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use std::fmt;
use rand;
use rand::distributions::{IndependentSample, Range};
#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, Serialize, Deserialize)]
pub enum Direction {
North,
East,
South,
West,
}
use Direction::*;
impl fmt::Display for Direction {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.write_str(
match self {
&North => "North",
&East => "East",
&South => "South",
&West => "West"
}
)
}
}
impl Direction {
pub fn random() -> Direction {
let mut rng = rand::thread_rng();
let between = Range::new(0, 4);
let dir = between.ind_sample(&mut rng);
match dir {
0 => North,
1 => East,
2 => South,
3 => West,
_ => panic!("Invalid number generated by random number generator")
}
}
}
#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, Serialize, Deserialize)]
pub struct Point {
pub x: u16,
pub y: u16
}
impl Point {
pub fn new(x: u16, y: u16) -> Point {
Point {
x: x,
y: y
}
}
pub fn random(map_size: u16) -> Point {
let mut rng = rand::thread_rng();
let between = Range::new(0, map_size);
let x = between.ind_sample(&mut rng);
let y = between.ind_sample(&mut rng);
Point::new(x, y)
}
pub fn move_point(&self, direction: Direction, distance: i32, map_size: u16) -> Option<Point> {
let x = self.x as i32 + match direction {
West => -distance,
East => distance,
_ => 0
};
let y = self.y as i32 + match direction {
South => -distance,
North => distance,
_ => 0
};
let max = map_size as i32;
if x >= max || y >= max || x < 0 || y < 0 {
None
}
else {
Some(Point::new(x as u16, y as u16))
}
}
pub fn move_point_no_bounds_check(&self, direction: Direction, distance: i32) -> Point {
let x = self.x as i32 + match direction {
West => -distance,
East => distance,
_ => 0
};
let y = self.y as i32 + match direction {
South => -distance,
North => distance,
_ => 0
};
Point::new(x as u16, y as u16)
}
pub fn check_for_ship_collision(&self, ship_start: Point, direction: Direction, length: u16) -> bool {
let reverse = match direction {
West | South => true,
East | North => false
};
let same_cross = match direction {
East | West => self.y == ship_start.y,
North | South => self.x == ship_start.x
};
let (parr_self, parr_ship) = match direction {
East | West => (self.x, ship_start.x),
North | South => (self.y, ship_start.y)
};
let corrected_parr_ship = match reverse {
true => 1 + parr_ship - length,
false => parr_ship
};
same_cross && parr_self >= corrected_parr_ship && parr_self < corrected_parr_ship + length
}
pub fn is_adjacent(&self, other: Point) -> bool {
let dx = if self.x > other.x {self.x - other.x} else {other.x - self.x};
let dy = if self.y > other.y {self.y - other.y} else {other.y - self.y};
(dx == 0 && dy == 1) ||
(dx == 1 && dy == 0)
}
pub fn is_on_lattice(&self, lattice_size: u16) -> bool {
(self.x + self.y) % lattice_size == 0
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn ship_collision_check_works_west() {
assert_eq!(true, Point::new(5,5).check_for_ship_collision(Point::new(5,5), West, 5));
assert_eq!(true, Point::new(5,5).check_for_ship_collision(Point::new(6,5), West, 5));
assert_eq!(true, Point::new(5,5).check_for_ship_collision(Point::new(7,5), West, 5));
assert_eq!(true, Point::new(5,5).check_for_ship_collision(Point::new(8,5), West, 5));
assert_eq!(true, Point::new(5,5).check_for_ship_collision(Point::new(9,5), West, 5));
assert_eq!(false, Point::new(5,5).check_for_ship_collision(Point::new(10,5), West, 5));
assert_eq!(false, Point::new(5,5).check_for_ship_collision(Point::new(4,5), West, 5));
assert_eq!(false, Point::new(5,5).check_for_ship_collision(Point::new(6,4), West, 5));
assert_eq!(false, Point::new(5,5).check_for_ship_collision(Point::new(6,6), West, 5));
}
#[test]
fn ship_collision_check_works_east() {
assert_eq!(true, Point::new(5,5).check_for_ship_collision(Point::new(5,5), East, 5));
assert_eq!(true, Point::new(5,5).check_for_ship_collision(Point::new(4,5), East, 5));
assert_eq!(true, Point::new(5,5).check_for_ship_collision(Point::new(3,5), East, 5));
