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Cursor problems, MAC and PC [message #30698]

Thu, 09 May 2002 08:03

Ted Cary
Messages: 53
Registered: October 2001

Member

I have been porting some of my lab's IDL 5.4 Macintosh programs to a Windows
2000 PC running 5.5. Programs that change the cursor image have been having
problems, both in direct graphics and object graphics.

1.) On the Mac, just setting the cursor without setting a mask appears to
cause the cursor image to be XOR-ed with the window contents, so it is
always visible against the background. On the PC, unmasked custom cursors
disappear against black backgrounds, as described in the online help, but
the standard cursors set with the CURSOR_STANDARD keyword to DEVICE do
exhibit the XOR-like behavior. Can the XOR behavior be achieved with custom
cursors on a Windows machine?

2.) In Windows, calls to DEVICE with the CURSOR_IMAGE keyword cause a new
direct graphics window to pop up if one is not already open. This did not
happen in the Mac programs. Is there a way to turn this off?

3.) In Macintosh object graphics windows, setting the cursor with
IDLgrWindow::SetCurrentCursor causes some problems. While dragging the
mouse across the viewport, the cursor constantly cycles between the object
window cursor and the direct graphics cursor. This was easily solved by
setting the direct graphics cursor to the same thing as the object window
cursor. On Windows this cursor cycling does not occur; instead new direct
graphics windows keep popping up whenever the cursor is changed (see #2).

I can fix these problems in Windows by drawing and setting masks for each
cursor and taking out all the extra calls to DEVICE, but I was hoping for a
less time consuming, cross-platform solution. The Macintosh object
graphics cursor cycling is particularly troublesome, although the workaround
is simple enough. Is this a known bug or a common programming mistake? Has
anyone experienced or solved any of these problems?

Thanks for any help,

Ted Cary

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[Message index]

		Cursor problems, MAC and PC By: Ted Cary on Thu, 09 May 2002 08:03
		Re: CURSOR problems By: David Fanning on Mon, 22 August 2005 18:24
		Re: CURSOR problems By: Ken Mankoff on Mon, 22 August 2005 18:01
		Re: CURSOR problems By: K. Bowman on Tue, 23 August 2005 07:09
		Re: CURSOR problems By: Ken Mankoff on Mon, 22 August 2005 17:00
		Re: CURSOR problems By: David Fanning on Mon, 22 August 2005 18:25
		Re: CURSOR problems By: Richard French on Mon, 22 August 2005 17:04
		Re: CURSOR problems By: Patrick Broos on Tue, 23 August 2005 05:39
		Re: CURSOR problems By: K. Bowman on Mon, 22 August 2005 14:55
		Re: CURSOR problems By: David Fanning on Mon, 22 August 2005 14:03
		Re: CURSOR problems By: Ken Mankoff on Mon, 22 August 2005 13:47
		Re: CURSOR problems By: K. Bowman on Mon, 22 August 2005 12:50
		Re: CURSOR problems By: Timm Weitkamp on Mon, 22 August 2005 10:00
		Re: CURSOR problems By: David Fanning on Mon, 22 August 2005 09:58
		Re: CURSOR problems By: R.G. Stockwell on Mon, 22 August 2005 09:30

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