[winGRASS] libG11

[Malcolm Blue]

> -----Original Message-----
> From: Glynn Clements [mailto:glynn.clements at virgin.net]

> Mike Thomas wrote:
>
> > v.digit hangs after about five points and doesn't show the line
> between the
> > mouse cursor and the last digitised point at any stage - my
> guess is that
> > either "XGetImage()" or the event queueing code is at the heart of the
> > problem.
>
> It's the event code. v.digit doesn't use the R_panel_* functions
> (which are the only operations which use XGetImage()).
>
I checked out one possibility suggested by Glynn's list.
libes/display/popup.c uses the R_panel_* functions, so I checked to see if
v.digit uses this.  It doesn't appear to I it doesn't directly anyway).
However, d.zoom, d.display, d.pan, d.rast.edit and a few others do.  (This
may be why I had problems with d.zoom).  We should get XGetImage() working
for these to work.

It probably is the event queue, but to find out why it is failing we should
see what it is doing differently.  The code in event.c was pretty slack (as
indicated in the comments by the author) and had no real error checking.  If
there isn't any already we should add checks for the queue filling up, etc.

Malcolm
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