y: $y }
10 #[derive(Debug, Default, Copy, Clone, PartialEq)]
11 pub struct Point2D<T> {
17 pub fn length(&self) -> f64 {
18 ((self.x * self.x) + (self.y * self.y)).sqrt()
21 pub fn normalize(&self) -> Self {
22 let l = self.length();
29 pub fn radians(&self) -> Radians {
30 Radians(self.y.atan2(self.x))
33 pub fn degrees(&self) -> Degrees {
34 self.radians().to_degrees()
37 pub fn to_i32(self) -> Point2D<i32> {
45 macro_rules! point_op {
46 ($op:tt, $trait:ident($fn:ident), $trait_assign:ident($fn_assign:ident), $rhs:ident = $Rhs:ty => $x:expr, $y:expr) => {
47 impl<T: $trait<Output = T>> $trait<$Rhs> for Point2D<T> {
50 fn $fn(self, $rhs: $Rhs) -> Self {
58 impl<T: $trait<Output = T> + Copy> $trait_assign<$Rhs> for Point2D<T> {
59 fn $fn_assign(&mut self, $rhs: $Rhs) {
69 point_op!(+, Add(add), AddAssign(add_assign), rhs = Point2D<T> => rhs.x, rhs.y);
70 point_op!(-, Sub(sub), SubAssign(sub_assign), rhs = Point2D<T> => rhs.x, rhs.y);
71 point_op!(*, Mul(mul), MulAssign(mul_assign), rhs = Point2D<T> => rhs.x, rhs.y);
72 point_op!(/, Div(div), DivAssign(div_assign), rhs = Point2D<T> => rhs.x, rhs.y);
73 point_op!(+, Add(add), AddAssign(add_assign), rhs = (T, T) => rhs.0, rhs.1);
74 point_op!(-, Sub(sub), SubAssign(sub_assign), rhs = (T, T) => rhs.0, rhs.1);
75 point_op!(*, Mul(mul), MulAssign(mul_assign), rhs = (T, T) => rhs.0, rhs.1);
76 point_op!(/, Div(div), DivAssign(div_assign), rhs = (T, T) => rhs.0, rhs.1);
78 ////////// multiply point with scalar //////////////////////////////////////////
79 impl<T: Mul<Output = T> + Copy> Mul<T> for Point2D<T> {
82 fn mul(self, rhs: T) -> Self {
90 impl<T: Mul<Output = T> + Copy> MulAssign<T> for Point2D<T> {
91 fn mul_assign(&mut self, rhs: T) {
99 ////////// divide point with scalar ////////////////////////////////////////////
100 impl<T: Div<Output = T> + Copy> Div<T> for Point2D<T> {
103 fn div(self, rhs: T) -> Self {
111 impl<T: Div<Output = T> + Copy> DivAssign<T> for Point2D<T> {
112 fn div_assign(&mut self, rhs: T) {
120 impl<T: Neg<Output = T>> Neg for Point2D<T> {
123 fn neg(self) -> Self {
131 impl<T> From<(T, T)> for Point2D<T> {
132 fn from(item: (T, T)) -> Self {
140 impl<T> From<Point2D<T>> for (T, T) {
141 fn from(item: Point2D<T>) -> Self {
146 impl From<Degrees> for Point2D<f64> {
147 fn from(item: Degrees) -> Self {
149 x: (item.0 * std::f64::consts::PI / 180.0).cos(),
150 y: (item.0 * std::f64::consts::PI / 180.0).sin(),
155 impl From<Radians> for Point2D<f64> {
156 fn from(item: Radians) -> Self {
164 #[derive(Debug, Default, PartialEq, Clone, Copy)]
165 pub struct Degrees(pub f64);
166 #[derive(Debug, Default, PartialEq, Clone, Copy)]
167 pub struct Radians(pub f64);
171 fn to_radians(&self) -> Radians {
172 Radians(self.0 * std::f64::consts::PI / 180.0)
178 fn to_degrees(&self) -> Degrees {
179 Degrees(self.0 * 180.0 * std::f64::consts::FRAC_1_PI)
185 ( $x:expr, $y:expr ) => {
186 Rect { x: $x, y: $y }
196 impl<T: Mul<Output = T> + Copy> Rect<T> {
198 pub fn area(&self) -> T {
199 self.width * self.height
203 impl<T> From<(T, T)> for Rect<T> {
204 fn from(item: (T, T)) -> Self {
213 macro_rules! hashmap {
214 ($($k:expr => $v:expr),*) => {
216 let mut map = std::collections::HashMap::new();
217 $(map.insert($k, $v);)*
228 fn immutable_copy_of_point() {
229 let a = point!(0, 0);
230 let mut b = a; // Copy
231 assert_eq!(a, b); // PartialEq
233 assert_ne!(a, b); // PartialEq
238 let mut a = point!(1, 0);
239 assert_eq!(a + point!(2, 2), point!(3, 2)); // Add
240 a += point!(2, 2); // AddAssign
241 assert_eq!(a, point!(3, 2));
242 assert_eq!(point!(1, 0) + (2, 3), point!(3, 3));
247 let mut a = point!(1, 0);
248 assert_eq!(a - point!(2, 2), point!(-1, -2));
250 assert_eq!(a, point!(-1, -2));
251 assert_eq!(point!(1, 0) - (2, 3), point!(-1, -3));
256 let mut a = point!(1, 2);
257 assert_eq!(a * 2, point!(2, 4));
258 assert_eq!(a * point!(2, 3), point!(2, 6));
260 assert_eq!(a, point!(2, 4));
262 assert_eq!(a, point!(6, 4));
263 assert_eq!(point!(1, 0) * (2, 3), point!(2, 0));
268 let mut a = point!(4, 8);
269 assert_eq!(a / 2, point!(2, 4));
270 assert_eq!(a / point!(2, 4), point!(2, 2));
272 assert_eq!(a, point!(2, 4));
274 assert_eq!(a, point!(1, 1));
275 assert_eq!(point!(6, 3) / (2, 3), point!(3, 1));
280 assert_eq!(point!(1, 1), -point!(-1, -1));
285 assert_eq!(Radians(0.0).to_degrees(), Degrees(0.0));
286 assert_eq!(Radians(std::f64::consts::PI).to_degrees(), Degrees(180.0));
287 assert_eq!(Degrees(180.0).to_radians(), Radians(std::f64::consts::PI));
288 assert!((Point2D::from(Degrees(90.0)) - point!(0.0, 1.0)).length() < 0.001);
289 assert!((Point2D::from(Radians(std::f64::consts::FRAC_PI_2)) - point!(0.0, 1.0)).length() < 0.001);
293 fn area_for_rect_of_multipliable_type() {
294 let r: Rect<_> = (30, 20).into(); // the Into trait uses the From trait
295 assert_eq!(r.area(), 30 * 20);
296 // let a = Rect::from(("a".to_string(), "b".to_string())).area(); // this doesn't work, because area() is not implemented for String