Square Tunnel

// By Roni Kaufman

// https://ronikaufman.github.io/

​

function setup() {

  createCanvas(500, 500);

  noFill();

  noLoop();

  strokeCap(PROJECT);

}

​

function draw() {

  background(0);

  translate(width/2, height/2);

  let palette = [[253, 55, 65], [254, 79, 17], [255, 104, 0], [255, 166, 26], [255, 194, 25], [255, 209, 20], [252, 216, 46], [244, 215, 48], [206, 213, 98], [138, 195, 143], [121, 183, 160], [114, 181, 177], [91, 155, 174], [107, 161, 183], [73, 97, 157], [96, 71, 145], [114, 30, 127], [155, 43, 119], [171, 37, 98], [202, 40, 71]];

  let colors = [];

  let n_colors = floor(random(3, 9));

  for (let i = 0; i < n_colors; i++) {

    let col = floor(random(random(palette.length)));

    colors.push(palette.splice(col, 1)[0]);

  }

  let thetaStep = TWO_PI/24;

  let d = 104;

  for (let i = 0; i < 9; i++) {

    let delta = pow(i+7, 2.5)/5;

    strokeWeight(delta/10);

    for (let theta = 0; theta < TWO_PI; theta += thetaStep) {

      stroke(random(colors));

      let d1 = d + delta/4;

      let d2 = d + 3*delta/4;

      let theta1 = theta+thetaStep/4;

      let theta2 = theta+3*thetaStep/4;

      arc(0, 0, d1, d1, theta1, theta2);

      arc(0, 0, d2, d2, theta1, theta2);

      line(d1/2*cos(theta1), d1/2*sin(theta1), d2/2*cos(theta1), d2/2*sin(theta1));

      line(d1/2*cos(theta2), d1/2*sin(theta2), d2/2*cos(theta2), d2/2*sin(theta2));

    }

    d += delta;

  }

}

​

function keyPressed() {

  if (key === " ") {

    redraw();

  }

}