/// <summary>
/// 为了增强索引，将线的Envelop扩大
/// </summary>
/// <returns>增强后的Envelop</returns>
public Envelope GetOptimizeEnvelop()
{
//这要有一个优化逻辑，如果接近90度或者0度的话需要增加rectangle
double direction = UsefulUtility.RadianToDegree(Angle);
if (Math.Abs(direction - 90) < threhold)
{
double stlo = 0f, edlo = 0f;
//表示垂直的情况,小的经度更小，大的经度更大
if (P0.X < P1.X)
{
stlo = P0.X - extension;
edlo = P1.X + extension;
}
else
{
stlo = P0.X + extension;
edlo = P1.X - extension;
}
return(new Envelope(stlo, edlo, P0.Y, P1.Y));
}
else if ((90 - Math.Abs(direction - 90)) < threhold)
{
double stla = 0, edla = 0;
if (P0.Y < P1.Y)
{
stla = P0.Y - extension;
edla = P1.Y + extension;
}
else
{
stla = P0.Y + extension;
edla = P1.Y - extension;
}
return(new Envelope(P0.X, P1.X, stla, edla));
}
return(new Envelope(P0.X, P1.X, P0.Y, P1.Y));
}
public double DistanceToOtherPointOnEarth(Coordinate c)
{
return(UsefulUtility.DistanceOnEarth(this, c));
}