将nltk绘制的分析树保存到图像文件 [英] Saving nltk drawn parse tree to image file

问题描述

是否可以通过编程方式将tree.draw()中的绘制图像保存到图像文件中?我尝试浏览文档，但找不到任何东西.

Is there any way to save the draw image from tree.draw() to an image file programmatically? I tried looking through the documentation, but I couldn't find anything.

推荐答案

我的需求完全相同，然后查看nltk.draw.tree的源代码，我找到了一个解决方案:

I had exactly the same need, and looking into the source code of nltk.draw.tree I found a solution:

from nltk import Tree
from nltk.draw.util import CanvasFrame
from nltk.draw import TreeWidget

cf = CanvasFrame()
t = Tree.fromstring('(S (NP this tree) (VP (V is) (AdjP pretty)))')
tc = TreeWidget(cf.canvas(),t)
cf.add_widget(tc,10,10) # (10,10) offsets
cf.print_to_file('tree.ps')
cf.destroy()

输出文件是一个脚本，您可以使用终端上的ImageMagick将其转换为图像文件:

The output file is a postscript, and you can convert it to an image file using ImageMagick on terminal:

$ convert tree.ps tree.png

我认为这是一个快速而肮脏的解决方案.它可能会效率低下，因为它会显示画布并在以后销毁它(也许有一个禁用显示的选项，我找不到).请让我知道是否有更好的方法.

I think this is a quick and dirty solution; it could be inefficient in that it displays the canvas and destroys it later (perhaps there is an option to disable display, which I couldn't find). Please let me know if there is any better way.

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