Nuke Python for artists tutorials Manipulating the node graph with opinionated comments and notes in spanglish.

gistfile1.py

#n1=nuke.nodes.NoOp(xpos=0,ypos=0) #creates a NoOp node at 0,0...
# xpos and ypos are hidden knobs. 
n1=nuke.nodes.NoOp(xpos=0,ypos=0,label='0,0') #label pa marcarlo, not that it matters.
n2=nuke.nodes.NoOp(xpos=200,ypos=200,label='200,200') #same
#############
marker=nuke.nodes.Dot() #crear un dot
##############
marker.knob('xpos').setValue(100) #change xpos as a knob
##############
marker.setXpos(0) 
marker.setYpos(0) #also there are special functions for that
###############
marker.setXYpos(10,10) #and for modifying both at the same time
###############
width=n2.screenWidth() #this variable stores the width of a node
marker.setXYpos(n2.xpos()+width,n2.ypos()) #so i can place nodes in respect to each other
############
nuke.zoom() #returns current zoom
nuke.zoom(2)#  
nuke.zoom(0.1)# applies zoom
nuke.zoom(0.5,(marker.xpos(),marker.ypos())) #applies zoom to value + tuple or list of centrerpoint coordinates
nuke.zoom(0) #or negative = zoom to fit
#####################
for n in nuke.allNodes(): #from all nodes 
	nuke.delete(n) #delete all...

########################
######## function to scale node threes and stuff. ####################

def scaleNodes(factor): #define function and parameters
	nodes=nuke.selectedNodes() #grab the selected nodes into a variable
	if len(nodes)==0: #if the lenght of the selected node list is 0
		return #the function does nothing

	sumX=0 #sumatoria de valores de x
	sumY=0 #sumatoria de valores de y

	for n in nodes: #de todos los nodos
		sumX+=n.xpos() #sumo 
		sumY+=n.ypos() #y sumo y sumo

	centerX=sumX/len(nodes) 
	centerY=sumY/len(nodes) #para sacar promedios... o sea los centros

	for n in nodes: # para cada nodo
		n.setXpos(centerX+(n.xpos()-centerX)*factor)
		n.setYpos(centerY+(n.ypos()-centerY)*factor) #escalo la posicion con respecto al centro

menu=nuke.menu('Nuke') #get the menu
menu.addCommand('Edit/Node/Loosen Nodes','scaleNodes(1.5)','ctrl+=')
menu.addCommand('Edit/Node/Tighten Nodes','scaleNodes(0.75)','ctrl+-')#add commands
#this bit can be added to menu.py to get the node scaling function thing.


###############dot spiral thingy##################
import math
for x in range(1000): #will do nothing in PLE :(
    n = nuke.nodes.Dot()
    n.setXYpos(math.sin(x)*x/2, math.cos(x)*x/2)
    n['hide_input'].setValue(True)