private void FindNearestPixelInRing(Point2 coor, ref int nearestPixel, out int previous)
{
var wasNearestPixel = nearestPixel;
if (ColorsManager.FindNearest(
coor.X,
P => Pixels[P].X,
false,
PrecisionGrad,
nearestPixel + HealpixManager.PixelsCountInRing(Pixels[nearestPixel].Ring),
ref nearestPixel)) // todo add approximation
{
previous = nearestPixel;
}
else
{
previous = nearestPixel - 1;
if (nearestPixel == Pixels.Length || Pixels[nearestPixel].PixelInRing == 1 /*next ring*/)
{
var pixelsInRing = HealpixManager.PixelsCountInRing(Pixels[wasNearestPixel].Ring);
if (wasNearestPixel == nearestPixel)
{
previous += pixelsInRing;
}
else
{
nearestPixel -= pixelsInRing;
}
}
}
}