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From: mouse@LIGHTNING.MCRCIM.MCGILL.EDU
Newsgroups: comp.windows.x
Subject: Re: a couple o' questions
Message-ID: <9012190128.AA24722@lightning.McRCIM.McGill.EDU>
Date: 19 Dec 90 01:28:16 GMT
Sender: daemon@athena.mit.edu (Mr Background)
Organization: The Internet
Lines: 45

>>    gc = XCreateGC(XtDisplay(w),XtWindow(w),None,NULL); /* defaults */
> This uses the Default GC settings which are unpredictable.

Not at all - only the font is in any sense unpredictable, unless the
implementation is seriously buggy.  From the Xlib document:

	The default GC values are:
	
	_________________________________________________________________________________
	Component            Default
	_________________________________________________________________________________
	function             GXcopy
	plane_mask           All ones
	foreground           0
	background           1
	line_width           0
	line_style           LineSolid
	cap_style            CapButt
	join_style           JoinMiter
	fill_style           FillSolid
	fill_rule            EvenOddRule
	arc_mode             ArcPieSlice
	tile                 Pixmap of unspecified size filled with foreground pixel
	                     (that is, client specified pixel if any, else 0)
	                     (subsequent changes to foreground do not affect this pixmap)
	stipple              Pixmap of unspecified size filled with ones
	ts_x_origin          0
	ts_y_origin          0
	font                 <implementation dependent>
	subwindow_mode       ClipByChildren
	graphics_exposures   True
	clip_x_origin        0
	clip_y_origin        0
	clip_mask            None
	dash_offset          0
	dashes               4 (that is, the list [4, 4])
	_________________________________________________________________________________
	
	Note that foreground and background are not set to any
	values likely to be useful in a window.

					der Mouse

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