| 1 | use std::ops::{Add, AddAssign, Sub, SubAssign, Mul, MulAssign, Div, DivAssign, Neg}; |
| 2 | |
| 3 | #[macro_export] |
| 4 | macro_rules! point { |
| 5 | ( $x:expr, $y:expr ) => { |
| 6 | Point { x: $x, y: $y } |
| 7 | }; |
| 8 | } |
| 9 | |
| 10 | #[derive(Debug, Default, Copy, Clone, PartialEq)] |
| 11 | pub struct Point<T> { |
| 12 | pub x: T, |
| 13 | pub y: T, |
| 14 | } |
| 15 | |
| 16 | impl Point<f64> { |
| 17 | pub fn length(&self) -> f64 { |
| 18 | ((self.x * self.x) + (self.y * self.y)).sqrt() |
| 19 | } |
| 20 | |
| 21 | pub fn normalized(&self) -> Self { |
| 22 | let l = self.length(); |
| 23 | Self { |
| 24 | x: self.x / l, |
| 25 | y: self.y / l, |
| 26 | } |
| 27 | } |
| 28 | |
| 29 | pub fn to_radians(&self) -> Radians { |
| 30 | Radians(self.y.atan2(self.x)) |
| 31 | } |
| 32 | |
| 33 | pub fn to_degrees(&self) -> Degrees { |
| 34 | self.to_radians().to_degrees() |
| 35 | } |
| 36 | |
| 37 | pub fn to_i32(self) -> Point<i32> { |
| 38 | Point { |
| 39 | x: self.x as i32, |
| 40 | y: self.y as i32, |
| 41 | } |
| 42 | } |
| 43 | } |
| 44 | |
| 45 | macro_rules! point_op { |
| 46 | ($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 Point<T> { |
| 48 | type Output = Self; |
| 49 | |
| 50 | fn $fn(self, $rhs: $Rhs) -> Self { |
| 51 | Self { |
| 52 | x: self.x $op $x, |
| 53 | y: self.y $op $y, |
| 54 | } |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | impl<T: $trait<Output = T> + Copy> $trait_assign<$Rhs> for Point<T> { |
| 59 | fn $fn_assign(&mut self, $rhs: $Rhs) { |
| 60 | *self = Self { |
| 61 | x: self.x $op $x, |
| 62 | y: self.y $op $y, |
| 63 | } |
| 64 | } |
| 65 | } |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | point_op!(+, Add(add), AddAssign(add_assign), rhs = Point<T> => rhs.x, rhs.y); |
| 70 | point_op!(-, Sub(sub), SubAssign(sub_assign), rhs = Point<T> => rhs.x, rhs.y); |
| 71 | point_op!(*, Mul(mul), MulAssign(mul_assign), rhs = Point<T> => rhs.x, rhs.y); |
| 72 | point_op!(/, Div(div), DivAssign(div_assign), rhs = Point<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); |
| 77 | |
| 78 | ////////// multiply point with scalar ////////////////////////////////////////// |
| 79 | impl<T: Mul<Output = T> + Copy> Mul<T> for Point<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 Point<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 | ////////// divide point with scalar //////////////////////////////////////////// |
| 100 | impl<T: Div<Output = T> + Copy> Div<T> for Point<T> { |
| 101 | type Output = Self; |
| 102 | |
| 103 | fn div(self, rhs: T) -> Self { |
| 104 | Self { |
| 105 | x: self.x / rhs, |
| 106 | y: self.y / rhs, |
| 107 | } |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | impl<T: Div<Output = T> + Copy> DivAssign<T> for Point<T> { |
| 112 | fn div_assign(&mut self, rhs: T) { |
| 113 | *self = Self { |
| 114 | x: self.x / rhs, |
| 115 | y: self.y / rhs, |
| 116 | } |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | impl<T: Neg<Output = T>> Neg for Point<T> { |
| 121 | type Output = Self; |
| 122 | |
| 123 | fn neg(self) -> Self { |
| 124 | Self { |
| 125 | x: -self.x, |
| 126 | y: -self.y, |
| 127 | } |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | impl<T> From<(T, T)> for Point<T> { |
| 132 | fn from(item: (T, T)) -> Self { |
| 133 | Point { |
| 134 | x: item.0, |
| 135 | y: item.1, |
| 136 | } |
| 137 | } |
| 138 | } |
| 139 | |
| 140 | impl<T> From<Point<T>> for (T, T) { |
| 141 | fn from(item: Point<T>) -> Self { |
| 142 | (item.x, item.y) |
| 143 | } |
| 144 | } |
| 145 | |
| 146 | impl From<Degrees> for Point<f64> { |
| 147 | fn from(item: Degrees) -> Self { |
| 148 | let r = item.0.to_radians(); |
| 149 | Point { |
| 150 | x: r.cos(), |
| 151 | y: r.sin(), |
| 152 | } |
| 153 | } |
| 154 | } |
| 155 | |
| 156 | impl From<Radians> for Point<f64> { |
| 157 | fn from(item: Radians) -> Self { |
| 158 | Point { |
| 159 | x: item.0.cos(), |
| 160 | y: item.0.sin(), |
| 161 | } |
| 162 | } |
| 163 | } |
| 164 | |
| 165 | #[derive(Debug, Default, PartialEq, Clone, Copy)] |
| 166 | pub struct Degrees(pub f64); |
