To Find Self Intersection of LWPOLYLINE
IMHO, an interesting approach from an ARX/.NET perspective, is AcGeCurveCurveInt3d class. Once constructed, you can extract how (AcGeXConfig) curves intersect and or overlap. Some fancy footwork is needed for self-intersections, this Python sample uses AcGeCompositeCurve3d from the polyline, though one could investigate using individual components
from pyrx_imp import Rx, Ge, Gs, Gi, Db, Ap, Ed, Br
import traceback
from timeit import default_timer as timer
def PyRxCmd_doit():
try:
es, id, pnt = Ed.Editor.entSel("\nPick it: \n", Db.Polyline.desc())
start = timer()
pl = Db.Polyline(id)
pntset = set(pl.toPoint3dList()) # vertex set
# create CurveCurveInt3d from composit curves
c1 = pl.getAcGeCurve()
c2 = pl.getAcGeCurve()
cc = Ge.CurveCurveInt3d(c1, c2)
hits = []
# iterate intersections
for idx in range(0, cc.numIntPoints()):
pnt = cc.intPoint(idx)
# investigate how, I.e AcGeXConfig::kLeftRight
config1wrt1, config1wrt2 = cc.getIntConfigs(idx)
#print(config1wrt1, config1wrt2, pnt)
if not (Ge.AcGeXConfig.kOverlapOverlap & config1wrt1
and Ge.AcGeXConfig.kOverlapOverlap & config1wrt2):
hits.append(pnt)
if not pnt in pntset:
hits.append(pnt)
print(timer() - start)
hits = set(hits)
for p in hits:
Ed.Core.grDrawCircle(p, 10, 10, 2)
except Exception as err:
traceback.print_exception(err)
