+++ /dev/null
-use std::ops::{Add, AddAssign, Sub, SubAssign, Mul, MulAssign, Div, DivAssign, Neg};
-
-#[macro_export]
-macro_rules! point {
- ( $x:expr, $y:expr ) => {
- Point2D { x: $x, y: $y }
- };
-}
-
-#[derive(Debug, Default, Copy, Clone, PartialEq)]
-pub struct Point2D<T> {
- pub x: T,
- pub y: T,
-}
-
-impl Point2D<f64> {
- pub fn length(&self) -> f64 {
- ((self.x * self.x) + (self.y * self.y)).sqrt()
- }
-
- pub fn normalized(&self) -> Self {
- let l = self.length();
- Self {
- x: self.x / l,
- y: self.y / l,
- }
- }
-
- pub fn to_radians(&self) -> Radians {
- Radians(self.y.atan2(self.x))
- }
-
- pub fn to_degrees(&self) -> Degrees {
- self.to_radians().to_degrees()
- }
-
- pub fn to_i32(self) -> Point2D<i32> {
- Point2D {
- x: self.x as i32,
- y: self.y as i32,
- }
- }
-}
-
-macro_rules! point_op {
- ($op:tt, $trait:ident($fn:ident), $trait_assign:ident($fn_assign:ident), $rhs:ident = $Rhs:ty => $x:expr, $y:expr) => {
- impl<T: $trait<Output = T>> $trait<$Rhs> for Point2D<T> {
- type Output = Self;
-
- fn $fn(self, $rhs: $Rhs) -> Self {
- Self {
- x: self.x $op $x,
- y: self.y $op $y,
- }
- }
- }
-
- impl<T: $trait<Output = T> + Copy> $trait_assign<$Rhs> for Point2D<T> {
- fn $fn_assign(&mut self, $rhs: $Rhs) {
- *self = Self {
- x: self.x $op $x,
- y: self.y $op $y,
- }
- }
- }
- }
-}
-
-point_op!(+, Add(add), AddAssign(add_assign), rhs = Point2D<T> => rhs.x, rhs.y);
-point_op!(-, Sub(sub), SubAssign(sub_assign), rhs = Point2D<T> => rhs.x, rhs.y);
-point_op!(*, Mul(mul), MulAssign(mul_assign), rhs = Point2D<T> => rhs.x, rhs.y);
-point_op!(/, Div(div), DivAssign(div_assign), rhs = Point2D<T> => rhs.x, rhs.y);
-point_op!(+, Add(add), AddAssign(add_assign), rhs = (T, T) => rhs.0, rhs.1);
-point_op!(-, Sub(sub), SubAssign(sub_assign), rhs = (T, T) => rhs.0, rhs.1);
-point_op!(*, Mul(mul), MulAssign(mul_assign), rhs = (T, T) => rhs.0, rhs.1);
-point_op!(/, Div(div), DivAssign(div_assign), rhs = (T, T) => rhs.0, rhs.1);
-
-////////// multiply point with scalar //////////////////////////////////////////
-impl<T: Mul<Output = T> + Copy> Mul<T> for Point2D<T> {
- type Output = Self;
-
- fn mul(self, rhs: T) -> Self {
- Self {
- x: self.x * rhs,
- y: self.y * rhs,
- }
- }
-}
-
-impl<T: Mul<Output = T> + Copy> MulAssign<T> for Point2D<T> {
- fn mul_assign(&mut self, rhs: T) {
- *self = Self {
- x: self.x * rhs,
- y: self.y * rhs,
- }
- }
-}
-
-////////// divide point with scalar ////////////////////////////////////////////
-impl<T: Div<Output = T> + Copy> Div<T> for Point2D<T> {
- type Output = Self;
-
- fn div(self, rhs: T) -> Self {
- Self {
- x: self.x / rhs,
- y: self.y / rhs,
- }
- }
-}
-
-impl<T: Div<Output = T> + Copy> DivAssign<T> for Point2D<T> {
- fn div_assign(&mut self, rhs: T) {
- *self = Self {
- x: self.x / rhs,
- y: self.y / rhs,
- }
- }
-}
-
-impl<T: Neg<Output = T>> Neg for Point2D<T> {
- type Output = Self;
-
- fn neg(self) -> Self {
- Self {
- x: -self.x,
- y: -self.y,
- }
- }
-}
-
-impl<T> From<(T, T)> for Point2D<T> {
- fn from(item: (T, T)) -> Self {
- Point2D {
- x: item.0,
- y: item.1,
- }
- }
-}
-
-impl<T> From<Point2D<T>> for (T, T) {
- fn from(item: Point2D<T>) -> Self {
- (item.x, item.y)
- }
-}
-
-impl From<Degrees> for Point2D<f64> {
- fn from(item: Degrees) -> Self {
- let r = item.0.to_radians();
