private Shape GenerateShape()
{
if (_shapeTypeIndex == _shapeTypes.Length)
{
_shapeTypeIndex = 0;
ShuffleShapeTypes();
}
var shapeNum = _shapeTypes[_shapeTypeIndex++];
var shape = new Shape((ShapeType) shapeNum);
int xOffset = -2;
if (shape.Type == ShapeType.O)
xOffset = -1;
shape.SetPosition(Constants.BlockAreaSizeX / 2 + xOffset, -1);
return shape;
}
public void Update(GameTime gameTime)
{
if (_gameOver)
return;
if (_currentShape == null)
{
_currentShape = _nextShape ?? GenerateShape();
_currentShapeBlocks = _currentShape.GetBlocks();
_nextShape = GenerateShape();
_nextShapeBlocks = _nextShape.GetBlocks();
_moveTimeElapsed = 0.0;
}
if (InputHandler.KeyPressed(Keys.Right))
_currentShape.Move(Direction.Right, this);
else if (InputHandler.KeyPressed(Keys.Left))
_currentShape.Move(Direction.Left, this);
else if (InputHandler.KeyPressed(Keys.Up))
if (_currentShape.Rotate(Direction.Right, this))
_currentShapeBlocks = _currentShape.GetBlocks();
// Calculate ghost shape position
_ghostPosition = new Point(_currentShape.Position.X, _currentShape.Position.Y);
for (int y = _ghostPosition.Y + 1; y < Constants.BlockAreaSizeY; y++)
if (_currentShape.IsValidDropPoint(new Point(_ghostPosition.X, y), this))
_ghostPosition.Y = y;
else
break;
_moveTimeElapsed += gameTime.ElapsedGameTime.TotalSeconds;
var userDrop = InputHandler.KeyDown(Keys.Down);
if (!(_moveTimeElapsed >= ShapeMoveDelay + _shapeMoveDelayMod) && !userDrop)
return;
if (_moveTimeElapsed >= ShapeMoveDelay + _shapeMoveDelayMod)
_moveTimeElapsed -= ShapeMoveDelay + _shapeMoveDelayMod;
var shapePos = new Point(_currentShape.Position.X, _currentShape.Position.Y);
if (!_currentShape.Drop(this))
{
for (int x = 0; x < _currentShape.Size; x++)
for (int y = 0; y < _currentShape.Size; y++)
{
var block = _currentShapeBlocks[x, y];
if (block == null)
continue;
PlaceAt(block, x + shapePos.X, y + shapePos.Y);
}
_currentShape = null;
}
else if (userDrop)
OnUserDrop();
// Check for filled rows
var rows = new Queue<int>(); // Queue: first-in -> first-out
// Loop through all rows, top to bottom, adding any full rows to the queue
for (int y = 0; y < Constants.BlockAreaSizeY; y++)
for (int x = 0; x < Constants.BlockAreaSizeX; x++)
{
if (_blocks[x, y] == null)
break;
if (x == Constants.BlockAreaSizeX - 1)
rows.Enqueue(y);
}
while (rows.Count > 0)
{
var row = rows.Dequeue();
for (int x = 0; x < Constants.BlockAreaSizeX; x++)
RemoveAt(x, row);
for (int y = row - 1; y > 0; y--)
for (int x = 0; x < Constants.BlockAreaSizeX; x++)
if (_blocks[x, y] != null)
{
PlaceAt(_blocks[x, y], x, y + 1);
RemoveAt(x, y);
}
_shapeMoveDelayMod -= ShapeMoveDelayModStep;
OnLineCleared();
}
for (int x = 0; x < Constants.BlockAreaSizeX; x++)
if (_blocks[x, 0] != null)
{
_gameOver = true;
OnGameOver();
}
}