let c=0; 

let x=0;

let y=0;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  background (220);

  textSize(30);

  frameRate(20);

}

​

function draw() {

  if(frameCount %60 ==1){

    let character = str.charAt(floor(c));

    let w = textWidth(character);

    let h = textAscent() + textDescent();

    if( x > width - w) {

      x = 0;

      y += textAscent() + textDescent();

    }

    // Draw the character to the canvas

    text(character, x, random(height - h));

    // Shift over to the right

    x += w;

    // Advance to the next cahracter

    c++;

    c%=str.length;

  }

}