Right -- unfortunately patterns (in the QD sense) aren't something easily
supported cross-platform. But what you can do is draw your borders into the
mask of a picture, the image of which has been filled with an appropriate
pattern. Then draw this picture to the final graphics context.
But if I fill the mask with a zebra pattern, draw the the borders into
this mask, then if I draw this picture into the final graphics
context, that will change my entire underlying image (atop which I
want to draw just a dashed outline) into a zebra, no?
Of course, you'll notice that you don't see the marching-ants selection style
in Apple apps anymore -- the more fashionable look these days seems to be the
translucent region, which is actually quite a bit easier to do (on OS X, at
least) with the Object2D classes.
I do realize that marching ants is passé. Is there another way, eg.
passing an RB Object2D to one of the CoreGraphics routines via a
declare to make its (or a derivative of this Object2D) border dashed?
Speaks to the larger issue of how to massage RB's already rich vector
graphics suite with CoreGraphics, Quartz, OpenGL or whatever?
Thanks!
Peter
--
-------------------------------------------------------------------------------
Peter K. Stys, MD
Professor of Medicine(Neurology), Senior Scientist
Ottawa Health Research Institute, Div. of Neuroscience
Ottawa Hospital / University of Ottawa
Ontario, CANADA
tel: (613)761-5444
fax: (613)761-5330
http://www.ohri.ca/profiles/stys.asp
-------------------------------------------------------------------------------
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Date: Fri, 28 Apr 2006 11:23:37 -0600
From: joe at strout dot net
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Subject: Re: How do I draw a dashed border for an Object2D?
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Peter wrote:
But if I fill the mask with a zebra pattern, draw the the borders into
this mask, then if I draw this picture into the final graphics
context, that will change my entire underlying image (atop which I
want to draw just a dashed outline) into a zebra, no?
Yes. What, you want XOR mode too? :) That's another thing that doesn't work
well cross-platform (and isn't supported by Quartz at all, nor did it ever work
well on, say, a gray image.)
I do realize that marching ants is passé. Is there another way, eg.
passing an RB Object2D to one of the CoreGraphics routines via a
declare to make its (or a derivative of this Object2D) border dashed?
No, not that I can think of. An Object2D isn't a CoreGraphics object, though
it may be rendered as one -- rather, it's a REAL Software invention, which is
internally exactly the same on all platforms. It doesn't get converted into
something platform-specific until rendering, but you have no way to hook into
or extend it at that point.
Best,
- Joe
--
Joe Strout -- joe at strout dot net
Available for custom REALbasic programming or instruction.
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