public static EdgePoint Decompress(short b)
{
var edgePoint = new EdgePoint();
var bitArray = new BitArray(BitConverter.GetBytes(b));
edgePoint.TopLeftCorner = bitArray.Get(0) ? 1 : bitArray.Get(4) ? 2 : 0;
edgePoint.TopRightCorner = bitArray.Get(1) ? 1 : bitArray.Get(5) ? 2 : 0;
edgePoint.BottomLeftCorner = bitArray.Get(2) ? 1 : bitArray.Get(6) ? 2 : 0;
edgePoint.BottomRightCorner = bitArray.Get(3) ? 1 : bitArray.Get(7) ? 2 : 0;
edgePoint.LowerTopLeftCorner = bitArray.Get(4) ? 1 : 0;
edgePoint.LowerTopRightCorner = bitArray.Get(5) ? 1 : 0;
edgePoint.LowerBottomLeftCorner = bitArray.Get(6) ? 1 : 0;
edgePoint.LowerBottomRightCorner = bitArray.Get(7) ? 1 : 0;
edgePoint.RenderAbove = bitArray.Get(8);
edgePoint.RenderBelow = bitArray.Get(9);
edgePoint.RenderNorth = bitArray.Get(10);
edgePoint.RenderSouth = bitArray.Get(11);
edgePoint.RenderEast = bitArray.Get(12);
edgePoint.RenderWest = bitArray.Get(13);
return edgePoint;
}
public EdgePoint CalculateEdgePoint(int edges)
{
var missingAbove = (edges & 0x00000001) != 0;
var missingBelow = (edges & 0x00000002) != 0;
var missingEast = (edges & 0x00000004) != 0;
var missingWest = (edges & 0x00000008) != 0;
var missingNorth = (edges & 0x00000010) != 0;
var missingSouth = (edges & 0x00000020) != 0;
var missingNorthEast = (edges & 0x00000040) != 0;
var missingNorthWest = (edges & 0x00000080) != 0;
var missingSouthEast = (edges & 0x00000100) != 0;
var missingSouthWest = (edges & 0x00000200) != 0;
var missingBelowEast = (edges & 0x00000400) != 0;
var missingBelowWest = (edges & 0x00000800) != 0;
var missingBelowNorth = (edges & 0x00001000) != 0;
var missingBelowSouth = (edges & 0x00002000) != 0;
var missingBelowNorthEast = (edges & 0x00004000) != 0;
var missingBelowNorthWest = (edges & 0x00008000) != 0;
var missingBelowSouthEast = (edges & 0x00010000) != 0;
var missingBelowSouthWest = (edges & 0x00020000) != 0;
var missingAboveAbove = (edges & 0x00040000) != 0;
var missingAboveEast = (edges & 0x00080000) != 0;
var missingAboveWest = (edges & 0x00100000) != 0;
var missingAboveNorth = (edges & 0x00200000) != 0;
var missingAboveSouth = (edges & 0x00400000) != 0;
var missingAboveNorthEast = (edges & 0x00800000) != 0;
var missingAboveNorthWest = (edges & 0x01000000) != 0;
var missingAboveSouthEast = (edges & 0x02000000) != 0;
var missingAboveSouthWest = (edges & 0x04000000) != 0;
var missingBelowBelowNorthEast = (edges & 0x08000000) != 0;
var missingBelowBelowNorthWest = (edges & 0x10000000) != 0;
var missingBelowBelowSouthEast = (edges & 0x20000000) != 0;
var missingBelowBelowSouthWest = (edges & 0x40000000) != 0;
var edgePoint = new EdgePoint();
if (missingAbove)
{
if (!(missingEast && missingWest))
{
if (missingEast && !missingBelowEast)
{
edgePoint.TopRightCorner = 1;
edgePoint.BottomRightCorner = 1;
}
if (missingWest && !missingBelowWest)
{
edgePoint.TopLeftCorner = 1;
edgePoint.BottomLeftCorner = 1;
}
}
if (!(missingNorth && missingSouth))
{
if (missingNorth && !missingBelowNorth)
{
edgePoint.TopLeftCorner = 1;
edgePoint.TopRightCorner = 1;
}
if (missingSouth && !missingBelowSouth)
{
edgePoint.BottomLeftCorner = 1;
edgePoint.BottomRightCorner = 1;
}
}
if (missingSouthEast && !missingNorthEast && !missingSouthWest && !missingBelowSouthEast)
{
edgePoint.BottomRightCorner = 1;
}
if (missingNorthEast && !missingSouthEast && !missingNorthWest && !missingBelowNorthEast)
{
edgePoint.TopRightCorner = 1;
}
if (missingSouthWest && !missingNorthWest && !missingSouthEast && !missingBelowSouthWest)
{
edgePoint.BottomLeftCorner = 1;
