function initializeKeyboardEvents()

// *** No need to edit this page

// Must be called from an Initializationpage to make
// the game responsive to keyboard events
function initializeKeyboardEvents() {
  // keyboard press down event
  window.onkeydown = function(event) {
    var char = getKey(event || window.event);
    console.log ("You pressed char="+char);
    if (running) {
      switch(char) {
        case 37 : moveSpriteTo(LEFT_MOVE);  event.preventDefault(); event.stopPropagation(); break;
        case 38 : moveSpriteTo(UP_MOVE);    event.preventDefault(); event.stopPropagation(); break;
        case 39 : moveSpriteTo(RIGHT_MOVE); event.preventDefault(); event.stopPropagation(); break;
        case 40 : moveSpriteTo(DOWN_MOVE);  event.preventDefault(); event.stopPropagation(); break;
      }
    }
    return _isPaused;
  };
}

// get character; event.type must be keypress
// this is used for the keyboard control
function getCharKey(event) {
  if (event.which === null) {
    return event.keyCode; // IE
  } else if (event.which!==0 && event.charCode!==0) {
    return event.which;   // other browsers
  } else {
    return -1; // special key
  }
}

// get character; event.type must be keydown
// this is used for the keyboard control
// and allows for pressing down arrows
function getKey(event) {
  return event.keyCode; // IE
}