private unsafe static void ProcessLines(
ISimulationGrid grid,
SimulationPoint[] body,
ref RectLRTB physinfo,
ref int activetriggers,
LinkedList <int> collisions = null)
{
int bodylen = body.Length;
for (int i = 0; i < bodylen; i++)
{
var startpos = body[i].Location;
var cellx = (int)Math.Floor(startpos.X / 14);
var celly = (int)Math.Floor(startpos.Y / 14);
//every itreration is at least 3x3, so asjust the info for that
physinfo.left = Math.Min(cellx - 1, physinfo.left);
physinfo.top = Math.Min(celly - 1, physinfo.top);
physinfo.right = Math.Max(cellx + 1, physinfo.right);
physinfo.bottom = Math.Max(celly + 1, physinfo.bottom);
for (var x = -1; x <= 1; x++)
{
for (var y = -1; y <= 1; y++)
{
var cell = grid.GetCell(cellx + x, celly + y);
if (cell == null)
{
continue;
}
foreach (var line in cell)
{
if (line.Interact(ref body[i]))
{
collisions?.AddLast(line.ID);
if (line.Trigger != null)
{
if (activetriggers != line.ID)
{
activetriggers = line.ID;
}
}
}
}
}
}
}
}