This code defines a method `canPlaceTetromino` in a Java class,...

This code defines a method canPlaceTetromino in a Java class, which determines whether the current Tetromino (a piece in a Tetris game) can be placed on the game board at a specific position (x, y) and in a given rotation.

What each part of the code does:

1. Point[] blocks = currentTetromino.getBlocks(rotation);

   • Gets the relative coordinates (as an array of Point objects) of the blocks making up the Tetromino in its specified rotation.
   • Each Point represents the relative position of one block of the Tetromino.

2. for (Point block : blocks) { ... }

   • Iterates through each block of the Tetromino to calculate its position on the game board when placed at (x, y).

3. int boardX = x + block.x; and int boardY = y + block.y;

   • Calculates the absolute position of each block on the game board by adding the Tetromino's relative block positions (block.x, block.y) to the specified (x, y) position.

4. if (boardX < 0 || boardX >= BOARD_WIDTH || boardY < 0 || boardY >= BOARD_HEIGHT)

   • Checks if the block goes out of bounds of the game board.
   • If the block's position is outside the valid board dimensions, the Tetromino cannot be placed, so the function returns false.

5. if (board[boardY][boardX] != 0)

   • Checks if the corresponding position on the board is already occupied (assuming 0 represents an empty square and non-zero values represent occupied squares).
   • If any of the Tetromino's blocks overlaps with an occupied square, the function returns false.

6. If no invalid positions are detected through the loop:

   • If all blocks of the Tetromino are within bounds and do not overlap with occupied squares, the method will eventually return true, indicating that the Tetromino can be placed at the given position and rotation.

Summary:

The canPlaceTetromino method verifies whether the current Tetromino can be placed at position (x, y) on the game board with the specified rotation. It checks both for boundary violations and for collisions with already occupied squares on the board.