| 167 | #[derive(Debug, Default, PartialEq, Clone, Copy)] |
| 168 | pub struct Radians(pub f64); |
| 169 | |
| 170 | impl Degrees { |
| 171 | #[allow(dead_code)] |
| 172 | fn to_radians(&self) -> Radians { |
| 173 | Radians(self.0.to_radians()) |
| 174 | } |
| 175 | } |
| 176 | |
| 177 | impl Radians { |
| 178 | #[allow(dead_code)] |
| 179 | fn to_degrees(&self) -> Degrees { |
| 180 | Degrees(self.0.to_degrees()) |
| 181 | } |
| 182 | } |
| 183 | |
| 184 | #[macro_export] |
| 185 | macro_rules! rect { |
| 186 | ( $x:expr, $y:expr ) => { |
| 187 | Rect { x: $x, y: $y } |
| 188 | }; |
| 189 | } |
| 190 | |
| 191 | #[derive(Default)] |
| 192 | pub struct Rect<T> { |
| 193 | pub width: T, |
| 194 | pub height: T, |
| 195 | } |
| 196 | |
| 197 | impl<T: Mul<Output = T> + Copy> Rect<T> { |
| 198 | #[allow(dead_code)] |
| 199 | pub fn area(&self) -> T { |
| 200 | self.width * self.height |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | impl<T> From<(T, T)> for Rect<T> { |
| 205 | fn from(item: (T, T)) -> Self { |
| 206 | Rect { |
| 207 | width: item.0, |
| 208 | height: item.1, |
| 209 | } |
| 210 | } |
| 211 | } |
| 212 | |
| 213 | #[macro_export] |
| 214 | macro_rules! hashmap { |
| 215 | ($($k:expr => $v:expr),*) => { |
| 216 | { |
| 217 | let mut map = std::collections::HashMap::new(); |
| 218 | $(map.insert($k, $v);)* |
| 219 | map |
| 220 | } |
| 221 | } |
| 222 | } |
| 223 | |
| 224 | #[cfg(test)] |
| 225 | mod tests { |
| 226 | use super::*; |
| 227 | |
| 228 | #[test] |
| 229 | fn immutable_copy_of_point() { |
| 230 | let a = point!(0, 0); |
| 231 | let mut b = a; // Copy |
| 232 | assert_eq!(a, b); // PartialEq |
| 233 | b.x = 1; |
| 234 | assert_ne!(a, b); // PartialEq |
| 235 | } |
| 236 | |
| 237 | #[test] |
| 238 | fn add_points() { |
| 239 | let mut a = point!(1, 0); |
| 240 | assert_eq!(a + point!(2, 2), point!(3, 2)); // Add |
| 241 | a += point!(2, 2); // AddAssign |
| 242 | assert_eq!(a, point!(3, 2)); |
| 243 | assert_eq!(point!(1, 0) + (2, 3), point!(3, 3)); |
| 244 | } |
| 245 | |
| 246 | #[test] |
| 247 | fn sub_points() { |
| 248 | let mut a = point!(1, 0); |
| 249 | assert_eq!(a - point!(2, 2), point!(-1, -2)); |
| 250 | a -= point!(2, 2); |
| 251 | assert_eq!(a, point!(-1, -2)); |
| 252 | assert_eq!(point!(1, 0) - (2, 3), point!(-1, -3)); |
| 253 | } |
| 254 | |
| 255 | #[test] |
| 256 | fn mul_points() { |
| 257 | let mut a = point!(1, 2); |
| 258 | assert_eq!(a * 2, point!(2, 4)); |
| 259 | assert_eq!(a * point!(2, 3), point!(2, 6)); |
| 260 | a *= 2; |
| 261 | assert_eq!(a, point!(2, 4)); |
| 262 | a *= point!(3, 1); |
| 263 | assert_eq!(a, point!(6, 4)); |
| 264 | assert_eq!(point!(1, 0) * (2, 3), point!(2, 0)); |
| 265 | } |
| 266 | |
| 267 | #[test] |
| 268 | fn div_points() { |
| 269 | let mut a = point!(4, 8); |
| 270 | assert_eq!(a / 2, point!(2, 4)); |
| 271 | assert_eq!(a / point!(2, 4), point!(2, 2)); |
| 272 | a /= 2; |
| 273 | assert_eq!(a, point!(2, 4)); |
| 274 | a /= point!(2, 4); |
| 275 | assert_eq!(a, point!(1, 1)); |
| 276 | assert_eq!(point!(6, 3) / (2, 3), point!(3, 1)); |
| 277 | } |
| 278 | |
| 279 | #[test] |
| 280 | fn neg_point() { |
| 281 | assert_eq!(point!(1, 1), -point!(-1, -1)); |
| 282 | } |
| 283 | |
| 284 | #[test] |
| 285 | fn angles() { |
| 286 | assert_eq!(Radians(0.0).to_degrees(), Degrees(0.0)); |
| 287 | assert_eq!(Radians(std::f64::consts::PI).to_degrees(), Degrees(180.0)); |
| 288 | assert_eq!(Degrees(180.0).to_radians(), Radians(std::f64::consts::PI)); |
| 289 | assert!((Point::from(Degrees(90.0)) - point!(0.0, 1.0)).length() < 0.001); |
| 290 | assert!((Point::from(Radians(std::f64::consts::FRAC_PI_2)) - point!(0.0, 1.0)).length() < 0.001); |
| 291 | } |
| 292 | |
| 293 | #[test] |
| 294 | fn area_for_rect_of_multipliable_type() { |
| 295 | let r: Rect<_> = (30, 20).into(); // the Into trait uses the From trait |
| 296 | assert_eq!(r.area(), 30 * 20); |
| 297 | // let a = Rect::from(("a".to_string(), "b".to_string())).area(); // this doesn't work, because area() is not implemented for String |
| 298 | } |
| 299 | } |