<canvas width="600" height="400"></canvas>
<script>
var pantalla=document.querySelector("canvas");
var pincel=pantalla.getContext("2d");
var colores=["blue","red","green"] ;
var indice=0;
pincel.fillStyle="lightgrey";
pincel.fillRect(0,0,600,400);
function disenharCirculo(x,y,radio){
pincel.fillStyle="blue";
pincel.beginPath();
pincel.arc(x,y,radio,0,2*Math.PI)
pincel.fill();
}
function limpiarPantalla(){
pincel.clearRect(0,0,600,400);
}
//disenharCirculo(x,20,20)
var x=0;
function actualizarPantalla(){
limpiarPantalla()
disenharCirculo(x,20,20);
x++
}
setInterval(actualizarPantalla,100);
</script>
