Is there some reason why you can't use the color picker to specify a color+alpha value? It would save you a bunch of work in duplicating existing system functionality.

On Sep 24, 2009, at 11:20 PM, Symadept wrote:

Hi Graham,
Yes. But do you have any other ways to handle this.

I want something like this


I could be able to pick the color from the spectrum band and could change the Alpha (This I can manage to some extent, Immediately I need to handle
the picking colour from the spectrum.)

Regards
Mustafa

On Fri, Sep 25, 2009 at 1:41 PM, Graham Cox <graham....@bigpond.com> wrote:


On 25/09/2009, at 1:14 PM, Symadept wrote:

Can any help me how to create a view which contains Spectrum Bar (Just as
RGB Sphere in NSColorPanel) and an Alpha bar?


NSImageView?

--Graham

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