public static void SaveTimerValue(List<TimeSpan> items)
{
if( items.Count == 0 )
{
return;
}
File.WriteAllLines(outputValueFileName, items.Select(c => c.ToString(@"hh\:mm\:ss")));
}
/// <summary>
/// 用于获得交点进出性的切割函数
/// </summary>
/// <param name="v1"></param>
/// <param name="v2"></param>
/// <param name="list"></param>
/// <param name="line2Idx"> </param>
/// <returns></returns>
private static Tuple<CrossInOut, int, bool> CutByLineForCrossDi(VertexBase v1, VertexBase v2, List<VertexBase> list, bool withIdx, int line2Idx = 0)
{
bool hasIntersection = false;
bool smallToBig = true;
var crossXsmaller = new List<IntersWithIndex>();
var crossXbigger = new List<IntersWithIndex>();
var slope = (v2.Y - v1.Y) / (v1.X - v2.X);
var minX = v1.X;
var maxX = v2.X;
if (v1.X > v2.X)
{
minX = v2.X;
maxX = v1.X;
smallToBig = false;
}
//错切后的切割多边形
var shearedPolyC = list.Select(r => new Vertex(r.X, r.X * slope + r.Y) { Name = r.Name }).ToList();
//把实体多边形的第一条边（即切线）错切后得到一条水平直线
var y = v1.X * slope + v1.Y;
for (var toCutLineStart = 0; toCutLineStart < list.Count; toCutLineStart++)
{
var c1 = shearedPolyC[toCutLineStart % list.Count];//注意，不要漏了文档中C4->C1这种结尾的线段
var c2 = shearedPolyC[(toCutLineStart + 1) % list.Count];
// 重合
if (c1.Y == c2.Y && c1.Y == y) continue;
//不相交
if (c1.Y > y && c2.Y > y) continue;
if (c1.Y < y && c2.Y < y) continue;
var x = LineCrossH(y, c1, c2);
var npy = y - x * slope;
if (!hasIntersection)
if ((x > minX && x < maxX) ||
(c2.Y == y && x == v2.X) ||
(x == minX && c1.Y != y && c2.Y != y) ||
(x == maxX && c1.Y != y && c2.Y != y)
)
hasIntersection = true;
var inters = new IntersWithIndex(x, npy, toCutLineStart);
if (smallToBig)
{
if (x < minX) crossXsmaller.Add(inters);
if ((x > minX && x < maxX) ||
(x == minX && c2.Y == y) ||
(x == minX && c1.Y != y && c2.Y != y) ||
(x == maxX && c2.Y == y) ||
(x == maxX && c1.Y != y && c2.Y != y) ||
(x > maxX) //这个必不可少，不然影响进出性判断
)
crossXbigger.Add(inters);
}
else
{
if (x > maxX) crossXsmaller.Add(inters);
if ((x > minX && x < maxX) ||
(x == maxX && c2.Y == y) ||
(x == maxX && c1.Y != y && c2.Y != y) ||
(c2.Y == y && x == minX) ||
(x == minX && c1.Y != y && c2.Y != y) ||
(x < minX) //这个必不可少，不然影响进出性判断
)
crossXbigger.Add(inters);
}
}
if (!hasIntersection) return Tuple.Create(CrossInOut.In, 0, false);
if (smallToBig)
crossXbigger.Sort((p1, p2) => p1.X.CompareTo(p2.X));
else
crossXbigger.Sort((p1, p2) => -(p1.X.CompareTo(p2.X)));
var count = crossXbigger.Count;
CrossInOut crossRet;
int cuttedLineIdx;
if (withIdx)//切割多边形的一条边去切实体多边形的一条边
{
int countSkip = 0;
for (; ; countSkip++)
{
if (crossXbigger[countSkip].Idx == line2Idx)//line2Idx确定了实体多边形的这条边
break;
}
count += countSkip;
crossRet = count % 2 == 0 ? CrossInOut.In : CrossInOut.Out;
cuttedLineIdx = crossXbigger[countSkip].Idx;
}
else//实体多边形的一条边去切切割多边形
{
crossRet = count % 2 == 0 ? CrossInOut.In : CrossInOut.Out;
cuttedLineIdx = crossXbigger[0].Idx;
}
return Tuple.Create(crossRet, cuttedLineIdx, true);
}
// 传入的多边形的点需要封闭，即首尾点要相同
public static List<List<VertexBase>> Cut(List<VertexBase> listS, List<VertexBase> listC)
{
//如果是浮点数，使用这个处理保证相等比较正确
PrepareVertex(listS);
PrepareVertex(listC);
int cutStartIdx = 0;//实际切割由这个idx起始即可
// 阶段1： 这个循环中的切割用于判断方向
// 如果这步中没有发现交点，则进入不相交多边形的处理
for (; cutStartIdx < listS.Count; cutStartIdx++)
{
//用实体多边形的一条边去切切割多边形
var s1 = listS[cutStartIdx % listS.Count];
var s2 = listS[(cutStartIdx + 1) % listS.Count];
Tuple<CrossInOut, int, bool> ret;
if (s1.X == s2.X)
ret = CutByLineVerticalForCrossDi(s1, s2, listC, false);
else
ret = CutByLineForCrossDi(s1, s2, listC, false);
//如果没有交点，继续下一条边。
if (!ret.Item3) continue;
var interDirect1 = ret.Item1;//交点对于切割多边形的进出性
var cutLineIdx = ret.Item2;//交点所在的切割多边形的边的起点的索引，用于在使用切割多边形边去切实体多边形时，确定那条边
