| 1 | use std::ops::{Add, AddAssign, Sub, SubAssign, Mul, MulAssign, Div, DivAssign, Neg}; |
| 2 | |
| 3 | pub type Nanoseconds = u64; |
| 4 | |
| 5 | #[macro_export] |
| 6 | macro_rules! point { |
| 7 | ( $x:expr, $y:expr ) => { |
| 8 | Point2D { x: $x, y: $y } |
| 9 | }; |
| 10 | } |
| 11 | |
| 12 | #[derive(Debug, Default, Copy, Clone, PartialEq)] |
| 13 | pub struct Point2D<T> { |
| 14 | pub x: T, |
| 15 | pub y: T, |
| 16 | } |
| 17 | |
| 18 | impl Point2D<f64> { |
| 19 | pub fn length(self) -> f64 { |
| 20 | ((self.x * self.x) + (self.y * self.y)).sqrt() |
| 21 | } |
| 22 | } |
| 23 | |
| 24 | ////////// add point to point ////////////////////////////////////////////////// |
| 25 | impl<T: Add<Output = T>> Add for Point2D<T> { |
| 26 | type Output = Self; |
| 27 | |
| 28 | fn add(self, rhs: Self) -> Self { |
| 29 | Self { |
| 30 | x: self.x + rhs.x, |
| 31 | y: self.y + rhs.y, |
| 32 | } |
| 33 | } |
| 34 | } |
| 35 | |
| 36 | impl<T: Add<Output = T> + Copy> AddAssign for Point2D<T> { |
| 37 | fn add_assign(&mut self, rhs: Self) { |
| 38 | *self = Self { |
| 39 | x: self.x + rhs.x, |
| 40 | y: self.y + rhs.y, |
| 41 | } |
| 42 | } |
| 43 | } |
| 44 | |
| 45 | ////////// add tuple to point ////////////////////////////////////////////////// |
| 46 | impl<T: Add<Output = T>> Add<(T, T)> for Point2D<T> { |
| 47 | type Output = Self; |
| 48 | |
| 49 | fn add(self, rhs: (T, T)) -> Self { |
| 50 | Self { |
| 51 | x: self.x + rhs.0, |
| 52 | y: self.y + rhs.1, |
| 53 | } |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | ////////// subtract point from point /////////////////////////////////////////// |
| 58 | impl<T: Sub<Output = T>> Sub for Point2D<T> { |
| 59 | type Output = Self; |
| 60 | |
| 61 | fn sub(self, rhs: Self) -> Self { |
| 62 | Self { |
| 63 | x: self.x - rhs.x, |
| 64 | y: self.y - rhs.y, |
| 65 | } |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | impl<T: Sub<Output = T> + Copy> SubAssign for Point2D<T> { |
| 70 | fn sub_assign(&mut self, rhs: Self) { |
| 71 | *self = Self { |
| 72 | x: self.x - rhs.x, |
| 73 | y: self.y - rhs.y, |
| 74 | } |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | ////////// multiply point with scalar ////////////////////////////////////////// |
| 79 | impl<T: Mul<Output = T> + Copy> Mul<T> for Point2D<T> { |
| 80 | type Output = Self; |
| 81 | |
| 82 | fn mul(self, rhs: T) -> Self { |
| 83 | Self { |
| 84 | x: self.x * rhs, |
| 85 | y: self.y * rhs, |
| 86 | } |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | impl<T: Mul<Output = T> + Copy> MulAssign<T> for Point2D<T> { |
| 91 | fn mul_assign(&mut self, rhs: T) { |
| 92 | *self = Self { |
| 93 | x: self.x * rhs, |
| 94 | y: self.y * rhs, |
| 95 | } |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | ////////// multiply components of two points /////////////////////////////////// |
| 100 | impl<T: Mul<Output = T>> Mul for Point2D<T> { |
| 101 | type Output = Self; |
| 102 | |
| 103 | fn mul(self, rhs: Self) -> Self { |
| 104 | Self { |
| 105 | x: self.x * rhs.x, |
| 106 | y: self.y * rhs.y, |
| 107 | } |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | impl<T: Mul<Output = T> + Copy> MulAssign for Point2D<T> { |
| 112 | fn mul_assign(&mut self, rhs: Self) { |
| 113 | *self = Self { |
| 114 | x: self.x * rhs.x, |
| 115 | y: self.y * rhs.y, |
| 116 | } |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | ////////// divide point with scalar //////////////////////////////////////////// |
| 121 | impl<T: Div<Output = T> + Copy> Div<T> for Point2D<T> { |
| 122 | type Output = Self; |
| 123 | |
| 124 | fn div(self, rhs: T) -> Self { |
| 125 | Self { |
| 126 | x: self.x / rhs, |
| 127 | y: self.y / rhs, |
| 128 | } |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | impl<T: Div<Output = T> + Copy> DivAssign<T> for Point2D<T> { |
| 133 | fn div_assign(&mut self, rhs: T) { |
