void ComputeThread()
{
//Console.WriteLine("Start COMPUTE");
while (true)
{
ewh.WaitOne();
while (true)
{
if (computeExit)
{
return;
}
double mindist = double.MaxValue;
double maxdist = 0;
StarGrid selmin = null;
StarGrid selmax = null;
foreach (StarGrid gcheck in grids)
{
if (gcheck.Id >= 0 && !gcheck.Working) // if not a special grid
{
double dist = gcheck.DistanceFrom(curx, curz);
if (Math.Abs(dist - gcheck.CalculatedDistance) > MinRecalcDistance) // if its too small a change, ignore.. histerisis
{
int percentage = GetPercentage(dist);
if (percentage > gcheck.Percentage) // if increase, it has priority..
{
if (dist < mindist) // if best.. pick
{
mindist = dist;
selmin = gcheck;
//Console.WriteLine("Select {0} incr perc {1} to {2} dist {3,8:0.0}", gcheck.Id, gcheck.Percentage, percentage, dist);
}
}
else if (selmin == null && percentage < gcheck.Percentage) // if not selected a min one, pick the further one to decrease
{
if (dist > maxdist)
{
maxdist = dist;
selmax = gcheck;
//Console.WriteLine("Select {0} decr perc {1} to {2} dist {3,8:0.0}", gcheck.Id, gcheck.Percentage, percentage, dist);
}
}
}
}
}
if (selmin == null)
{
selmin = selmax;
}
if (selmin != null)
{
selmin.Working = true; // stops another go by this thread, only cleared by UI when it has displayed
int prevpercent = selmin.Percentage;
double prevdist = selmin.CalculatedDistance;
selmin.CalculatedDistance = selmin.DistanceFrom(curx, curz);
selmin.Percentage = GetPercentage(selmin.CalculatedDistance);
selmin.FillFromDB();
Thread.MemoryBarrier(); // finish above before trying to trigger another go..
Debug.Assert(Math.Abs(prevdist - selmin.CalculatedDistance) > MinRecalcDistance);
Debug.Assert(!computed.Contains(selmin));
//Console.WriteLine("Grid repaint {0} {1}%->{2}% dist {3,8:0.0}->{4,8:0.0} s{5}", selmin.Id, prevpercent, selmin.Percentage, prevdist, selmin.CalculatedDistance, selmin.CountJustMade);
computed.Add(selmin);
}
else
{
break; // nothing to do, wait for kick
}
}
}
}
