pakt08
See /software/p5js/pakt-februari/pakt08/ for a JavaScript version and /software/supercollider/februari-pakt/pakt08/ for accompanying sound code.
use nannou::lyon;
use nannou::prelude::*;
const N: u16 = 25;
fn main() {
nannou::app(model)
.update(update)
.simple_window(view)
.size(640, 480)
.run();
}
struct Model {
d: f32,
theta: f32,
speed: f32,
spread: f32,
points: Vec<Point2>,
}
fn model(_app: &App) -> Model {
let d = 0.0001;
let theta = 0.0;
let speed = 0.00002;
let spread = 2.0;
let mut points = vec![];
for _i in 0..N {
points.push(pt2(0.0001, 0.0001));
}
Model {
d,
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 c = (model.theta + (i * model.d)).cos();
let s = (model.theta + (i * model.d)).sin();
let x = p.x / win.w();
let y = p.y / win.h();
p.x = ((c * x) - (s * y)) * win.w() + model.spread;
p.y = ((c * y) + (s * x)) * win.h() + model.spread;
model.theta += model.speed;
}
}
fn view(app: &App, model: &Model, frame: Frame) {
let draw = app.draw();
frame.clear(BLACK);
let mut builder = nannou::geom::path::Builder::new().with_svg();
for p in model.points.iter() {
builder.line_to(lyon::math::point(p.x, p.y));
}
builder.close();
let path = builder.build();
draw.scale_axes(vec3(1.0, -1.0, 1.0))
.color_blend(BLEND_SUBTRACT)
.path()
.fill()
.color(RED)
.events(path.iter());
draw.to_frame(app, &frame).unwrap();
}