Function pathfinder::tools::range_color

pub fn range_color(
    falloff: i16,
    base: Rgba<u8>,
    base_geo: Coordinate,
    to_geo: Coordinate
) -> Rgba<u8>

Returns a Rgba with a modified value depending on how close it is to it’s falloff point.

Examples

First declare the colors and the range at which it becomes darker.

extern crate image;
use pathfinder::{tools, Coordinate};

let falloff = 100;
let color = image::Rgba {
    data: [100, 100, 100, 255],
};

Evaluate that based on the modified distance, in the small sense it is modified from the defined color above.

let base = Coordinate::new(0, 0);
let to = Coordinate::new(10, 10);
assert_eq!(
    tools::range_color(falloff, color, base, to),
    image::Rgba {
        data: [77, 77, 77, 255]
    }
);