use crate::*;

/// A cardinal direction.
#[derive(Copy, Clone, PartialEq)]
pub enum Direction { North, South, West, East, }
pub use self::Direction::*;

impl Direction {
    #[inline]
    pub fn split_fixed <N: Coordinate> (self, area: impl Area<N>, a: N) -> ([N;4],[N;4]) {
        match self {
            North => (
                [area.x(), (area.y()+area.h()).minus(a), area.w(), a],
                [area.x(), area.y(), area.w(), area.h().minus(a)],
            ),
            South => (
                [area.x(), area.y(), area.w(), a],
                [area.x(), area.y() + a, area.w(), area.h().minus(a)],
            ),
            East => (
                [area.x(), area.y(), a, area.h()],
                [area.x() + a, area.y(), area.w().minus(a), area.h()],
            ),
            West => (
                [area.x() + area.w() - a, area.y(), a, area.h()],
                [area.x(), area.y(), area.w() - a, area.h()],
            ),
        }
    }
}