Function torcurve 

pub fn torcurve(x: f64, a: f64, b: f64, c: f64) -> f64

a generalized, parameterized curve formula for generating lots of different curve shapes useful for easing, etc.

Arguments

• x - input that drives the curve. clamped to 0..=1
• a - controls the start of the curve
• b - controls the middle of the curve
• c - pinches the tail of the curve

Example

use torcurve_rs::torcurve;
fn run_code() {
    for i in 0..=10 {
         println!("curve {}", torcurve(i as f64 * 0.1, 3.0, 0.0, 0.0));
    }
}

note: implemented using https://jsfiddle.net/torcado194/5ocmt48a/latest as reference, the js fiddle may be useful to tune the parameters