Based on p5.js demos by Matt DesLauriers

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

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

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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:

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

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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.

*/

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//define variables

let angle = 0;

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//start setup function

function setup() {

  //make canvas resizable with window

  createCanvas(windowWidth, windowHeight);

  //don't fill objects

  noFill();

  //make outline white

  stroke(0);

}

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//function for when window is resized, it will automatically resize the canvas

function windowResized() {

  //resize the canvas to windowWidth and windowHeight

  resizeCanvas(windowWidth, windowHeight);

}

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//draw loop function

function draw() {

  //set background to black

  background(255);

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  //define minimum size to width or height depending on whats smaller

  let minDimension = min(width, height);

  //set outline thickness

  strokeWeight(minDimension * 0.015 + angle*5);

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  //set the start of the x movement to 1/4 of canvas width

  let xStart = width * 0.15;

  //set the end of the x movement to 3/4 of canvas width

  let xEnd = width * 0.85;

  //set x movement to a sin  of the angle and scale it the window width

  let x = width * 0.5;

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  //set y to half of window height

  let y = (map(sin(angle), -1, 1, xStart, xEnd));

  //set diameter to 3/10 of minimum dimension 

  let diam = minDimension * 0.3;

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  //draw circle

  circle(x, y, diam);

  circle(x+25, y, diam);

   circle(x-25, y, diam);

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  //increase angle

  angle += 0.02;

}

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