//! `Point` type.

use super::epnt;
use crate::{err::*, fixed::Unit};

/// Reads a `Point` object.
pub fn read_o(b: &[u8]) -> ResultS<Point>
{
	read_data! {
		endian: BIG, buf: b, size: 4, start: 0, data {
			let x = Unit[0];
			let y = Unit[2];
		}
	}

	Ok(Point{x, y})
}

/// Writes a `Point` object.
pub fn write_o(v: Point) -> Vec<u8>
{
	let mut o = Vec::with_capacity(4);
	o.extend(&v.x.to_be_bytes());
	o.extend(&v.y.to_be_bytes());
	o
}

/// Reads a `PNTS` chunk.
pub fn read(b: &[u8]) -> ResultS<(Point, usize)> {Ok((read_o(b)?, 4))}

impl From<&Point> for Point
{
	fn from(pnts: &Point) -> Self {*pnts}
}

impl From<epnt::Endpoint> for Point
{
	fn from(epnt: epnt::Endpoint) -> Self {epnt.pos}
}

impl From<&epnt::Endpoint> for Point
{
	fn from(epnt: &epnt::Endpoint) -> Self {epnt.pos}
}

/// A point in world-space.
#[cfg_attr(feature = "serde_obj", derive(serde::Serialize))]
#[derive(Copy, Clone, Debug, Default, Eq, PartialEq)]
pub struct Point {
	pub x: Unit,
	pub y: Unit,
}

// EOF