​

let y1;

​

let mountains = [];

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  mountains.push(generateMountains(300));

  mountains.push(generateMountains(200));

  mountains.push(generateMountains(100));

}

​

function generateMountains(h){

  let yOff1 = random(1000000);

  let x = 0; 

  let mountain = [];

  while(x <= width){

    e =    1 * noise(1 * h/400 * yOff1) +  1 * noise(2 * h/400 * yOff1) + 0.5 * noise(4 * h/400 * yOff1);

    y1 = pow(e, h/100 * 0.2);

    //y1 = pow(noise(yOff1),3);

    mountain.push(createVector(x,-y1*h));

    x+=1;

    yOff1+=0.002;

  }

  return mountain;

}

​

function drawMountains(mountain){

  push();

  translate(0,height);

  let clr = 255;

  for(let mountain of mountains){

    stroke(clr);

    fill(clr);

    beginShape();

    vertex(0,0);

    for(let m of mountain){

      vertex(m.x,m.y)

    }

    vertex(width,0);

    endShape();

    clr -= 50;

  }

  pop();

}

​

function draw() {

  background(0);

  drawMountains(mountains);

}