pakt26

See /software/p5js/pakt-februari/pakt26/ for a JavaScript version and /software/supercollider/februari-pakt/pakt26/ for accompanying sound code.

use nannou::prelude::*;

fn main() {
    nannou::app(model)
        .update(update)
        .simple_window(view)
        .size(640, 480)
        .run();
}
struct Model {
    index: f32,
    nx: f32,
    ny: f32,
    cols: f32,
    rows: f32,
}
fn model(_app: &App) -> Model {
    let index = 0.0;
    let nx = 45.0;
    let ny = 9.0;
    let cols = 0.0;
    let rows = ny;
    Model {
        index,
        nx,
        ny,
        cols,
        rows,
    }
}
fn update(app: &App, model: &mut Model, _update: Update) {
    model.index = app.time * 60.0;
    model.cols = ((model.index * 0.001 + ((model.index * 0.0001) * 10.0).sin()).sin() * 0.445
        + 0.5)
        * (model.nx - 1.0);
}
fn view(app: &App, model: &Model, frame: Frame) {
    let draw = app.draw();
    let win = app.window_rect();

    if frame.nth() == 0 {
        frame.clear(BLACK);
    } else {
        draw.rect().wh(win.wh()).color(rgba(0.0, 0.0, 0.0, 0.06));
    }

    let rx = win.w() / model.cols;
    let ry = win.h() / model.rows;
    for x in 0..model.cols as u32 {
        let x = x as f32;
        for y in 0..model.rows as u32 {
            let y = y as f32;
            let c = ((model.index + (x * model.rows) + y)
                * (model.index * 0.0012).cos()
                * (model.index * 0.00006).sin()
                * 0.5)
                .sin()
                * 0.5
                + 0.5;
            let g = c
                * ((model.index * 0.002 + (x / model.nx * 2.0 * PI)).sin()
                    * (model.index * 0.0018 + (y / model.ny * 2.0 * PI)).cos())
                * 12.0
                + 9.0;
            let r = Rect::from_w_h(rx - (g * 2.0), ry - (g * 2.0));
            draw.scale_axes(vec3(1.0, -1.0, 1.0))
                .translate(vec3(win.w(), win.h(), 0.0) * -0.5)
                .rect()
                .xy(vec2(x * rx + g, y * ry + g) - r.bottom_left())
                .wh(r.wh())
                .color(rgba(1.0, c, c, c));
        }
    }

    draw.to_frame(app, &frame).unwrap();
}