// Return all times from start to stop. Also return the indexes of the times at which the earth elevation reaches a minima
void GetLowEarthTimes(DateTime outer_start, DateTime outer_stop, out List <DateTime> all_times, out List <int> indices_of_minima_earth_elevation)
{
var center = new Point(Region.Left + Region.Width / 2, Region.Top + Region.Height / 2);
var centerPatch = ViperEnvironment.GetPatch(TerrainPatch.LineSampleToId(center));
centerPatch.FillMatrices(ViperEnvironment.Terrain);
// Generate the time / elevation pairs
all_times = new List <DateTime>();
for (var time = outer_start; time <= outer_stop; time += Step)
{
all_times.Add(time);
}
var earth_elevations = all_times.Select(t =>
{
centerPatch.GetAzEl(CSpice.EarthPosition(t), 0, 0, out float _, out float earth_elevation_rad);
return(earth_elevation_rad);
}).ToList();
// Find minima
indices_of_minima_earth_elevation = new List <int>();
for (var i = 1; i < earth_elevations.Count - 1; i++)
{
if (Start <= all_times[i] && all_times[i] <= Stop && earth_elevations[i - 1] > earth_elevations[i] && earth_elevations[i] < earth_elevations[i + 1])
{
indices_of_minima_earth_elevation.Add(i);
}
}
}
void LoadTiles()
{
var s = TerrainPatch.DefaultSize;
IdBounds = new Rectangle(Bounds.Left / s, Bounds.Top / s, Bounds.Width / s, Bounds.Height / s);
_patches = new List <TerrainPatch>();
for (var y = IdBounds.Top; y < IdBounds.Bottom; y++)
{
for (var x = IdBounds.Left; x < IdBounds.Right; x++)
{
var p = ViperEnvironment.GetPatch(new Point(x, y));
if (p != null)
{
_patches.Add(p);
}
}
}
Console.WriteLine($"{_patches.Count} patches were loaded");
foreach (var p in _patches)
{
Console.WriteLine(p.Id);
}
}