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Home » U++ Library support » Draw, Display, Images, Bitmaps, Icons » How must Alpha be managed ??
Re: How must Alpha be managed ?? [message #38534 is a reply to message #38533] Fri, 21 December 2012 22:31 Go to previous messageGo to previous message
Didier is currently offline  Didier
Messages: 736
Registered: November 2008
Location: France
Contributor
Hi Omari,

I'm not trying to draw empty rectangles or ellipstes.

What I'm trying to do is manage the Alpha value which gives the information about "how transparent it is" or "how opaque it is".

This I can do without any problem but I don't know what to put in alphaColor and alphaValue values :
ImageDraw iw(rect.Width(), rect.Height());
iw.Alpha().DrawRect(bandRect, GrayColor(e.alphaValue));
iw.Alpha().DrawEllipse(circleRect, GrayColor(e.alphaValue));
w.DrawImage( rect, iw , e.alphaColor);

in order to get the same result as if id did:
w.DrawImage(bandRect, e.bandStyle );

where bandStyle is an image containing RGBA pixels where ALPHA is not 255 nor 0

Look at the example I uploaded

[Updated on: Fri, 21 December 2012 22:32]

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