def draw_subdiv_facet(img, edge):
t = edge
count = 0
# count number of edges in facet
while count == 0 or t != edge:
count += 1
t = cv.Subdiv2DGetEdge(t, cv.CV_NEXT_AROUND_LEFT)
buf = []
# gather points
t = edge
for i in range(count):
assert t > 4
pt = cv.Subdiv2DEdgeOrg(t)
if not pt:
break
buf.append((cv.Round(pt.pt[0]), cv.Round(pt.pt[1])))
t = cv.Subdiv2DGetEdge(t, cv.CV_NEXT_AROUND_LEFT)
if (len(buf) == count):
pt = cv.Subdiv2DEdgeDst(cv.Subdiv2DRotateEdge(edge, 1))
cv.FillConvexPoly(
img, buf,
cv.RGB(random.randrange(256), random.randrange(256),
random.randrange(256)), cv.CV_AA, 0)
cv.PolyLine(img, [buf], 1, cv.RGB(0, 0, 0), 1, cv.CV_AA, 0)
draw_subdiv_point(img, pt.pt, cv.RGB(0, 0, 0))
def locate_point( subdiv, fp, img, active_color ):
(res, e0) = cv.Subdiv2DLocate( subdiv, fp );
if res in [ cv.CV_PTLOC_INSIDE, cv.CV_PTLOC_ON_EDGE ]:
e = e0
while True:
draw_subdiv_edge( img, e, active_color );
e = cv.Subdiv2DGetEdge(e, cv.CV_NEXT_AROUND_LEFT);
if e == e0:
break
draw_subdiv_point( img, fp, active_color );