Based on p5.js demos by Matt DesLauriers

https://github.com/mattdesl/workshop-p5-intro

​

The MIT License (MIT) Copyright (c) 2019 Matt DesLauriers

​

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

​

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

​

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

*/

​

//define variable for angle

let angle = 0;

​

//initiate setup function

function setup() {

  //create scalable canvas depending on window size

  createCanvas(windowWidth, windowHeight);

  //dont fill shapes

  noFill();

  //fill shapes white

  stroke(0);

}

​

//function for window resizing

function windowResized() {

  //resize canvas if window is resized

  resizeCanvas(windowWidth, windowHeight);

  //set background to black

  background(255);

}

​

//initiate draw loop

function draw() {

  //draw background black with an alpha of 25 to create blur trail effect

  background(255, 5);

​

  //move shapes to center of canvas

  translate(width / 2, height / 2);

​

  //set minimum dimension to either width or height depending on which is smaller

  let minDimension = min(width, height);

​

  //set thickness of outline

  strokeWeight(minDimension * 0.05);

​

  //set radius to 1/4 of minimum dimension

  let radius = minDimension * 0.25;

  //set x to the cos of angle and scales it to the radius of the circle

  let x = cos(angle) * radius;

  //set y to the sin of angle and scales it to the radius of the circle, these lines create the rotation of the circle around the center.

  let y = sin(angle) * radius;

​

  //create circle with variables and set to 3/4 of radius.

  circle(x, y, radius * 0.75);

  circle(y, x, radius * 0.75);

  //add 0.02 to angle for each loop.

  angle += 0.05;

}

​