def __init__(self,
crv,
pnt=[0., 0., 0.],
vector=[1., 0., 0.],
theta=2. * math.pi):
if not isinstance(crv, Crv.Crv):
raise NURBSError, 'Parameter crv not derived from Crv class!'
# Translate and rotate the curve into alignment with the z-axis
T = translate(-numerix.asarray(pnt, numerix.Float))
# Normalize vector
vector = numerix.asarray(vector, numerix.Float)
len = numerix.sqrt(numerix.add.reduce(vector * vector))
if len == 0:
raise ZeroDivisionError, "Can't normalize a zero-length vector"
vector = vector / len
if vector[0] == 0.:
angx = 0.
else:
angx = math.atan2(vector[0], vector[2])
RY = roty(-angx)
vectmp = numerix.ones((4, ), numerix.Float)
vectmp[0:3] = vector
vectmp = numerix.dot(RY, vectmp)
if vectmp[1] == 0.:
angy = 0.
else:
angy = math.atan2(vector[1], vector[2])
RX = rotx(angy)
crv.trans(numerix.dot(RX, numerix.dot(RY, T)))
arc = Crv.Arc(1., [0., 0., 0.], 0., theta)
narc = arc.cntrl.shape[1]
ncrv = crv.cntrl.shape[1]
coefs = numerix.zeros((4, narc, ncrv), numerix.Float)
angle = numerix.arctan2(crv.cntrl[1, :], crv.cntrl[0, :])
vectmp = crv.cntrl[0:2, :]
radius = numerix.sqrt(numerix.add.reduce(vectmp * vectmp))
for i in xrange(0, ncrv):
coefs[:, :, i] = numerix.dot(
rotz(angle[i]),
numerix.dot(
translate((0., 0., crv.cntrl[2, i])),
numerix.dot(scale((radius[i], radius[i])), arc.cntrl)))
coefs[3, :, i] = coefs[3, :, i] * crv.cntrl[3, i]
Srf.__init__(self, coefs, arc.uknots, crv.uknots)
T = translate(pnt)
RX = rotx(-angy)
RY = roty(angx)
self.trans(numerix.dot(T, numerix.dot(RY, RX)))
def __init__(self, crv, vector):
if not isinstance(crv, Crv.Crv):
raise NURBSError, 'Parameter crv not derived from Crv class!'
coefs = numerix.zeros((4, crv.cntrl.shape[1], 2), numerix.Float)
coefs[:, :, 0] = crv.cntrl
coefs[:, :, 1] = numerix.dot(translate(vector), crv.cntrl)
Srf.__init__(self, coefs, crv.uknots, [0., 0., 1., 1.])
def __init__(self, crv, vector):
if not isinstance(crv, Crv.Crv):
raise NURBSError, 'Parameter crv not derived from Crv class!'
coefs = np.zeros((4,crv.cntrl.shape[1],2), np.float)
coefs[:,:,0] = crv.cntrl
coefs[:,:,1] = np.dot(translate(vector), crv.cntrl)
Srf.__init__(self, coefs, crv.uknots, [0., 0., 1., 1.])
def __init__(self, crv, pnt = [0., 0., 0.], vector = [1., 0., 0.], theta = 2.*math.pi):
if not isinstance(crv, Crv.Crv):
raise NURBSError, 'Parameter crv not derived from Crv class!'
# Translate and rotate the curve into alignment with the z-axis
T = translate(-np.asarray(pnt, np.float))
# Normalize vector
vector = np.asarray(vector, np.float)
len = np.sqrt(np.add.reduce(vector*vector))
if len == 0:
raise ZeroDivisionError, "Can't normalize a zero-length vector"
vector = vector/len
if vector[0] == 0.:
angx = 0.
else:
angx = math.atan2(vector[0], vector[2])
RY = roty(-angx)
vectmp = np.ones((4,), np.float)
vectmp[0:3] = vector
vectmp = np.dot(RY, vectmp)
if vectmp[1] == 0.:
angy = 0.
else:
angy = math.atan2(vector[1], vector[2])
RX = rotx(angy)
crv.trans(np.dot(RX, np.dot(RY, T)))
arc = Crv.Arc(1., [0., 0., 0.], 0., theta)
narc = arc.cntrl.shape[1]
ncrv = crv.cntrl.shape[1]
coefs = np.zeros((4, narc, ncrv), np.float)
angle = np.arctan2(crv.cntrl[1,:], crv.cntrl[0,:])
vectmp = crv.cntrl[0:2,:]
radius = np.sqrt(np.add.reduce(vectmp*vectmp))
for i in xrange(0, ncrv):
coefs[:,:,i] = np.dot(rotz(angle[i]),
np.dot(translate((0., 0., crv.cntrl[2,i])),
np.dot(scale((radius[i], radius[i])), arc.cntrl)))
coefs[3,:,i] = coefs[3,:,i] * crv.cntrl[3,i]
Srf.__init__(self, coefs, arc.uknots, crv.uknots)
T = translate(pnt)
RX = rotx(-angy)
RY = roty(angx)
self.trans(np.dot(T, np.dot(RY, RX)))
def __init__(self, radius=1., center=None, sang=0., eang=2 * math.pi):
sweep = eang - sang # sweep angle of arc
if sweep < 0.:
sweep = 2. * math.pi + sweep
if abs(sweep) <= math.pi / 2.:
narcs = 1 # number of arc segments
knots = [0., 0., 0., 1., 1., 1.]
