/// <summary>
/// Print the specified item and top.
/// </summary>
/// <param name="item">Item.</param>
/// <param name="top">Top.</param>
private static void Print(VisualTreeNode item, int top)
{
SwapColors();
if (item.Node.Color == TreeNodeColor.Black)
{
Console.BackgroundColor = ConsoleColor.DarkGray;
}
if (item.Node.Color == TreeNodeColor.Red)
{
Console.BackgroundColor = ConsoleColor.Red;
}
Print(item.Text, top, item.StartPos);
SwapColors();
if (item.Left != null)
{
PrintLink(top + 1, "┌", "┘", item.Left.StartPos + item.Left.Size / 2, item.StartPos);
}
if (item.Right != null)
{
PrintLink(top + 1, "└", "┐", item.EndPos - 1, item.Right.StartPos + item.Right.Size / 2);
}
}
/// <summary>
/// Print the specified root, topMargin and leftMargin.
/// </summary>
/// <param name="root">Root.</param>
/// <param name="topMargin">Top margin.</param>
/// <param name="leftMargin">Left margin.</param>
public static void Print(this TreeNode root, int topMargin = 2, int leftMargin = 2)
{
if (root == null)
{
return;
}
int rootTop = Console.CursorTop + topMargin;
List <VisualTreeNode> last = new List <VisualTreeNode>();
TreeNode next = root;
for (int level = 0; next != null; level++)
{
VisualTreeNode item = new VisualTreeNode()
{
Node = next,
Text = next.Item.ToString(" 0 ")
};
if (level < last.Count)
{
item.StartPos = last[level].EndPos + 1;
last[level] = item;
}
else
{
item.StartPos = leftMargin;
last.Add(item);
}
if (level > 0)
{
item.Parent = last[level - 1];
if (next == item.Parent.Node.Left)
{
item.Parent.Left = item;
item.EndPos = Math.Max(item.EndPos, item.Parent.StartPos);
}
else
{
item.Parent.Right = item;
item.StartPos = Math.Max(item.StartPos, item.Parent.EndPos);
}
}
next = next.Left ?? next.Right;
for (; next == null; item = item.Parent)
{
Print(item, rootTop + 2 * level);
if (--level < 0)
{
break;
}
if (item == item.Parent.Left)
{
item.Parent.StartPos = item.EndPos;
next = item.Parent.Node.Right;
}
else
{
if (item.Parent.Left == null)
{
item.Parent.EndPos = item.StartPos;
}
else
{
item.Parent.StartPos += (item.StartPos - item.Parent.EndPos) / 2;
}
}
}
Console.SetCursorPosition(0, rootTop + 2 * last.Count - 1);
}
}