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.

*/

//variable initialization

let angle = 0;

let angle2 = 0;

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//setup initialization

function setup() {

  //resizable canvas

  createCanvas(windowWidth, windowHeight);

  //allows rotation to be set by degrees

  angleMode(DEGREES);

  //fill shapes white

  fill(255);

}

​

//start draw loop

function draw() {

  //set default color blend mode

  blendMode(BLEND);

  //background set to black

  background(255);

  //change blend mode to difference between two colors overlapping

  blendMode(DIFFERENCE);

​

  //define x and y variable to center of screen

  let x = width / 2;

  let y = height / 2;

​

  //define variable for minimum sizing of objects to be the width or height of the screen

  let minDimension = min(width, height);

  //define variable for spacing to set size of shapes within resizable canvas

  let spacing = minDimension / 12;

​

  //draw circle with spacing offset and size set to 4x the minimum dimension

  circle(x - spacing, y - spacing, spacing * 2);

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  //draw triangle with spacing offsets applied

  triangle(

    x - spacing,

    y - spacing * 6,

    x - spacing,

    y + spacing,

    x - spacing * 6,

    y + spacing

  );

  //save the current settings

  push();

  //move shapes to center

  translate(x, y);

  //rotate square by angle

  rotate(angle);

  //make rectangle from center point

  rectMode(CENTER);

  //make square and set sizing 4x minimum dimension

  square(0, 0, spacing * 6);

  square(20, 0, spacing * 6);

  //rotate square +0.5 per loop

  angle -= 0.5;

  //reset to original state

  pop();

}

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