Properly handling Inheritance of VizNode and using copy

[shivanangel]

Sorry, forgot to include that class as well.
Here is a super class of GreenObject called Model3D which derives
from viz.VizNode

class Model3D(viz.VizNode):
	
	GORM = None
	
	def __init__(self, string):
		
		#Typical string entry
		if type(string) == str:
			base = viz.add(string)
			viz.VizNode.__init__(self, base.id)
				
		#Use for on-the-fly creation in Vizard
		elif isinstance(string, viz.VizNode):
			base = string
			viz.VizNode.__init__(self, base.id)
				
		elif isinstance(string, int): #We are dealing with a copy that has passed in an id number
			viz.VizNode.__init__(self, string)
			
		
		else:
			print 'Copy type', string, type(string)

[farshizzo]

The node.copy command will pass all extra keyword arguments to the class __init__ method. You can override the copy method in your class and have it pass all the required arguments as keyword arguments to the underlying node.copy method. Example:

import viz
viz.go()

class MyNode(viz.VizNode):

	def __init__(self, model, parameter):

		if isinstance(model,basestring):
			base = viz.add(model)
			viz.VizNode.__init__(self, base.id)

		elif isinstance(model, viz.VizNode):
			viz.VizNode.__init__(self, model.id)

		elif isinstance(model, int):
			viz.VizNode.__init__(self, model)

		self._parameter = parameter

	def copy(self, parameter):
		return viz.VizNode.copy(self,parameter=parameter)

node = MyNode('gallery.osgb',0)
nodeCopy = node.copy(1)

Does this work for you scenario?

[shivanangel]

I believe it will work.
I'll create a new instance of the class in the copy constructor and pass the copy into the initializer.

This way the copy command will now not just copy viz.VizNode but I can code it to also copy the rest of the parameters I've attached to my new class as well.

Thank you,
George