public static Position GetPosition(this Location source, double distance)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
return(LocationUtility.GetPosition(source, distance));
}
public static double GetDistance(this Location source, double latitude, double longitude)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
return(LocationUtility.GetDistance(source.Latitude, source.Longitude, latitude, longitude));
}
public static double GetDistance(this Location source, Location target)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
if (target == null)
{
throw new ArgumentNullException("target");
}
return(LocationUtility.GetDistance(source, target));
}
/// <summary>
/// 监测指定的位置点 <paramref name="source"/> 是否在位置 <paramref name="target"/> 的指定公里范围内。
/// </summary>
/// <param name="source">位置点。</param>
/// <param name="target">目标位置点。</param>
/// <param name="distance">目标范围(公里)</param>
/// <returns>如果在指定的范围内则为true，否则为false。</returns>
public static bool IsInRange(Location source, Location target, double distance)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
if (target == null)
{
throw new ArgumentNullException("target");
}
// 计算目标位置的四个顶点。
var position = LocationUtility.GetPosition(target, distance);
return(source.Latitude < position.LeftTop.Latitude && source.Latitude > position.RightBottom.Latitude && source.Longitude > position.LeftTop.Longitude && source.Longitude < position.RightBottom.Longitude);
}
public static bool IsInRange(this Location source, double latitude, double longitude, double distance)
{
return(LocationUtility.IsInRange(source, new Location(latitude, longitude), distance));
}
public static bool IsInRange(this Location source, Location target, double distance)
{
return(LocationUtility.IsInRange(source, target, distance));
}
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
{
return(LocationUtility.Parse(value as string));
}
