RE: Transparency?
RE: Transparency?
- Subject: RE: Transparency?
- From: "Huyler, Christopher M" <email@hidden>
- Date: Wed, 21 Apr 2004 11:27:25 -0400
- Thread-topic: Transparency?
At this point, nothing is in the NSBox. If I remove the NSRectFill
call, I end up with an invisible box.
I just tried the following which also didn't work. The color of the box
is still gray instead of being completely white.
[[NSColor whiteColor] set];
NSRecFill(rect);
[[NSColor colorWithCalibratedWhite:1.0 alpha:0.2] set];
NSRectFill(rect);
Installer uses a Custom View so everything appears to be programmatic.
-----Original Message-----
From: Nicko van Someren [
mailto:email@hidden]
Sent: Wednesday, April 21, 2004 11:01 AM
To: Huyler, Christopher M
Cc: J Nozzi; email@hidden
Subject: Re: Transparency?
You are right that alpha of 1.0 is opaque and 0.0 is transparent.
What's in the content view of the NSBox? Also, what happens if you
remove the NSRectFill call? If the content is black then you'd get the
behaviour you are seeing.
Nicko
On 21 Apr 2004, at 15:32, Huyler, Christopher M wrote:
>
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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