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An NSShadow question
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An NSShadow question


  • Subject: An NSShadow question
  • From: Steve Sims <email@hidden>
  • Date: Fri, 2 Apr 2004 01:17:33 -0500

Hi all,

NSShadow is a really nice idea, but I don't seem to be able to get it to do quite what I want.

Here's the problem. I have a closed bezier in an NSBezierPath object with a wide outline (about 10 units). I set up an NSShadow with a reasonable offset (about 20, 20 units) and apply it using the set method so that when I draw my bezier I'll get a shadow. I then draw my bezier using stroke then fill. The shadow that gets drawn has a darker section of shadow where the stroke and fill overlap. Also the shadow for the fill is rendered on top of the stroked path. This looks bizarre and is not what I want.

Now the Quartz TLayer sample code kind of solves this problem with all shadows being drawn behind all other drawn objects, however it manages this by not using NSShadow, but rather using CG API calls. It does this by using a transparency layer.

I tried to use the same CG API calls that TLayer uses together with NSShadow, but this does not work - the CG calls seem to be ignored. My solution has been to abandon using NSShadow.

So my question is do I really have to abandon NSShadow, or is there a way to persuade it to work with a transparency layer?

Steve
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