def __init__(self, s=''):

self.num = 5

self.name = s

self.tn = ''

self.sn = ''

def create(self, *args):

# field get

temp_joint.num = int(

mc.intField('jntNum', q=True, value=True))

temp_joint.name = str(

mc.textField('tempJntName', q=True, text=True))

stretch_joint.name = str(

mc.textField('stretchJntName', q=True, text=True))

# curve rebuild

name_list = mc.ls(sl=True)

curve.name = name_list[0]

# shape node name edit

mc.rename(curve.name, 'tempCurveName')

mc.rename('tempCurveName', curve.name)

mc.rebuildCurve(kr=0)

mc.select(d=True)

# short name

s.tn = '%s_%s' % (curve.name, temp_joint.name)

s.sn = '%s_%s' % (curve.name, stretch_joint.name)

# crate temp temp_joint

for i in range(temp_joint.num):

mc.joint(p=(0, 0, 0), n='%s%s' % (s.tn, str(i + 1)))

mc.select(d=True)

p = 'pointOnCurveInfo'

mc.createNode('%s' % p, n='%s_%s%s' % (p, s.tn, str(i + 1)))

node_name = '%s_%s%s' % (p, s.tn, str(i + 1))

mc.connectAttr(

'%sShape.local' % curve.name,

'%s.inputCurve' % node_name)

mc.setAttr(

'%s.parameter' % node_name,

(float(1) / (temp_joint.num - 1)) * i)

mc.connectAttr(

'%s.position' % node_name,

'%s%s.translate' % (s.tn, str(i + 1)))

for i in range(temp_joint.num):

mc.select('%s%s' % (s.tn, str(i + 1)), add=True)

mc.group(n='%s_grp' % s.tn)

mc.setAttr('.visibility', 0)

mc.select(d=True)

# aim constraint

for i in range(temp_joint.num - 1):

first = '%s%s' % (s.tn, str(i + 1))

second = '%s%s' % (s.tn, str(i + 2))

mc.aimConstraint(second, first)

# create stretch joint

for i in range(temp_joint.num):

mc.joint(p=(0, 0, 0), n='%s%s' % (s.sn, str(i + 1)))

for i in range(temp_joint.num):

first = '%s%s' % (s.tn, str(i + 1))

second = '%s%s' % (s.sn, str(i + 1))

mc.parentConstraint(first, second)

mc.select(d=True)

def ui(self):

win = mc.window(title='stretch IK', widthHeight=(250, 145))

form = mc.formLayout()

jnt = mc.text(

l='jointNum', w=110, h=20)

jnf = mc.intField(

'jntNum', w=115, h=20, value=temp_joint.num)

tnt = mc.text(

l='tempJointName', w=115, h=20)

tnf = mc.textField(

'tempJntName', w=115, h=20, text=temp_joint.name)

snt = mc.text(

l='stretchJointName', w=110, h=20)

snf = mc.textField(

'stretchJntName', w=115, h=20, text=stretch_joint.name)

but = mc.button(

l='create StretchIK', w=230, h=50, c=self.create)

mc.formLayout(form, edit=True, attachForm=[

(jnt, 'top', 10), (jnt, 'left', 10),

(jnf, 'top', 10), (jnf, 'left', 125),

(tnt, 'top', 35), (tnt, 'left', 10),

(tnf, 'top', 35), (tnf, 'left', 125),

(snt, 'top', 60), (snt, 'left', 10),

(snf, 'top', 60), (snf, 'left', 125),

(but, 'top', 85), (but, 'left', 10)

])