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Detect and recover from a math overflow that can possibly prevent panel text

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from updating if the instrument panel is not drawn for more then 35.7
minutes.
This commit is contained in:
curt 2002-04-19 14:05:58 +00:00
parent 473ea84621
commit b36f19b871
1 changed files with 23 additions and 1 deletions
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24
src/Cockpit/panel.cxx
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@ -1012,7 +1012,29 @@ FGTextLayer::draw ()
text_renderer.start3f(0, 0, 0);
_now.stamp();
if (_now - _then > 100000) {
long diff = _now - _then;
#if 0
// It would be nice to keep this #ifdef'd stuff for (04/18/2002 +
// a couple days) as I verify my solution to the panel text
// drawing problem is actually correct. -CLO
cout << "time diff = " << diff << endl;
if ( _now - _then < 0 ) {
cout << "Eeek, the past is now in the future!" << endl;
cout << "Now = " << _now.get_seconds() << " seconds "
<< _now.get_usec() << "usecs" << endl;
cout << "Past = " << _then.get_seconds() << " seconds "
<< _then.get_usec() << "usecs" << endl;
exit(-1);
}
#endif
if (diff > 100000 || diff < 0 ) {
// ( diff < 0 ) is a sanity check and indicates our time stamp
// difference math probably overflowed. We can handle a max
// difference of 35.8 minutes since the returned value is in
// usec. So if the panel is left off longer than that we can
// over flow the math with it is turned back on. This (diff <
// 0) catches that situation, get's us out of trouble, and
// back on track.
recalc_value();
_then = _now;
}