python – 在nodebox opnegl中向标签的边缘添加标签

基本上上面是中心每个边缘的标签：

当我为每个图添加边时,我试图添加一个标签,就像这样(对于图g)：

g.add_edge(... label=edge.distance ...)

经过一些研究,我发现这种标签在Nodebox 1,which only works for Mac下是可能的,文件中似乎没有合适的Nodebox-OpenGL替代品.我收到的错误：

Traceback (most recent call last):
  File "C:foobarbazImager.py",line 29,in <module>
    g.add_edge(edge.fr,edge.to,length=edge.distance,weight=2,stroke=color(1.0,0.2,0.0),label="cheese")
  File "C:Python27libsite-packagesnodeboxgraphicsphysics.py",line 1254,in add_edge
    e2 = e2(n1,n2,*args,**kwargs)
TypeError: __init__() got an unexpected keyword argument 'label'

您可以重现该问题：

from nodebox.graphics import *
from nodebox.graphics.physics import Node,Edge,Graph

# Create a graph with randomly connected nodes.
# Nodes and edges can be styled with fill,stroke,strokewidth parameters.
# Each node displays its id as a text label,stored as a Text object in Node.text.
# To hide the node label,set the text parameter to None.
g = Graph()
# Random nodes.
for i in range(50):
    g.add_node(id=str(i+1),radius = 5,stroke = color(0),text = color(0))
# Random edges.
for i in range(75):
    node1 = choice(g.nodes)
    node2 = choice(g.nodes)
    g.add_edge(node1,node2,length = 1.0,weight = random(),label = "Placeholder")    #!!!!!!!!!!!!! ADDING THE label HERE

# Two handy tricks to prettify the layout:
# 1) Nodes with a higher weight (i.e. incoming traffic) appear bigger.
for node in g.nodes:
    node.radius = node.radius + node.radius*node.weight
# 2) Nodes with only one connection ("leaf" nodes) have a shorter connection.
for node in g.nodes:
    if len(node.edges) == 1:
        node.edges[0].length *= 0.1

g.prune(depth=0)          # Remove orphaned nodes with no connections.
g.distance         = 10   # Overall spacing between nodes.
g.layout.force     = 0.01 # Strength of the attractive & repulsive force.
g.layout.repulsion = 15   # Repulsion radius.

dragged = None
def draw(canvas):

    canvas.clear()
    background(1)
    translate(250,250)

    # With directed=True,edges have an arrowhead indicating the direction of the connection.
    # With weighted=True,Node.centrality is indicated by a shadow under high-traffic nodes.
    # With weighted=0.0-1.0,indicates nodes whose centrality > the given threshold.
    # This requires some extra calculations.
    g.draw(weighted=0.5,directed=True)
    g.update(iterations=10)

    # Make it interactive!
    # When the mouse is pressed,remember on which node.
    # Drag this node around when the mouse is moved.
    dx = canvas.mouse.x - 250 # Undo translate().
    dy = canvas.mouse.y - 250
    global dragged
    if canvas.mouse.pressed and not dragged:
        dragged = g.node_at(dx,dy)
    if not canvas.mouse.pressed:
        dragged = None
    if dragged:
        dragged.x = dx
        dragged.y = dy

canvas.size = 500,500
canvas.run(draw)

那么,问题仍然存在,如何在Nodebox-OpenGL中为图形边缘添加标签？