/**
    @(#)TestXMatrix.java 2009
    adolfo@di-mare.com
    Datos de prueba para {@code xMatrix()}.

    @author Adolfo Di Mare <adolfo@di-mare.com>
*/

import junit.framework.*;

/** Datos de prueba para {@code xMatrix()}. */
public class TestXMatrix extends TestCase {

    /** Rellena con una gran "X" la matriz cuadrada {@code M[][]}.
      * <ul><li> Si {@code M[][]} no es cuadrada, la deja igual.</li>
      * <li> Pone la letra {@code 'X'} en las 2 diagonales de la matriz.</li>
      * <li> Graba un espacio en blanco en el resto de la matriz.</li></ul>
      */
    public static void xMatrix( char M[][] ) {
        if ( M.equals(null) ) { // M[][] no existe todavía
            return;
        }
        else if ( M.length==0 ) {
            return;
        }
        else if ( M[0].length != M.length ) {
            return; // M[][] no es cuadrada
        }
        if ( true ) {
            /******************************\
            *                              *
            *   RELLENE CON SU ALGORITMO   *
            *                              *
            \******************************/
        }
        return;
    }
    /*
        0   1   2   3   4   5   6   7   8   9   10
      +---+---+---+---+---+---+---+---+---+---+
    0 | X |   |   |   |   |   |   |   |   | X |
      +---+---+---+---+---+---+---+---+---+---+
    1 |   | X |   |   |   |   |   |   | X |   |
      +---+---+---+---+---+---+---+---+---+---+
    2 |   |   | X |   |   |   |   | X |   |   |
      +---+---+---+---+---+---+---+---+---+---+
    3 |   |   |   | X |   |   | X |   |   |   |
      +---+---+---+---+---+---+---+---+---+---+
    4 |   |   |   |   | X | X |   |   |   |   |
      +---+---+---+---+---+---+---+---+---+---+
    5 |   |   |   |   | X | X |   |   |   |   |
      +---+---+---+---+---+---+---+---+---+---+
    6 |   |   |   | X |   |   | X |   |   |   |
      +---+---+---+---+---+---+---+---+---+---+
    7 |   |   | X |   |   |   |   | X |   |   |
      +---+---+---+---+---+---+---+---+---+---+
    8 |   | X |   |   |   |   |   |   | X |   |
      +---+---+---+---+---+---+---+---+---+---+
    9 | X |   |   |   |   |   |   |   |   | X |
      +---+---+---+---+---+---+---+---+---+---+
    */

    /** test -> {@code xMatrix()}. */
    public void test_xMatrix() {
        for ( int N=0; N<166; ++N ) {
            char M[][]= new char[N][N];
            xMatrix( M ); // grabaMatrix( M );
            int diag = 0, contraDiag = 0;
            for ( int i=0; i<N; ++i ) {
                contraDiag = ( contraDiag>0 ? contraDiag-1 : N-1 );
                for ( int j=0; j<N; ++j ) {
                    if ( diag == i ) {
                        assertTrue( M[i][j] == 'X' );
                    }
                    else if ( contraDiag == j ) {
                        assertTrue( M[i][j] == 'X' );
                    }
                    else {
                        assertTrue( M[i][j] == ' ' );
                    }
                    diag++;  diag %= N;
                }
            }
        }
    }

    /** Graba el valor completo de la matriz {@code M[][]}.
      */
    public static void grabaMatrix( char M[][] ) {
        for ( int i=0; i<M.length; ++i ) {
            for ( int j=0; j<M[i].length; ++j ) {
                System.out.print( M[i][j] );
            }
            System.out.println( );
        }
    }

}

// EOF: TestXMatrix.java