Module cgmath::conv

Constrained conversion functions for assisting in situations where type inference is difficult.

For example, when declaring glium uniforms, we need to convert to fixed length arrays. We can use the Into trait directly, but it is rather ugly!

#[macro_use]
extern crate glium;
extern crate cgmath;

use cgmath::{Matrix4, Point2};
use cgmath::prelude::*;

let point = Point2::new(1, 2);
let matrix = Matrix4::from_scale(2.0);

let uniforms = uniform! {
    point: Into::<[_; 2]>::into(point),
    matrix: Into::<[[_; 4]; 4]>::into(matrix),
    // Yuck!! (ﾉಥ益ಥ）ﾉ ┻━┻
};

Instead, we can use the conversion functions from the conv module:

#[macro_use]
extern crate glium;
extern crate cgmath;

use cgmath::{Matrix4, Point2};
use cgmath::prelude::*;
use cgmath::conv::*;

let point = Point2::new(1, 2);
let matrix = Matrix4::from_scale(2.0);

let uniforms = uniform! {
    point: array2(point),
    matrix: array4x4(matrix),
    // ┬─┬ノ( º _ ºノ)
};

Functions

array2	Force a conversion into a 2-element array.
array3	Force a conversion into a 3-element array.
array4	Force a conversion into a 4-element array.
array2x2	Force a conversion into a 2x2-element array.
array3x3	Force a conversion into a 3x3-element array.
array4x4	Force a conversion into a 4x4-element array.