var x = document.getElementById("myCanvas");
var y = x.getContext("2d");

function drawSquare(left, top, size) {
  y.strokeStyle = "#AF1E2C";
  y.strokeRect(left, top, size, size);
}

drawSquare(0, 0, 100);
drawSquare(100, 0, 100);
drawSquare(200, 0, 100);