Let it rain

robot.js

var robotFound = false;
var direction = 1;

var Robot = function(robot) {
};

Robot.prototype.onIdle = function(ev) {
    var robot = ev.robot;
    if(!robotFound) {
  	  robot.rotateCannon(1 * direction);
    }
  direction = direction * (Math.random() < 0.5 ? 1 : -1);
};

Robot.prototype.onScannedRobot = function(ev) {
    var robot = ev.robot;
		var scanned = ev.scannedRobot;  
  
    robotFound = true;
  if(robot.id !== scanned.parentId
     || robot.parentId !== scanned.id) {
  robot.fire();
  }
  robot.clone();
  var bla = Math.random() * 10;
  robot.turn(bla);
  robot.rotateCannon(-1 * bla);
  robot.ahead(50);
  robotFound = false;
};

Robot.prototype.onHitByBullet = function(ev) {
    var robot = ev.robot;
    robotFound = false;  
    robot.turn(ev.bearing - 90);
    robot.ahead(100);
};

Robot.prototype.onWallCollision = function(ev) {
    var robot = ev.robot;
    robot.turn(ev.bearing - 180);
  	robot.ahead(100);
};