//! Geometrical primitives.

#[macro_use]
mod macros;
mod align;
mod angle;
mod dir;
mod em;
mod fraction;
mod gen;
mod length;
mod paint;
mod path;
mod point;
mod ratio;
mod relative;
mod scalar;
mod sides;
mod spec;
mod transform;

pub use align::*;
pub use angle::*;
pub use dir::*;
pub use em::*;
pub use fraction::*;
pub use gen::*;
pub use length::*;
pub use paint::*;
pub use path::*;
pub use point::*;
pub use ratio::*;
pub use relative::*;
pub use scalar::*;
pub use sides::*;
pub use spec::*;
pub use transform::*;

use std::cmp::Ordering;
use std::f64::consts::PI;
use std::fmt::{self, Debug, Formatter};
use std::hash::{Hash, Hasher};
use std::iter::Sum;
use std::ops::*;

/// Generic access to a structure's components.
pub trait Get<Index> {
    /// The structure's component type.
    type Component;

    /// Return the component for the specified index.
    fn get(self, index: Index) -> Self::Component;

    /// Borrow the component for the specified index mutably.
    fn get_mut(&mut self, index: Index) -> &mut Self::Component;

    /// Convenience method for setting a component.
    fn set(&mut self, index: Index, component: Self::Component) {
        *self.get_mut(index) = component;
    }
}

/// A numeric type.
pub trait Numeric:
    Sized
    + Debug
    + Copy
    + PartialEq
    + Neg<Output = Self>
    + Add<Output = Self>
    + Sub<Output = Self>
    + Mul<f64, Output = Self>
    + Div<f64, Output = Self>
{
    /// The identity element for addition.
    fn zero() -> Self;

    /// Whether `self` is zero.
    fn is_zero(self) -> bool {
        self == Self::zero()
    }

    /// Whether `self` consists only of finite parts.
    fn is_finite(self) -> bool;
}

/// Round a float to two decimal places.
fn round_2(value: f64) -> f64 {
    (value * 100.0).round() / 100.0
}