source: branches/lib/GDE/MUSCLE/src/drawtree.cpp

#include "muscle.h"
#include "tree.h"

/***
Simple tree drawing algorithm.

y coordinate of node is index in depth-first traversal.
x coordinate is distance from root.
***/

static unsigned DistFromRoot(const Tree &tree, unsigned uNodeIndex)
        {
        const unsigned uRoot = tree.GetRootNodeIndex();
        unsigned uDist = 0;
        while (uNodeIndex != uRoot)
                {
                ++uDist;
                uNodeIndex = tree.GetParent(uNodeIndex);
                }
        return uDist;
        }

static void DrawNode(const Tree &tree, unsigned uNodeIndex)
        {
        if (!tree.IsLeaf(uNodeIndex))
                DrawNode(tree, tree.GetLeft(uNodeIndex));

        unsigned uDist = DistFromRoot(tree, uNodeIndex);
        for (unsigned i = 0; i < 5*uDist; ++i)
                Log(" ");
        Log("%d\n", uNodeIndex);

        if (!tree.IsLeaf(uNodeIndex))
                DrawNode(tree, tree.GetRight(uNodeIndex));
        }

void DrawTree(const Tree &tree)
        {
        unsigned uRoot = tree.GetRootNodeIndex();
        DrawNode(tree, uRoot);
        }