Module cgmath::conv [] [src]

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.