Adding a Rectangle object to a Panel

Question

I was able to add a button/label to a Panel like this; this.panel1.Controls.Add(this.button1); this.panel1.Controls.Add(this.label11); Works..OK! But, what I need is to add a Rectangle object to a Panel. I draw a Rectangle object; Graphics graph = this.CreateGraphics(); Pen penCurrent = new Pen(Color.Red); Rectangle Rect = new Rectangle(300, 50, 150, 75); graph.DrawRectangle(penCurrent, Rect); But when i do like this; this.panel1.Controls.Add(this.Rect); it gives an ERROR! ----- Says; Controls.Add() , works only for System.Windows.Forms.Control and CanNOT work with System.Drawing.Rectangle ----- So how can i achive this; add a Rectangle object to a Panel

Jan Montano · Answer

If I understand it correctly you could use the PictureBox's Resize event. and recreate your bitmap and adjust the size according to the pictureBox's size.

ugp · Answer

yes; option-01 is good i was able to put the rectangle as an image to a PictureBox. but need some more! When a PictureBox resize how to resize the inside picture/image according to the size of the PictureBox. (i.e: when the PictureBox enlarge should enlarge the picture as well according to the size of the PictureBox) need help!

Richard Blythe · Answer

I understand your confusion. However as the error message said you can only add objects that inherit from the base class: Control. I think I can help you achieve your objective. You have two options: (1) Add a picturebox to the form You can create the same rectangle. Paint it onto a bitmap Set the picturebox image to the painted bitmap. //Sample code Rectangle Rect = new Rectangle(300 50 150 75); Bitmap myBitmap = new Bitmap(Rect.WidthRect.Height); Graphics g = Graphics.FromImage(myBitmap); // always dispose the graphics object if you have created it g.Dispose(); pictureBox.Image = myBitmap; The second option takes a little more time to implement but it is more efficient (2) In the Designer view select the panel - click on the Properties window - Inside the window click the Events button (the lightning bolt) - Scroll down and find the Paint event - DoubleClick to generate an event handler. This the code you would insert inside the panel's Paint event. Note: This code assumes that the rectangle object has already been created. //Sample code Note: code will execute slightly faster if you use a predefined pen object e.Graphics.DrawRectangle( Pens .Red Rect); Hope this will help you! Richard