Create workspace from previous implementation files

kairo-common/src/point.rs

@@ -0,0 +1,243 @@
+use std::{
+    fmt::{Display, Formatter},
+    ops,
+};
+
+#[derive(Debug, Clone, Copy, Default, PartialEq)]
+pub struct Point {
+    pub x: f64,
+    pub y: f64,
+}
+
+impl Point {
+    pub fn new(x: f64, y: f64) -> Point {
+        Point { x, y }
+    }
+    pub fn zero() -> Point {
+        Point { x: 0.0, y: 0.0 }
+    }
+    pub fn is_valid(&self) -> bool {
+        !self.x.is_nan() && !self.y.is_nan()
+    }
+    pub fn module(&self) -> f64 {
+        f64::sqrt(self.x * self.x + self.y * self.y)
+    }
+    pub fn phase(&self) -> f64 {
+        f64::atan2(self.y, self.x)
+    }
+    pub fn distance(a: &Point, b: &Point) -> f64 {
+        (a - b).module()
+    }
+    pub fn distance_to(&self, other: &Point) -> f64 {
+        (self - other).module()
+    }
+    pub fn as_versor(&self) -> Option<Point> {
+        if self.x == 0.0 && self.y == 0.0 {
+            None
+        } else {
+            Some(self / self.module())
+        }
+    }
+    pub fn rotate_by(&mut self, α: f64) {
+        let m = self.module();
+        let (sin, cos) = f64::sin_cos(self.phase() + α);
+        self.x = m * cos;
+        self.y = m * sin;
+    }
+}
+
+impl Display for Point {
+    fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
+        write!(f, "({:.2},{:.2})", &self.x, &self.y)
+    }
+}
+
+impl ops::Add<Point> for Point {
+    type Output = Point;
+    fn add(self, rhs: Point) -> Point {
+        Point {
+            x: self.x + rhs.x,
+            y: self.y + rhs.y,
+        }
+    }
+}
+impl ops::Add<&Point> for &Point {
+    type Output = Point;
+    fn add(self, rhs: &Point) -> Point {
+        Point {
+            x: self.x + rhs.x,
+            y: self.y + rhs.y,
+        }
+    }
+}
+impl ops::AddAssign<&Point> for Point {
+    fn add_assign(&mut self, rhs: &Point) {
+        *self = Self {
+            x: self.x + rhs.x,
+            y: self.y + rhs.y,
+        };
+    }
+}
+impl ops::AddAssign<Point> for Point {
+    fn add_assign(&mut self, rhs: Point) {
+        *self = Self {
+            x: self.x + rhs.x,
+            y: self.y + rhs.y,
+        };
+    }
+}
+impl ops::SubAssign<&Point> for Point {
+    fn sub_assign(&mut self, rhs: &Point) {
+        *self = Self {
+            x: self.x - rhs.x,
+            y: self.y - rhs.y,
+        };
+    }
+}
+impl ops::SubAssign<Point> for Point {
+    fn sub_assign(&mut self, rhs: Point) {
+        *self = Self {
+            x: self.x - rhs.x,
+            y: self.y - rhs.y,
+        };
+    }
+}
+impl ops::Sub<Point> for Point {
+    type Output = Point;
+    fn sub(self, rhs: Point) -> Point {
+        Point {
+            x: self.x - rhs.x,
+            y: self.y - rhs.y,
+        }
+    }
+}
+impl ops::Sub<&Point> for &Point {
+    type Output = Point;
+    fn sub(self, rhs: &Point) -> Point {
+        Point {
+            x: self.x - rhs.x,
+            y: self.y - rhs.y,
+        }
+    }
+}
+
+impl ops::Mul<f64> for Point {
+    type Output = Point;
+    fn mul(self, rhs: f64) -> Point {
+        Point {
+            x: self.x * rhs,
+            y: self.y * rhs,
+        }
+    }
+}
