这篇文章将引导您使用 TomTom Maps API 创建乘车请求应用程序。该应用程序将允许用户输入多个上车和下车地点，计算最佳路线并将其显示在地图上。我们将涵盖从获取 API 密钥到在地图上渲染优化路线的所有内容。

第 1 步：设置 TomTom API
在深入研究代码之前，您需要在 TomTom 开发人员门户上注册并获取 API 密钥。此密钥将允许您访问 TomTom 的服务，例如路线、地理编码和地图。

第 2 步：实现乘车请求功能
该应用程序的核心包括收集地址、将其转换为坐标并计算最佳路线。具体方法如下：

def ride_request(request):
    if request.method == 'POST':
        form = RideForm(request.POST)
        if form.is_valid():
            ride = form.save(commit=False)
            # Get coordinates for the pickup and drop locations
            pickup_coords = get_coordinates(ride.pickup_address)
            pickup_coords_1 = get_coordinates(ride.pickup_address_1)
            pickup_coords_2 = get_coordinates(ride.pickup_address_2)
            drop_coords = get_coordinates(ride.drop_address)

            # Ensure all coordinates are available
            if all([pickup_coords, pickup_coords_1, pickup_coords_2, drop_coords]):
                # Set the coordinates
                ride.pickup_latitude, ride.pickup_longitude = pickup_coords
                ride.pickup_latitude_1, ride.pickup_longitude_1 = pickup_coords_1
                ride.pickup_latitude_2, ride.pickup_longitude_2 = pickup_coords_2
                ride.drop_latitude, ride.drop_longitude = drop_coords

                # Save the ride and redirect to the success page
                try:
                    ride.save()
                    return redirect('success_page', pickup_lon=ride.pickup_longitude, pickup_lat=ride.pickup_latitude,
                                    pickup_lon_1=ride.pickup_longitude_1, pickup_lat_1=ride.pickup_latitude_1,
                                    pickup_lon_2=ride.pickup_longitude_2, pickup_lat_2=ride.pickup_lat_2,
                                    drop_lon=ride.drop_longitude, drop_lat=ride.drop_latitude)
                except IntegrityError as e:
                    messages.error(request, f'IntegrityError: {str(e)}')
            else:
                messages.error(request, 'Error getting coordinates. Please try again.')
    else:
        form = RideForm()

    return render(request, 'maps/ride_request.html', {'form': form})

在此代码片段中，应用程序接受用户输入的多个地址，使用 get_coordinates 函数将这些地址转换为坐标，并保存数据以供以后使用。

def get_coordinates(address):
    """
    Get coordinates (latitude, longitude) for a given address using TomTom Geocoding API.
    """
    api_key = 'YOUR_TOMTOM_API_KEY'
    base_url = 'https://api.tomtom.com/search/2/geocode/{address}.json'

    # Prepare the URL with the address and API key
    url = base_url.format(address=address)
    params = {'key': api_key}

    # Make the request to TomTom Geocoding API
    response = requests.get(url, params=params)
    data = response.json()

    # Check if the request was successful
    if response.status_code == 200 and data.get('results'):
        # Extract coordinates from the response
        result = data['results'][0]
        if 'position' in result:
            coordinates = result['position']
            return coordinates.get('lat'), coordinates.get('lon')
        else:
            print(
                f"Error getting coordinates for {address}: 'position' key not found in the response.")
            return None
    else:
        # Handle errors or return a default value
        print(
            f"Error getting coordinates for {address}: {data.get('message')}")
        return None

第三步：计算优化路线
获得坐标后，下一步就是计算优化路线。 TomTom 的 Waypoint Optimization API 有助于确定多个点之间最有效的路径。

def get_optimized_route(*pickup_coords, drop_coords):
    api_key = 'YOUR_TOMTOM_API_KEY'

    # Prepare the payload for the API
    payload = {
        'waypoints': [{'point': {'latitude': lat, 'longitude': lon}} for lon, lat in pickup_coords],
        'options': {'travelMode': 'car'},
    }

    # Add the drop location to the waypoints
    payload['waypoints'].append({'point': {'latitude': drop_coords[1], 'longitude': drop_coords[0]}})

    # API request
    response = requests.post(f'https://api.tomtom.com/routing/waypointoptimization/1',
                             params={'key': api_key},
                             json=payload)

    if response.status_code == 200:
        data = response.json()
        if 'optimizedOrder' in data:
            # Extract the optimized route
            return [get_route_geometry(pickup_coords[i], pickup_coords[j]) 
                    for i, j in zip(data['optimizedOrder'], data['optimizedOrder'][1:])]
    return None

此函数向 TomTom API 发送请求，接收路径点的优化顺序，然后计算路线几何形状。

第 4 步：渲染地图和路线
最后，获得优化的路线数据后，就可以在 success_page.html 上渲染地图了。

{% load static %}



    

        

    
    
    

此 HTML 代码初始化 TomTom 地图，在上车点和下车点上放置标记，并绘制它们之间的路线。

结果：乘车申请表和成功地图

注意：上面提供的代码是一个简化的示例，用于演示使用 TomTom 的 API 叫车和计算路线的基本功能。实际的实现可能有所不同，并包括基于特定要求的附加功能或变化。更多详细信息和高级使用方法，请参考TomTom官方开发者文档。