internal bool Drop(IBlockArea blockArea)
{
var newPos = new Point(Position.X, Position.Y + 1);
if (!IsValidDropPoint(newPos, blockArea))
return false;
Position = new Point(newPos.X, newPos.Y);
return true;
}
internal bool Move(Direction direction, IBlockArea blockArea)
{
if (direction != Direction.Right && direction != Direction.Left)
throw new ArgumentException("Only left and right directions are supported", "direction");
int shift = direction == Direction.Right ? 1 : -1;
var newPos = new Point(Position.X + shift, Position.Y);
for (int x = 0; x < Size; x++)
for (int y = 0; y < Size; y++)
if (_blocks[x, y] != null &&
(x + newPos.X >= Constants.BlockAreaSizeX || x + newPos.X < 0 || blockArea.IsOccupied(x + newPos.X, y + newPos.Y)))
return false;
Position = new Point(newPos.X, newPos.Y);
return true;
}
internal bool IsValidDropPoint(Point position, IBlockArea blockArea)
{
for (int x = 0; x < Size; x++)
for (int y = 0; y < Size; y++)
if (_blocks[x, y] != null &&
(y + position.Y >= Constants.BlockAreaSizeY || blockArea.IsOccupied(x + position.X, y + position.Y)))
return false;
return true;
}
// Rotation algorithm from Stackoverflow
internal bool Rotate(Direction direction, IBlockArea blockArea)
{
if (direction != Direction.Right && direction != Direction.Left)
throw new ArgumentException("Only left and right directions are supported", "direction");
if (Position.Y < 0)
return false;
var newBlocks = new Block[Size,Size];
if (direction == Direction.Left)
for (int x = 0; x < Size; ++x)
for (int y = 0; y < Size; y++)
newBlocks[x, y] = _blocks[Size - y - 1, x];
else // direction == Direction.Right
for (int x = 0; x < Size; ++x)
for (int y = 0; y < Size; y++)
newBlocks[x, y] = _blocks[y, Size - x - 1];
for (int x = 0; x < Size; x++)
for (int y = 0; y < Size; y++)
if (newBlocks[x, y] != null && blockArea.IsOccupied(x + Position.X, y + Position.Y))
return false;
_blocks = newBlocks;
return true;
}