- Point2D {
- x: r.cos(),
- y: r.sin(),
- }
- }
-}
-
-impl From<Radians> for Point2D<f64> {
- fn from(item: Radians) -> Self {
- Point2D {
- x: item.0.cos(),
- y: item.0.sin(),
- }
- }
-}
-
-#[derive(Debug, Default, PartialEq, Clone, Copy)]
-pub struct Degrees(pub f64);
-#[derive(Debug, Default, PartialEq, Clone, Copy)]
-pub struct Radians(pub f64);
-
-impl Degrees {
- #[allow(dead_code)]
- fn to_radians(&self) -> Radians {
- Radians(self.0.to_radians())
- }
-}
-
-impl Radians {
- #[allow(dead_code)]
- fn to_degrees(&self) -> Degrees {
- Degrees(self.0.to_degrees())
- }
-}
-
-#[macro_export]
-macro_rules! rect {
- ( $x:expr, $y:expr ) => {
- Rect { x: $x, y: $y }
- };
-}
-
-#[derive(Default)]
-pub struct Rect<T> {
- pub width: T,
- pub height: T,
-}
-
-impl<T: Mul<Output = T> + Copy> Rect<T> {
- #[allow(dead_code)]
- pub fn area(&self) -> T {
- self.width * self.height
- }
-}
-
-impl<T> From<(T, T)> for Rect<T> {
- fn from(item: (T, T)) -> Self {
- Rect {
- width: item.0,
- height: item.1,
- }
- }
-}
-
-#[macro_export]
-macro_rules! hashmap {
- ($($k:expr => $v:expr),*) => {
- {
- let mut map = std::collections::HashMap::new();
- $(map.insert($k, $v);)*
- map
- }
- }
-}
-
-#[cfg(test)]
-mod tests {
- use super::*;
-
- #[test]
- fn immutable_copy_of_point() {
- let a = point!(0, 0);
- let mut b = a; // Copy
- assert_eq!(a, b); // PartialEq
- b.x = 1;
- assert_ne!(a, b); // PartialEq
- }
-
- #[test]
- fn add_points() {
- let mut a = point!(1, 0);
- assert_eq!(a + point!(2, 2), point!(3, 2)); // Add
- a += point!(2, 2); // AddAssign
- assert_eq!(a, point!(3, 2));
- assert_eq!(point!(1, 0) + (2, 3), point!(3, 3));
- }
-
- #[test]
- fn sub_points() {
- let mut a = point!(1, 0);
- assert_eq!(a - point!(2, 2), point!(-1, -2));
- a -= point!(2, 2);
- assert_eq!(a, point!(-1, -2));
- assert_eq!(point!(1, 0) - (2, 3), point!(-1, -3));
- }
-
- #[test]
- fn mul_points() {
- let mut a = point!(1, 2);
- assert_eq!(a * 2, point!(2, 4));
- assert_eq!(a * point!(2, 3), point!(2, 6));
- a *= 2;
- assert_eq!(a, point!(2, 4));
- a *= point!(3, 1);
- assert_eq!(a, point!(6, 4));
- assert_eq!(point!(1, 0) * (2, 3), point!(2, 0));
- }
-
- #[test]
- fn div_points() {
- let mut a = point!(4, 8);
- assert_eq!(a / 2, point!(2, 4));
- assert_eq!(a / point!(2, 4), point!(2, 2));
- a /= 2;
- assert_eq!(a, point!(2, 4));
- a /= point!(2, 4);
- assert_eq!(a, point!(1, 1));
- assert_eq!(point!(6, 3) / (2, 3), point!(3, 1));
- }
-
- #[test]
- fn neg_point() {
- assert_eq!(point!(1, 1), -point!(-1, -1));
- }
-
- #[test]
- fn angles() {
- assert_eq!(Radians(0.0).to_degrees(), Degrees(0.0));
- assert_eq!(Radians(std::f64::consts::PI).to_degrees(), Degrees(180.0));
- assert_eq!(Degrees(180.0).to_radians(), Radians(std::f64::consts::PI));
- assert!((Point2D::from(Degrees(90.0)) - point!(0.0, 1.0)).length() < 0.001);
- assert!((Point2D::from(Radians(std::f64::consts::FRAC_PI_2)) - point!(0.0, 1.0)).length() < 0.001);
- }
-
- #[test]
- fn area_for_rect_of_multipliable_type() {
- let r: Rect<_> = (30, 20).into(); // the Into trait uses the From trait
- assert_eq!(r.area(), 30 * 20);
- // let a = Rect::from(("a".to_string(), "b".to_string())).area(); // this doesn't work, because area() is not implemented for String
- }
-}
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