Nodz: A Python repository from chris-gardner

Nodz is a very user friendly python library to create nodes based graphs. It can be connected to anything you want as long as it understands python. Nodz does not hold any data other than its own graphics and attributes types as it is used by the graphics. Nods provides you with a very simple way to read your graph, it outputs connections as strings ('Node1.attribute1', 'node2.attribute5')

Nodz is partially customizable via a configuration file that let you change colors and the shape of nodes.

If you find any errors/bugs/flaws or anything bad, feel free to let me know so I can fix it for the next persons that would like to download nodz.

PLEASE MAKE SURE TO CREATE 1 PULL REQUEST PER ISSUE ! THIS IS EASIER AND CLEANER TO PROCESS

Nodz in under the MIT license.

WATCH DEMO HERE

Prerequisite

Python
pyQt4 or pyQt5 or pySide or pySide2
Qt.py

Nodz needs to be in a PYTHONPATH.

Qt.py is very important as Nodz is based on it in order to work for multiple versions of Qt. Short and easy story for lazy peeps. 😄 This file has to be available within a PYTHONPATH.

Configuration file

Nodz comes with a default configuration file, it is specified what can be removed and what can't be. If this file stays in the default location, it is auto loaded BUT you still need to apply it to Nodz (look at nodz_demo.py lines 5/6) Be careful when editing it, if you are missing a "," it will error. So don't screw up. 😄

Features

Nodz comes by default with few features, you can toggle the grid visibility and the auto snap mode + some hotkeys. Hotkeys are at the moment based on Autodesk Maya because I developped this library for my personnal use in this specific software but I'm planning on adding that part in the configuration file so everyone can set different hotkeys.

nodz.gridVisToggle = True
nodz.gridSnapToggle = False

del : delete the selected nodes
f   : zoom focus on selected items, all the items if nothing is selected
s   : snap the selected node on the grid
tab : display the node creator helper

API

Nodz has a very simple API of 12 methods. For more information on each method, please read nodz_main.py as it has all the documentation required.

Initialize

def loadConfig(filePath=defautConfigPath)
def initialize()

Nodes

def createNode(name, preset, position, alternate)
def deleteNode(node)
def editNode(node, newName)
def initNodeCreationHelper(nodeList, nodeCreatorFunction)

Attributes

def createAttribute(node, name, index, preset, plug, socket, dataType, plugMaxConnections, socketMaxConnections)
def deleteAttribute(node, index)
def editAttribute( node, index, newName, newIndex)

Connections

def createConnection(sourceNode, sourceAttr, targetNode, targetAttr)

Graph

def autoLayoutGraph(margin)
def saveGraph(filePath)
def loadGraph(filePath)
def evaluateGraph()
def clearGraph()

Signals

Nodz also offers you some signals, most of them can feel redundant considering the design of the library but I'm sure some of you will find a use for it. It's better to have them just in case than not having them. They are absolutly not mandatory in order for nodz to work.