gfxmath-vec2

A simple 2D math library.

• gfxmath-vec2
  • Vec2
  • Operators
• Known Limitations
  • Left-Hand Primitives
  • Hash Implementation
• Showcase
• License

Vec2

There are multiple ways we can create a Vec2 object.

use gfxmath_vec2::Vec2;

// Standard 'new' semantics.
let v = Vec2::<f32>::new(3.0, 4.0);

// Using macro 'vec2!'
use gfxmath_vec2::vec2;
let v: Vec2<f32> = vec2!(3.0, 4.0);

// Using 'into' from a tuple.
let v: Vec2<f32> = (3.0, 4.0).into();

// Using 'into' from a borrowed tuple
let t = (3.0, 4.0);
let v: Vec2<f32> = (&t).into();

We can also create tuples from Vec2 objects.

use gfxmath_vec2::Vec2;

// With owned Vec2 object
let v = Vec2::<f32>::new(3.0, 4.0);
let t: (f32, f32) = v.into();

// With borrowed Vec2 object
let v = Vec2::<f32>::new(3.0, 4.0);
let t: (f32, f32) = (&v).into();

Operators

Common mathematical operators are implemented for Vec2.

• + , +=
• - , -=
• * , *=
• / , /=

// Reminder: Rust automatically infers floats to `f64` and integers to `i64`.
use gfxmath_vec2::Vec2;

let v1 = Vec2::new(3.0, 9.0);
let v2 = Vec2::new(4.0, 5.0);

let res = v1 + v2;

assert_eq!(7.0, res.x);
assert_eq!(14.0, res.y);

Known Limitations

Left-Hand Primitives

One caveat is that operators where the Left-Hand side is a primitive has limited support. This is due to restrictions for trait implementations. impl <T> Add<Vec2<T>> for T is illegal within Rust syntax (due to the trailing T) because the implementation must be for a known type for non-local traits and types. Since Add is from the core package and T (the type to be implemented for) is not derived from a local trait, this is not possible.

At the time of this writing, primitives that work on the Left-Hand Side for common operators are f32, f64, i32, and i64.

use gfxmath_vec2::Vec2;

// Works
let lhs: f32 = 4.0;
let rhs = Vec2::<f32>::new(3.0, 4.0);
let res = lhs + rhs;

// NOT SUPPORTED!!
let lhs: u32 = 4;
let rhs = Vec2::<u32>::new(3, 4);
let res = lhs + rhs;

Hash Implementation

Currently, Hash implementations are limited for the following types:

• f32
• f64
• i32
• i64
• u32
• u64

Showcase

License

Apache 2.0