There's a far easier way to do it than that, which is to use
compositing instead of clipping.
On Dec 17, 2009, at 9:49 PM, Gordon Apple wrote:
If you capture the entire laid-out text string as a single Bezier
path,
then you can fill it with whatever you want -- gradient, image,
burning fire
QTMovie, more text, etc. I've done it and it works. Of course, all
of that
takes a significant amount of effort. In my case, I already had all
the
fill mechanisms, so all I had to do was get the Bezier Path.
The SpeedyCatagories file in the SpeedometerView example has most of
what
you need to get the Bezier. You have to modify it somewhat to get
everything you need.
On 12/17/09 8:29 PM, "cocoa-dev-requ...@lists.apple.com"
<cocoa-dev-requ...@lists.apple.com> wrote:
On 18/12/2009, at 4:31 AM, Chris Purcell wrote:
I've tried setting the gradient as NSForegroundColorAttributeName
in the
attributes dictionary when creating the string but as I expected
that didn't
work. How would I go about filling the string with a gradient?
Why would you even expect that to work? NSGradient is not a colour.
At present
there is no supported attribute for gradients.
You could create this effect by converting the string to its glyphs
as a path
and fill the path. Alternatively you can create a subclass of
NSLayoutManager
and override the method:
- (void)showPackedGlyphs:(char *)glyphs
length:(NSUInteger)glyphLenglyphRange:(NSRange)glyphRange
atPoint:(NSPoint)point font:(NSFont *)font color:(NSColor*)color
printingAdjustment:(NSSize)printingAdjustment
and render the glyphs using a gradient. Doing that implies you'll
need to set
up a text system programatically, which is a fairly advanced topic
- see:
http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/TextArch
itecture/TextArchitecture.pdf
--Graham
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