private static TopologyData BuildTopology(ObjectId[] objectIds)
{
var topoData = new TopologyData();
var database = objectIds[0].Database;
using (var tr = database.TransactionManager.StartTransaction())
{
var reader = new DwgReader();
foreach (ObjectId objectId in objectIds)
{
// 如果没有
var curve = tr.GetObject(objectId, OpenMode.ForRead) as Curve;
if (curve == null || !curve.Visible)
{
continue;
}
// 图层关闭，继续，因为有可能是图幅层
var layer = (LayerTableRecord)tr.GetObject(curve.LayerId, OpenMode.ForRead);
if (layer.IsOff)
{
continue;
}
// 目前只处理封闭的和大于3的多边形
// http://192.168.0.6:8080/browse/LCLIBCAD-903
// 否则会弹出points must form a closed linestring异常
if (curve.Closed &&
reader.NumberOfVerticesMoreThan3(curve))
{
var geom = reader.ReadCurveAsPolygon(tr, curve) as IGeometry;
geom = geom.Buffer(0);
if (!geom.IsValid)
{
topoData.InvalidObjects.Add(objectId);
System.Diagnostics.Trace.WriteLine(geom.ToString());
}
// 没有包围盒，无法进入空间索引
else if (geom.EnvelopeInternal.IsNull)
{
topoData.WrongEnvelopeObjects.Add(objectId);
}
else
{
//geom = SimpleGeometryPrecisionReducer.Reduce(geom, pmFixed3);
geom.UserData = objectId;
topoData.Quadtree.Insert(geom.EnvelopeInternal, geom);
topoData.Geometries.Add(geom);
topoData.GeometryDictionary[objectId] = geom;
}
}
}
tr.Commit();
}
return(topoData);
}
public static void DrawOverlappingGeometries(TopologyData topoData, PolygonOverlaps overlaps)
{
if (!overlaps.GeometryOverlaps.Any())
{
return;
}
var regions = new List <Region>();
var database = overlaps.GeometryOverlaps[0].ThisGeometry.Database;
// 读取CAD图元，并且绘制出来
foreach (var overlap in overlaps.GeometryOverlaps)
{
regions.Add(overlap.IntersectRegion);
}
// 画出来
PolylineTransientGraphics.CreateTransientRegions(database, regions);
}
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);
}