GenerateAllTrianglesZot(int[] id)
{
var oct = id[0];
ZotCoordinate p0;
ZotCoordinate east;
ZotCoordinate west;
if (oct <= 4)
{
p0 = new ZotCoordinate(0, 0, false);
east = WgsToQtm.EastMostPointFor(oct);
west = WgsToQtm.WestMostPointFor(oct);
}
else
{
p0 = new ZotCoordinate(0, 0, true);
east = WgsToQtm.EastMostPointFor(oct - 4).SetHemisphere(true);
west = WgsToQtm.WestMostPointFor(oct - 4).SetHemisphere(true);
}
bool inverted = false;
var triangles = new List <(ZotCoordinate, ZotCoordinate, ZotCoordinate)>
{
(p0, east, west)
};
for (var i = 1; i < id.Length; i++)
{
var q = id[i];
if (inverted)
{
if (q == 1)
{
q = 2;
}
else if (q == 2)
{
q = 1;
}
}
if (q == 0)
{
inverted = !inverted;
}
GenerateTriangleQuadrant(q, p0, west, east,
out p0, out west, out east);
triangles.Add((p0, east, west));
}
return(triangles);
}
private static void GenerateTriangleQuadrant(int quadrant,
ZotCoordinate perpendicularPoint, ZotCoordinate westMost, ZotCoordinate eastMost,
out ZotCoordinate subPerpendicular, out ZotCoordinate subWestMost, out ZotCoordinate subEastMost
)
{
switch (quadrant)
{
case 0:
// Pole inversion
subPerpendicular = CoordinateExtensions.InBetween(eastMost, westMost);
subEastMost = CoordinateExtensions.InBetween(westMost, perpendicularPoint);
subWestMost = CoordinateExtensions.InBetween(eastMost, perpendicularPoint);
break;
case 2:
subPerpendicular = CoordinateExtensions.InBetween(eastMost, perpendicularPoint);
subEastMost = eastMost;
subWestMost = CoordinateExtensions.InBetween(eastMost, westMost);
break;
case 1:
subPerpendicular = CoordinateExtensions.InBetween(westMost, perpendicularPoint);
subEastMost = CoordinateExtensions.InBetween(westMost, eastMost);
subWestMost = westMost;
break;
case 3:
subPerpendicular = perpendicularPoint;
subWestMost = CoordinateExtensions.InBetween(perpendicularPoint, westMost);
subEastMost = CoordinateExtensions.InBetween(eastMost, perpendicularPoint);
break;
default:
throw new ArgumentException("Invalid quadrant: " + quadrant);
}
}
