private static TileRect GetCornerRect(LevelCorner corner, int width, int height, int size)
{
int minX, maxX, minY, maxY;
if (corner.IsSouth())
{
minY = 0;
maxY = size - 1;
}
else
{
minY = height - size;
maxY = height - 1;
}
if (corner.IsEast())
{
minX = 0;
maxX = size - 1;
}
else
{
minX = width - size;
maxX = width - 1;
}
var rect = new TileRect(minX, minY, maxX, maxY);
rect.Clamp(width, height);
return(rect);
}
private TilePosition GetRandomTileExcludingRect(int width, int height, TileRect excludedRect)
{
var totalArea = width * height;
var entryRectArea = excludedRect.Area;
var availableTilesCount = totalArea - entryRectArea;
if (availableTilesCount == 0)
{
return(new TilePosition(0, 0));
}
var exitTileIndex = _random.Next() % availableTilesCount;
var tileIndex = 0;
for (var x = 0; x < width; x++)
{
for (var y = 0; y < height; y++)
{
var position = new TilePosition(x, y);
if (excludedRect.Contains(position))
{
continue;
}
if (tileIndex == exitTileIndex)
{
return(position);
}
tileIndex++;
}
}
return(TilePosition.Zero);
}
private TilePosition GetRandomPositionIn(TileRect rect)
{
var x = rect.Min.Y + _random.Next() % rect.Width;
var y = rect.Min.Y + _random.Next() % rect.Height;
return(new TilePosition(x, y));
}
public TilePosition GenerateExitPosition(int width, int height, TilePosition entryPosition)
{
var minX = entryPosition.X - _minDistanceFromExitToEntry;
var minY = entryPosition.Y - _minDistanceFromExitToEntry;
var maxX = entryPosition.X + _minDistanceFromExitToEntry;
var maxY = entryPosition.Y + _minDistanceFromExitToEntry;
var entryRect = new TileRect(minX, minY, maxX, maxY);
entryRect.Clamp(width, height);
return(GetRandomTileExcludingRect(width, height, entryRect));
}
