/// <summary>
/// Method <c>HoldBlock()</c>
/// sets the heldBlock to the current block, and then sets the current block to
/// the next block.
/// </summary>
public void HoldBlock()
{
if (HeldBlock.Count == 0)
{
_heldShape = _shapeFactory.BuildShape(_shape);
for (int i = 0; i < 4; i++)
{
Blocks.Remove(x => x.GridX == _shape.ShapeBlocks[i].GridX &&
x.GridY == _shape.ShapeBlocks[i].GridY);
}
_shape = _nextShape;
_shape.CenterShape();
Blocks.AddRange(_shape.ShapeBlocks);
_nextShape = _shapeFactory.BuildRandomShape();
NextBlock.Clear();
NextBlock.AddRange(_nextShape.ShapeBlocks);
HeldBlock.AddRange(_heldShape.ShapeBlocks);
}
else
{
HeldBlock.Clear();
var tempShape = _heldShape;
_heldShape = _shapeFactory.BuildShape(_shape);
for (int i = 0; i < 4; i++)
{
Blocks.Remove(x => x.GridX == _shape.ShapeBlocks[i].GridX &&
x.GridY == _shape.ShapeBlocks[i].GridY);
}
_shape = tempShape;
_shape.CenterShape();
Blocks.AddRange(_shape.ShapeBlocks);
HeldBlock.AddRange(_heldShape.ShapeBlocks);
}
}