vehicle_class_json_creator.py

### Run this program to create json file that contains label of each vehicle type in CARLA
### The JSON file is required to get vehicle's ground truth class when using carla_vehicle_annotator function

### Set this variable to True if you want the program to give label 0 to every vehicle type
autoFill = False

### This dictionary contains definitions of each label
class_ref = {
    "passenger_car" : 0,
    "truck" : 1,
    "motorcycle" : 2,
    "bicycle" : 3,
    "others" : 9
}


import glob
import os
import sys

try:
    sys.path.append(glob.glob('../carla/dist/carla-*%d.%d-%s.egg' % (
        sys.version_info.major,
        sys.version_info.minor,
        'win-amd64' if os.name == 'nt' else 'linux-x86_64'))[0])
except IndexError:
    pass

import carla

import math
import random
import json


def get_transform(vehicle_location, angle, d=6.4):
    a = math.radians(angle)
    location = carla.Location(d * math.cos(a), d * math.sin(a), 2.0) + vehicle_location
    return carla.Transform(location, carla.Rotation(yaw=180 + angle, pitch=-15))


def main():
    client = carla.Client('localhost', 2000)
    client.set_timeout(10.0)
    world = client.get_world()
    spectator = world.get_spectator()
    vehicle_blueprints = world.get_blueprint_library().filter('vehicle')

    location = random.choice(world.get_map().get_spawn_points()).location
    vehicle_dict = {}
    for blueprint in vehicle_blueprints:
        transform = carla.Transform(location, carla.Rotation(yaw=-45.0))
        vehicle = world.spawn_actor(blueprint, transform)
        try:
            spectator.set_transform(get_transform(location, -30))
            if autoFill:
                x = 0
                print(str(vehicle.type_id) + ' class ' + str(x))
            else:
                x = input(str(vehicle.type_id) + ' class? (must be integer) ')
                x = int(x)
            vehicle_dict[str(vehicle.type_id)] = x
        finally:

            vehicle.destroy()
    json_dict = {
        'reference' : class_ref,
        'classification' : vehicle_dict
    }
    with open('vehicle_class_json_file.txt', 'w+') as outfile:
        json_file = json.dump(json_dict, outfile, indent=4)
    
if __name__ == '__main__':

    main()