CRUSHER

robot.js

var MAX_SPEED = 100;
var DISTANCE = 50;
//FightCode can only understand your robot
//if its class is called Robot
var Robot = function(robot) {
  this.dir = 1;
  this.cannonDir = 1;
  this.speed = MAX_SPEED*.8;
  this.ts = 0;
  this.pivot = {
    x:robot.arenaWidth/2, 
    y:robot.arenaHeight/2,
    ang: 0,
    d: 0
  };
  this.recalculateDistance({robot:robot});
  this.keepDistance({robot: robot}, 100);  
};
Robot.prototype.onIdle = function(ev) {
    var robot = ev.robot;
  	var now = new Date().getTime();
  	//if (now > this.pivot.ts + 1000) {
    	robot.rotateCannon(this.cannonDir * 90);
    //}
  	//this.doMove(ev);
  	/*
  	if (Math.random()>0.5) {
  		robot.ahead(50);
  	}
  	else {
    	robot.back(50);
  	}
    */
};

function closestAngle(a, b) {
  	if (Math.abs(b-a) < 180) {
      return b-a;
  	}
  	if (b>a) {
      	return b-a-180;
  	}
  	return b-a+180;
};
Robot.prototype.doMove = function(ev) {
  	var robot = ev.robot;
  	this.speed += (this.speed - (MAX_SPEED/2))/8;
  	var dist = this.speed * this.dir;
  	if (dist > 0) {
  		robot.ahead(dist);
    } else {
      robot.back(-dist);
    }
  	this.recalculateDistance(ev); 
};
Robot.prototype.orientTowardsPivot = function(ev) {
    var robot = ev.robot;
  	var dang = -closestAngle(this.pivot.ang, robot.angle);
  	this.turn(ev,dang);
}; 
Robot.prototype.keepDistance = function(ev, distance) {
  	var robot = ev.robot;
  	var d = this.pivot.d - distance;

  	console.log(d, distance);
  	this.orientTowardsPivot(ev);
  	if (d > 50) {
  		this.turn(ev, this.cannonDir*90);
  		robot.ahead(50);
    }
  	else if (d < -50) {
  		this.turn(ev, -this.cannonDir*90);
  		robot.back(50);
  	}
  	this.orientTowardsPivot(ev);
  	robot.ahead(50); 
    
};
Robot.prototype.recalculateDistance = function(ev) {
  	var robot = ev.robot;
  	var dx = this.pivot.x - robot.position.x;
  	var dy = this.pivot.y - robot.position.y;
  	this.pivot.d = Math.sqrt(dx*dx+dy*dy);
  	this.pivot.ang = (Math.atan2(dy, dx) / Math.PI) * 180;
};


Robot.prototype.scan = function(ev) {
  	this.pivot.x = ev.scannedRobot.position.x;
  	this.pivot.y = ev.scannedRobot.position.y;
  	//this.pivot.ts = (new Date()).getTime();
  	this.recalculateDistance(ev);
};
Robot.prototype.onScannedRobot = function(ev) {
    var robot = ev.robot;
  	
  	this.scan(ev);
  	if (this.pivot.d < 300) {
      /*
      if (robot.gunCooldownTime) {
        return robot.stop();
      }
      */
    	robot.fire();
  	}
  	this.keepDistance(ev, DISTANCE);
		//this.doMove(ev);
};
Robot.prototype.turn = function(ev, ang) {
  var robot = ev.robot;
  robot.turn(ang);
  var cannonAngle = -90+closestAngle(this.pivot.ang, robot.cannonAbsoluteAngle);
  robot.rotateCannon(cannonAngle);
  this.cannonDir = cannonAngle > 0 ? 1 : -1;
}

Robot.prototype.onHitByBullet = function(ev) {
  	return;
    var robot = ev.robot;
    robot.stop();
  	this.dir *= -1;
  	this.speed = MAX_SPEED;
  	if (robot.gunCoolDownTime) {
      this.doMove(ev);
  	}
  	if (robot.life < 80 && robot.availableClones) {
      robot.clone();
      robot.stop();
      robot.ahead(50);
  	}
};

Robot.prototype.onWallCollision = function(ev) {
		return;
  	var robot = ev.robot;
  	robot.stop(); 
  	this.dir *= -1;
  	this.turn(ev, ev.bearing);
  	robot.back(50);
  	this.recalculateDistance(ev);
};