public override IEnumerable<TileIndex> GetTilesForRegion(DataRect region, double level)
{
region.Intersect(rect);
//region.Intersect(new Rect(region.XMin, minY, region.Width, maxY - minY));
if (region.IsEmpty)
yield break;
checked
{
double tileWidth = TileWidth;
double tileHeight = TileHeight;
int minIx = (int)Math.Floor(region.XMin / tileWidth);
int maxIx = (int)Math.Ceiling(region.XMax / tileWidth);
int minIy = (int)Math.Floor(region.YMin / tileHeight);
int maxIy = (int)Math.Ceiling(region.YMax / tileHeight);
var maxSideCount = GetSideTilesCount(Level);
int maxIndex = maxSideCount / 2;
if (maxIx > maxIndex)
maxIx = maxIndex;
if (maxIy > maxIndex)
maxIy = maxIndex;
if (minIx < -maxIndex)
minIx = -maxIndex;
if (minIy < -maxIndex)
minIy = -maxIndex;
if (level != 0)
{
maxIx--;
maxIy--;
}
for (int ix = minIx; ix <= maxIx; ix++)
{
for (int iy = minIy; iy <= maxIy; iy++)
{
yield return new TileIndex(ix, iy, level);
}
}
}
}
public IEnumerable<TileIndex> GetTiles(DataRect region)
{
region = region.Intersect(rect);
if (region.IsEmpty)
return Enumerable.Empty<TileIndex>();
checked
{
double tileWidth = TileWidth;
double tileHeight = TileHeight;
int minTileX = (int)Math.Floor((region.XMin - minX) / tileWidth);
int minTileY = (int)Math.Floor((region.YMin - minY) / tileHeight);
double realX = minX + minTileX * tileWidth;
double realY = minY + minTileY * tileHeight;
int xNum = (int)Math.Ceiling((region.XMax - realX) / tileWidth);
int yNum = (int)Math.Ceiling((region.YMax - realY) / tileHeight);
int maxTileX = minTileX + xNum;
int maxTileY = minTileY + yNum;
List<TileIndex> res = new List<TileIndex>(xNum * yNum);
for (int x = minTileX; x < maxTileX; x++)
{
for (int y = minTileY; y < maxTileY; y++)
{
res.Add(new TileIndex(x, y, level));
}
}
return res;
}
}