private void SimpleSplit()
{
PartStatus left = new PartStatus();
PartStatus right = new PartStatus();
foreach (ShapePoint pt in _originalPoints)
{
if (pt.X >= _X)
{
right.Points.Add(pt);
}
else
{
left.Points.Add(pt);
}
}
if (left.Points.Count > 0)
{
_leftParts.Add(left);
}
if (right.Points.Count > 0)
{
_rightParts.Add(right);
}
}
private void GetActivePart(ShapePoint pt, ShapePoint prePoint)
{
CrossPoint crossPt = null;
//获取跨分割线的交点
if (prePoint != null)
{
crossPt = GetCrossPoint(pt, prePoint);
if (crossPt == null)
{
throw new Exception("获取一对点的交点失败。"); //不会出现这样的错误。
}
}
//
if (_activePartCollection.Count == 0)
{
_activePart = new PartStatus();
_activePartCollection.Add(_activePart);
goto endLine;
}
else
{
//获取相邻的环
foreach (PartStatus part in _activePartCollection)
{
bool isLessThan = false;
if (part.IsNear(crossPt.Index, out isLessThan))//相邻
{
if (_activePartCollection.Equals(_leftParts) && isLessThan)
{
_activePart = part;
goto endLine;
}
if ((_activePartCollection.Equals(_rightParts) && !isLessThan))
{
_activePart = part;
goto endLine;
}
}
}
_activePart = new PartStatus();
//将新建的环加入活动环集合
_activePartCollection.Add(_activePart);
goto endLine;
}
endLine:
//将当前交点与活动环关联
if (crossPt != null)
{
if (_prePartStatus != null)
{
_prePartStatus.AddLinkeCrossPointIndex(crossPt.Index);
}
}
_prePartStatus = _activePart;
}
public void Reset(ShapePoint[] points)
{
_originalPoints = new List <ShapePoint>(points);
_crossPoints.Clear();
_X = 0;
_currentPointIndex = -1;
_activePart = null;
_activePartCollection = null;
_prePartStatus = null;
}