var nb_points = 300;

​

var noiseIntensity = 1.5;

​

var start_pos = 0;

var end_pos = 1920;

​

var start_posh = 0;

var end_posh = 3000;

​

var gaussian = function(x) {

    return Math.exp(-pow(x-width/2,2)/pow(width/5,2));

}

​

var sigmoid = function(x) {

    return 1/(1 + Math.exp(-x));

}

​

​

var transition = function(x) {

    var t1 = Math.abs(x-width/2)/(width/2);

    var t = 1/(0.1+pow(2.2*t1,5));

    return sigmoid(t-3);

}

​

var divisionLine = function(t,start_y) {

    this.y = start_y;

    this.offset = random(100000);

    this.show = function() {

        stroke(255,200);

        fill(0);

        this.addedValue = [];

        this.randomArray = [];

        for(var i = 0;i<nb_points;i++){

             var myRand = random(noiseIntensity);

             var x = i*width/nb_points;

             var myNoise = noise(0.035*x + this.offset,t)+0.47;

             var myNoise2 = - 10*pow(myNoise,5);

             this.addedValue[i] = myRand + myNoise2;

             this.randomArray[i] = myRand;

        }

        var realY = map(this.y,0,400,0,end_posh);

        beginShape();

        vertex(start_pos,realY+4);

        for(var i = 0;i<nb_points;i++){

            myInterpoler = transition(i*width/nb_points);

            vertex(start_pos + i*(end_pos-start_pos)/nb_points,

                 realY +  lerp(this.randomArray[i],this.addedValue[i],myInterpoler));

        }

        vertex(end_pos,realY+4);

        endShape(CLOSE);

        noStroke();

        rect(start_pos-1,realY+2,end_pos-start_pos+2,end_posh + 1 - realY);

    }

}

​

var cnv;

​

var lines = [];

​

var button;

​

function setup() {

  cnv = createCanvas(windowWidth,windowHeight);

  //button = createButton('Generate a new cover');

  //button.mousePressed(new_cover);

  noiseDetail(10);

    new_cover();

}

​

function mousePressed(){

  new_cover();

}

​

function new_cover() {

    for(var i = 0;i<400/6;i++){

    lines[i] = new divisionLine(0,i*6);

  }

  background(0);

  for(var i = 0;i<400/6;i++){

    lines[i].show();

  }

}

​

​

function draw() {

  new_cover();

}

​