Function x_res 

pub fn x_res(dim: &Dimension, extent: &Extent) -> f64

Resolution (pixel width) in the x direction.

Example

use vaster::x_res;
assert!((x_res(&[10, 5], &[0.0, 100.0, 0.0, 50.0]) - 10.0).abs() < 1e-10);