//! `Point` type.

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))}

/// 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