/* Determine the world coordinates for the Blocks in the Tetromino and
* let the Board keep the Block reference in that cell.
*/
void FixToBoard()
{
bool[,] grid = BlockMatrix.PatternFor(pattern, rotation);
for (int i = 0; i < BlockMatrix.GRID_SIZE; i++)
{
for (int j = 0; j < BlockMatrix.GRID_SIZE; j++)
{
if (grid [j, i])
{
int x = (int)Coordinates.x + i;
int y = (int)Coordinates.y + j;
Vector2 target = new Vector2(x, y);
Block transfer = blocks [0];
blocks.RemoveAt(0);
board.Fix(target, transfer);
}
}
}
Destroy(gameObject);
board.CompleteLines();
}
/* Take a reading from the board and see if anything would block the Tetromino
* from moving to a new location.
*
* @param direction Target offset from current location (zero for rotation)
* @param rotation Desired rotation in new position
* @return False if move is impossible
*/
bool ValidateMove(Vector2 direction, int rotation)
{
// Specify the location the Tetromino is attempting to move to
Vector2 target = Coordinates + direction;
// Grab the cells at that location and a copy of the Tetromino pattern
bool[,] testGrid = board.CreateTestGrid(target);
bool[,] patternGrid = BlockMatrix.PatternFor(pattern, rotation);
// Ensure there are gaps in the board whenever there are blocks in the pattern
for (int row = 0; row < BlockMatrix.GRID_SIZE; row++)
{
for (int column = 0; column < BlockMatrix.GRID_SIZE; column++)
{
// If the testgrid is already occupied where the tetromino is trying to go, fail
if (testGrid [row, column] && patternGrid [row, column])
{
return(false);
}
}
}
// Looks like we're good to go!
return(true);
}
/**
* Position the Blocks within the Tetromino grid after a rotation etc.
*/
void Draw()
{
// Retrieve the pattern for drawing
bool[,] patternGrid = BlockMatrix.PatternFor(pattern, rotation);
int count = 0;
// Pass over the grid, placing Blocks whenever a slot is occupied
for (int row = 0; row < BlockMatrix.GRID_SIZE; row++)
{
for (int column = 0; column < BlockMatrix.GRID_SIZE; column++)
{
// Don't forget: matrices store values (y,x) ...
if (patternGrid[column, row])
{
// ... but screen coordinates are (x,y)!
Vector2 position = gridAlignmentOffset + new Vector2(row, 0 - column);
blocks [count++].transform.localPosition = position;
}
}
}
}