+impl ops::MulAssign<f64> for Point {
+    fn mul_assign(&mut self, rhs: f64) {
+        *self = Point {
+            x: self.x * rhs,
+            y: self.y * rhs,
+        }
+    }
+}
+impl ops::Mul<f64> for &Point {
+    type Output = Point;
+    fn mul(self, rhs: f64) -> Point {
+        Point {
+            x: self.x * rhs,
+            y: self.y * rhs,
+        }
+    }
+}
+impl ops::Div<f64> for Point {
+    type Output = Point;
+    fn div(self, rhs: f64) -> Point {
+        Point {
+            x: self.x / rhs,
+            y: self.y / rhs,
+        }
+    }
+}
+impl ops::DivAssign<f64> for Point {
+    fn div_assign(&mut self, rhs: f64) {
+        *self = Point {
+            x: self.x / rhs,
+            y: self.y / rhs,
+        }
+    }
+}
+impl ops::Div<f64> for &Point {
+    type Output = Point;
+    fn div(self, rhs: f64) -> Point {
+        Point {
+            x: self.x / rhs,
+            y: self.y / rhs,
+        }
+    }
+}
+
+#[test]
+fn test() {
+    use std::f64::consts::{FRAC_1_SQRT_2, FRAC_PI_2, FRAC_PI_4, SQRT_2};
+    // New
+    let p = Point::new(0.0, 0.0);
+    print!("Testing Point::new()");
+    assert_eq!(p, Point { x: 0.0, y: 0.0 });
+    assert_ne!(p, Point { x: -1.0, y: 1.0 });
+    println!(" ... ok");
+
+    // is_valid
+    let n = Point::new(std::f64::NAN, std::f64::NAN);
+    let nn = Point::new(std::f64::NAN, 0.0);
+    print!("Testing Point::is_valid()");
+    assert_eq!(p.is_valid(), true);
+    assert_eq!(n.is_valid(), false);
+    assert_eq!(nn.is_valid(), false);
+    println!(" ... ok");
+
+    // module
+    let p = Point::new(1.0, 1.0);
+    let r = Point::new(2.0, 0.0);
+    print!("Testing Point::module()");
+    assert!(f64::abs(p.module() - SQRT_2) < 1e-10);
+    assert!(f64::abs(r.module() - 2.0) < 1e-10);
+    println!(" ... ok");
+
+    // phase
+    let p = Point::new(1.0, 1.0);
+    let r = Point::new(2.0, 0.0);
+    let q = Point::new(2.0, -2.0);
+    print!("Testing Point::phase()");
+    assert!(f64::abs(p.phase() - FRAC_PI_4) < 1e-6);
+    assert!(f64::abs(r.phase() - 0.0) < 1e-6);
+    assert!(f64::abs(q.phase() + FRAC_PI_4) < 1e-6);
+    println!(" ... ok");
+
+    //distance
+    let z = Point::zero();
+    let p = Point::new(1.0, 0.0);
+    let q = Point::new(1.0, 1.0);
+    print!("Testing Point::distance() and distance_to()");
+    assert_eq!(z.distance_to(&p), 1.0);
+    assert_eq!(Point::distance(&z, &p), 1.0);
+    assert!(f64::abs(Point::distance(&z, &q) - SQRT_2) < 1e-10);
+    println!(" ... ok");
+
+    //versor
+    print!("Testing Point::as_versor()");
+    assert_eq!(z.as_versor(), None);
+    assert_eq!(p, p.as_versor().unwrap());
+    let q_ver = q.as_versor().unwrap();
+    assert!(f64::abs(q_ver.x - FRAC_1_SQRT_2) < 1e-10);
+    assert!(f64::abs(q_ver.y - FRAC_1_SQRT_2) < 1e-10);
+    println!(" ... ok");
+
+    //rotate_by
+    let mut p = Point::new(1.0, 0.0);
+    print!("Testing Point::rotate_by()");
+    p.rotate_by(FRAC_PI_2);
+    assert!(f64::abs(p.x - 0.0) < 1e-10);
+    assert!(f64::abs(p.y - 1.0) < 1e-10);
+    p.rotate_by(-FRAC_PI_4);
+    assert!(f64::abs(p.x - FRAC_1_SQRT_2) < 1e-10);
+    assert!(f64::abs(p.y - FRAC_1_SQRT_2) < 1e-10);
+    println!(" ... ok");
+}