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From: rick@Jessica.stanford.edu (Rick Wong)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Graying out a PICT
Message-ID: <3551@portia.Stanford.EDU>
Date: 12 Jul 89 23:05:26 GMT
References: <5982@hubcap.clemson.edu>
Sender: USENET News System <news@Portia.stanford.edu>
Reply-To: rick@Jessica.Stanford.EDU (Rick Wong)
Organization: Stanford University
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In article <5982@hubcap.clemson.edu> mikeoro@hubcap.clemson.edu (Michael K O'Rourke) writes:
>How can one go about drawing a PICT resource grayed out?  I tried setting the
>penpattern to gray and calling drawpicture, but this doesn't work. Has anyone
>done this before?  I have a PICT button and i need to have some way of graying
>it out when the button is inactive.
>
>Michael O'Rourke


Because the penpats/penmodes/etc. are saved with the picture definition,
setting them before calling DrawPicture has no effect.  An easy way to
achieve the desired effect is to gray out the image AFTER drawing it,
by using the patBic penmode.  For example:

void
DrawGrayedPict(PicHandle ph)
{
Rect	r = (**ph).picFrame;

	DrawPicture(ph, &r);

	/* Here we go . . . */
	PenMode(patBic);
	PenPat(gray);
	PaintRect(&r);
}

This, by the way, is the same technique used to draw grayed-out text
in menu items, buttons, and so forth.

Rick Wong
Stanford University, Courseware Authoring Tools Project
rick@jessica.stanford.edu