public IEnumerator <Curve> GetEnumerator() => _loop2d.GetEnumerator();
/// <summary>
/// 检查是否首位相连，如果不首位相连，则将他以一定的规则首尾相连
/// </summary>
/// <param name="loop"></param>
/// <param name="tolerance"></param>
/// <returns>返回首位相连的Loop</returns>
/// <remarks>
/// 顺序遍历前后连条直线,如果不首位相连,则
/// 1.如果他们不平行,延长他们使之相交
/// 2.如果平行,检查距离是否大于给定tolerance:如果大于,在他们之间添加直线使之连接;如果小于,则平移后一条直线使之在前面一条直线的延长线上,在用直线相连
/// </remarks>
public static CurveLoop ValidateCurveLoop(this CurveLoop loop, double tolerance = 1 *MathHelper.Mm2Feet)
{
List <Curve> lines = new List <Curve>();
var enumerator = loop.GetEnumerator();
Queue <Curve> queue = new Queue <Curve>(2);
while (enumerator.MoveNext())
{
Curve currCurve = enumerator.Current;
queue.Enqueue(currCurve);
if (queue.Count != 2)
{
continue;
}
Curve preCurve = queue.Dequeue();
//处理当前两条直线
DealWithCurrTwoCurvres(ref currCurve, ref preCurve, out Line tempLine, tolerance);
lines.Add(preCurve);
if (tempLine != null)
{
lines.Add(tempLine);
}
//更新一个在队列中的Curve
queue.Dequeue();
queue.Enqueue(currCurve);
}
#region while循环之后 需要判断第一条和最后一条直线的关系
Curve lastCurve = queue.Dequeue();
Curve firstCurve = lines.First();
bool isMoved2 = DealWithCurrTwoCurvres(ref firstCurve, ref lastCurve, out Line tempLine2, tolerance);
lines.Add(lastCurve);
if (tempLine2 != null)
{
lines.Add(tempLine2);
}
//把firstCurve替换了
lines.RemoveAt(0);
lines.Insert(0, firstCurve);
//如果移动过currCurve(firstCurve)
if (isMoved2)
{
List <Curve> parallelFirstCurves = new List <Curve>(); //第一条线 后面(相邻的) 和第一条线平行的线
Curve notParallelFirstCurve = null; //第一条线 后面 第一个和他不平行的线
for (int i = 1; i < lines.Count; i++)
{
var tempLine = lines[i--];
lines.Remove(tempLine);
if (CurveUtils.IsAlmostParallelTo(firstCurve, tempLine))
{
parallelFirstCurves.Add(tempLine);
continue;
}
else
{
notParallelFirstCurve = tempLine;
break;
}
}
if (parallelFirstCurves.Count == 0)
{
ExtendTwoCurves(ref notParallelFirstCurve, ref firstCurve);
lines.Insert(1, notParallelFirstCurve);
}
else
{//先把所有和第一条直线平行的线，平移一定距离
double distance = firstCurve.DistanceTo(parallelFirstCurves.First());
XYZ dir = parallelFirstCurves.First().GetNormalInXoy(firstCurve.GetEndPoint(0));
var transform = Transform.CreateTranslation(dir * distance);
for (int i = 0; i < parallelFirstCurves.Count; i++)
{
parallelFirstCurves[i] = parallelFirstCurves[i].CreateTransformed(transform);
}
//自后向前一次重新加入
var lastParallelCurve = parallelFirstCurves.Last();
ExtendTwoCurves(ref notParallelFirstCurve, ref lastParallelCurve);
lines.Insert(1, notParallelFirstCurve);
for (int i = parallelFirstCurves.Count - 1; i > -1; i--)
{
lines.Insert(1, parallelFirstCurves[i]);
}
}
}
#endregion
return(CurveLoop.Create(lines));
}