Nuke_Workgroup_12.2/pythonpluginsUI/alignNodes/alignNodes.py

import nuke
import alignNodes

class alignNodes(KellerNukePlugin):

    def configurePlugin(self):
        #self.menu = nuke.menu("Nuke")
        #self.m = menubar.addMenu("&Edit")
        nuke.menu('Nuke').addCommand('Edit/Node/Align/horizontally', 'alignNodes.alignNodesExec( nuke.selectedNodes(), direction="x")', 'alt+x')
        nuke.menu('Nuke').addCommand('Edit/Node/Align/vertically', 'alignNodes.alignNodesExec( nuke.selectedNodes(), direction="y")', 'alt+y')

    def unconfigurePlugin(self):
        self.menu.removeItem("alignNodes")
        pass

def alignNodesExec(nodes, direction = 'x'):
    '''Align nodes either horizontally or vertically.'''
    direction = direction.lower()
    if len(nodes) < 2:
        return
    if direction not in ('x', 'y'):
        raise ValueError, 'direction argument must be x or y'
    
    if direction == 'x':       
        positions = [float(n['xpos'].value() + n.screenWidth() * .5) for n in nodes]
    else:
        positions = [float(n['ypos'].value() + n.screenHeight() * .5) for n in nodes]
    avrg = sum(positions) / len(positions)
    for n in nodes:
        if direction == 'x':
            for n in nodes:
                n.setXpos(int(avrg - n.screenWidth() * .5))
        else:
            for n in nodes:
                n.setYpos(int(avrg - n.screenHeight() * .5))

    return avrg