import numpy as np

class Conversions:
  #Speed
  MPH_TO_KPH = 1.609344
  KPH_TO_MPH = 1. / MPH_TO_KPH
  MS_TO_KPH = 3.6
  KPH_TO_MS = 1. / MS_TO_KPH
  MS_TO_MPH = MS_TO_KPH * KPH_TO_MPH
  MPH_TO_MS = MPH_TO_KPH * KPH_TO_MS
  MS_TO_KNOTS = 1.9438
  KNOTS_TO_MS = 1. / MS_TO_KNOTS
  #Angle
  DEG_TO_RAD = np.pi/180.
  RAD_TO_DEG = 1. / DEG_TO_RAD
  #Mass
  LB_TO_KG = 0.453592


RADAR_TO_CENTER = 2.7   # (deprecated) RADAR is ~ 2.7m ahead from center of car
RADAR_TO_CAMERA = 1.52   # RADAR is ~ 1.5m ahead from center of mesh frame

class UIParams:
  lidar_x, lidar_y, lidar_zoom = 384, 960, 6
  lidar_car_x, lidar_car_y = lidar_x/2., lidar_y/1.1
  car_hwidth = 1.7272/2 * lidar_zoom
  car_front = 2.6924 * lidar_zoom
  car_back = 1.8796 * lidar_zoom
  car_color = 110