151 lines
5.9 KiB
Python
151 lines
5.9 KiB
Python
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import random
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import math
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from ninja import Router
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from django.utils import timezone
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from datetime import timedelta
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from system.models import GpsStatus, ShipLatestStatus, MessageFlag
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from fuadmin.settings import OWN_SHIP_MMSI
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router = Router()
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def haversine(lat1, lon1, lat2, lon2):
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"""计算两点间的大圆距离（公里）"""
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R = 6371 # 地球半径(公里)
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# 将角度转换为弧度
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lat1, lon1, lat2, lon2 = map(math.radians, [lat1, lon1, lat2, lon2])
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# 差值
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dlat = lat2 - lat1
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dlon = lon2 - lon1
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# Haversine公式
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a = math.sin(dlat/2)**2 + math.cos(lat1) * math.cos(lat2) * math.sin(dlon/2)**2
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c = 2 * math.atan2(math.sqrt(a), math.sqrt(1-a))
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return R * c
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def calculate_relative_bearing(own_lat, own_lon, own_course, target_lat, target_lon):
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"""
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计算目标点相对本船航向的方向角（相对方位，单位°，0~360，顺时针）
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"""
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d_lon = math.radians(target_lon - own_lon)
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lat1 = math.radians(own_lat)
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lat2 = math.radians(target_lat)
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x = math.sin(d_lon) * math.cos(lat2)
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y = math.cos(lat1)*math.sin(lat2) - math.sin(lat1)*math.cos(lat2)*math.cos(d_lon)
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initial_bearing = math.atan2(x, y)
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initial_bearing_deg = (math.degrees(initial_bearing) + 360) % 360 # 转换为 0~360 度
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# 相对航向（目标相对于本船正前的角度）
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relative_bearing = (initial_bearing_deg - own_course + 360) % 360
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return relative_bearing
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@router.get("/header")
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def get_header_info(request):
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# 固定本船MMSI
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ownship_mmsi = OWN_SHIP_MMSI
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# current_time = datetime.now()
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# current_date = current_time.strftime('%Y-%m-%d')
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# current_time_str = current_time.strftime('%H:%M')
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# # 检查是否是第一次调用，如果是则初始化位置
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# if not hasattr(get_header_info, 'ship_data'):
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# # 初始位置 (30.9918, 122.2788)
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# get_header_info.ship_data = {
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# 'mmsi': ownship_mmsi,
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# 'latitude': 30.9918,
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# 'longitude': 122.2788,
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# 'speed': 12.0,
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# 'course': 45,
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# 'date': current_date,
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# 'time': current_time_str
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# }
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# else:
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# # 更新位置和航向
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# get_header_info.ship_data['latitude'] = round(get_header_info.ship_data['latitude'] + 0.001, 4)
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# get_header_info.ship_data['longitude'] = round(get_header_info.ship_data['longitude'] + 0.001, 4)
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# get_header_info.ship_data['course'] = round((get_header_info.ship_data['course'] + 5) % 360, 1)
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# get_header_info.ship_data['date'] = current_date
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# get_header_info.ship_data['time'] = current_time_str
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# # 将数据保存到GpsStatus模型
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# GpsStatus.objects.create(
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# utc_time=current_time,
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# longitude=get_header_info.ship_data['longitude'],
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# latitude=get_header_info.ship_data['latitude'],
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# altitude=0.0, # 固定值
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# used_satellites=10, # 固定值
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# gps_satellites=6, # 固定值
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# beidou_satellites=4, # 固定值
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# gps_status=1, # 固定值，1表示正常
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# fix_mode=3, # 固定值，3表示3D定位
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# hdop=1.2, # 固定值
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# speed=get_header_info.ship_data['speed'],
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# direction=get_header_info.ship_data['course']
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# )
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#查询最新经纬度数据
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latest_gps = GpsStatus.objects.order_by('-utc_time').first()
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# 计算 10 分钟前的时间，基于 GpsStatus 中的时间
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ten_minutes_ago = latest_gps.utc_time - timedelta(minutes=10)
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# 筛选出 10 分钟内的船只记录
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recent_ships = ShipLatestStatus.objects.filter(timestamp__gte=ten_minutes_ago)
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closest_ship = None
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min_distance_km = float('inf')
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for ship in recent_ships:
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# 计算本船与当前船只的距离（公里）
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distance_km = haversine(latest_gps.latitude, latest_gps.longitude, ship.latitude, ship.longitude)
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if distance_km < min_distance_km:
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min_distance_km = distance_km
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closest_ship = ship
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# 判断是否小于 5 海里（1 海里 = 1.852 公里）
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warning_message = ''
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# min_distance_km = random.randint(1, 20)
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print(min_distance_km)
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if 3 * 1.852 < min_distance_km < 5 * 1.852:
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warning_message = '注意，5海里范围内有其他船只'
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print(warning_message)
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elif min_distance_km <= 3 * 1.852:
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relative_bearing = calculate_relative_bearing(
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latest_gps.latitude,
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latest_gps.longitude,
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latest_gps.direction, # 本船航向
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closest_ship.latitude,
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closest_ship.longitude
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)
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warning_message = f'警告：有船靠近，相对方位 {relative_bearing:.1f}°，相距 {min_distance_km / 1.852:.2f} 海里， 速度{closest_ship.speed}节'
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else:
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warning_message = '保持正常航行'
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flag = MessageFlag.objects.first()
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has_message = flag.has_new_message
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if has_message:
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flag.has_new_message = False
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flag.save()
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return {
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'mmsi': ownship_mmsi, # 固定本船MMSI
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'latitude': latest_gps.latitude,
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'longitude': latest_gps.longitude,
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'speed': latest_gps.speed,
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'course': latest_gps.direction,
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'date': latest_gps.utc_time.strftime('%Y-%m-%d'),
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'time': latest_gps.utc_time.strftime('%H:%M'),
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"satelliteCount": random.randint(0, 12),
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"messageCount": 12,
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"reminderCount": random.randint(0, 20),
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"alertCount": random.randint(0, 15),
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"approachingCount": random.randint(0, 5),
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"trackStatus": False,
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"gpsSignal": round(random.uniform(0, 5), 1),
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"beidouSignal": round(random.uniform(0, 5), 1),
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"vdesSignal": round(random.uniform(0, 5), 1),
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"warning_message": warning_message,
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"is_receive_vdes_data": has_message
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}
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# return get_header_info.ship_data
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