I want to set the Background color of my form to transparent. I know that this is possible by setting TransparencyKey, but this wont work for me because I have an image with different alpha values rendered on the form. I tried to overwrite the OnPaintBackground method but then I get a black background. Is there a better way to set the forms background transparency?
That cannot work, a transparent color lets the background shine through. But a form's background doesn't itself have a background. You'll see whatever the pixels were initialized to in the video adapter's frame buffer when the window was created. Which is normally white, it will be black on some machines if you used the Opacity or TransparencyKey properties.
To punch a hole through the window itself so you see whatever windows are behind it you must use a layered window. Where the video adapter itself combines the pixels in the frame buffer with the pixels of your window, stored in a separate overlay. The same kind of effect you see used on television with the weather man standing in front of the weather map, called color-keying.
Which is trivial to do, simply set the form's BackColor to the same value as the TransparencyKey property. Pick an "unusual" color that doesn't appear anywhere else in the window, Color.Fuchsia is an excellent fuchsed-up color.
Don't set the TransparencyKey. Set the Opacity:
this.Opacity = 0.5d;
Note: This makes the whole window (semi-)transparent, including its borders and header! If you set it to 0.0d it will be completely invisible!
You still need to paint background for it to be transparent (or well you will see that black background).
protected override void OnPaintBackground(PaintEventArgs e)
{
using (SolidBrush brush = new SolidBrush(this.TransparencyKey))
e.Graphics.FillRectangle(brush, ClientRectangle);
}
Don't forget to set transparency key and backcolor
TransparencyKey = BackColor = Color.LavenderBlush; // to example
and user paint style.
Related
I have a form that I want to use with background, when I'm loading the background all my labels and richtexts still have as backcolor "Control", when I choose "Transparent" for the labels it's working, but when I choose it for the richtexts I', getting the error: "Control does not support transparent background colors."
How can I fix this?
NO you can't?
set TransparencyKey of window to control background color
setting this property will make this color transparent on whole window
use two windows overlapping each other one with background and another with your controls with transparency key
In Win Form, we can create non-rectangular forms by creating a bitmap that have a background color like blue. So, we can set it to background image of Win Form and with change TransparencyKey option to blue, we have a shaped-window.
So, my question is What is the equivalency to TransparencyKey in WPF that does like Win Form's TransparencyKey?
Thanks for your attention :)
There is no equivalent.
Just use an image with transparent areas (so it has to be a PNG or GIF), set the WindowStyle to None, set the window's background to Transparent, and set AllowTransparency to true.
Transparent areas will not be clickable.
Set AllowTransparency to true then use pixel shader effect library for wpf.
Use this link for more details about how to use pixel shader : Green screen in wpf
I want to make the background of a PictureBox control transparent. In the PictureBox (rectangular shape), I placed an icon (circular in shape). I want to make the icon transparent so that the other portion underneath the icon is visible.
I have tried setting the PictureBox.BackColor property to "Transparent", but it doesn't work. I also tried to set it during runtime with the Color.FromArgb method, but it doesn't work either.
Is there any solution to this problem?
Setting pictureBox.BackColor = Color.Transparent; definitely should work.
Also verify if you are setting alpha channel of color when using Color.FromArgb(0, 0, 0, 0); (this is a first parameter, zero means transparent color)
And, of course, make sure your icons have transparent background.
If using WinForms then Setting the background color to transparent won't work as transparency handling is not a cascading system - you can only (in most cases) set transparency (or rather the opacity) of a control overall using the Opacity property, however this will alter the alpha channel of the entire control display giving your images a see-througness.
One solution might be to set the background color of the PictureBox to be that of the control beneath it (the color of the form, for example). But this may not suffice in your situation.
hi you must set the icon on the other portion underneath the icon by using this
icon_pictureBox_name.Controls.Add(other_portion_picturBox_name);
and after that you can set the PictureBox.BackColor property to "Transparent" and it will work ;)
how to make any control of win application transparent. i want that i will assign a background image for the target control and will invoke a routine and that routine will create that control transparent in such a way that only image will visible. as a example suppose image has assign to picture box. the picture shape is not square rather irregular. if i can make picture box transparent then user will see the image only. basically i want to make a picture box or any control irregular shape. how to achieve it through code in c#.
thanks
In WPF, transparency is quasi for free. For the image-element, assign a png-image with an alpha mask and the image will be rendered with active transparency.
For controls with an solid background, you generally have to set the Background to a transparent Brush:
If you want to make a whole window partial transparent, you have to remove the border, set the window style to none, set the background brush to a transparent brush, and set the AllowsTransparency-property of the window to true.
there is one for ordinary winform at
http://www.youtube.com/watch?v=K_JzL4kzCoE
Question:
How do I scrape what a transparent panel shows into a bitmap?
Background:
I need to make a form that sits on top of everything and blurs part of the screen but doesn't stop the user from interacting with it. Odd... I know.
I created a form and added a panel to it. I then set the set background color of the panel to red. Then set the form's TransparentKey property to red and topmost = True.
So now I have a transparent panel. Cool. I can interact with the app below it. Cool. Now I just need to add the blur. I would like to take what is showing on panel1 and blur it then display on panel2 that sits over the top of panel1. Or at least that is the idea.
Important detail:
DrawToBitmap() just shows the red background.
This is running on XP.
Yes, DrawToBitmap(). But not on the transparent panel, on the one that's underneath it. If that 'panel' isn't actually yours then you have to use Graphics.CopyFromScreen().
Not sure what you intend to do with it, but drawing the blurred image in the transparent panel will make it non-transparent and you cannot interact with the underlying window anymore. Also, don't use Red, you'll get unintended transparency if the underlying window contains any red. Color.Fuchsia is a good choice, it is a fuchsed-up color.