/// <summary>
///
/// </summary>
/// <param name="cell"></param>
void UpdateProjection(CPos cell)
{
MPos uv;
if (Grid.MaximumTerrainHeight == 0)
{
uv = cell.ToMPos(Grid.Type);
cellProjection[cell] = new[] { (PPos)uv };
var inverse = inverseCellProjection[uv];
inverse.Clear();
inverse.Add(uv);
return;
}
if (!initializedCellProjection)
{
InitializeCellPojection();
}
uv = cell.ToMPos(Grid.Type);
// Remove old reverse projection
// 删除旧的反向投影
foreach (var puv in cellProjection[uv])
{
var temp = (MPos)puv;
inverseCellProjection[(MPos)puv].Remove(uv);
projectedHeight[temp] = ProjectedCellHeightInner(puv);
}
var projected = ProjectCellInner(uv);
cellProjection[uv] = projected;
foreach (var puv in projected)
{
var temp = (MPos)puv;
inverseCellProjection[temp].Add(uv);
var height = ProjectedCellHeightInner(puv);
projectedHeight[temp] = height;
// Propagate height up cliff faces
while (true)
{
temp = new MPos(temp.U, temp.V - 1);
if (!inverseCellProjection.Contains(temp) || inverseCellProjection[temp].Any())
{
break;
}
projectedHeight[temp] = height;
}
}
}
/// <summary>
/// 获取某一单元格所代表的地形索引
/// Transparently cache results of GetTerrainIndex in Map.
///
/// This method performs an expensive calculation and is called often during pathfinding.
/// We create a cache of the terrain indicies for the map to vastly reduce the cost.
/// </summary>
/// <param name="cell"></param>
/// <returns></returns>
public byte GetTerrainIndex(CPos cell)
{
const short InvalidCachedTerrainIndex = -1;
//Lazily initialize a cache for terrain indexes;懒初始化地形索引缓存
if (cachedTerrainIndexes == null)
{
cachedTerrainIndexes = new CellLayer <short>(this);
cachedTerrainIndexes.Clear(InvalidCachedTerrainIndex);
//Invalidate the entry for a cell if anything could cause the terrain index to change;
Action <CPos> invalidateTerrainIndex = c => cachedTerrainIndexes[c] = InvalidCachedTerrainIndex;
CustomTerrain.CellEntryChanged += invalidateTerrainIndex;
Tiles.CellEntryChanged += invalidateTerrainIndex;
}
var uv = cell.ToMPos(this);
var terrainIndex = cachedTerrainIndexes[uv];
//PERF:Cache terrain indexes per cell on demand.//按需求对每个单元格缓存地形索引
if (terrainIndex == InvalidCachedTerrainIndex)
{
var custom = CustomTerrain[uv];
terrainIndex = cachedTerrainIndexes[uv] = custom != byte.MaxValue ? custom : Rules.TileSet.GetTerrainIndex(Tiles[uv]);
}
return((byte)terrainIndex);
}
public bool Contains(CPos cell)
{
if (GridT == MapGridT.RectangularIsometric && cell.X < cell.Y)
{
return(false);
}
return(Contains(cell.ToMPos(GridT)));
}
public bool Contains(CPos cell)
{
//.ToMPos() returns the same result if the X and Y coordinates are switched.X<Y is invalid in the RectangularIsometric coordinate system.
//so we pre-filter these to avoid returning the wrong result.
if (Grid.Type == MapGridT.RectangularIsometric && cell.X < cell.Y)
{
return(false);
}
return(Contains(cell.ToMPos(this)));
}
public CPos Clamp(CPos cell)
{
return(Clamp(cell.ToMPos(this)).ToCPos(this));
}
/// <summary>
/// Resolve an array index from cell coordinates
/// </summary>
/// <param name="cell"></param>
/// <returns></returns>
int Index(CPos cell)
{
return(Index(cell.ToMPos(GridT)));
}