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# sineNode.py

    #-
    # ==========================================================================
    # Copyright (C) 1995 - 2006 Autodesk, Inc. and/or its licensors.  All
    # rights reserved.
    #
    # The coded instructions, statements, computer programs, and/or related
    # material (collectively the "Data") in these files contain unpublished
    # information proprietary to Autodesk, Inc. ("Autodesk") and/or its
    # licensors, which is protected by U.S. and Canadian federal copyright
    # law and by international treaties.
    #
    # The Data is provided for use exclusively by You. You have the right
    # to use, modify, and incorporate this Data into other products for
    # purposes authorized by the Autodesk software license agreement,
    # without fee.
    #
    # The copyright notices in the Software and this entire statement,
    # including the above license grant, this restriction and the
    # following disclaimer, must be included in all copies of the
    # Software, in whole or in part, and all derivative works of
    # the Software, unless such copies or derivative works are solely
    # in the form of machine-executable object code generated by a
    # source language processor.
    #
    # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND.
    # AUTODESK DOES NOT MAKE AND HEREBY DISCLAIMS ANY EXPRESS OR IMPLIED
    # WARRANTIES INCLUDING, BUT NOT LIMITED TO, THE WARRANTIES OF
    # NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR
    # PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE, OR
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    # ==========================================================================
    #+

    # import maya
    # maya.cmds.loadPlugin("sineNode.py")
    # maya.cmds.createNode("spSineNode")
    # maya.cmds.getAttr("spSineNode1.output")

    import math, sys

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

    kPluginNodeTypeName = "spSineNode"

    sineNodeId = OpenMaya.MTypeId(0x87000)

    # Node definition
    class sineNode(OpenMayaMPx.MPxNode):
        # class variables
        input = OpenMaya.MObject()
        output = OpenMaya.MObject()
        def __init__(self):
            OpenMayaMPx.MPxNode.__init__(self)
        def compute(self,plug,dataBlock):
            if ( plug == sineNode.output ):
                dataHandle = dataBlock.inputValue( sineNode.input )

                inputFloat = dataHandle.asFloat()
                result = math.sin( inputFloat ) * 10.0
                outputHandle = dataBlock.outputValue( sineNode.output )
                outputHandle.setFloat( result )
                dataBlock.setClean( plug )

            return OpenMaya.kUnknownParameter

    # creator
    def nodeCreator():
        return OpenMayaMPx.asMPxPtr( sineNode() )

    # initializer
    def nodeInitializer():
        # input
        nAttr = OpenMaya.MFnNumericAttribute()
        sineNode.input = nAttr.create( "input", "in", OpenMaya.MFnNumericData.kFloat, 0.0 )
        nAttr.setStorable(1)
        # output
        nAttr = OpenMaya.MFnNumericAttribute()
        sineNode.output = nAttr.create( "output", "out", OpenMaya.MFnNumericData.kFloat, 0.0 )
        nAttr.setStorable(1)
        nAttr.setWritable(1)
        # add attributes
        sineNode.addAttribute( sineNode.input )
        sineNode.addAttribute( sineNode.output )
        sineNode.attributeAffects( sineNode.input, sineNode.output )

    # initialize the script plug-in
    def initializePlugin(mobject):
        mplugin = OpenMayaMPx.MFnPlugin(mobject)
        try:
            mplugin.registerNode( kPluginNodeTypeName, sineNodeId, nodeCreator, nodeInitializer )
        except:
            sys.stderr.write( "Failed to register node: %s" % kPluginNodeTypeName )
            raise

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