here_be_dragons/src/geometry.rs

141 lines
3.5 KiB
Rust

//! Support function for 2D geometry
//!
/// Position on the map
#[derive(Default, PartialEq, Copy, Clone, Debug, Eq, Hash)]
pub struct Point {
pub x: usize,
pub y: usize,
}
impl Point {
/// Create new point
pub fn new(x: usize, y: usize) -> Point {
Point { x, y }
}
/// Create new point from i32 coords
pub fn new_i32(x: i32, y: i32) -> Point {
Point::new(x as usize, y as usize)
}
/// Euclidean distance to a given point
pub fn distance_to(self, point: &Point) -> f32 {
let a = (self.x as f32 - point.x as f32).powf(2.0);
let b = (self.y as f32 - point.y as f32).powf(2.0);
(a + b).sqrt()
}
}
/// Rectangle region on the map
#[derive(Hash, PartialEq, Eq, Copy, Clone, Debug)]
pub struct Rect {
pub x1: usize,
pub x2: usize,
pub y1: usize,
pub y2: usize,
}
impl Rect {
pub fn new(x: usize, y: usize, width: usize, height: usize) -> Rect {
Rect {
x1: x,
y1: y,
x2: x + width,
y2: y + height,
}
}
pub fn new_i32(x: i32, y: i32, width: i32, height: i32) -> Rect {
Rect::new(x as usize, y as usize, width as usize, height as usize)
}
/// Returns `true` if this overlaps with `other`
pub fn intersect(&self, other: &Rect) -> bool {
self.x1 <= other.x2 && self.x2 >= other.x1 && self.y1 <= other.y2 && self.y2 >= other.y1
}
/// Returns `true` if this contains `point`
pub fn contains(self, point: &Point) -> bool {
point.x > self.x1 && point.x < self.x2 && point.y > self.y1 && point.y < self.y2
}
pub fn center(&self) -> Point {
Point::new((self.x1 + self.x2) / 2, (self.y1 + self.y2) / 2)
}
pub fn width(&self) -> usize {
if self.x2 >= self.x1 {
self.x2 - self.x1
} else {
self.x1 - self.x2
}
}
pub fn height(&self) -> usize {
if self.y2 >= self.y1 {
self.y2 - self.y1
} else {
self.y1 - self.y2
}
}
}
/// Calculate abs value between 2 usize values
/// Example:
/// ```
/// use here_be_dragons::geometry::usize_abs;
///
/// assert_eq!(usize_abs(5, 3), 2);
/// assert_eq!(usize_abs(3, 5), 2);
/// ```
pub fn usize_abs(x: usize, y: usize) -> usize {
if x >= y {
x - y
} else {
y - x
}
}
/// ------------------------------------------------------------------------------------------------
/// Module unit tests
/// ------------------------------------------------------------------------------------------------
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_distance() {
let p1 = Point::new(10, 10);
let p2 = Point::new(14, 7);
let distance = p1.distance_to(&p2);
assert_eq!(distance, 5.0);
}
#[test]
fn test_intersect() {
let rect1 = Rect::new(10, 10, 40, 40);
let rect2 = Rect::new(30, 30, 60, 60);
assert!(rect1.intersect(&rect2));
}
#[test]
fn test_contains() {
let rect = Rect::new(10, 10, 5, 5);
assert!(rect.contains(&rect.center()));
let p = Point::new(5, 5);
assert!(!rect.contains(&p));
let p = Point::new(10, 10);
assert!(!rect.contains(&p));
let p = Point::new(11, 11);
assert!(rect.contains(&p));
}
#[test]
fn test_size() {
let rect1 = Rect::new(10, 10, 40, 30);
assert_eq!(rect1.width(), 40);
assert_eq!(rect1.height(), 30);
}
}