/// <summary>
/// Detects if the tetromino is placed in an allready occupied position.
/// </summary>
/// <returns><c>true</c>, if placed in occupied position, <c>false</c> otherwise.</returns>
/// <param name="tetromino">Tetromino.</param>
private bool IsPlacedInOccupiedPosition(Tetromino tetromino)
{
for (int row = 0; row < tetromino.GetRowCount(); ++row)
{
for (int column = 0; column < tetromino.GetColumnCount(); ++column)
{
if (tetromino.Shape[tetromino.Rotation, row, column] != 0 && 0 <= tetromino.AnchorPosition.Column + column && tetromino.AnchorPosition.Column + column < GRIDWIDTH && 0 <= tetromino.AnchorPosition.Row + row && tetromino.AnchorPosition.Row + row < GRIDHEIGHT && Field[tetromino.AnchorPosition.Row + row, tetromino.AnchorPosition.Column + column] != 0)
{
return(true);
}
}
}
return(false);
}
/// <summary>
/// Checks if tetromino is outside of the grid.
/// </summary>
/// <returns><c>true</c>, if withing grid, <c>false</c> otherwise.</returns>
/// <param name="tetromino">Tetromino.</param>
private bool IsWithingGrid(Tetromino tetromino)
{
for (int row = 0; row < tetromino.GetRowCount(); ++row)
{
for (int column = 0; column < tetromino.GetColumnCount(); ++column)
{
if (tetromino.Shape[tetromino.Rotation, row, column] != 0 && (tetromino.AnchorPosition.Column + column < 0 || GRIDWIDTH <= tetromino.AnchorPosition.Column + column || tetromino.AnchorPosition.Row + row < 0 || GRIDHEIGHT <= tetromino.AnchorPosition.Row + row))
{
return(false);
}
}
}
return(true);
}
/// <summary>
/// Checks if it is an interfering tetromino above.
/// </summary>
/// <returns><c>true</c>, if interfering tetromino above was detected, <c>false</c> otherwise.</returns>
/// <param name="tetromino">Tetromino.</param>
private bool IsInterferingTetrominoAbove(Tetromino tetromino)
{
GridPosition position = tetromino.AnchorPosition;
for (int row = 0; row < tetromino.GetRowCount(); ++row)
{
for (int column = 0; column < tetromino.GetColumnCount(); ++column)
{
if (tetromino.Shape[tetromino.Rotation, row, column] != 0 && row + position.Row - 1 < 0 && Field[position.Row + row - 1, position.Column + column] != 0)
{
return(true);
}
}
}
return(false);
}
/// <summary>
/// Checks if the tetromino is at top row.
/// </summary>
/// <returns><c>true</c>, if collision at top row was detected, <c>false</c> otherwise.</returns>
/// <param name="tetromino">Tetromino.</param>
public bool IsAtTopRow(Tetromino tetromino)
{
GridPosition position = tetromino.AnchorPosition;
for (int row = 0; row < tetromino.GetRowCount(); ++row)
{
for (int column = 0; column < tetromino.GetColumnCount(); ++column)
{
if (tetromino.Shape[tetromino.Rotation, row, column] != 0 && row + position.Row - 1 < 0)
{
return(true);
}
}
}
return(false);
}
/// <summary>
/// Checks if is is a tetromino below makes it impossible to move that way.
/// </summary>
/// <returns><c>true</c>, if interfering tetromino below was detected, <c>false</c> otherwise.</returns>
/// <param name="tetromino">Tetromino.</param>
private bool IsInterferingTetrominoBelow(Tetromino tetromino)
{
GridPosition position = tetromino.AnchorPosition;
for (int row = 0; row < tetromino.GetRowCount(); ++row)
{
for (int column = 0; column < tetromino.GetColumnCount(); ++column)
{
if (tetromino.Shape[tetromino.Rotation, row, column] != 0 && (position.Row + row + 1) < GRIDHEIGHT && 0 <= position.Column + column && position.Column + column < GRIDWIDTH && Field[position.Row + row + 1, position.Column + column] != 0)
{
return(true);
}
}
}
return(false);
}
/// <summary>
/// Checks if the tetromino will go outside the grid to the right if it gets moved by one.
/// </summary>
/// <returns><c>true</c>, if collision at the right edge was detected, <c>false</c> otherwise.</returns>
/// <param name="tetromino">Tetromino.</param>
public bool IsAtRightEdge(Tetromino tetromino)
{
GridPosition position = tetromino.AnchorPosition;
for (int row = 0; row < tetromino.GetRowCount(); ++row)
{
for (int column = 0; column < tetromino.GetColumnCount(); ++column)
{
if (tetromino.Shape[tetromino.Rotation, row, column] != 0 && GRIDWIDTH <= column + position.Column + 1)
{
return(true);
}
}
}
return(false);
}
/// <summary>
/// Places the tetromino on the grid if it is not placed allready.
/// </summary>
/// <param name="tetromino">Tetromino.</param>
public void PlaceOnGrid(Tetromino tetromino)
{
if (!tetromino.IsLockedInPlace)
{
GridPosition position = tetromino.AnchorPosition;
for (int row = 0; row < tetromino.GetRowCount(); ++row)
{
for (int column = 0; column < tetromino.GetColumnCount(); ++column)
{
if (tetromino.Shape[tetromino.Rotation, row, column] != 0)
{
Field[position.Row + row, position.Column + column] = tetromino.Color;
}
}
}
tetromino.IsLockedInPlace = true;
}
}