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//! Implements 2d vectors
//!
//! This is implemented generictly with types that fit in the Number trait
use crate::{Float, Number};
use std::ops::{Sub, Add};
use std::fmt;
use std::cmp::min;
#[derive(Clone, Copy)]
pub struct Vector2<T: Number> {
pub x: T,
pub y: T,
}
pub type Vector2f = Vector2<Float>;
pub type Vector2i = Vector2<i32>;
impl<T: Number> Vector2<T> {
pub fn new(initial: T) -> Vector2<T> {
Vector2 { x: initial, y: initial }
}
pub fn new_xy(x: T, y: T) -> Vector2<T> {
Vector2 { x, y }
}
}
impl<T: Number> Sub for Vector2<T> {
type Output = Self;
fn sub(self, op: Self) -> Self::Output {
Self::new_xy(
self.x - op.x,
self.y - op.y,
)
}
}
impl<T: Number> Add for Vector2<T> {
type Output = Self;
fn add(self, op: Self) -> Self::Output {
Self::new_xy(
self.x + op.x,
self.y + op.y,
)
}
}
impl<T: Number> fmt::Display for Vector2<T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.write_fmt(format_args!("[{}, {}]", self.x, self.y))
}
}
impl Vector2f {
pub fn ceil(&self) -> Self {
Self::new_xy(
self.x.ceil(),
self.y.ceil()
)
}
pub fn floor(&self) -> Self {
Self::new_xy(
self.x.floor(),
self.y.floor()
)
}
}
impl From<Vector2i> for Vector2f {
fn from(v: Vector2i) -> Self {
Self {
x: v.x as Float,
y: v.y as Float,
}
}
}
impl From<Vector2f> for Vector2i {
fn from(v: Vector2f) -> Self {
Self {
x: v.x as i32,
y: v.y as i32,
}
}
}
impl Vector2i {
pub fn cap(&self, x: i32, y: i32) -> Self {
Self::new_xy(
min(self.x, x),
min(self.y, y),
)
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn new_vec2() {
let v = Vector2::new_xy(2.0, 10.0);
assert!(v.x == 2.0 && v.y == 10.0);
let v = Vector2::new(3);
assert!(v.x == 3 && v.y == 3);
}
#[test]
fn sub_vec2() {
let v1 = Vector2::new_xy(10, 11);
let v2 = Vector2::new_xy(2, 3);
let v3 = v1-v2;
assert!(v3.x == 8 && v3.y == 8);
}
#[test]
fn add_vec2() {
let v1 = Vector2::new_xy(10, 11);
let v2 = Vector2::new_xy(2, 3);
let v3 = v1+v2;
assert!(v3.x == 12 && v3.y == 14);
}
}
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