Commit | Line | Data |
---|---|---|
2836f506 | 1 | use std::ops::{Add, AddAssign, Sub, SubAssign, Mul, MulAssign, Div, DivAssign, Neg}; |
296187ca | 2 | |
b0566120 TW |
3 | pub type Nanoseconds = u64; |
4 | ||
787dbfb4 | 5 | #[macro_export] |
296187ca | 6 | macro_rules! point { |
6ba7aef1 TW |
7 | ( $x:expr, $y:expr ) => { |
8 | Point2D { x: $x, y: $y } | |
9 | }; | |
296187ca TW |
10 | } |
11 | ||
b0566120 | 12 | #[derive(Debug, Default, Copy, Clone, PartialEq)] |
296187ca TW |
13 | pub struct Point2D<T> { |
14 | pub x: T, | |
15 | pub y: T, | |
16 | } | |
17 | ||
18 | impl Point2D<f64> { | |
19 | pub fn length(self) -> f64 { | |
20 | ((self.x * self.x) + (self.y * self.y)).sqrt() | |
21 | } | |
22 | } | |
23 | ||
6cd86b94 TW |
24 | macro_rules! point_op { |
25 | ($op:tt, $trait:ident($fn:ident), $trait_assign:ident($fn_assign:ident), $rhs:ident = $Rhs:ty => $x:expr, $y:expr) => { | |
26 | impl<T: $trait<Output = T>> $trait<$Rhs> for Point2D<T> { | |
27 | type Output = Self; | |
28 | ||
29 | fn $fn(self, $rhs: $Rhs) -> Self { | |
30 | Self { | |
31 | x: self.x $op $x, | |
32 | y: self.y $op $y, | |
33 | } | |
34 | } | |
2836f506 | 35 | } |
2836f506 | 36 | |
6cd86b94 TW |
37 | impl<T: $trait<Output = T> + Copy> $trait_assign<$Rhs> for Point2D<T> { |
38 | fn $fn_assign(&mut self, $rhs: $Rhs) { | |
39 | *self = Self { | |
40 | x: self.x $op $x, | |
41 | y: self.y $op $y, | |
42 | } | |
43 | } | |
2836f506 TW |
44 | } |
45 | } | |
46 | } | |
47 | ||
6cd86b94 TW |
48 | point_op!(+, Add(add), AddAssign(add_assign), rhs = Point2D<T> => rhs.x, rhs.y); |
49 | point_op!(-, Sub(sub), SubAssign(sub_assign), rhs = Point2D<T> => rhs.x, rhs.y); | |
50 | point_op!(*, Mul(mul), MulAssign(mul_assign), rhs = Point2D<T> => rhs.x, rhs.y); | |
51 | point_op!(/, Div(div), DivAssign(div_assign), rhs = Point2D<T> => rhs.x, rhs.y); | |
52 | point_op!(+, Add(add), AddAssign(add_assign), rhs = (T, T) => rhs.0, rhs.1); | |
53 | point_op!(-, Sub(sub), SubAssign(sub_assign), rhs = (T, T) => rhs.0, rhs.1); | |
54 | point_op!(*, Mul(mul), MulAssign(mul_assign), rhs = (T, T) => rhs.0, rhs.1); | |
55 | point_op!(/, Div(div), DivAssign(div_assign), rhs = (T, T) => rhs.0, rhs.1); | |
2836f506 TW |
56 | |
57 | ////////// multiply point with scalar ////////////////////////////////////////// | |
58 | impl<T: Mul<Output = T> + Copy> Mul<T> for Point2D<T> { | |
59 | type Output = Self; | |
60 | ||
61 | fn mul(self, rhs: T) -> Self { | |
62 | Self { | |
63 | x: self.x * rhs, | |
64 | y: self.y * rhs, | |
65 | } | |
66 | } | |
67 | } | |
68 | ||
69 | impl<T: Mul<Output = T> + Copy> MulAssign<T> for Point2D<T> { | |
70 | fn mul_assign(&mut self, rhs: T) { | |
71 | *self = Self { | |
72 | x: self.x * rhs, | |
73 | y: self.y * rhs, | |
74 | } | |
75 | } | |
76 | } | |
77 | ||
2836f506 TW |
