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 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);
}