python/api1/py1CircleNodeTest.py

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#
#  Autodesk Script File
#  MODIFY THIS AT YOUR OWN RISK
#
#  Creation Date:   27 September 2006
#
#  Description:
#     This script creates a new top level Maya menu that contains a
#      single item "Move in Circle".  When selected, it will create
#     a sphere and a dependency node that moves this in a circle,
#     and connect these 2 together.
#
#     When the play button on the time slider is pressed, the sphere
#     will move in a cirle around the Y axis.
#
#  Procedures:
#     circleMenu, createSphereAndAttachCircleNode
#

import maya.cmds as cmds

# Callback routine for the menu item created in CircleMenu
def createSphereAndAttachCircleNode(*args):
    # Create a circle node dependency object called "circleNode1"
    cmds.createNode("spCircle", name="circleNode1")

    # Create a sphere called "sphere1"
    cmds.sphere(name="sphere1", radius=1)

    # Connect the sine output attribute of "circleNode1"
    # to the X position of "sphere1"
    cmds.connectAttr("circleNode1.sineOutput", "sphere1.translateX")

    # Connect the cosine output attribute of "circleNode1"
    # to the Z position of "sphere1"
    cmds.connectAttr("circleNode1.cosineOutput", "sphere1.translateZ")

    # Connect the output of the time slider, "time1", in frames
    # to the input of "circleNode1".
    cmds.connectAttr("time1.outTime", "circleNode1.input")

    # "circleNode1" will now compute the X and Z positions of "sphere1"
    # as a function of the frame in the current animation.

def circleMenu():
    # The global string variable gMainWindow contains the name of top
    # Level Maya window.  Using this as the parent in a menu command
    # will create a new menu at the same level as "File", "Edit", etc.
    mainWindow = maya.mel.eval( "global string $gMainWindow;$temp = $gMainWindow" )

    # Create a top level menu called "Circle".  Its only menu item
    # is called "Move in circle", and when invoked by the user, it
    # will call the createSphereAndAttachCircleNode procedure shown above.
    cmds.menu("circleMenu", parent=mainWindow, tearOff=True, label="Circle")
    cmds.menuItem("circleMenuItem1", label="Move in circle", command=createSphereAndAttachCircleNode)

# Run circleMenu to add "Circle" to the top level Maya menu list.
circleMenu()