}
if (missingNorthWest && !missingSouthWest && !missingNorthEast && !missingBelowNorthWest)
{
edgePoint.TopLeftCorner = 1;
}
}
if (missingAbove && missingBelowSouthEast && !missingBelowBelowSouthEast && !missingBelowNorth
&& !missingBelowWest && !missingBelowNorthWest && !missingBelowNorthEast && !missingBelowSouth
&& !missingBelowEast && !missingBelowSouthWest && missingSouth && missingEast && missingSouthEast)
{
edgePoint.BottomRightCorner = 2;
edgePoint.LowerBottomRightCorner = 1;
}
if (missingAboveAbove && !missingAbove && !missingBelowSouthEast && missingSouthEast && !missingNorth
&& !missingWest && !missingNorthWest && !missingNorthEast && !missingSouth && !missingEast
&& !missingSouthWest && missingAboveSouth && missingAboveEast && missingAboveSouthEast)
{
edgePoint.BottomRightCorner = 1;
}
if (missingAbove && missingBelowSouthWest && !missingBelowBelowSouthWest && !missingBelowNorth
&& !missingBelowWest && !missingBelowNorthWest && !missingBelowNorthEast && !missingBelowSouth
&& !missingBelowEast && !missingBelowSouthEast && missingSouth && missingWest && missingSouthWest)
{
edgePoint.BottomLeftCorner = 2;
edgePoint.LowerBottomLeftCorner = 1;
}
if (missingAboveAbove && !missingAbove && !missingBelowSouthWest && missingSouthWest && !missingNorth
&& !missingWest && !missingNorthWest && !missingNorthEast && !missingSouth && !missingEast
&& !missingSouthEast && missingAboveSouth && missingAboveWest && missingAboveSouthWest)
{
edgePoint.BottomLeftCorner = 1;
}
if (missingAbove && missingBelowNorthEast && !missingBelowBelowNorthEast && !missingBelowNorth
&& !missingBelowWest && !missingBelowNorthWest && !missingBelowSouth && !missingBelowEast
&& !missingBelowSouthWest && !missingBelowSouthEast && missingNorth && missingEast && missingNorthEast)
{
edgePoint.TopRightCorner = 2;
edgePoint.LowerTopRightCorner = 1;
}
if (missingAboveAbove && !missingAbove && !missingBelowNorthEast && missingNorthEast && !missingNorth
&& !missingWest && !missingNorthWest && !missingSouth && !missingEast && !missingSouthWest
&& !missingSouthEast && missingAboveNorth && missingAboveEast && missingAboveNorthEast)
{
edgePoint.TopRightCorner = 1;
}
if (missingAbove && missingBelowNorthWest && !missingBelowBelowNorthWest && !missingBelowNorth
&& !missingBelowWest && !missingBelowNorthEast && !missingBelowSouth && !missingBelowEast
&& !missingBelowSouthEast && !missingBelowSouthWest && missingNorth && missingWest && missingNorthWest)
{
edgePoint.TopLeftCorner = 2;
edgePoint.LowerTopLeftCorner = 1;
}
if (missingAboveAbove && !missingAbove && !missingBelowNorthWest && missingNorthWest && !missingNorth
&& !missingWest && !missingNorthEast && !missingSouth && !missingEast && !missingSouthEast
&& !missingSouthWest && missingAboveNorth && missingAboveWest && missingAboveNorthWest)
{
edgePoint.TopLeftCorner = 1;
}
edgePoint.RenderAbove = missingAbove;
edgePoint.RenderBelow = missingBelow;
edgePoint.RenderWest = missingWest || missingNorthWest || missingSouthWest
|| (missingSouth && !missingAbove) || (missingNorth && !missingAbove);
edgePoint.RenderEast = missingEast || missingNorthEast || missingSouthEast
|| (missingSouth && !missingAbove) || (missingNorth && !missingAbove);
edgePoint.RenderNorth = missingNorth || missingNorthEast || missingNorthWest
|| (missingEast && !missingAbove) || (missingWest && !missingAbove);
edgePoint.RenderSouth = missingSouth || missingSouthEast || missingSouthWest
|| (missingEast && !missingAbove) || (missingWest && !missingAbove);
return edgePoint;
}