var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");
const img = new Image();        
img.src = './napis.png'; 

let i = 0;

function moveText() {
   ctx.clearRect(0, 0, window.innerWidth, 60);
   ctx.drawImage(img, i, 0);
   ctx.drawImage(img, i + window.innerWidth, 0);
   i -= 1;

   if (Math.abs(i) > window.innerWidth){
      i = 0;
   }
};


window.setInterval(moveText,10);