Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uwm.edu!ogicse!milton!wjs
From: wjs@milton.u.washington.edu (William Jon Shipley)
Newsgroups: comp.sys.next
Subject: Re: Picking an arbitrary shape
Summary: infill, dude.
Message-ID: <18529@milton.u.washington.edu>
Date: 16 Mar 91 09:04:02 GMT
References: <1991Mar16.045903.5234@cs.ubc.ca>
Organization: University of Washington, Seattle
Lines: 23

Stuart Ritchie writes:
>[has some postscript shapes]
>I'd like to find out which shape receives a mouse up or down
>event.
>
>Is there a way to check whether a mouse event occurs inside of
>an arbitrary bounding path (bounding _box_ works for rectangles,
>but not circles or arcs or Bart Simpson's.)

Yup.  Check out infill and instroke to check if your point is in an ordinary
path and inufill and inustroke to see if your point is in user path.

From the manuals (Summaries/04_OpSummary/_WindowSystemSupportOps.rtf):

x y		infill    bool
userpath	infill    bool		return true if pixel at (x, y) (or
	  				any pixels in userpath) would be
					painted by fill of current path

Cool stuff.  Only works for DPS (and probably PSL2).

-william shipley
glenn reid wannabe