如何使用Xamarin.Forms.GoogleMaps将地图的纬度和经度转换为像素坐标？

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:xamarinFormsMaps="clr-namespace:Xamarin.Forms.GoogleMaps;assembly=Xamarin.Forms.GoogleMaps"
             x:Class="YourNamespace.YourPage">
    <xamarinFormsMaps:Map
        x:Name="googleMap"
        MapType="Street"
        IsShowingUser="true"
        VerticalOptions="FillAndExpand"
        HorizontalOptions="FillAndExpand" />
</ContentPage>

using Xamarin.Forms;
using Xamarin.Forms.GoogleMaps;

namespace YourNamespace
{
    public partial class YourPage : ContentPage
    {
        public YourPage()
        {
            InitializeComponent();
        }

        protected override void OnAppearing()
        {
            base.OnAppearing();

            var projection = googleMap.Projection;
            var location = new Position(latitude, longitude);
            var pixelCoordinates = projection.ToScreenLocation(location);

            // 使用像素坐标进行后续操作
            // ...
        }
    }
}