Power Blaster

// By Roni Kaufman

// mod by Richard Bourne

​

let kMax;

let step;

let n = 9; // number of blobs

let radius = 0.7; // diameter of the circle

let inter = .8; // difference between the sizes of two blobs

let maxNoise = 9;

let lapse = 0;    // mouse timer

let colorOff = 12;

let noiseProg = (x) => (x);

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  colorMode(HSB, 255);

  angleMode(DEGREES);

  noFill();

  kMax = 3;

  step = 4;

  noStroke();

}

​

function draw() {

  blendMode(BLEND);

  background(255);

  blendMode(DIFFERENCE);

  let t = frameCount;

  for (let i = n; i > 0; i--) {

    let size = radius + i * inter;

    let k, noisiness;

    k = kMax * sqrt(i/n);

    noisiness = maxNoise * noiseProg(i/n);

    fill(t%255, 255, 255)

    blob(size, width/2, height/2, k, t - i * step, noisiness);

    fill((t+20)%255, 255, 255)

    blob(size, width/4, height/3, k, t - i * step + colorOff, noisiness);

    fill((t+40)%255,255,255)

    blob(size, width/2, height/2, k, t - i * step + 2*colorOff, noisiness);

  }

}

​

function blob(size, xCenter, yCenter, k, t, noisiness) {

  beginShape();

  let angleStep = 360 / 14;

  for (let theta = 0; theta <= 360 + 3 * angleStep; theta += angleStep) {

    //let r1 = cos(theta)+1;

    //let r2 = sin(theta)+1;

    let alpha = 7;

    let r = (size + ((tan((theta + t)*alpha) + 1)/4 + (sin((theta + t)*alpha) + 1)/2) * noisiness) * 12;

    let x = xCenter + r * cos(theta);

    let y = yCenter + r * sin(theta);

    curveVertex(x, y);

  }

  endShape();

}

​

function mousePressed(){

// prevents mouse press from registering twice

  if (millis() - lapse > 500){

    save('pix.jpg');

    lapse = millis();

  }

} 

​