78 | ////////// divide point with scalar //////////////////////////////////////////// |
79 | impl<T: Div<Output = T> + Copy> Div<T> for Point2D<T> { | |
80 | type Output = Self; | |
81 | ||
82 | fn div(self, rhs: T) -> Self { | |
83 | Self { | |
84 | x: self.x / rhs, | |
85 | y: self.y / rhs, | |
86 | } | |
87 | } | |
88 | } | |
89 | ||
90 | impl<T: Div<Output = T> + Copy> DivAssign<T> for Point2D<T> { | |
91 | fn div_assign(&mut self, rhs: T) { | |
92 | *self = Self { | |
93 | x: self.x / rhs, | |
94 | y: self.y / rhs, | |
95 | } | |
96 | } | |
97 | } | |
98 | ||
2836f506 TW |
99 | impl<T: Neg<Output = T>> Neg for Point2D<T> { |
100 | type Output = Self; | |
101 | ||
102 | fn neg(self) -> Self { | |
103 | Self { | |
104 | x: -self.x, | |
105 | y: -self.y, | |
106 | } | |
296187ca TW |
107 | } |
108 | } | |
109 | ||
b0566120 TW |
110 | impl<T> From<(T, T)> for Point2D<T> { |
111 | fn from(item: (T, T)) -> Self { | |
112 | Point2D { | |
113 | x: item.0, | |
114 | y: item.1, | |
115 | } | |
116 | } | |
117 | } | |
118 | ||
e58a1769 TW |
119 | impl From<Degrees> for Point2D<f64> { |
120 | fn from(item: Degrees) -> Self { | |
121 | Point2D { | |
122 | x: (item.0 * std::f64::consts::PI / 180.0).cos(), | |
123 | y: (item.0 * std::f64::consts::PI / 180.0).sin(), | |
124 | } | |
125 | } | |
126 | } | |
127 | ||
128 | impl From<Radians> for Point2D<f64> { | |
129 | fn from(item: Radians) -> Self { | |
130 | Point2D { | |
131 | x: item.0.cos(), | |
132 | y: item.0.sin(), | |
133 | } | |
134 | } | |
135 | } | |
136 | ||
137 | #[derive(Debug, PartialEq, Clone, Copy)] | |
138 | struct Degrees(f64); | |
139 | #[derive(Debug, PartialEq, Clone, Copy)] | |
140 | struct Radians(f64); | |
141 | ||
142 | impl Degrees { | |
143 | fn to_radians(&self) -> Radians { | |
144 | Radians(self.0 * std::f64::consts::PI / 180.0) | |
145 | } | |
146 | } | |
147 | ||
148 | impl Radians { | |
149 | fn to_degrees(&self) -> Degrees { | |
150 | Degrees(self.0 * 180.0 * std::f64::consts::FRAC_1_PI) | |
151 | } | |
152 | } | |
153 | ||
0b5024d1 TW |
154 | #[macro_export] |
155 | macro_rules! rect { | |
156 | ( $x:expr, $y:expr ) => { | |
157 | Rect { x: $x, y: $y } | |
158 | }; | |
159 | } | |
160 | ||
6edafdc0 TW |
161 | #[derive(Default)] |
162 | pub struct Rect<T> { | |
163 | pub width: T, | |
164 | pub height: T, | |
165 | } | |
166 | ||
6ba7aef1 | 167 | impl<T: Mul<Output = T> + Copy> Rect<T> { |
6edafdc0 TW |
168 | #[allow(dead_code)] |
169 | pub fn area(&self) -> T { | |
6ba7aef1 | 170 | self.width * self.height |
6edafdc0 TW |
171 | } |
172 | } | |
173 | ||
174 | impl<T> From<(T, T)> for Rect<T> { | |
175 | fn from(item: (T, T)) -> Self { | |
6ba7aef1 TW |
176 | Rect { |
177 | width: item.0, | |
178 | height: item.1, | |
179 | } | |
6edafdc0 TW |
180 | } |
181 | } | |
182 | ||
296187ca TW |
