/// <summary>
/// Determine all tiles on screen based on the given viewport
/// </summary>
/// <param name="viewportWidth">Viewport width in pixel</param>
/// <param name="viewportHeight">Viewport height in pixel</param>
/// <returns>Returns a flatten byte array which represants the tiles</returns>
public Tile[] GetTileMapInScreen(int viewportWidth, int viewportHeight)
{
ScreenWidth = viewportWidth;
ScreenHeight = viewportHeight;
int screenColumnCount = (viewportWidth / tileSize);
int screenRowCount = (viewportHeight / tileSize);
Tile[] tilesInScreen = new Tile[screenRowCount * screenColumnCount];
int posRow = tileRow + (screenRowCount / 2);
int negRow = tileRow - (screenRowCount / 2);
int posColumn = tileColumn + (screenColumnCount / 2);
int negColumn = tileColumn - (screenColumnCount / 2);
int rowIndex = 0;
for (int r = negRow; r < posRow; r++)
{
int columnIndex = 0;
for (int c = negColumn; c < posColumn; c++)
{
int newMapIndex = CurrentMapIndex;
int realRow = r;
int realColumn = c;
if (TileMathHelper.IsOutOfRange(r, c, TileRowCount, TileColumnCount))
{
newMapIndex = TileMathHelper.GetMapIndex(r, c, TileRowCount, TileColumnCount, newMapIndex);
realRow = TileMathHelper.FixTileIndex(r, TileRowCount);
realColumn = TileMathHelper.FixTileIndex(c, TileColumnCount);
}
//GetValues and merge
if (newMapIndex < 0)
{
tilesInScreen[TileMathHelper.ToIndex(rowIndex, columnIndex++, screenColumnCount)] = new Tile(ushort.MaxValue, 255);
int newGridRow = (int)Math.Floor((double)r / (double)TileRowCount);
int newGridColumn = (int)Math.Floor((double)c / (double)TileColumnCount);
GridGenerationIsSlow?.Invoke(this, new GridEventArgs(newGridRow, newGridColumn, GridRow, GridColumn, false));
}
else
{
tilesInScreen[TileMathHelper.ToIndex(rowIndex, columnIndex++, screenColumnCount)] = maps[newMapIndex].MapSurface[TileMathHelper.ToIndex(realRow, realColumn, TileColumnCount)];
}
}
rowIndex++;
}
return(tilesInScreen);
}
/// <summary>
/// Create a circular area to a given map
/// </summary>
/// <param name="mapIndex">Index of the map</param>
/// <param name="maps">Current grids</param>
/// <param name="edgeOverrides">Current edge override maps</param>
/// <param name="rowIndex">Tile row index</param>
/// <param name="columnIndex">Tile column index</param>
/// <param name="rowCount">Number of rows per grid</param>
/// <param name="columnCount">Number of columns per grid</param>
/// <param name="radius">Radius of the circle</param>
/// <param name="tileSize">Size of a tile in pixel</param>
/// <param name="metersPerTile">Size of a tile in meter</param>
/// <param name="tileIdValue">Tile id value for the circular area</param>
/// <param name="tileFlags">Tile flags</param>
/// <param name="allowEdgeOverflow">Allows areas to overlap tiles from other maps</param>
/// <param name="useEdgeNoise">Adds edge noise to the generated area</param>
/// <returns>Returns the number of changed tiles</returns>
private int CreateCircleArea(int mapIndex, Tile[][] maps, Tile[][] edgeOverrides, int rowIndex, int columnIndex, int rowCount, int columnCount, int radius, int tileSize, float metersPerTile, ushort tileIdValue, byte tileFlags, bool allowEdgeOverflow, bool useEdgeNoise)
{
int modified = 0;
int minRadiusTile = (int)Math.Ceiling(radius / metersPerTile);
int minRadiusPx = minRadiusTile * tileSize;
int x = columnIndex * tileSize;
int y = rowIndex * tileSize;
for (int r = rowIndex - minRadiusTile; r < rowIndex + minRadiusTile; r++)
{
for (int c = columnIndex - minRadiusTile; c < columnIndex + minRadiusTile; c++)
{
int currentMapIndex = mapIndex;
int realRow = r;
int realColumn = c;
if (TileMathHelper.IsOutOfRange(r, c, rowCount, columnCount))
{
if (allowEdgeOverflow)
{
currentMapIndex = TileMathHelper.GetMapIndex(r, c, rowCount, columnCount, currentMapIndex);
if (currentMapIndex >= 0)
{
realRow = TileMathHelper.FixTileIndex(r, rowCount);
realColumn = TileMathHelper.FixTileIndex(c, columnCount);
}
else
{
continue;
}
}
else
{
continue;
}
}
int distance = TileMathHelper.GetDistance(x, y, c * tileSize, r * tileSize);
if (distance <= minRadiusPx)
{
int id = TileMathHelper.ToIndex(realRow, realColumn, columnCount);
if (mapIndex == currentMapIndex)
{
if (maps[currentMapIndex][id].Id == 0)
{
maps[currentMapIndex][id] = new Tile(tileIdValue, tileFlags);
modified++;
}
}
else
{
if (edgeOverrides[currentMapIndex][id].Id == 0)
{
edgeOverrides[currentMapIndex][id] = new Tile(tileIdValue, tileFlags);
}
}
}
}
}
return(modified);
}