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PictureBox and Transparent

Posted on 2003-12-09
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Last Modified: 2008-02-01
Hi,

I am using VC.net 2003.  I have a WinForm and on that I put a picturebox.  I am trying to show a round LED with a 16x16 bmp.  The problem is, since the corners are some color, in my case olive, the picture doesn't look right.  I am used to Delphi/Borland C++ Builder where I just need to set the Transparent property to true.  How do I accomplish the same thing in VC.net?  I want to be able to change the color of the form (or whatever I eventually place the picturebox on) and still only see the round image.

Thank you,
Joe
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Question by:joeslow
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Expert Comment

by:Bob Learned
ID: 9915128
I am a VB programmer, with a little experience with C++.  I wouldn't be afraid to try to help, since no one else seems to want to get involved, if you are still having problems?
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Author Comment

by:joeslow
ID: 9915524
I think I figured it out how to do it programmatically:

First, I load the image in an imagelist because that lets me select the transparent color (olive in my case).  Then I assign it to the picture box at runtime like this:

pictureBox1->Image = imageList1->Images->Item[0];

This seems to work.  I don't see a way to do it at design time however.  If you have any ideas, let me know.

Thanks,
Joe
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Expert Comment

by:Bob Learned
ID: 9915530
My first question would be, could you use a transparent GIF?
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Expert Comment

by:Bob Learned
ID: 9930609
Are you still having a problem with this?  Did my question make sense?
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Author Comment

by:joeslow
ID: 9941936
I guess so.  Although I have access to more bmp files...
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Expert Comment

by:Bob Learned
ID: 9942598
I can't think of any other way to do it in design-mode right now.
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Author Comment

by:joeslow
ID: 9945020
So, the solution I came up with is OK?

Joe
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Expert Comment

by:Bob Learned
ID: 9945107
Most of the time I don't concern myself with design-time issues, and I get into placing controls where I want them at run-time.  Your solution is OK as far as I am concerned.  I was just trying to show you an alternative with transparent GIFs or icons that would give you the transparency that you want at design time.  I understand, though, having bitmaps, and not wanting to convert them all.

My normal mode of operation is to keep around a huge collection of 16 x 16 bit icons whenever I need them, and not to use bitmaps.
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Author Comment

by:joeslow
ID: 9950866
Go ahead and show me.  I'm not opposed to icons or gifs I just don't have as many to choose from (maybe you know of some good free sources).

Thanks,
Joe
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Expert Comment

by:Bob Learned
ID: 9950882
Show you what?  How to convert bitmaps to transparent GIFs/Icons?
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Author Comment

by:joeslow
ID: 9951205
Are you saying you can create icons and gifs that are already have transparent regions and you can't do that with bitmaps?  If that's the case, I guess you don't have to do anything when you add them to a picture box...

Joe
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Accepted Solution

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Bob Learned earned 200 total points
ID: 9951240
Icons and GIFs have the ability for transparency, where bitmaps do not.  I have tools, such as ImageEdit (from VB6), and the image editor in VS.NET (I don't use this one very much), to create icons.

When I need to create a transparent GIF, then I use something like Micro$oft's PhotoDraw 2000.  It has the ability to set transparency for GIF files.

With images that have a transparency, the picture box will draw them with the transparency, so what you see is what you get.
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Author Comment

by:joeslow
ID: 9952167
Thanks for the info - I guess I'll try to find some good ones for my app, otherwise, I'll set it at run time...

Joe
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by:Bob Learned
ID: 9952178
Have fun!

Bob
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