elif abs(sweep) <= math.pi:
narcs = 2
knots = [0., 0., 0., 0.5, 0.5, 1., 1., 1.]
elif abs(sweep) <= 3. * math.pi / 2.:
narcs = 3
knots = [
0., 0., 0., 1. / 3., 1. / 3., 2. / 3., 2. / 3., 1., 1., 1.
]
else:
narcs = 4
knots = [0., 0., 0., 0.25, 0.25, 0.5, 0.5, 0.75, 0.75, 1., 1., 1.]
dsweep = sweep / (2. * narcs)
# arc segment sweep angle/2
# determine middle control point and weight
wm = math.cos(dsweep)
x = radius * math.cos(dsweep)
y = radius * math.sin(dsweep)
xm = x + y * math.tan(dsweep)
# arc segment control points
ctrlpt = np.array(
[[x, wm * xm, x], [-y, 0., y], [0., 0., 0.], [1., wm, 1.]],
np.float)
# build up complete arc from rotated segments
coefs = np.zeros((4, 2 * narcs + 1),
np.float) # nurb control points of arc
# rotate to start angle
coefs[:, 0:3] = np.dot(rotz(sang + dsweep), ctrlpt)
xx = rotz(2 * dsweep)
for ms in range(2, 2 * narcs, 2):
coefs[:, ms:ms + 3] = np.dot(xx, coefs[:, ms - 2:ms + 1])
if center:
xx = translate(center)
coefs = np.dot(xx, coefs)
super(Arc, self).__init__(coefs, knots)
def __init__(self, radius = 1.,center = None, sang = 0., eang = 2*math.pi):
sweep = eang - sang # sweep angle of arc
if sweep < 0.:
sweep = 2.*math.pi + sweep
if abs(sweep) <= math.pi/2.:
narcs = 1 # number of arc segments
knots = [0., 0., 0., 1., 1., 1.]
elif abs(sweep) <= math.pi:
narcs = 2
knots = [0., 0., 0., 0.5, 0.5, 1., 1., 1.]
elif abs(sweep) <= 3.*math.pi/2.:
narcs = 3
knots = [0., 0., 0., 1./3., 1./3., 2./3., 2./3., 1., 1., 1.]
else:
narcs = 4
knots = [0., 0., 0., 0.25, 0.25, 0.5, 0.5, 0.75, 0.75, 1., 1., 1.]
dsweep = sweep/(2.*narcs); # arc segment sweep angle/2
# determine middle control point and weight
wm = math.cos(dsweep)
x = radius*math.cos(dsweep)
y = radius*math.sin(dsweep)
xm = x+y*math.tan(dsweep)
# arc segment control points
ctrlpt = numerix.array([[x, wm*xm, x], [-y, 0., y], [0., 0., 0.], [1., wm, 1.]], numerix.Float)
# build up complete arc from rotated segments
coefs = numerix.zeros((4, 2*narcs+1), numerix.Float) # nurb control points of arc
# rotate to start angle
coefs[:,0:3] = numerix.dot(rotz(sang + dsweep), ctrlpt)
xx = rotz(2*dsweep)
for ms in range(2, 2*narcs,2):
coefs[:,ms:ms+3] = numerix.dot(xx, coefs[:,ms-2:ms+1])
if center:
xx = translate(center)
coefs = numerix.dot(xx, coefs)
Crv.__init__(self, coefs, knots)
def __init__(self, radius = .5, center = None):
UnitCircle.__init__(self)
if radius != 1.:
self.trans(scale([radius, radius]))
if center:
self.trans(translate(center))
def __init__(self, radius = .5, center = None):
super(Circle, self).__init__()
if radius != 1.:
self.trans(scale([radius, radius]))
if center:
self.trans(translate(center))
def __init__(self, radius=.5, center=None):
super(Circle, self).__init__()
if radius != 1.:
self.trans(scale([radius, radius]))
if center:
self.trans(translate(center))
def __init__(self, radius=.5, center=None):
UnitCircle.__init__(self)
if radius != 1.:
self.trans(scale([radius, radius]))
if center:
self.trans(translate(center))
