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/*
Copyright 2016 Martin Buck
This file is part of rust-3d.
rust-3d is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
rust-3d is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with rust-3d. If not, see <http://www.gnu.org/licenses/>.
*/
//! Norm2D, a normalized vector within 2D space
use std::cmp::{Eq, Ordering};
use std::hash::{Hash, Hasher};
use std::ops::{Mul};
use prelude::*;
use distances_2d::*;
#[derive (Debug, PartialEq, PartialOrd, Clone)]
/// Norm2D, a normalized vector within 2D space
pub struct Norm2D {
x: f64,
y: f64
}
impl Eq for Norm2D {}
impl Ord for Norm2D {
fn cmp(&self, other: &Self) -> Ordering {
let origin = Point2D::default();
sqr_dist_2d(&origin, self).partial_cmp(&sqr_dist_2d(&origin, other)).unwrap_or(Ordering::Equal)
}
}
impl Hash for Norm2D {
fn hash<H: Hasher>(&self, state: &mut H) {
(self.x as u64).hash(state);
(self.y as u64).hash(state);
}
}
impl Mul<f64> for Norm2D {
type Output = Point2D;
fn mul(self, other: f64) -> Point2D {
Point2D{x: other * self.x, y: other * self.y}
}
}
impl IsND for Norm2D {
fn n_dimensions() -> usize {
2
}
fn get_position(&self, dimension: usize) -> Result<f64> {
match dimension {
0 => Ok(self.x),
1 => Ok(self.y),
_ => Err(ErrorKind::IncorrectDimension)
}
}
}
impl Is2D for Norm2D {
fn x(&self) -> f64 {
self.x
}
fn y(&self) -> f64 {
self.y
}
}
impl IsNormalized2D for Norm2D {
fn new<P>(p: P) -> Result<Self> where
P: Is2D {
let l = p.abs();
if l.get() <= 0.0 {
return Err(ErrorKind::NormalizeVecWithoutLength);
}
Ok(Norm2D { x: p.x() / l.get(), y: p.y() / l.get() })
}
fn norm_x() -> Self {
Norm2D {
x: 1.0,
y: 0.0
}
}
fn norm_y() -> Self {
Norm2D {
x: 0.0,
y: 1.0
}
}
}