Alpha Splash Screen
lazarus / 39-Graphics

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lainz · 2011-03-21 16:31

How i can create an splash screen like:
http://sites.google.com/site/blingonmywrist2/iTunes_Splash_preview.JPG

or
http://blogs.msdn.com/blogfiles/visualstudio/WindowsLiveWriter/Behindt
heScenesSplashScreen_CC39/image_2.png

with transparency?

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circular · 2011-03-21 16:56

I see two ways :
- defining an alpha bitmap for the window (don't know if it's
available in Lazarus)
- taking a screenshot of the region where you want to draw, add your
elements on the bitmap, create a window without border with the bitmap
inside. It's kind of a workaround, because if you move something
behind, it won't appear.

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fabienwang · 2011-03-21 19:08

here is what i did for windows.
for multiplatform solution, there seems to be some Regions functions
in LCLIntf, but i haven't tried
(http://bugs.freepascal.org/view.php?id=1804 )

For windows, it's much simple:

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i
SetWindowLong(Handle, GWL_EXSTYLE, GetWindowLong(Handle, GWL_EXSTYLE)
or WS_EX_LAYERED);SetLayeredWindowAttributes(Handle,clBlack,255,LWA_CO
LORKEY);Note: replace clBlack by the transparent color you want to
set.

PS: i had to put "Brush.Style:= bsClear;" over it to get it to work.

PS2 ^^: Project demo added in SVN:
http://code.google.com/p/lazsamples/

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lainz · 2011-03-22 03:13

In this site a lot of info about splash screen alpha blended from bmp
and png:

picture:
http://melander.dk/wordpress/wp-
content/uploads/2008/05/alphasplash2shot.png

article:
http://melander.dk/articles/alphasplash

http://melander.dk/articles/alphasplash2/

but i don't know how to use it in Lazarus

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circular · 2011-03-22 12:10

This article works on Windows only. It uses an API to assign a
transparent Bitmap to a Window handle.

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rajivsoft · 2011-03-24 09:21

Quote from: lainz on March 21, 2011, 05:31:07 pmHow i can create an
splash screen like:
http://sites.google.com/site/blingonmywrist2/iTunes_Splash_preview.JPG

or
http://blogs.msdn.com/blogfiles/visualstudio/WindowsLiveWriter/Behindt
heScenesSplashScreen_CC39/image_2.png

with transparency?
for Mac OS X look here:
http://www.lazarus.freepascal.org/index.php/topic,8186.msg39863.html#m
sg39863

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Paul Ishenin · 2011-03-24 09:29

Use TWinControl.SetShape methods.