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Order results from FindTilesInCircle by distance

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This commit is contained in:
Chris Forbes
2012-10-09 10:08:58 +13:00
parent 6e237b53e1
commit 699838332d
1 changed files with 29 additions and 6 deletions
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35
OpenRA.Game/WorldUtils.cs
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@@ -58,14 +58,37 @@ namespace OpenRA
public static IEnumerable<CPos> FindTilesInCircle(this World world, CPos a, int r)
{
var min = world.ClampToWorld(a - new CVec(r, r));
var max = world.ClampToWorld(a + new CVec(r, r));
for (var j = min.Y; j <= max.Y; j++)
for (var i = min.X; i <= max.X; i++)
if (r * r >= (new CPos(i, j) - a).LengthSquared)
yield return new CPos(i, j);
if (r > TilesByDistance.Length)
throw new InvalidOperationException("FindTilesInCircle supports queries for only <= {0}".F(MaxRange));
for(var i = 0; i < r; i++)
{
foreach(var offset in TilesByDistance[i])
{
var t = offset + a;
if (world.Map.Bounds.Contains(t.X, t.Y))
yield return t;
}
}
}
static List<CVec>[] InitTilesByDistance(int max)
{
var ts = new List<CVec>[max+1];
for (var i = 0; i < max+1; i++)
ts[i] = new List<CVec>();
for (var j = -max; j <= max; j++)
for (var i = -max; i <= max; i++)
if (max * max >= i * i + j * j)
ts[(int)Math.Ceiling(Math.Sqrt(i*i + j*j))].Add(new CVec(i,j));
return ts;
}
const int MaxRange = 50;
static List<CVec>[] TilesByDistance = InitTilesByDistance(MaxRange);
public static string GetTerrainType(this World world, CPos cell)
{
var custom = world.Map.CustomTerrain[cell.X, cell.Y];