What's the Difference?

//まだ四限の授業に取り組んでないので昔のスケッチから

//https://openprocessing.org/sketch/969067

​

let colors = ["#ED5965", "#207393", "#011B36", "#AC79A4", "#6C939A"]

let points = [];//pointsArray

let c = [];//colorArray

let bc;//backColor

​

function setup() {

  createCanvas(1112, 834);

  bc = random(colors);

  background(bc);

  angleMode(DEGREES);

  //blendMode(OVERLAY);

  blendMode(DIFFERENCE);

}

​

function draw() {

  points.push(createVector(width/2, height));

  for(let i = 0; i < points.length; i++){

    let p = points[i];

    let r;

    let cc;

    c.push(random(colors));

    cc = c[i];

    if(random(1)<0.0005){

      r = random(5, 300);

      color(cc).setAlpha(250);

    }else{

      r = 5

      color(cc).setAlpha(5);

    }

    fill(cc);

    noStroke();

    circle(p.x, p.y, r);

  }

  for(let i = 0; i < points.length; i++){

    let x = points[i].x;

    let y = points[i].y;

    points[i].add(p5.Vector.fromAngle(noise(x/800, y/700, frameCount/1000) * 50).mult(5));

  }

}

​

// save jpg

let lapse = 0;    // mouse timer

function mousePressed(){

  // prevents mouse press from registering twice

  if (millis() - lapse > 400){

  save("img_" + month() + '-' + day() + '_' + hour() + '-' + minute() + '-' + second() + ".jpg");

    lapse = millis();

  }

}