I am trying to add a label to each edge in my Graph, below:
Basically the above with labels for each edge at the center:
I've tried to add a label when I add an edge to each graph, like so (for the graph g):
g.add_edge(... label=edge.distance ...) After some research, I found that such labeling was possible under Nodebox 1, which only works for Mac, there seems to be no suitable alternative for Nodebox-OpenGL from the documentation. The error I receive:
Traceback (most recent call last): File "C:\foo\bar\baz\Imager.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:\Python27\lib\site-packages\nodebox\graphics\physics.py", line 1254, in add_edge e2 = e2(n1, n2, *args, **kwargs) TypeError: __init__() got an unexpected keyword argument 'label' You can reproduce the problem:
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(), stroke = color(0), 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) So, the question remains, how can one add a label to a graph's edge in Nodebox-OpenGL?