如何通过networkx制作可点击的图表? [英] How to make a click-able graph by networkx?
问题描述
我正在尝试在 python 中生成图形的可点击图像.一开始直接调用graphviz,后来发现networkx http://networkx.lanl.gov .
I am trying to produce a clickable image of a graph in python. I directly called graphviz at first, then discovered networkx http://networkx.lanl.gov .
我希望我的程序能够获取有关在用户单击图形的 (x,y) 坐标处显示哪个节点的信息.我想我可以使用打开并显示图形的 pyplot 窗口,在鼠标单击时使用 (x,y) 坐标,但我需要某种图像映射来知道哪个节点已在该坐标处可视化!
I'd like my program to obtain info about which node is displayed at the (x,y) coordinate where the user clicked the graph. I guess I could work with the pyplot window that opens and displays the graph, using the (x,y) coordinates at mouse-click, but I would need some kind of imagemap to know which node has been visualized at that coordinates!
你能说它是否/如何做到吗?
Can you tell be if/how it can be done?
推荐答案
感谢 http://groups.google.com/group/networkx-discuss( http://groups.google.com/group/networkx-discuss/browse_thread/thread/aac227e1fb2a4719 ):
以下(部分)代码在 Tkinter 中工作,允许创建包含 networkx 图的 matplotlib 窗口(顺便说一下,非阻塞),并在您单击给定节点时执行过程 visitNode().>
The following (partial) code works in Tkinter, allows the creation of a matplotlib window (non blocking, by the way) containing a networkx graph, and executes the procedure visitNode() if you click on a given node.
import networkx as nx
import matplotlib.pyplot as plt
import pylab
class AnnoteFinder: # thanks to http://www.scipy.org/Cookbook/Matplotlib/Interactive_Plotting
"""
callback for matplotlib to visit a node (display an annotation) when points are clicked on. The
point which is closest to the click and within xtol and ytol is identified.
"""
def __init__(self, xdata, ydata, annotes, axis=None, xtol=None, ytol=None):
self.data = zip(xdata, ydata, annotes)
if xtol is None: xtol = ((max(xdata) - min(xdata))/float(len(xdata)))/2
if ytol is None: ytol = ((max(ydata) - min(ydata))/float(len(ydata)))/2
self.xtol = xtol
self.ytol = ytol
if axis is None: axis = pylab.gca()
self.axis= axis
self.drawnAnnotations = {}
self.links = []
def __call__(self, event):
if event.inaxes:
clickX = event.xdata
clickY = event.ydata
if self.axis is None or self.axis==event.inaxes:
annotes = []
for x,y,a in self.data:
if clickX-self.xtol < x < clickX+self.xtol and clickY-self.ytol < y < clickY+self.ytol :
dx,dy=x-clickX,y-clickY
annotes.append((dx*dx+dy*dy,x,y, a) )
if annotes:
annotes.sort() # to select the nearest node
distance, x, y, annote = annotes[0]
self.visitNode(annote)
def visitNode(self, annote): # Visit the selected node
# do something with the annote value
print "visitNode", annote
fig = plt.figure() ax = fig.add_subplot(111) ax.set_title('select nodes to navigate there')
G=nx.MultiDiGraph() # directed graph G = nx.wheel_graph(5)
pos=nx.spring_layout(G) # the layout gives us the nodes position x,y,annotes=[],[],[] for key in pos:
d=pos[key]
annotes.append(key)
x.append(d[0])
y.append(d[1]) nx.draw(G,pos,font_size=8)
af = AnnoteFinder(x,y, annotes) fig.canvas.mpl_connect('button_press_event', af)
plt.show()
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