pakt07

See /software/p5js/pakt-februari/pakt07/ for a JavaScript version and /software/supercollider/februari-pakt/pakt07/ for accompanying sound code.

use nannou::prelude::*;

const N: u16 = 30;

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(pt2(0.0, 0.0));
  }
  Model {
    theta,
    speed,
    spread,
    points,
  }
}
fn update(app: &App, model: &mut Model, _update: Update) {
  let win = app.window_rect();
  for (i, p) in model.points.iter_mut().enumerate() {
    let i = i as f32;
    let x = p.x / win.w();
    let y = p.y / win.h();
    p.x = (((model.theta + (i * 0.001)).cos() * x) - ((model.theta + (i * 0.001)).sin() * y))
      * win.w()
      + model.spread;
    p.y = (((model.theta + (i * 0.001)).cos() * y) + ((model.theta + (i * 0.001)).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.scale_axes(vec3(1.0, -1.0, 1.0))
      .color_blend(BLEND_SUBTRACT)
      .ellipse()
      .xy(*p)
      .radius(50.0)
      .color(RED);
  }

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