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Posted 17 Mar 2003

Drawing Lines And Rectangles Using the Mouse

, 17 Mar 2003
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Simple program utilizing the mouse to draw lines and rectangles.

Sample Image - linerect.jpg


This is my first program submittal to this site. I wrote this tiny snippet of code to show how to draw simple lines and rectangles in VS.NET using C#. The program is not perfect. The main problem to the procedure is, it doesn't bound the user from drawing beyond the form's boundary. Perhaps when I have time, I'll look into the ability to limit the selection process to the form. One solution would be to check the mouse pointer location on the form and restrict the user from going beyond the form's boundary. If anyone comes up with a better idea, please post your comments or solutions.

There were several submittals to this site regarding drawing selection rectangles and rubberband lines. For those of you who ran across these submittals, you might want to take a look at this tiny program to get some ideas.

The main trick to this program is in the mouse move:

if (((RadioButton)thisform.Controls[0]).Checked) 
                           thisform.PointToScreen(pe), Color.Black);
   pe = new Point(e.X, e.Y);
                           thisform.PointToScreen(pe), Color.Black);
                           Color.Black, FrameStyle.Dashed);
   SelectRect.Width = e.X - SelectRect.X;
   SelectRect.Height = e.Y - SelectRect.Y;
                           Color.Black, FrameStyle.Dashed);

The DrawReversible procedures toggle the drawing between the specified color and the background color. Also, you will need to attain the screen coordinates in order to begin drawing where the mouse is pointed to on the form.

I hope this program helps beginning control builders to gain some ideas on .NET drawing procedures.


This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here


About the Author

Web Developer
United States United States
A software programmer hobbyist who have been developing for a number of years spanning multiple languages and platforms.

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Comments and Discussions

QuestionForm cleaned when it minimized and remaximized Pin
Member 906895426-Jul-15 8:47
memberMember 906895426-Jul-15 8:47 
GeneralDrawing Lines And Rectangles Using the Mouse in Picture Box Pin
MrKyaw15-Jul-12 23:03
memberMrKyaw15-Jul-12 23:03 
Dear All,

How can I do in picture box since i was stuck on it?

Please advise me since I was stuck on it and I am rushing on it.

I forgot to tell you that my draw rectangle(ROI-Region of Interest) is on the video streaming so drawrectangle function no issue for still image but not for live one.

Best regards

modified 16-Jul-12 4:27am.

GeneralMy vote of 5 Pin
takerman26-Apr-12 11:12
membertakerman26-Apr-12 11:12 
GeneralMy vote of 5 Pin
manoj kumar choubey20-Feb-12 1:04
membermanoj kumar choubey20-Feb-12 1:04 
Generalwe can correct this example by this code Pin
yummysms16-Feb-10 2:12
memberyummysms16-Feb-10 2:12 
QuestionWhere is the source code? Pin
RDurando6-Nov-08 0:18
memberRDurando6-Nov-08 0:18 
AnswerRe: Where is the source code? Pin
Sickness16-Feb-09 8:11
memberSickness16-Feb-09 8:11 
GeneralCursor.Clip Pin
tomzhu102413-Dec-07 23:07
membertomzhu102413-Dec-07 23:07 
GeneralMore Explaination! Pin
robert11029-Sep-06 7:00
memberrobert11029-Sep-06 7:00 
GeneralRedrawing lines and rectangle Pin
mitreviper11-May-04 0:49
membermitreviper11-May-04 0:49 
GeneralRe: Redrawing lines and rectangle Pin
MadHatter ¢21-Jan-05 18:53
MadHatter ¢
21-Jan-05 18:53 
GeneralStopping th cursor leaving the form Pin
Roger Allen19-Mar-03 7:18
memberRoger Allen19-Mar-03 7:18 
GeneralRe: Stopping th cursor leaving the form Pin
Anonymous5-Jan-04 5:42
sussAnonymous5-Jan-04 5:42 
GeneralComments. Pin
73Zeppelin18-Mar-03 17:14
member73Zeppelin18-Mar-03 17:14 
GeneralRe: Comments. Pin
Bill Lien18-Mar-03 21:58
sussBill Lien18-Mar-03 21:58 
GeneralRe: Comments. Pin
Vlad Vissoultchev19-Mar-03 5:37
memberVlad Vissoultchev19-Mar-03 5:37 
GeneralArticle format Pin
Steve McLenithan18-Mar-03 16:57
memberSteve McLenithan18-Mar-03 16:57 

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