# I Want To Create Quadtree

*label*Programming

*timer*Asked: Jul 14th, 2013

*account_balance_wallet*$5

### Question Description

I create Quad tree code . I want to get 10 point from database and put them in Quad tree's leaves but it doesn't work correctly.for example random point is (449.6745,411.1505) and range detected is 88 < x < 89 and 411 < y < 412 but it isn't correct . range should be 449 < x < 450 and 411 < y < 412 . Thanks Here is my code:

public class QuadTree { public TreeNode MainRoot; bool Switch = false; public QuadTree(Rectangle R) { MainRoot = new TreeNode(); MainRoot.Rectangle = R; MainRoot.LeftChild = null; MainRoot.RightChild = null; } public void CreateTree(TreeNode Root, Rectangle R, bool Switch) { if (Root.Rectangle.Width <=1 && Root.Rectangle.Height <=1 ) { return; } Root.LeftChild = new TreeNode(); Root.RightChild = new TreeNode(); if (!Switch) { Root.LeftChild.Rectangle = new Rectangle(R.X, R.Y, R.Width / 2, R.Height); Root.RightChild.Rectangle = new Rectangle(R.X + R.Width / 2, R.Y, R.Width / 2, R.Height); } if (Switch) { Root.LeftChild.Rectangle = new Rectangle(R.X, R.Y, R.Width, R.Height / 2); Root.RightChild.Rectangle = new Rectangle(R.X, R.Y - R.Height / 2, R.Width, R.Height / 2); } CreateTree(Root.LeftChild, Root.LeftChild.Rectangle, !Switch); CreateTree(Root.RightChild, Root.RightChild.Rectangle, !Switch); } //***************************************************************************************** double x, y; public void SearchPoint(TreeNode Root) { bool sw = false; SqlConnection scon = new SqlConnection("Data Source=GATEWAY-PC;Initial Catalog=QuadTree;Integrated Security=True"); scon.Open(); SqlCommand scom = new SqlCommand("delete from PointArea", scon); scom.ExecuteNonQuery(); for (int i = 1; i <= 10; i++) { TreeNode Current = new TreeNode(); TreeNode T = new TreeNode(); T = Root; Current = Root; SqlDataReader s = new SqlCommand("select X,Y from Coordinate where ID='" + i + "'", scon).ExecuteReader(); while (s.Read()) { x = Convert.ToDouble(s["X"]); y = Convert.ToDouble(s["Y"]); } s.Close(); while (Current != null /*&& (Current.Rectangle.Width > 1 || Root.Rectangle.Height > 1)*/) { if (!sw) { if (x >= Current.Rectangle.X && x <= (Current.Rectangle.X + Current.Rectangle.Width / 2)) { T = Current; Current = Current.LeftChild; } else if (x >= (Current.Rectangle.X + Current.Rectangle.Width / 2) && x <= Current.Rectangle.X + Current.Rectangle.Width) { T = Current; Current = Current.RightChild; } } if (sw) { if (y <= Current.Rectangle.Y && y >= (Current.Rectangle.Y - Current.Rectangle.Height / 2)) { T = Current; Current = Current.LeftChild; } else if (y <= (Current.Rectangle.Y - Current.Rectangle.Height / 2) && y >= Current.Rectangle.Y - Current.Rectangle.Height) { T = Current; Current = Current.RightChild; } } sw = !sw; } SqlCommand sq = new SqlCommand("insert into PointArea values('" + i + "','" + T.Rectangle.X + "','" + (T.Rectangle.X + T.Rectangle.Width) + "','" + (T.Rectangle.Y - T.Rectangle.Height) + "' ,'" + T.Rectangle.Y + "')", scon); sq.ExecuteNonQuery(); T.PointX = x; T.PointY = y; } scon.Close(); }

## Tutor Answer

Thank you for the opportunity to help you with your question!

In most cases, the discipline is self-governed by the entities which require the programming, and sometimes very strict environments are defined

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