69 releases
0.19.8  Apr 8, 2019 

0.19.7 

0.19.5  Jan 12, 2019 
0.19.4  Dec 7, 2018 
0.1.5  Jul 23, 2015 
#12 in Math
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Used in 90 crates (31 directly)
336KB
8K
SLoC
euclid
This is a small library for geometric types with a focus on 2d graphics and layout.
lib.rs
:
A collection of strongly typed math tools for computer graphics with an inclination towards 2d graphics and layout.
All types are generic over the scalar type of their component (f32
, i32
, etc.),
and tagged with a generic Unit parameter which is useful to prevent mixing
values from different spaces. For example it should not be legal to translate
a screenspace position by a worldspace vector and this can be expressed using
the generic Unit parameter.
This unit system is not mandatory and all Typed* structures have an alias
with the default unit: UnknownUnit
.
for example Point2D<T>
is equivalent to TypedPoint2D<T, UnknownUnit>
.
Client code typically creates a set of aliases for each type and doesn't need
to deal with the specifics of typed units further. For example:
use euclid::*;
pub struct ScreenSpace;
pub type ScreenPoint = TypedPoint2D<f32, ScreenSpace>;
pub type ScreenSize = TypedSize2D<f32, ScreenSpace>;
pub struct WorldSpace;
pub type WorldPoint = TypedPoint3D<f32, WorldSpace>;
pub type ProjectionMatrix = TypedTransform3D<f32, WorldSpace, ScreenSpace>;
// etc...
All euclid types are marked #[repr(C)]
in order to facilitate exposing them to
foreign function interfaces (provided the underlying scalar type is also repr(C)
).
Components are accessed in their scalar form by default for convenience, and most
types additionally implement strongly typed accessors which return typed Length
wrappers.
For example:
# use euclid::*;
# pub struct WorldSpace;
# pub type WorldPoint = TypedPoint3D<f32, WorldSpace>;
let p = WorldPoint::new(0.0, 1.0, 1.0);
// p.x is an f32.
println!("p.x = {:?} ", p.x);
// p.x is a Length<f32, WorldSpace>.
println!("p.x_typed() = {:?} ", p.x_typed());
// Length::get returns the scalar value (f32).
assert_eq!(p.x, p.x_typed().get());
Dependencies
~1MB
~19K SLoC