Draw a Line between Two Checked List Items of Two CheckedListBoxes

I saw a message on the SLDotnetDevelopers2005 ( http://groups.yahoo.com/group/SLDotNetDevelopers2005/ ) posted by a sri lankan developer named shiran.

Shiran wanted to draw a line between two checkedlistItems of two checkedlistboxes on a windows form. Similar to the SQL server Design Query View. Given below is my answer I gave to him.

( Hey hey shiran you must be upto something very interesting .....??? )

Hello Shiran,

I have given below the most primitive approch that you can get this solved using the GDI+.

I think you may have time to improve it more to suite your need.

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//Add Items to the 1st CheckedListBox

checkedListBox1.Items.Add"ABC",true);

checkedListBox1.Items.Add("DEF",true);

checkedListBox1.Items.Add("GHI",true);

checkedListBox1.Items.Add("JKL",true);

//Add Items to the 2nd CheckedListBox

checkedListBox2.Items.Add("123",true);

checkedListBox2.Items.Add("456",true);

checkedListBox2.Items.Add("789",true);

checkedListBox2.Items.Add("111",true);

checkedListBox2.Items.Add("222",true);

checkedListBox2.Items.Add("333",true);

// Get the Fourth Items Rectangle of the First CheckedListBox

System.Drawing.Rectangle FromRectangle = this.RectangleToClient(checkedListBox1.RectangleToScreen(checkedListBox1.GetItemRectangle(3)));

// Get the Third Items Rectangle of the Second CheckedListBox

System.Drawing.Rectangle ToRectangle = this.RectangleToClient(checkedListBox2.RectangleToScreen(checkedListBox2.GetItemRectangle(2)));

//Create a Graphics Object

System.Drawing.Graphics graphics = this.CreateGraphics();

//Create Points From Screen Rectangles

Point FromPoint = FromRectangle.Location;

Point ToPoint = ToRectangle.Location;

//Draw the Line From Start Point To the End Point

graphics.DrawLine(Pens.Black,
FromRectangle.X,
FromRectangle.Y,
ToRectangle.X,
ToRectangle.Y);

//Dispose Graphics Object

graphics.Dispose();

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If you have any more questions do not hesitate to throw it to us.

Bye

Lolitha Samarajeewa

P.S:

I have searched google for you and came up with one link(since i don't have much time these days ;-) )

http://www.c-sharpcorner.com/2/gdi_plus.asp

You better search on MSDN also where you get more samples.