public override bool Equals(object obj)
{
if (obj is PrimitivePair <S, T> )
{
PrimitivePair <S, T> other = obj as PrimitivePair <S, T>;
return(first.Equals(other.first) && second.Equals(other.second));
}
else
{
return(false);
}
}
virtual public List <PrimitiveTriple <float, float, float> > Generate(GridMath gridMath, Random rand)
{
// List to return
List <PrimitiveTriple <float, float, float> > posList = new List <PrimitiveTriple <float, float, float> >();
// First determine the # of units
int numUnits = (int)Math.Ceiling(numMean);
if (numStdDev > 0)
{
numUnits = (int)Math.Round(RandN(numMean, numStdDev, (float)numMin, (float)numMax, rand));
}
// For each unit
PrimitivePair <float, float> tempPos = new PrimitivePair <float, float>(0, 0);
PrimitivePair <float, float> anchor;
PrimitivePair <int, int> tempGrid;
bool laydownFound;
for (int i = 0; i < numUnits; i++)
{
// Laydown not valid by default
laydownFound = false;
// Randomly pick an anchor (all anchors already in world coordinates)
anchor = anchors[rand.Next(0, anchors.Count)]; // Note: rand.Next max value is exclusive
// Keep trying points until we find one that satisfies grid constraints
while (!laydownFound)
{
// Now independently pick X and Z deviations from that point
tempPos.first = anchor.first + RandN(0.0f, fromAnchorStdDev_km, 0.0f, fromAnchorMax_km, rand);
tempPos.second = anchor.second + RandN(0.0f, fromAnchorStdDev_km, 0.0f, fromAnchorMax_km, rand);
// Convert that temp position to grid
tempGrid = gridMath.WorldToGrid(tempPos);
// Check to see if the grid is within allowed
if (allowedCells.Contains(tempGrid))
{
laydownFound = true;
}
}
// Save the 3D point
posList.Add(new PrimitiveTriple <float, float, float>(tempPos.first, 0, tempPos.second));
}
// Return list of randomized positions
return(posList);
}
// Transforms a hex cell center (u,v) in grid coordinates to a point (x,z) in world coordinates
// Based on reference: http://www.redblobgames.com/grids/hexagons/#hex-to-pixel
public PrimitivePair <float, float> GridToWorld(PrimitivePair <int, int> gridCoordinate)
{
// Extract inputs
int grid_u = gridCoordinate.first;
int grid_v = gridCoordinate.second;
// World x-coordinate
float world_x = gridToWorldScale * (uHat_x * ((float)grid_u) + vHat_x * ((float)grid_v)) + gridOrigin_x;
// World z-coordinate
float world_z = gridToWorldScale * (uHat_z * ((float)grid_u) + vHat_z * ((float)grid_v)) + gridOrigin_z;
// Package and return to caller
return(new PrimitivePair <float, float>(world_x, world_z));
}
// Transforms a point (x,z) in world coordinates to the (u,v) of the hex cell that contains it
// Based on references: http://www.redblobgames.com/grids/hexagons/#pixel-to-hex
// http://www.redblobgames.com/grids/hexagons/#rounding
public PrimitivePair <int, int> WorldToGrid(PrimitivePair <float, float> worldCoordinate)
{
// Extract inputs
float world_x = worldCoordinate.first;
float world_z = worldCoordinate.second;
// Compute determinant of transform matrix for inverse
float det = uHat_x * vHat_z - vHat_x * uHat_z;
// Compute offsets from grid origin
float rel_x = world_x - gridOrigin_x;
float rel_z = world_z - gridOrigin_z;
// Cube u-coordinate
float cube_u = (vHat_z * rel_x - vHat_x * rel_z) / (gridToWorldScale * det);
// Cube v-coordinate
float cube_v = (-uHat_z * rel_x + uHat_x * rel_z) / (gridToWorldScale * det);
// Cube w-coordinate
float cube_w = -cube_u - cube_v;
// Round cube coordinates to nearest integer
float round_u = (float)Math.Round(cube_u);
float round_v = (float)Math.Round(cube_v);
float round_w = (float)Math.Round(cube_w);
// Compute residual magnitudes
float diff_u = Math.Abs(round_u - cube_u);
float diff_v = Math.Abs(round_v - cube_v);
float diff_w = Math.Abs(round_w - cube_w);
// Snap to nearest hex center
if (diff_u > diff_v && diff_u > diff_w)
{
round_u = -round_v - round_w;
}
else if (diff_v > diff_w)
{
round_v = -round_u - round_w;
}
// Cast to int to return to caller
return(new PrimitivePair <int, int>((int)round_u, (int)round_v));
}
