public int HeightOfTheNode(NodeView node)
{
if (node == null)
return -1;
else
return Math.Max (HeightOfTheNode (node.LeftChild), HeightOfTheNode (node.RightChild)) + 1;
}
public void InsertNode(int data)
{
if (Contains (data))
return;
var newNode = new NodeView (data);
AddSubview (newNode);
if (root == null) {
root = newNode;
return;
}
current = root;
while (true) {
if (newNode.Data > current.Data) {
if (current.RightChild == null) {
current.RightChild = newNode;
break;
}
current = current.RightChild;
} else {
if (current.LeftChild == null) {
current.LeftChild = newNode;
break;
}
current = current.LeftChild;
}
}
//Set the current frame
var treeHeight = HeightOfTheNode (root) + 1;
var frameHeightToSet = treeHeight * NodeHeight + (treeHeight - 1) * HeightDistanceBetweenLevels;
// ******************** edit start 0 ********************* //
// var frameWidthToSet = Math.Pow (2, treeHeight) * NodeWidth;
// this.Frame = new CoreGraphics.CGRect (0, 0, frameWidthToSet, frameHeightToSet);
var Editedtreewidth = Math.Pow (2, treeHeight);
var Editedframewidthtoset = Editedtreewidth * NodeWidth + (Editedtreewidth - 1) * WidthDistanceBetweenAdjacentNodes;
this.Frame = new CoreGraphics.CGRect (0, 0, Editedframewidthtoset, frameHeightToSet);
// ******************** edit end 0 ********************* //
var parent = (this.Superview as UIScrollView);
if (parent != null) {
parent.ContentSize = new CGSize (Frame.Width, Frame.Height);
}
SetNeedsLayout ();
SetNeedsDisplay ();
}
public void ClearAll()
{
foreach (var subview in Subviews)
subview.RemoveFromSuperview ();
root = null;
SetNeedsDisplay ();
}
// ******************** edit end 2 ********************* //
void SetFrame(NodeView node, CGRect frame)
{
node.Frame = frame;
if (node.LeftChild != null) {
var nodeHeight = HeightOfTheNode (node.LeftChild) + 1;
var nodeHeightForParentRight = HeightOfTheNode (node.RightChild) + 1;
if (nodeHeightForParentRight > nodeHeight)
nodeHeight = nodeHeightForParentRight;
SetFrame (node.LeftChild, new CGRect (frame.X - (nodeHeight * NodeWidth), frame.Y + NodeHeight + HeightDistanceBetweenLevels, NodeWidth, NodeHeight));
}
if (node.RightChild != null) {
var nodeHeight = HeightOfTheNode (node.RightChild) + 1;
var nodeHeightForParentLeft = HeightOfTheNode (node.LeftChild) + 1;
if (nodeHeightForParentLeft > nodeHeight)
nodeHeight = nodeHeightForParentLeft;
SetFrame (node.RightChild, new CGRect (frame.X + (NodeWidth * nodeHeight), frame.Y + NodeHeight + HeightDistanceBetweenLevels, NodeWidth, NodeHeight));
}
}
// ******************** edit start 2 ********************* //
void EditedSetFrame(NodeView node, CGRect frame)
{
node.Frame = frame;
if (node.LeftChild != null) {
EditedSetFrame (node.LeftChild, new CGRect (frame.X - (WidthDistanceBetweenAdjacentNodes * (Math.Pow(2,HeightOfTheNode(node.LeftChild)))), frame.Y + (NodeHeight + HeightDistanceBetweenLevels), NodeWidth, NodeHeight));
}
if (node.RightChild != null) {
EditedSetFrame (node.RightChild, new CGRect (frame.X + (WidthDistanceBetweenAdjacentNodes * (Math.Pow(2,HeightOfTheNode(node.RightChild)))), frame.Y + (NodeHeight + HeightDistanceBetweenLevels), NodeWidth, NodeHeight));
}
}
void drawLinesToChildren(CGContext context, NodeView node)
{
if (node.LeftChild != null) {
context.MoveTo (node.Frame.X + NodeWidth / 2, node.Frame.Y + NodeHeight);
context.AddLineToPoint (node.LeftChild.Frame.X + NodeWidth / 2, node.LeftChild.Frame.Y);
context.StrokePath ();
drawLinesToChildren (context, node.LeftChild);
}
if (node.RightChild != null) {
context.MoveTo (node.Frame.X + NodeWidth / 2, node.Frame.Y + NodeHeight);
context.AddLineToPoint (node.RightChild.Frame.X + NodeWidth / 2, node.RightChild.Frame.Y);
context.StrokePath ();
drawLinesToChildren (context, node.RightChild);
}
}