penlib/
lib.rs

1//! A collection of characteristics for various pen brands and products.
2//! This library was created to assist in creating SVG images for use by pen
3//! plotters. Pen sizes and colors can be used to more carefully plan spacing
4//! between paths, or to produce SVG images which will more closely resemble
5//! the result of plotting to real paper.
6pub mod blend;
7pub mod papermate;
8pub mod posca;
9
10use std::hash::Hash;
11
12use palette::rgb::LinSrgb;
13use palette::{Hsl, Lab};
14
15pub trait Pen: Clone + Eq + PartialEq + Hash {
16    fn available_colors() -> Vec<Self>;
17
18    fn nib_size_mm() -> f64;
19
20    fn rgb_color(&self) -> LinSrgb;
21
22    fn hsl_color(&self) -> Hsl {
23        self.rgb_color().into()
24    }
25
26    fn lab_color(&self) -> Lab {
27        self.rgb_color().into()
28    }
29
30    fn closest_pen_to_color(icolor: Lab) -> Self {
31        let available_pens = Self::available_colors();
32
33        let (l, a, b) = icolor.into_components();
34
35        let mut closest = available_pens[0].clone();
36        let mut mindist = std::f32::MAX;
37
38        for pen in available_pens {
39            let (pl, pa, pb) = pen.lab_color().into_components();
40
41            let dist = ((pl - l).powi(2) + (pa - a).powi(2) + (pb - b).powi(2)).sqrt();
42
43            if dist < mindist {
44                mindist = dist;
45                closest = pen.clone();
46            }
47        }
48        closest
49    }
50
51    fn rgb_pixel(&self) -> (u8, u8, u8) {
52        let (r, g, b) = self.rgb_color().into_components();
53        ((r * 255.0) as u8, (g * 255.0) as u8, (b * 255.0) as u8)
54    }
55}
penlib/lib.rs

penlib/
lib.rs
