An example project - An Introduction to Graphical User Interfaces with Java Swing - page 129

File: its/BlockPuzzle/BoardModel.java

package its.BlockPuzzle; 1.

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public class BoardModel{

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private int noOfRows, noOfCols;

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private int [][] board; // The board as an array

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private int [] rowOfBlock; // The number of the row of every block

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private int [] colOfBlock; // The number of the column of every block

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public BoardModel( int nr, int nc){

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noOfRows = nr;

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noOfCols = nc;

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board = new int [noOfRows][noOfCols];

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rowOfBlock = new int [noOfRows * noOfCols];

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colOfBlock = new int [noOfRows * noOfCols];

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// initialize the board. The blocks are

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// numbered row-wise 1,2,...

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int kk=1;

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for ( int r=0; r < noOfRows; r++){

for ( int c=0; c < noOfCols; c++){ 21.

if (kk < noOfRows * noOfCols){ 22.

board[r][c] = kk; 23.

rowOfBlock[kk] = r; 24.

colOfBlock[kk] = c; 25.

kk++; 26.

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}

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}// for c

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}// for r

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// ... and the missing block is at the lower right.

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board [noOfRows-1][noOfCols-1] = 0;

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rowOfBlock[0] = noOfRows-1;

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colOfBlock[0] = noOfCols-1;

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}

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public boolean moveIt(MoveModel mm){

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int dir = mm.getDirection();

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int block = mm.getBlockNumber();

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int row = rowOfBlock[block];

int col = colOfBlock[block]; 41.

boolean ok = true ; 42.

// an UP move is possible if the missing block 43.