public bool Update(double xp, double zp, float zoom, GLControl gl) // Foreground UI thread, tells it if anything has changed..
{
Debug.Assert(Application.MessageLoop);
StarGrid grd = null;
bool displayed = false;
while (computed.TryTake(out grd)) // remove from the computed queue and mark done
{
grd.Display(gl); // swap to using this one..
Thread.MemoryBarrier(); // finish above before clearing working
grd.Working = false;
displayed = true;
}
Thread.MemoryBarrier(); // finish above
curx = xp;
curz = zp;
ewh.Set(); // tick thread again to consider..
return(displayed); // return if we updated anything..
}
public bool IsDisplayed(double xp, double zp)
{
int gridid = GridId.Id(xp, zp);
StarGrid grid = grids.Find(x => x.Id == gridid);
if (grid != null)
{
return(grid.Displayed);
}
else
{
return(false);
}
}
public void Initialise()
{
for (int z = 0; z < GridId.gridzrange; z++)
{
for (int x = 0; x < GridId.gridxrange; x++)
{
int id = GridId.IdFromComponents(x, z);
double xp = 0, zp = 0;
bool ok = GridId.XZ(id, out xp, out zp);
Debug.Assert(ok);
StarGrid grd = new StarGrid(id, xp, zp, Color.Transparent, 1.0F); //A=0 means use default colour array
if (xp == 0 && zp == 0) // sol grid, unpopulated stars please
{
grd.dBAsk = SystemClass.SystemAskType.UnPopulatedStars;
}
grids.Add(grd);
}
}
visitedsystemsgrid = new StarGrid(-1, 0, 0, Color.Orange, 1.0F); // grid ID -1 means it won't be filled by the Update task
grids.Add(visitedsystemsgrid);
int solid = GridId.Id(0, 0);
populatedgrid = new StarGrid(solid, 0, 0, Color.Transparent, 1.0F); // Duplicate grid id but asking for populated stars
populatedgrid.dBAsk = SystemClass.SystemAskType.PopulatedStars;
grids.Add(populatedgrid); // add last, so displayed last, so overwrites anything else
long total = SystemClass.GetTotalSystems();
total = Math.Min(total, 10000000); // scaling limit at 10mil
long offset = (total - 1000000) / 100000; // scale down slowly.. experimental!
midpercentage -= (int)(offset / 2);
farpercentage -= (int)(offset / 3);
//midpercentage = 10; // agressive debugging options
//farpercentage = 1;
Console.WriteLine("Grids " + grids.Count + "Database Stars " + total + " mid " + midpercentage + " far " + farpercentage);
}
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
}
}
}
}
