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#+

# import maya
# maya.cmds.loadPlugin("yTwistNode.py")
# maya.cmds.sphere()
# maya.cmds.deformer( type='spyTwistNode' )

import math, sys

import maya.OpenMaya as OpenMaya
import maya.OpenMayaAnim as OpenMayaAnim
import maya.OpenMayaMPx as OpenMayaMPx

kPluginNodeTypeName = "spyTwistNode"

yTwistNodeId = OpenMaya.MTypeId(0x8702)

# Node definition
class yTwistNode(OpenMayaMPx.MPxDeformerNode):
	# class variables
	angle = OpenMaya.MObject()
	# constructor
	def __init__(self):
		OpenMayaMPx.MPxDeformerNode.__init__(self)
	# deform
	def deform(self,dataBlock,geomIter,matrix,multiIndex):
		#
		# get the angle from the datablock
		angleHandle = dataBlock.inputValue( self.angle )
		angleValue = angleHandle.asDouble()
		#
		# get the envelope
		envelope = OpenMayaMPx.cvar.MPxDeformerNode_envelope
		envelopeHandle = dataBlock.inputValue( envelope )
		envelopeValue = envelopeHandle.asFloat()
		#
		# iterate over the object and change the angle
		while geomIter.isDone() == False:
			point = geomIter.position()
			ff = angleValue * point.y * envelopeValue
			if ff != 0.0:
				cct= math.cos(ff)
				cst= math.sin(ff)
				tt= point.x*cct-point.z*cst
				point.z= point.x*cst + point.z*cct
				point.x=tt
			geomIter.setPosition( point )
			geomIter.next()
				
# creator
def nodeCreator():
	return OpenMayaMPx.asMPxPtr( yTwistNode() )

# initializer
def nodeInitializer():
	# angle
	nAttr = OpenMaya.MFnNumericAttribute()
	yTwistNode.angle = nAttr.create( "angle", "fa", OpenMaya.MFnNumericData.kDouble, 0.0 )
	#nAttr.setDefault(0.0)
	nAttr.setKeyable(True)
	# add attribute
	try:
		yTwistNode.addAttribute( yTwistNode.angle )
		outputGeom = OpenMayaMPx.cvar.MPxDeformerNode_outputGeom
		yTwistNode.attributeAffects( yTwistNode.angle, outputGeom )
	except:
		sys.stderr.write( "Failed to create attributes of %s node\n", kPluginNodeTypeName )
	
# initialize the script plug-in
def initializePlugin(mobject):
	mplugin = OpenMayaMPx.MFnPlugin(mobject)
	try:
		mplugin.registerNode( kPluginNodeTypeName, yTwistNodeId, nodeCreator, nodeInitializer, OpenMayaMPx.MPxNode.kDeformerNode )
	except:
		sys.stderr.write( "Failed to register node: %s\n" % kPluginNodeTypeName )

# uninitialize the script plug-in
def uninitializePlugin(mobject):
	mplugin = OpenMayaMPx.MFnPlugin(mobject)
	try:
		mplugin.deregisterNode( yTwistNodeId )
	except:
		sys.stderr.write( "Failed to unregister node: %s\n" % kPluginNodeTypeName )