IB API butterfly

anyone know how to create a butterfly spread through IB's api (java or python)?

I can create a 2 legged BAG. I can create a 3 legged BAG but not at different ratio sizes.

here's what I have

Code:

class BagBuilder(object):
    def __init__(self):
        self.addAllLegs = []

    def addLeg (self,cid,ratio,side,exchange):
        leg =  ComboLeg()
        #print "conid in bag %s" % (cid)
        leg.m_conId = cid
        leg.m_ratio = ratio
        leg.m_action = side
        leg.m_exchange = exchange
        leg.m_openClose = 0
        leg.m_shortSaleSlot = 0
        leg.m_designatedLocation = ""
        self.addAllLegs.append(leg)

    def create(self,symbol):
        contract = Contract()
        contract.m_symbol = "USD"     # For combo order use ?USD? as the symbol value all the time
        contract.m_secType = "BAG"   # BAG is the security type for COMBO order
        contract.m_exchange = self.addAllLegs[0].m_exchange
        contract.m_currency = "USD"
        contract.m_comboLegs = self.addAllLegs #including combo order in contract object
        contract.m_symbol = symbol
        return contract

bb = BagBuilder()
bb.addLeg(113982825,1,"SELL",'ECBOT')
bb.addLeg(113982910,1,"SELL",'ECBOT')
bb.addLeg(113983022,2,"BUY",'ECBOT')
bg = bb.create('ZN')

 

Here's some vba that does it - translating it to java should be pretty straightforward. There are four legs here that allow sending either an iron condor or butterfly (depending on arguments passed for conId2 and conId3 - the meat strikes).

Code:

Sub SubmitOrder(sym As String, exch As String, lmt As Double, qty As Long, conId1 As Long, conId2 As Long, conId3 As Long, conId4 As Long, ratio2 As Integer, ratio3 As Integer, ref As String)

Dim comboLeg1 As TWSLib.IComboLeg
Dim comboLeg2 As TWSLib.IComboLeg
Dim comboLeg3 As TWSLib.IComboLeg
Dim comboLeg4 As TWSLib.IComboLeg
                                  
    ' create contract structure
    Set objTWSControl.m_contractInfo = objTWSControl.m_TWSControl.createContract()
    ' create order structure
    Set objTWSControl.m_orderInfo = objTWSControl.m_TWSControl.createOrder()
    
        ' contract info
    With objTWSControl.m_contractInfo
        .symbol = sym
        .secType = "BAG"
        .exchange = exch
        .currency = "USD"
    End With

    ' order info
    With objTWSControl.m_orderInfo
        .action = "BUY"
        .totalQuantity = qty
        .orderType = "LMT"
        .lmtPrice = lmt
        .timeInForce = "DAY"
        .orderRef = ref
        .transmit = True
    End With

    ' create combo leg list
    objTWSControl.m_contractInfo.comboLegs = objTWSControl.m_TWSControl.createComboLegList()
        
    ' create order combo leg list
    'objTWSControl.m_orderInfo.orderComboLegs = objTWSControl.m_TWSControl.createOrderComboLegList()
    
    If conId1 > 0 Then
        Set comboLeg1 = objTWSControl.m_contractInfo.comboLegs.Add()
        comboLeg1.conId = conId1
        comboLeg1.ratio = 1
        comboLeg1.action = "BUY"
        comboLeg1.exchange = exch
    End If
    
    If conId2 > 0 Then
        Set comboLeg2 = objTWSControl.m_contractInfo.comboLegs.Add()
        comboLeg2.conId = conId2
        comboLeg2.ratio = ratio2
        comboLeg2.action = "SELL"
        comboLeg2.exchange = exch
    End If
    
    If conId3 > 0 Then
        Set comboLeg3 = objTWSControl.m_contractInfo.comboLegs.Add()
        comboLeg3.conId = conId3
        comboLeg3.ratio = ratio3
        comboLeg3.action = "SELL"
        comboLeg3.exchange = exch
    End If
    
    If conId4 > 0 Then
        Set comboLeg4 = objTWSControl.m_contractInfo.comboLegs.Add()
        comboLeg4.conId = conId4
        comboLeg4.ratio = 1
        comboLeg4.action = "BUY"
        comboLeg4.exchange = exch
    End If
                            
    orderId = objTWSControl.m_orderId
    objTWSControl.m_orderId = orderId + 1
        
    'place order
    Call objTWSControl.m_TWSControl.placeOrderEx(orderId, objTWSControl.m_contractInfo, objTWSControl.m_orderInfo)
    
End Sub