/// <summary>
/// 插入点
/// </summary>
/// <param name="line"></param>
public void InsertForword(LinkedLine line)
{
if (this.Next != null)
{
this.Next.Pre = line;
line.Next = this.Next;
}
this.Next = line;
line.Pre = this;
}
/// <summary>
/// 查找到指定段线之前有多少节
/// </summary>
/// <param name="line"></param>
/// <returns></returns>
public int CountToLine(LinkedLine line)
{
int i = 1;
var cu = this;
while (cu.Next != null && cu.Next != line)
{
i++;
cu = cu.Next;
}
i++;
return(i);
}
/// <summary>
/// 向前连接
/// </summary>
/// <param name="line"></param>
public void LinkForword(LinkedLine line)
{
this.Next = line;
line.Pre = this;
}
/// <summary>
/// 从上一次参与计算的参考线段到现在为止查找交点
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
/// <param name="minK">上一格网点在哪个参考线上求的</param>
/// <param name="crossK"></param>
/// <param name="crossLine">与具体哪根参考线有交点</param>
/// <returns></returns>
public bool TryGetCross(double a, double b, double minK, double maxK, out double crossK, out LinkedLine crossLine)
{
//标记在哪个线段上求交的
crossLine = this;
crossK = (b - this.B) / (this.A - a);
if (crossK >= StartK && crossK < maxK)
{
return(true);
}
if (Math.Abs(crossK - StartK) < 1e-15 || Math.Abs(crossK - maxK) < InvaluedValue)
{
return(true);
}
while (crossLine.Pre != null && crossLine.Pre.EndK >= minK)
{
crossLine = crossLine.Pre;
crossK = (b - crossLine.B) / (crossLine.A - a);
if (crossK >= crossLine.StartK && crossK <= crossLine.EndK)
{
return(true);
}
if (Math.Abs(crossK - crossLine.StartK) < 1e-15 || Math.Abs(crossK - crossLine.EndK) < InvaluedValue)
{
return(true);
}
}
return(false);
}