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Thread: draw semi transparent rectangle

  1. Oct 14th, 2004, 05:07 AM #1
    per-i
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    Question draw semi transparent rectangle

    Hi all,

    does anybody know how to create a semi-transparent filled rectangle on a object? I can draw filled, gradient filled rectangles without any problem. But i now have something in which they need to be semi transparent.

    Regards,

    per-i
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  2. Oct 14th, 2004, 11:30 AM #2
    RhinoBull
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    You will ahve to do alpha blending.
    There is a sample @vbaccelerator.com:

    http://www.vbaccelerator.com/home/VB...on/article.asp

    There is also very nice sample by Karl E. Peterson but it only works in Win2K but take a look at it.
    Go to http://www.mvps.org/vb/index2.html?samples.htm and download Translucent.zip
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  3. Oct 14th, 2004, 01:31 PM #3
    RobDog888
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    We also have some good stuff here in the Forums too!

    Alpha + Blend

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  4. Oct 15th, 2004, 02:58 AM #4
    per-i
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    Hi all,

    RobDog888 the link you gave if for alphablending a form. It requires a Hwnd. I need to alpha blend a rectangle over a control. The control has got a userdrawn event which allows you to do this. It provides you with the measurements of the rectangle and gives you a Hdc for the rectangle. I use alpha blending with form already in my program though.

    The sample from vbaccelerator seems to use a Hdc and standard GDI.

    The second link doesn't seem to work though

    Regards,,

    per-i
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