public static int start()
{
Debug.Print("TESTING HEAP");
Random rand = new Random();
List<HuffmanTreeNode> huff = new List<HuffmanTreeNode>();
for (int ii = 0; ii < 100; ii++)
huff.Add(HuffmanTreeNode.HuffmanTreeFactory('x', rand.Next(256)));
Heap h = new Heap(huff.ToArray());
for (int ii = 0; ii < 40; ii++)
h.extractMin();
Debug.Print(h.size.ToString());
for (int ii = 0; ii < 40; ii++)
h.insert(HuffmanTreeNode.HuffmanTreeFactory('x', rand.Next(256)));
Debug.Print(h.size.ToString());
double one = h.extractMin().freq;
double two;
while (h.size > 0)
{
two = h.extractMin().freq;
if (one > two)
{
Debug.Print("FAILED " + one.ToString() + " " + two.ToString());
}
one = two;
}
Debug.Print("PASSED");
return 0;
}
/// <summary>
/// Factory for building a HuffmanTree from a frequency list.
/// Also builds up a Dictionary of the nodes for encoding.
/// </summary>
/// <param name="freqlist">List of frequencies of characters.</param>
/// <param name="htDict">Empty dictionary to be filled.</param>
/// <returns>A Composite HuffmanTreeNode which is the root of the tree. Also passes a dictionary of the nodes by reference.</returns>
public static HuffmanTreeNodeComposite HuffmanTreeFactory(List<Frequency> freqlist, Dictionary<char, HuffmanTreeNodeLeaf> htDict)
{
foreach (Frequency element in freqlist)
{
HuffmanTreeNodeLeaf newLeaf = HuffmanTreeFactory(element.symbol, element.frequency);
htDict.Add(newLeaf.symbol, newLeaf);
}
HuffmanTreeNode[] nodeArray = htDict.Values.ToArray();
//swapped for more dynamic function which uses the array
/*Heap heap = new Heap();
for (int ii = 0; ii < nodeArray.Length; ii++)
{
if (nodeArray[ii] != null)
heap.insert(nodeArray[ii]);
}*/
Heap heap = new Heap(nodeArray);
HuffmanTreeNodeComposite root = null;
HuffmanTreeNode left;
HuffmanTreeNode right;
while (heap.size > 1)
{
left = heap.extractMin();
right = heap.extractMin();
root = HuffmanTreeFactory(left, right);
if (heap.size > 0)
heap.insert(root);
}
root.parent = null;
return root;
}