183 | #[cfg(test)] |
184 | mod tests { | |
185 | use super::*; | |
186 | ||
187 | #[test] | |
188 | fn immutable_copy_of_point() { | |
189 | let a = point!(0, 0); | |
190 | let mut b = a; // Copy | |
191 | assert_eq!(a, b); // PartialEq | |
192 | b.x = 1; | |
193 | assert_ne!(a, b); // PartialEq | |
194 | } | |
195 | ||
196 | #[test] | |
197 | fn add_points() { | |
198 | let mut a = point!(1, 0); | |
199 | assert_eq!(a + point!(2, 2), point!(3, 2)); // Add | |
200 | a += point!(2, 2); // AddAssign | |
201 | assert_eq!(a, point!(3, 2)); | |
2836f506 TW |
202 | assert_eq!(point!(1, 0) + (2, 3), point!(3, 3)); |
203 | } | |
204 | ||
205 | #[test] | |
206 | fn sub_points() { | |
207 | let mut a = point!(1, 0); | |
208 | assert_eq!(a - point!(2, 2), point!(-1, -2)); | |
209 | a -= point!(2, 2); | |
210 | assert_eq!(a, point!(-1, -2)); | |
6cd86b94 | 211 | assert_eq!(point!(1, 0) - (2, 3), point!(-1, -3)); |
2836f506 TW |
212 | } |
213 | ||
214 | #[test] | |
215 | fn mul_points() { | |
216 | let mut a = point!(1, 2); | |
217 | assert_eq!(a * 2, point!(2, 4)); | |
218 | assert_eq!(a * point!(2, 3), point!(2, 6)); | |
219 | a *= 2; | |
220 | assert_eq!(a, point!(2, 4)); | |
221 | a *= point!(3, 1); | |
222 | assert_eq!(a, point!(6, 4)); | |
6cd86b94 | 223 | assert_eq!(point!(1, 0) * (2, 3), point!(2, 0)); |
2836f506 TW |
224 | } |
225 | ||
226 | #[test] | |
227 | fn div_points() { | |
228 | let mut a = point!(4, 8); | |
229 | assert_eq!(a / 2, point!(2, 4)); | |
230 | assert_eq!(a / point!(2, 4), point!(2, 2)); | |
231 | a /= 2; | |
232 | assert_eq!(a, point!(2, 4)); | |
233 | a /= point!(2, 4); | |
234 | assert_eq!(a, point!(1, 1)); | |
6cd86b94 | 235 | assert_eq!(point!(6, 3) / (2, 3), point!(3, 1)); |
2836f506 TW |
236 | } |
237 | ||
238 | #[test] | |
239 | fn neg_point() { | |
240 | assert_eq!(point!(1, 1), -point!(-1, -1)); | |
296187ca | 241 | } |
6edafdc0 TW |
242 | |
243 | #[test] | |
e58a1769 TW |
244 | fn angles() { |
245 | assert_eq!(Radians(0.0).to_degrees(), Degrees(0.0)); | |
246 | assert_eq!(Radians(std::f64::consts::PI).to_degrees(), Degrees(180.0)); | |
247 | assert_eq!(Degrees(180.0).to_radians(), Radians(std::f64::consts::PI)); | |
248 | assert!((Point2D::from(Degrees(90.0)) - point!(0.0, 1.0)).length() < 0.001); | |
249 | assert!((Point2D::from(Radians(std::f64::consts::FRAC_PI_2)) - point!(0.0, 1.0)).length() < 0.001); | |
250 | } | |
251 | ||
252 | #[test] | |
6edafdc0 TW |
253 | fn area_for_rect_of_multipliable_type() { |
254 | let r: Rect<_> = (30, 20).into(); // the Into trait uses the From trait | |
6ba7aef1 | 255 | assert_eq!(r.area(), 30 * 20); |
6edafdc0 TW |
256 | // let a = Rect::from(("a".to_string(), "b".to_string())).area(); // this doesn't work, because area() is not implemented for String |
257 | } | |
296187ca | 258 | } |