NSColor to CGColor
-
Hi,
Couldn't find any pointers in the Apple docs (other than that the two
types appear not to be toll-free bridged), and amazingly searching in
cocoabuilder on "CGColor" yields no results at all. Nada. So no info
on converting an NSColor to a CGColor. Googling for these two words
yields no usable results either, so hence the question here: What is
the best/easiest way to convert an NSColor to a CGColor?
Thanks,
António
-----------------------------------------------------------
And could you keep your heart in wonder
at the daily miracles of your life,
your pain would not seem less wondrous
than your joy.
--Kahlil Gibran
----------------------------------------------------------- -
On 12 nov 2006, at 16.32, Antonio Nunes wrote:
> Couldn't find any pointers in the Apple docs (other than that the
> two types appear not to be toll-free bridged), and amazingly
> searching in cocoabuilder on "CGColor" yields no results at all.
> Nada. So no info on converting an NSColor to a CGColor. Googling
> for these two words yields no usable results either, so hence the
> question here: What is the best/easiest way to convert an NSColor
> to a CGColor?
I also bumped into this problem recently and ended up implementing
this function:
static CGColorRef CGColorCreateFromNSColor (CGColorSpaceRef
colorSpace, NSColor *color)
{
NSColor *deviceColor = [color colorUsingColorSpaceName:
NSDeviceRGBColorSpace];
float components[4];
[deviceColor getRed: &components[0] green: &components[1] blue:
&components[2] alpha: &components[3]];
return CGColorCreate (colorSpace, components);
}
That I call like this:
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB ();
CGColorRef cgColor = CGColorCreateFromNSColor (colorSpace, nsColor);
CGColorSpaceRelease (colorSpace);
// Do stuff with cgColor
CGColorRelease (cgColor);
j o a r -
On Nov 12, 2006, at 10:32 AM, Antonio Nunes wrote:
> Hi,
>
> Couldn't find any pointers in the Apple docs (other than that the
> two types appear not to be toll-free bridged), and amazingly
> searching in cocoabuilder on "CGColor" yields no results at all.
> Nada. So no info on converting an NSColor to a CGColor. Googling
> for these two words yields no usable results either, so hence the
> question here: What is the best/easiest way to convert an NSColor
> to a CGColor?
>
> Thanks,
> António
When I've had to do this I've just init'ed a new CGColor based on the
components of the NSColor. Something like:
NSColor* someNSColor = [NSColor redColor];
CGColorRef someCGColor = NULL;
CGColorSpaceRef genericRGBSpace = CGColorSpaceCreateWithName
(kCGColorSpaceGenericRGB);
if (genericRGBSpace != NULL)
{
float colorComponents[4] = = {[someNSColor redComponent],
[someNSColor greenComponent], [someNSColor blueComponent],
[someNSColor alphaComponent]};
someCGColor = CGColorCreate(genericRGBSpace, colorComponents);
CGColorSpaceRelease(genericRGBSpace);
}
// got someCGColor? have fun...
Apply colorspace finickiness as necessary...
Daniel -
On Nov 12, 2006, at 10:48 AM, j o a r wrote:
> static CGColorRef CGColorCreateFromNSColor (CGColorSpaceRef
> colorSpace, NSColor *color)
> {
> NSColor *deviceColor = [color colorUsingColorSpaceName:
> NSDeviceRGBColorSpace];
>
> float components[4];
> [deviceColor getRed: &components[0] green: &components[1] blue:
> &components[2] alpha: &components[3]];
>
> return CGColorCreate (colorSpace, components);
> }
Joar's is much smarter and generically applicable than the example I
pasted....
Daniel -
On 12 nov 2006, at 16.58, Daniel Jalkut wrote:
> Joar's is much smarter and generically applicable than the example
> I pasted....
Thanx!
Though, I should note that my version is not universally applicable -
for example it doesn't work for all types of NSColor! The return
value from "-[NSColor colorUsingColorSpaceName:]" should be checked
(as it can be nil), and depending on how this code will be used,
there might be other places where you would want to check return values.
j o a r -
On 12 Nov 2006, at 15:48, j o a r wrote:
> I also bumped into this problem recently and ended up implementing
> this function:
>
>
> static CGColorRef CGColorCreateFromNSColor (CGColorSpaceRef
> colorSpace, NSColor *color)
> {
> NSColor *deviceColor = [color colorUsingColorSpaceName:
> NSDeviceRGBColorSpace];
>
> float components[4];
> [deviceColor getRed: &components[0] green: &components[1] blue:
> &components[2] alpha: &components[3]];
>
> return CGColorCreate (colorSpace, components);
> }
>
>
> That I call like this:
>
>
> CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB ();
> CGColorRef cgColor = CGColorCreateFromNSColor (colorSpace, nsColor);
> CGColorSpaceRelease (colorSpace);
> // Do stuff with cgColor
> CGColorRelease (cgColor);
Thanks Joar (and Daniel),
The above should do just fine for my purposes. I had a feeling it
might be something of the sort, but wanted to make sure I wasn't
overlooking anything.
Cheers,
António
-----------------------------------------------------------
And could you keep your heart in wonder
at the daily miracles of your life,
your pain would not seem less wondrous
than your joy.
--Kahlil Gibran
----------------------------------------------------------- -
Am 12.11.2006 um 16:48 schrieb j o a r:
> I also bumped into this problem recently and ended up implementing
> this function:
>
> static CGColorRef CGColorCreateFromNSColor (CGColorSpaceRef
> colorSpace, NSColor *color)
> {
> NSColor *deviceColor = [color colorUsingColorSpaceName:
> NSDeviceRGBColorSpace];
>
> float components[4];
> [deviceColor getRed: &components[0] green: &components[1] blue:
> &components[2] alpha: &components[3]];
>
> return CGColorCreate (colorSpace, components);
> }
Well, if someone passes in a CMYK color, this may cause the color to
change slightly. So, it may be desirable to check color's
colorSpaceName and, where possible, use an equivalent CGColorSpaceRef
etc.
Cheers,
-- M. Uli Kusterer
http://www.zathras.de
