Rotating a .NET panel in Windows Forms

Question

We use Windows Forms and custom user controls, and I would like to be able to rotate the panel hosting the userControl in a particular form. I have seen similar functionnalities with WPF, but I can't use it for the moment. Is it possible to achieve the rotation of a panel and its children using possibly built-in .NET methods or GDI+?

I have seen some pretty cool visual effect with menus that are displayed in game development, so I was wondering if it would be possible to create similar effects using Windows Forms.

Possible duplicate of *[C# vertical label in a Windows Forms](http://stackoverflow.com/questions/1371943/c-sharp-vertical-label-in-a-windows-forms)*. — Peter Mortensen, Jan 16 '14 at 09:23

score 2 · Answer 1 · answered Dec 08 '09 at 02:19

You can use rotations in GDI+ by calling the RotateTransform method on a Graphics object.

However, rotating an entire control is not so simple, and will depend heavily on how the control is implemented.
If it's a composite UserControl that has other controls inside of it, you're out of luck.
If it's a sinlge control that paints itself, try inheriting the control, overriding the OnPaint method, and calling RotateTransform on the Graphics object. However, you will probably have trouble with it. In particular, you will probably need to override all of the mouse events and call the base control's events with rotated coordinates.

score 2 · Accepted Answer · edited Jan 16 '14 at 08:56

2

Rotating a panel and its children in Windows Forms is not something directly supported, and I think it will end up being a buggy headache that could easily suck up lots of time. It's especially painful to think about when you could do this in WPF with zero lines of C# code and only a tiny bit of XAML.

edited Jan 16 '14 at 08:56

Peter Mortensen

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answered Dec 08 '09 at 03:04

Brian Ensink

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How can I rotate the panel with WPF? pls, see my question http://stackoverflow.com/questions/15499764/rotate-a-panel-90?noredirect=1#comment21945525_15499764 – Ladessa Mar 19 '13 at 13:10

score 1 · Answer 3 · edited Jul 06 '20 at 06:21

You can get halfway there by calling the DrawToBitmap method on your panel, then rotating the bitmap and displaying it e.g. in a PictureBox:

var bitmap = new Bitmap(panel.Width, panel.Height);
panel.DrawToBitmap(bitmap, new Rectangle(Point.Empty, panel.Size));
bitmap.RotateFlip(RotateFlipType.Rotate270FlipNone);

var pictureBox = new PictureBox();

pictureBox.Location = panel.Location;
pictureBox.SizeMode = PictureBoxSizeMode.AutoSize;
pictureBox.Image = bitmap;

Controls.Remove(panel);
Controls.Add(pictureBox);

Rotation angles other than 90-degree increments are also possible, if you draw the bitmap into another bitmap using GDI:

var bitmap2  = new Bitmap(bmp.Width + 75, bmp.Height + 100);
var graphics = Graphics.FromImage(bmp2);

graphics.TranslateTransform(bitmap2.Width / 2, bitmap2.Height / 2);
graphics.RotateTransform(-15f);
graphics.TranslateTransform(-bitmap.Width / 2, -bitmap.Height / 2);
graphics.DrawImageUnscaled(bitmap, Point.Empty);
graphics.Dispose();

The problem of course is that you're only displaying an image of your panel, and not the panel itself, so it's no longer possible to interact with the controls inside.

That could probably be done as well, but you would have to mess with window messages, which gets quite a bit more complicated. Depending on your needs you might also be able to get away with handling click and key events on the PictureBox, manipulating the controls in the panel, and then updating the image.

Rotating a .NET panel in Windows Forms

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