def offset(freemanCodes, pointIndex, closed = True):
if closed:
pointIndex = pointIndex % len(freemanCodes)
dsl, ofs = geomap.tangentDSL(freemanCodes, pointIndex, closed)
if not ofs:
return Vector2(0, 0)
fc1 = freemanCodes[pointIndex - ofs]
count = len(freemanCodes)
for crackIndex in range(pointIndex - ofs + 1, pointIndex + ofs):
fc2 = freemanCodes[crackIndex % count]
if fc2 != fc1:
break
q = quadrant(fc1, fc2)
alpha = (2.*dsl.pos+dsl.b-1)/(2*dsl.b)
if q == 0:
return Vector2( alpha, -alpha)
elif q == 1:
return Vector2(-alpha, -alpha)
elif q == 2:
return Vector2(-alpha, alpha)
else:
return Vector2( alpha, alpha)
def crackEdgeTangent(freemanCodes, pointIndex, closed):
dsl, ofs = geomap.tangentDSL(freemanCodes, pointIndex, closed)
if not ofs:
return dsl, ofs
dsl = dsl.convertToFourConnected()
fc1 = freemanCodes[pointIndex - ofs]
count = len(freemanCodes)
for crackIndex in range(pointIndex - ofs + 1, pointIndex + ofs):
fc2 = freemanCodes[crackIndex % count]
if fc2 != fc1:
break
q = quadrant(fc1, fc2)
if q == 0:
pass
elif q == 1:
dsl.mirrorX()
elif q == 2:
dsl.mirrorXY()
else:
dsl.mirrorY()
return dsl, ofs