WindowLog.Default.Log("得到S多边形边{0}{1}切割C多边形{2}{3}产生的交点，对于S进出性为{4}", s1.Name, s2.Name,
listC[cutLineIdx % listC.Count].Name,
listC[(cutLineIdx + 1) % listC.Count].Name,
interDirect1 == CrossInOut.In ? "进" : "出");
//用切割多边形的一条边(cutLineIdx->cutLineIdx+1)去切实体多边形
var ret2 = CutByLineForCrossDi(listC[cutLineIdx % listC.Count],
listC[(cutLineIdx + 1) % listC.Count],
listS, true, cutStartIdx);
var interDirect2 = ret2.Item1;
WindowLog.Default.Log("得到C多边形边{0}{1}切割S多边形{2}{3}产生的交点，对于C进出性为{4}",
listC[cutLineIdx % listC.Count].Name,
listC[(cutLineIdx + 1) % listC.Count].Name,
s1.Name, s2.Name,
interDirect2 == CrossInOut.In ? "进" : "出");
if (interDirect1 == interDirect2) //进出性相同表示多边形不同向，反转其中一个多边形
{
WindowLog.Default.Log("交点进出性相同，把C多边形反向");
//文档中是把S进行了反向，但这里不行，如果反向S，则记录的第一个交点（主要是记录这个交点的进出性）就不再是第一个交点了
//所以实际实现中需要将C反向，而且反向后第一条边，仍然需要是确定第一点那条线段
var listCReverse = new List<VertexBase>();
var reverseStartIdx = cutLineIdx + 1;
for (int i = 0; i < listC.Count; i++)
{
listCReverse.Add(listC[(reverseStartIdx - i + listC.Count) % listC.Count]);
}
listC = listCReverse;
WindowLog.Default.ReversePolygon();
WindowLog.Default.Log("反向后多边形点序列为：{0}", string.Join("->", listC.Select(r => r.Name)));
}
WindowLog.Default.Log("使用S多边形边{0}{1}与C多边形{2}{3}交点为第一个点，对于S进出性为{4}", s1.Name, s2.Name,
listC[cutLineIdx % listC.Count].Name,
listC[(cutLineIdx + 1) % listC.Count].Name,
interDirect1 == CrossInOut.In ? "进" : "出");
_firstInterDi = ret.Item1;
break;
}
if (cutStartIdx == listS.Count)//没有交点
{
WindowLog.Default.Log("没有交点，进入无交点情况处理");
var ret = ProcessNoCross(listS, listC);
return ret == null ? new List<List<VertexBase>>() : new List<List<VertexBase>> { ret };
}
// 阶段2： 链接多边形，即设置Next
LinkNode(listS.Cast<Vertex>().ToList());
LinkNode(listC.Cast<Vertex>().ToList());
var listI = new List<Intersection>();
var linkC = new LinkedList<VertexBase>(listC);
//循环中用S中每条边切割C(准确说是C的链表，每次切割后交点插入C的列表再进行下次切割)，把交点插入S和C形成多边形链表
for (; cutStartIdx < listS.Count; cutStartIdx++)
{
var s1 = listS[cutStartIdx % listS.Count] as Vertex;
var s2 = listS[(cutStartIdx + 1) % listS.Count] as Vertex;
WindowLog.Default.Log("---------------使用S多边形边{0}{1}切割C多边形---------------", s1.Name, s2.Name);
var inters = CutByLine(s1, s2, linkC);
//var inters = ret;
if (inters.Count == 0) continue;
listI.AddRange(inters);
//把交点排序，准备插入S的边中
if (s1.X < s2.X)
inters.Sort((p1, p2) => p1.X.CompareTo(p2.X));
else
inters.Sort((p1, p2) => -(p1.X.CompareTo(p2.X)));
//将交点插入S的边中
s1.Next = inters[0];
for (int j = 0; j < inters.Count - 1; j++)
{
inters[j].NextS = inters[j + 1];
}
inters[inters.Count - 1].NextS = s2;
#region log
var sLinkSb = new StringBuilder();
var v = listS[0];
while (v != null)
{
sLinkSb.Append(v.Name);
VertexBase next = null;
if (v is Intersection)
{
var curr = v as Intersection;
next = curr.NextS;
}
else if (v is Vertex)
{
var curr = v as Vertex;
next = curr.Next;
}
if (next.Equals(listS[0]))
{
break;
}
v = next;
sLinkSb.Append("->");
}
WindowLog.Default.Log("------S链表：" + sLinkSb);
#endregion
}
// 设置交点的进出性
// 不能简单的把listI中的交点按偶奇的顺序标记进出性，因为listI中的顺序可能和S链表中交点出现的顺序不一样
// 需要安装S链表中交点的顺序标记
var secondDi = _firstInterDi == CrossInOut.In ? CrossInOut.Out : CrossInOut.In;
var nextS = (listS[0] as Vertex).Next;
int order = 1;
while (!nextS.Equals(listS[0]))
{
if (nextS is Intersection)
{
(nextS as Intersection).CrossDi = order %2 ==1 ? _firstInterDi:secondDi;
++order;
nextS = (nextS as Intersection).NextS;
}
else
{
nextS = (nextS as Vertex).Next;
}
}
#region log
foreach (var inters in listI)
{
WindowLog.Default.Log("交点{0}，NextS:{1}，NextC:{2}，S对于C进出性:{3}",
inters.Name, inters.NextS.Name, inters.NextC.Name, inters.CrossDi == CrossInOut.In ? "进" : "出");
WindowLog.Default.AddLabel(inters.Name, inters.ToPoint());
}
#endregion
//阶段3：按规则连接交点得到结果
var result = Compose(listI);
return result;
}
