Circle

circle.js

function printGrid(xpos, ypos) {
  var grid = [];

  for (var x = 0; x < 40; x++) {
    grid[x] = [];
    for (var y = 0; y < 100; y++) {
      grid[x][y] = ".";
    }
  }

  grid[Math.round(xpos / 2.5)][Math.round(ypos)] = "o";

  grid.forEach(function(row) {
    console.log(row.join(""));
  });
}

function circle(x, y) {
  var i = 0;

  (function move() {
    i += 0.04;

    var nx = Math.sin(i) * 40 + x;
    var ny = Math.cos(i) * 40 + y;

    printGrid(nx, ny);

    console.log("x:", nx, "\t", "y:", ny);

    setTimeout(move, 24);
  })();
}

circle(50, 50);