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2020: day12: factorize quadrant computation

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This commit is contained in:
Antoine Martin 2020-12-12 17:43:56 +01:00
parent 8d34969eaa
commit bae2c9cb2c
1 changed files with 8 additions and 5 deletions
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13
aoc2020/src/day12.rs
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@ -43,6 +43,12 @@ fn part2(input: &str) -> aoc::Result<i64> {
Ok(ship.manhattan_distance()) Ok(ship.manhattan_distance())
} }
fn get_quadrants(degrees: i64) -> usize {
debug_assert!(degrees % 90 == 0, "only right angles are supported");
(degrees / 90) as usize
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)] #[derive(Debug, Clone, Copy, PartialEq, Eq)]
enum Direction { enum Direction {
North, North,
@ -60,8 +66,7 @@ impl Direction {
]; ];
fn rotate(self, turn_dir: TurnDirection, degrees: i64) -> Direction { fn rotate(self, turn_dir: TurnDirection, degrees: i64) -> Direction {
debug_assert!(degrees % 90 == 0, "only right angles are supported"); let quadrants = get_quadrants(degrees);
let quadrants = (degrees / 90) as usize;
let directions_iter = Self::CLOCKWISE_DIRECTIONS.iter().copied(); let directions_iter = Self::CLOCKWISE_DIRECTIONS.iter().copied();
@ -203,9 +208,7 @@ impl Ship {
ActionKind::Move(dir) => self.waypoint.coordinates.move_towards(dir, action.arg), ActionKind::Move(dir) => self.waypoint.coordinates.move_towards(dir, action.arg),
ActionKind::Turn(turn_dir) => { ActionKind::Turn(turn_dir) => {
debug_assert!(action.arg % 90 == 0, "only right angles are supported"); let quadrants = get_quadrants(action.arg);
let quadrants = (action.arg / 90) as usize % 4;
self.waypoint.turn(turn_dir, quadrants); self.waypoint.turn(turn_dir, quadrants);
} }