public static IEnumerable <TileInfo> GetTilesInView(ITileSchema schema, Extent extent, string levelId)
{
var range = TileTransform.WorldToTile(extent, levelId, schema);
for (var x = range.FirstCol; x < range.FirstCol + range.ColCount; x++)
{
for (var y = range.FirstRow; y < range.FirstRow + range.RowCount; y++)
{
if (x < 0 || x >= schema.GetMatrixWidth(levelId))
{
continue;
}
if (y < 0 || y >= schema.GetMatrixHeight(levelId))
{
continue;
}
var info = new TileInfo
{
Extent = TileTransform.TileToWorld(new TileRange(x, y), levelId, schema),
Index = new TileIndex(x, y, levelId)
};
yield return(info);
}
}
}
public IEnumerable <TileInfo> GetTilesInView(Extent extent, int level)
{
TileRange range = TileTransform.WorldToTile(extent, level, this);
for (int x = range.FirstCol; x < range.FirstCol + range.ColCount; x++)
{
for (int y = range.FirstRow; y < range.FirstRow + range.RowCount; y++)
{
var info = new TileInfo
{
Extent = TileTransform.TileToWorld(new TileRange(x, y), level, this),
Index = new TileIndex(x, y, level)
};
if (WithinSchemaExtent(Extent, info.Extent))
{
yield return(info);
}
}
}
}
internal static IEnumerable <TileInfo> GetTileInfos(ITileSchema schema, Extent extent, string levelId)
{
// todo: move this method elsewhere.
var range = TileTransform.WorldToTile(extent, levelId, schema);
// todo: use a method to get tilerange for full schema and intersect with requested tilerange.
var startX = Math.Max(range.FirstCol, schema.GetMatrixFirstCol(levelId));
var stopX = Math.Min(range.FirstCol + range.ColCount, schema.GetMatrixFirstCol(levelId) + schema.GetMatrixWidth(levelId));
var startY = Math.Max(range.FirstRow, schema.GetMatrixFirstRow(levelId));
var stopY = Math.Min(range.FirstRow + range.RowCount, schema.GetMatrixFirstRow(levelId) + schema.GetMatrixHeight(levelId));
for (var x = startX; x < stopX; x++)
{
for (var y = startY; y < stopY; y++)
{
yield return(new TileInfo
{
Extent = TileTransform.TileToWorld(new TileRange(x, y), levelId, schema),
Index = new TileIndex(x, y, levelId)
});
}
}
}
public static Extent GetExtentOfTilesInView(ITileSchema schema, Extent extent, string levelId)
{
var range = TileTransform.WorldToTile(extent, levelId, schema);
return(TileTransform.TileToWorld(range, levelId, schema));
}
public Extent GetExtentOfTilesInView(Extent extent, int level)
{
TileRange range = TileTransform.WorldToTile(extent, level, this);
return(TileTransform.TileToWorld(range, level, this));
}
