pakt06

See /software/p5js/pakt-februari/pakt06/ for a JavaScript version and /software/supercollider/februari-pakt/pakt06/ for accompanying sound code.

use nannou::prelude::*;

const N: u16 = 50;

fn main() {
  nannou::app(model)
    .update(update)
    .simple_window(view)
    .size(640, 480)
    .run();
}
struct Model {
  theta: f32,
  speed: f32,
  spread: f32,
  points: Vec<Vec2>,
}
fn model(_app: &App) -> Model {
  let theta = 0.0;
  let speed = 0.00002;
  let spread = 1.0;
  let mut points = vec![];
  for _i in 0..N {
    points.push(vec2(0.0, 0.0));
  }
  Model {
    theta,
    speed,
    spread,
    points,
  }
}
fn update(app: &App, model: &mut Model, _update: Update) {
  let win = app.window_rect();
  for p in model.points.iter_mut() {
    let x = p.x / win.w();
    let y = p.y / win.h();
    p.x = ((model.theta.cos() * x) - (model.theta.sin() * y)) * win.w() + model.spread;
    p.y = ((model.theta.cos() * y) + (model.theta.sin() * x)) * win.h() + model.spread;
    model.theta -= model.speed;
  }
}
fn view(app: &App, model: &Model, frame: Frame) {
  let draw = app.draw();
  frame.clear(BLACK);
  for p in model.points.iter() {
    draw.ellipse()
      .xy(*p)
      .radius(50.0)
      .stroke_weight(1.0)
      .stroke(WHITE)
      .color(RED);
  }

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