public void RotateShape()
{
if (ShapeIsOutOfTopOrBottomModelBorders())
{
return;
}
var nextStateOfCurrentShape = _currentShape.Clone() as Shape;
nextStateOfCurrentShape.CurrentState = _currentShape.CurrentState == ShapeState.DegreeRotation270 ? ShapeState.Base : _currentShape.CurrentState + 1;
// Check the next shape state for out of model borders.
if (_currentShape.LocationY + nextStateOfCurrentShape.BottomBorder > _modelHeight - 1 ||
_currentShape.LocationX + nextStateOfCurrentShape.LeftBorder < 0 ||
_currentShape.LocationX + nextStateOfCurrentShape.RightBorder > _modelWidth - 1)
{
return;
}
// Check the next shape state for contact with other shapes.
for (var i = nextStateOfCurrentShape.TopBorder; i <= nextStateOfCurrentShape.BottomBorder; i++)
{
for (var j = nextStateOfCurrentShape.LeftBorder; j <= nextStateOfCurrentShape.RightBorder; j++)
{
if (Model[nextStateOfCurrentShape.LocationY + i, nextStateOfCurrentShape.LocationX + j] != BlockType.Empty &&
nextStateOfCurrentShape.States[nextStateOfCurrentShape.CurrentState][i, j] != BlockType.Empty &&
_currentShape.States[_currentShape.CurrentState][i, j] == BlockType.Empty)
{
return;
}
}
}
EraseCurrentShape();
_currentShape.CurrentState = nextStateOfCurrentShape.CurrentState;
PlaceCurrentShape();
}