function LimitAngle(angle){
	if(angle>2*math.pi)
		return angle-2*math.pi
	else if (angle<0)
		return angle+2*math.pi
	else
		return angle
}

function LimitSpeed(vel_vec, factor){
  if(math.vec2.length(vel_vec)>GOTO_MAXVEL*factor)
  	vel_vec = math.vec2.scale(vel_vec, GOTO_MAXVEL*factor/math.vec2.length(vel_vec))
	return vel_vec
}

# TODO: add other conversions....
function convert_path(P) {
    var pathR={}
    if(V_TYPE == 0) {
        var n = 1
        while(n <= size(P)){
          pathR[n] = {}
          var tmpgoal = gps_from_vec(math.vec2.sub(getvec(P,n),cur_cell))
          pathR[n][1]=tmpgoal.latitude
          pathR[n][2]=tmpgoal.longitude
          n = n + 1
        }
    }
    return pathR
}

# TODO: add other conversions....
function convert_pt(in) {
    if(V_TYPE == 0)
        return vec_from_gps(in.x, in.y, 0)
}

function vec_from_gps(lat, lon, home_ref) {
  d_lon = lon - pose.position.longitude
  d_lat = lat - pose.position.latitude
  if(home_ref == 1) {
	  d_lon = lon - homegps.long
	  d_lat = lat - homegps.lat
  }
  ned_x = d_lat/180*math.pi * 6371000.0;
  ned_y = d_lon/180*math.pi * 6371000.0 * math.cos(lat/180*math.pi);
	#Lgoal.range = math.sqrt(ned_x*ned_x+ned_y*ned_y);
	#Lgoal.bearing = LimitAngle(math.atan(ned_y,ned_x));
  return math.vec2.new(ned_x,ned_y)
}

function gps_from_vec(vec) {
  Lgoal = {.latitude=0, .longitude=0}
  Vrange = math.vec2.length(vec)
  Vbearing = LimitAngle(math.atan(vec.y, vec.x))
#  print("rb2gps: ",Vrange,Vbearing, pose.position.latitude, pose.position.longitude)
  latR = pose.position.latitude*math.pi/180.0;
  lonR = pose.position.longitude*math.pi/180.0;
  target_lat = math.asin(math.sin(latR) * math.cos(Vrange/6371000.0) + math.cos(latR) * math.sin(Vrange/6371000.0) * math.cos(Vbearing));
  target_lon = lonR + math.atan(math.sin(Vbearing) * math.sin(Vrange/6371000.0) * math.cos(latR), math.cos(Vrange/6371000.0) - math.sin(latR) * math.sin(target_lat));
  Lgoal.latitude = target_lat*180.0/math.pi;
  Lgoal.longitude = target_lon*180.0/math.pi;
  #d_lat = (vec.x / 6371000.0)*180.0/math.pi;
  #goal.latitude = d_lat + pose.position.latitude;
  #d_lon = (vec.y / (6371000.0 * math.cos(goal.latitude*math.pi/180.0)))*180.0/math.pi;
  #goal.longitude = d_lon + pose.position.longitude;

  return Lgoal
}