assert_eq!(true, Point::new(5,5).check_for_ship_collision(Point::new(2,5), East, 5));
assert_eq!(true, Point::new(5,5).check_for_ship_collision(Point::new(1,5), East, 5));
assert_eq!(false, Point::new(5,5).check_for_ship_collision(Point::new(0,5), East, 5));
assert_eq!(false, Point::new(5,5).check_for_ship_collision(Point::new(6,5), East, 5));
assert_eq!(false, Point::new(5,5).check_for_ship_collision(Point::new(4,4), East, 5));
assert_eq!(false, Point::new(5,5).check_for_ship_collision(Point::new(4,6), East, 5));
}
#[test]
fn ship_collision_check_works_north() {
assert_eq!(true, Point::new(5,5).check_for_ship_collision(Point::new(5,5), North, 5));
assert_eq!(true, Point::new(5,5).check_for_ship_collision(Point::new(5,4), North, 5));
assert_eq!(true, Point::new(5,5).check_for_ship_collision(Point::new(5,3), North, 5));
assert_eq!(true, Point::new(5,5).check_for_ship_collision(Point::new(5,2), North, 5));
assert_eq!(true, Point::new(5,5).check_for_ship_collision(Point::new(5,1), North, 5));
assert_eq!(false, Point::new(5,5).check_for_ship_collision(Point::new(5,0), North, 5));
assert_eq!(false, Point::new(5,5).check_for_ship_collision(Point::new(5,6), North, 5));
assert_eq!(false, Point::new(5,5).check_for_ship_collision(Point::new(4,4), North, 5));
assert_eq!(false, Point::new(5,5).check_for_ship_collision(Point::new(6,4), North, 5));
}
#[test]
fn ship_collision_check_works_south() {
assert_eq!(true, Point::new(5,5).check_for_ship_collision(Point::new(5,5), South, 5));
assert_eq!(true, Point::new(5,5).check_for_ship_collision(Point::new(5,6), South, 5));
assert_eq!(true, Point::new(5,5).check_for_ship_collision(Point::new(5,7), South, 5));
assert_eq!(true, Point::new(5,5).check_for_ship_collision(Point::new(5,8), South, 5));
assert_eq!(true, Point::new(5,5).check_for_ship_collision(Point::new(5,9), South, 5));
assert_eq!(false, Point::new(5,5).check_for_ship_collision(Point::new(5,10), South, 5));
assert_eq!(false, Point::new(5,5).check_for_ship_collision(Point::new(5,4), South, 5));
assert_eq!(false, Point::new(5,5).check_for_ship_collision(Point::new(4,6), South, 5));
assert_eq!(false, Point::new(5,5).check_for_ship_collision(Point::new(6,6), South, 5));
}
#[test]
fn adjacency_check_works() {
assert_eq!(true, Point::new(5,5).is_adjacent(Point::new(4,5)));
assert_eq!(true, Point::new(5,5).is_adjacent(Point::new(6,5)));
assert_eq!(true, Point::new(5,5).is_adjacent(Point::new(5,4)));
assert_eq!(true, Point::new(5,5).is_adjacent(Point::new(5,6)));
assert_eq!(false, Point::new(5,5).is_adjacent(Point::new(4,4)));
assert_eq!(false, Point::new(5,5).is_adjacent(Point::new(6,6)));
assert_eq!(false, Point::new(5,5).is_adjacent(Point::new(6,4)));
assert_eq!(false, Point::new(5,5).is_adjacent(Point::new(4,6)));
assert_eq!(false, Point::new(5,5).is_adjacent(Point::new(5,5)));
assert_eq!(false, Point::new(5,5).is_adjacent(Point::new(10,5)));
}
#[test]
fn point_on_4_lattice_works() {
assert_eq!(true, Point::new(0,0).is_on_lattice(4));
assert_eq!(true, Point::new(4,0).is_on_lattice(4));
assert_eq!(true, Point::new(0,4).is_on_lattice(4));
assert_eq!(true, Point::new(4,4).is_on_lattice(4));
assert_eq!(true, Point::new(1,3).is_on_lattice(4));
assert_eq!(true, Point::new(3,1).is_on_lattice(4));
assert_eq!(false, Point::new(0,1).is_on_lattice(4));
assert_eq!(false, Point::new(0,2).is_on_lattice(4));
assert_eq!(false, Point::new(0,3).is_on_lattice(4));
assert_eq!(false, Point::new(1,0).is_on_lattice(4));
assert_eq!(false, Point::new(2,0).is_on_lattice(4));
assert_eq!(false, Point::new(3,0).is_on_lattice(4));
}
#[test]
fn point_on_2_lattice_works() {
assert_eq!(true, Point::new(0,0).is_on_lattice(2));
assert_eq!(true, Point::new(2,0).is_on_lattice(2));
assert_eq!(true, Point::new(0,2).is_on_lattice(2));
assert_eq!(true, Point::new(2,2).is_on_lattice(2));
assert_eq!(true, Point::new(1,1).is_on_lattice(2));
assert_eq!(false, Point::new(0,1).is_on_lattice(2));
assert_eq!(false, Point::new(1,0).is_on_lattice(2));
}
}
|
