Adding a Rectangle object to a Panel

ugp

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

3 Replies

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Jan Montano19y ago
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.
ugp19y ago
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 Blythe19y ago
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.Width,Rect.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