public Cell[][] ComputeMap(Cell[][] baseMap, Enemy[] enemies, List <List <Vector2> > cellsByEnemy)
{
Cell[][] im = new Cell[cellsX][];
for (int x = 0; x < cellsX; x++)
{
im [x] = new Cell[cellsZ];
for (int y = 0; y < cellsZ; y++)
{
im [x] [y] = baseMap [x] [y].Copy();
}
}
for (int i = 0; i < enemies.Length; i++)
{
Enemy enemy = enemies [i];
// For every enemy, get their direction and current world position and scale into IM scale
Vector2 dir = new Vector2(enemy.GetSimulatedForward().x, enemy.GetSimulatedForward().z);
// Convert enemy position into Grid Coordinates
Vector2 pos = new Vector2((enemy.GetSimulationPosition().x - minX) / tileSizeX, (enemy.GetSimulationPosition().z - minZ) / tileSizeZ);
Vector2 p = new Vector2();
for (int x = -1; x <= 1; x++)
{
for (int y = -1; y <= 1; y++)
{
// Check map boundaries
if (Mathf.FloorToInt(pos.x + x) >= 0 && Mathf.FloorToInt(pos.x + x) < cellsX && Mathf.FloorToInt(pos.y + y) >= 0 && Mathf.FloorToInt(pos.y + y) < cellsZ)
{
// (everything here is in world coord, so we must transform back from grid coord to world coord)
// If the distance from the position of the guy to the middle of the 4 cells around him is leseer than the radius, we paint those cells
if (Vector2.Distance(new Vector2(enemy.GetSimulationPosition().x, enemy.GetSimulationPosition().z), new Vector2((Mathf.Floor(pos.x + x) + tileSizeX) * tileSizeX + minX, (Mathf.Floor(pos.y + y) + tileSizeZ) * tileSizeZ + minZ)) < enemy.radius)
{
im [Mathf.FloorToInt(pos.x + x)] [Mathf.FloorToInt(pos.y + y)].seen = true;
cellsByEnemy [i].Add(new Vector2(pos.x + x, pos.y + y));
}
}
}
}
// if tileSizeX != tileSizeZ we can be in big trouble!
float dist = enemy.fovDistance / ((tileSizeX + tileSizeZ) / 2);
DDA dda = new DDA(tileSizeX, tileSizeZ, cellsX, cellsZ);
for (int x = 0; x < cellsX; x++)
{
for (int y = 0; y < cellsZ; y++)
{
// Skip cells that are staticly blocked or seen by other enemies
// Don't skip cells seen by other enemies or we won't have the correct seenCells computed
if (im [x] [y].blocked || im [x] [y].safe)
{
continue;
}
// This enemy haven't seen it yet
bool seen = false;
for (int px = 0; px <= 1; px++)
{
for (int py = 0; py <= 1; py++)
{
// Destination of the ray
p.Set(x + px, y + py);
// Direction of the ray
Vector2 res = (p - pos).normalized;
// Is the target within our FoV?
if (Vector2.Distance(p, pos) < dist && Vector2.Angle(res, dir) < enemy.fovAngle)
{
// Check if target is seen by this enemy
seen = seen || dda.HasLOS(im, p, pos, res, x, y);
}
}
}
// If this enemy has seen it
if (seen)
{
cellsByEnemy [i].Add(new Vector2(x, y));
}
// Now take into account other enemies before modifying the cells value
im [x] [y].seen = im [x] [y].seen || seen;
}
}
}
return(im);
}