| 134 | *self = Self { |
| 135 | x: self.x / rhs, |
| 136 | y: self.y / rhs, |
| 137 | } |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | ////////// divide components of two points ///////////////////////////////////// |
| 142 | impl<T: Div<Output = T>> Div for Point2D<T> { |
| 143 | type Output = Self; |
| 144 | |
| 145 | fn div(self, rhs: Self) -> Self { |
| 146 | Self { |
| 147 | x: self.x / rhs.x, |
| 148 | y: self.y / rhs.y, |
| 149 | } |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | impl<T: Div<Output = T> + Copy> DivAssign for Point2D<T> { |
| 154 | fn div_assign(&mut self, rhs: Self) { |
| 155 | *self = Self { |
| 156 | x: self.x / rhs.x, |
| 157 | y: self.y / rhs.y, |
| 158 | } |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | impl<T: Neg<Output = T>> Neg for Point2D<T> { |
| 163 | type Output = Self; |
| 164 | |
| 165 | fn neg(self) -> Self { |
| 166 | Self { |
| 167 | x: -self.x, |
| 168 | y: -self.y, |
| 169 | } |
| 170 | } |
| 171 | } |
| 172 | |
| 173 | impl<T> From<(T, T)> for Point2D<T> { |
| 174 | fn from(item: (T, T)) -> Self { |
| 175 | Point2D { |
| 176 | x: item.0, |
| 177 | y: item.1, |
| 178 | } |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | #[macro_export] |
| 183 | macro_rules! rect { |
| 184 | ( $x:expr, $y:expr ) => { |
| 185 | Rect { x: $x, y: $y } |
| 186 | }; |
| 187 | } |
| 188 | |
| 189 | #[derive(Default)] |
| 190 | pub struct Rect<T> { |
| 191 | pub width: T, |
| 192 | pub height: T, |
| 193 | } |
| 194 | |
| 195 | impl<T: Mul<Output = T> + Copy> Rect<T> { |
| 196 | #[allow(dead_code)] |
| 197 | pub fn area(&self) -> T { |
| 198 | self.width * self.height |
| 199 | } |
| 200 | } |
| 201 | |
| 202 | impl<T> From<(T, T)> for Rect<T> { |
| 203 | fn from(item: (T, T)) -> Self { |
| 204 | Rect { |
| 205 | width: item.0, |
| 206 | height: item.1, |
| 207 | } |
| 208 | } |
| 209 | } |
| 210 | |
| 211 | #[cfg(test)] |
| 212 | mod tests { |
| 213 | use super::*; |
| 214 | |
| 215 | #[test] |
| 216 | fn immutable_copy_of_point() { |
| 217 | let a = point!(0, 0); |
| 218 | let mut b = a; // Copy |
| 219 | assert_eq!(a, b); // PartialEq |
| 220 | b.x = 1; |
| 221 | assert_ne!(a, b); // PartialEq |
| 222 | } |
| 223 | |
| 224 | #[test] |
| 225 | fn add_points() { |
| 226 | let mut a = point!(1, 0); |
| 227 | assert_eq!(a + point!(2, 2), point!(3, 2)); // Add |
| 228 | a += point!(2, 2); // AddAssign |
| 229 | assert_eq!(a, point!(3, 2)); |
| 230 | assert_eq!(point!(1, 0) + (2, 3), point!(3, 3)); |
| 231 | } |
| 232 | |
| 233 | #[test] |
| 234 | fn sub_points() { |
| 235 | let mut a = point!(1, 0); |
| 236 | assert_eq!(a - point!(2, 2), point!(-1, -2)); |
| 237 | a -= point!(2, 2); |
| 238 | assert_eq!(a, point!(-1, -2)); |
| 239 | } |
| 240 | |
| 241 | #[test] |
| 242 | fn mul_points() { |
| 243 | let mut a = point!(1, 2); |
| 244 | assert_eq!(a * 2, point!(2, 4)); |
| 245 | assert_eq!(a * point!(2, 3), point!(2, 6)); |
| 246 | a *= 2; |
| 247 | assert_eq!(a, point!(2, 4)); |
| 248 | a *= point!(3, 1); |
| 249 | assert_eq!(a, point!(6, 4)); |
| 250 | } |
| 251 | |
| 252 | #[test] |
| 253 | fn div_points() { |
| 254 | let mut a = point!(4, 8); |
| 255 | assert_eq!(a / 2, point!(2, 4)); |
| 256 | assert_eq!(a / point!(2, 4), point!(2, 2)); |
| 257 | a /= 2; |
| 258 | assert_eq!(a, point!(2, 4)); |
| 259 | a /= point!(2, 4); |
| 260 | assert_eq!(a, point!(1, 1)); |
| 261 | } |
| 262 | |
| 263 | #[test] |
| 264 | fn neg_point() { |
| 265 | assert_eq!(point!(1, 1), -point!(-1, -1)); |
| 266 | } |
| 267 | |
| 268 | #[test] |
| 269 | fn area_for_rect_of_multipliable_type() { |
| 270 | let r: Rect<_> = (30, 20).into(); // the Into trait uses the From trait |
| 271 | assert_eq!(r.area(), 30 * 20); |
| 272 | // let a = Rect::from(("a".to_string(), "b".to_string())).area(); // this doesn't work, because area() is not implemented for String |
| 273 | } |
| 274 | } |