public static void FindOverlapingPolylines(ObjectId[] objectIds)
{
// 1. 建立拓扑关系
var topoData = BuildTopology(objectIds);
// 2. 清理掉所有的临时图形
PolylineTransientGraphics.ClearTransientGraphics();
var findOverlap = new FindOverlap();
// 3. 查找重叠的几何图元
var polygonOverlaps = FindOverlappingGeometries(findOverlap, topoData, objectIds);
// 4. 画出所有几何图元
DrawOverlappingGeometries(topoData, polygonOverlaps);
findOverlap.ReleaseRegions();
// 5. 输出到窗口
var document = Application.DocumentManager.MdiActiveDocument;
document.Editor.WriteMessage(String.Format("一共有{0}处重叠", polygonOverlaps.GeometryOverlaps.Count));
OutputMessage(polygonOverlaps.CannotCreateRegions, "不能造区");
OutputMessage(polygonOverlaps.CannotBooleanRegions, "不能作布尔运算");
OutputMessage(topoData.WrongEnvelopeObjects, "包围盒计算错误，可能有重复点");
OutputMessage(topoData.InvalidObjects, "内部拓扑错误");
}
public static PolygonOverlaps FindPolygonOverlaps(ObjectId[] objectIds)
{
// 1. 建立拓扑关系
var topoData = BuildTopology(objectIds);
var findOverlap = new FindOverlap();
// 3. 查找重叠的几何图元
var polygonOverlaps = FindOverlappingGeometries(findOverlap, topoData, objectIds);
return(polygonOverlaps);
}
private static PolygonOverlaps FindOverlappingGeometries(FindOverlap findOverlap, TopologyData topoData, ObjectId[] objectIds)
{
var overlap = new PolygonOverlaps();
var handledPairs = new HashSet <string>();
var count = 0;
foreach (var geom in topoData.Geometries)
{
// 先用NTS建立拓扑，初查，哪些是重叠的，非常快速。
var nearGeoms = GetNearGeometries(geom, topoData.Quadtree);
var thisObjId = (ObjectId)geom.UserData;
var ids = new ObjectIdCollection();
foreach (var geometry in nearGeoms)
{
var nearObjId = (ObjectId)geometry.UserData;
if (nearObjId != thisObjId)
{
// 记录当前处理的object对，这样避免重复计算一对相邻的多边形
var handle = thisObjId + "_" + nearObjId;
var handle2 = nearObjId + "_" + thisObjId;
//var thisGeometry = topoData.GeometryDictionary[thisObjId];
if (!handledPairs.Contains(handle) && !handledPairs.Contains(handle2))
{
// 先记录下来，处理过的，后面就不再处理了
handledPairs.Add(handle);
// var nearGeometry = topoData.GeometryDictionary[nearObjId];
try
{
//var intersect = thisGeometry.Overlaps(nearGeometry);
//if (intersect)
{
count++;
// 在NTS里面也许是接边的也算重叠的
// 再通过ACAD面域的计算，相交，如果有交集，则认为是有重叠的，而且画出交集。
var regionIntersection = CadUtils.GetIntersectionPart(thisObjId, nearObjId);
//var region = findOverlap.GetIntersectionPart(thisObjId, nearObjId);
if (regionIntersection != null)
{
// 相交了，有相交的Region
if (regionIntersection.ObjectId1.IsNull)
{
ids.Add(nearObjId);
overlap.GeometryOverlaps.Add(new GeometryOverlap()
{
ThisGeometry = thisObjId,
ThatGeometry = nearObjId,
IntersectRegion = regionIntersection.Region
});
}
// 没有相交，可能是造区错误
else if (regionIntersection.ObjectId1.IsNull)
{
overlap.CannotCreateRegions.Add(regionIntersection.ObjectId1);
}
// Object1/Object2
// 造区直接boolean运算发生错误
// 面域上的布尔运算失败 不同体顶点的重合 face_face_ints
else if (!regionIntersection.ObjectId1.IsNull && !regionIntersection.ObjectId2.IsNull)
{
overlap.CannotBooleanRegions.Add(
new KeyValuePair <ObjectId, ObjectId>(regionIntersection.ObjectId1,
regionIntersection.ObjectId2));
}
}
}
}
catch (Exception ex)
{
System.Diagnostics.Trace.WriteLine(ex.Message);
}
}
}
}
}
System.Diagnostics.Trace.WriteLine(count);
return(overlap);
}