RE: Transparency?
RE: Transparency?
- Subject: RE: Transparency?
- From: "Huyler, Christopher M" <email@hidden>
- Date: Wed, 21 Apr 2004 10:32:15 -0400
- Thread-topic: Transparency?
When I lower the alpha number, the rectangle gets darker. An alpha
value of 0.0 (which should be completely transparent right?) comes out
as a black square.
-----Original Message-----
From: J Nozzi [
mailto:email@hidden]
Sent: Wednesday, April 21, 2004 10:26 AM
To: Huyler, Christopher M
Subject: Re: Transparency?
Try a lower alpha. Like 0.5 ... Your screen may not be calibrated
correctly (or close enough) to actually show any transparency with such
a slight transparency setting. The lower the alpha number, the more
transparency.
- J
On Apr 21, 2004, at 10:19 AM, Huyler, Christopher M wrote:
>
The Installer.app program has a cool looking transparency effect where
>
it has a slightly transparent white box, then the background image,
>
then
>
finally the striped background of the window. How do I do this in
>
cocoa?
>
>
I started by sub-classing an NSBox and rewriting the drawRect
function:
>
>
- (void) drawRect:(NSRect) frame
>
{
>
NSRect rect=[self frame];
>
[super drawRect:frame];
>
rect.origin=NSMakePoint(1,1);
>
rect.size.width-=2;
>
rect.size.height-=2;
>
>
[[NSColor colorWithCalibratedWhite:1.0 alpha:0.9] set ];
>
NSRectFill(rect);
>
}
>
>
However, the box does not end up being transparent. Instead it is just
>
off-white. Can someone point me in the right direction?
>
>
--
>
Christopher Huyler
>
Computer Associates Intl.
>
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