I then showed a solution that calculates a child node's indent in the parent node, and explicitly passes the indent as a method parameter to the child. I highlighted the fact that each node appears to need to know about the status of all its parent nodes - a fact that makes the initial solution non-obvious. In this post I described the requirements for drawing an ASCII-art tree using C#. Depending on how horizontally compact you'd like your tree to look, it's easy to tweak the various indent constants by adding additional space characters. In these examples I have the corner/cross pieces descending from the second character of the parent node. Now the tree is printed just as we would like: Default As a simple example, we'll consider nodes like the following: class Node Ideally, your data structure will look similar to the tree diagram you're building, but that's not required. For each node, enumerate (and count) the immediate child nodes.those nodes that are not a child of any other node Enumerate all the "top-level" or "root" nodes, i.e.This folder contains all components of the framework needed to get you started. File Structure Within the download package fo you will find a folder called Treant with the following file stucture. I highly recommend you check out that last link either way, it's excellent! Requirements for the data structureīefore we look at the tree itself, it's worth considering the data structure you need to build this tree. Treant.js is a Javascript library for createing tree structure charts with the power of HTML, CSS and SVG. You can also see Immo Landwerth recreate a similar tree in his recent video on building a compiler. Alternatively, take a look at the real code in the Cake project, or this Stack Overflow question which follows a similar approach. If you're not here for the chit-chat, and you just want the code, feel free to jump ahead. I recently made my first pull request to the Cake project in which I added a command line option ( -showtree) to display the tasks in a Cake script in a tree view.Ĭreating the tree view itself took me a couple of attempts to get right, and I'm bound to forget the trick for it, so in this post I'm going to show the code required to create a similar tree diagram in your own program.
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