Board.java

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import java.awt.Color;
import java.awt.GridLayout;
import javax.swing.BorderFactory;
import javax.swing.JLabel;
import javax.swing.border.Border;

/**
 *
 * @author James
 */
public class Board extends javax.swing.JPanel {

    private int[][] grid;
    private JLabel[][] labelGrid;
    private Tetrimino piece;
    
    /**
     * Creates new form Board
     */
    public Board(int[][] grid, Tetrimino piece) {
        //initComponents();
        this.grid = grid;
        this.piece = piece;
        setLayout(new GridLayout(grid.length-4, grid[0].length));
        init();
    }
    
    public void init()
    {     
        //build grid
        labelGrid = new JLabel[grid.length-4][grid[0].length];
        Border border = BorderFactory.createLineBorder(Color.BLACK);
        for (int i = 0; i < labelGrid.length; i++)
        {
            for (int j = 0; j < labelGrid[0].length; j++)
            {
                labelGrid[i][j] = new JLabel();
                labelGrid[i][j].setBorder(border);
                labelGrid[i][j].setOpaque(true);
                labelGrid[i][j].setBackground(Color.LIGHT_GRAY);
                add(labelGrid[i][j]);
            }
        }
        repaint();
        validate();
    }
 
    public void update()
    {
        for (int i = 0; i < labelGrid.length; i++)
        {
            for (int j = 0; j < labelGrid[0].length; j++)
            {
                int med = grid[i+4][j];
                if (med == -1) 
                {
                    med = this.piece.getType();
                }
                
                if (med == 0) labelGrid[i][j].setBackground(Color.LIGHT_GRAY);
                else if (med == 1) labelGrid[i][j].setBackground(Color.RED);
                else if (med == 2) labelGrid[i][j].setBackground(Color.YELLOW);
                else if (med == 3) labelGrid[i][j].setBackground(Color.GREEN);
                else if (med == 4) labelGrid[i][j].setBackground(Color.ORANGE);
                else if (med == 5) labelGrid[i][j].setBackground(Color.CYAN);
                else if (med == 6) labelGrid[i][j].setBackground(Color.BLUE);
                else labelGrid[i][j].setBackground(Color.MAGENTA);
            }
        }
        repaint();
        validate();
    }
    
    //starts from bottom and heads up, looking for lines to clear; returns false when there's nothing
    public int clearLine()
    {
        int count = 0;
        for (int i = grid.length-1; i >= 1;)
        {
            //check if it's a row to remove
            boolean z = true;
            for (int j = 0; j < grid[i].length; j++)
            {
                if (grid[i][j] == 0)
                {
                    z = false;
                    break;
                }
            }
            
            //remove it, shift everything down one
            if (z)
            {
                for (int k = i; k >= 1; k--)
                {
                    for (int l = 0; l < grid[i].length; l++)
                    {
                        grid[k][l] = grid[k-1][l];
                    }
                }
                count++;
            } else
            {
                i--;
            }
        }
        return count;
    }
    
    public void clear()
    {
        for (int i = 0; i < grid.length; i++)
        {
            for (int j = 0; j < grid[0].length; j++)
            {
                grid[i][j] = 0;
            }
        }
        update();
    }
    
    //because apparently java refuses to update the object
    public void setPiece(Tetrimino piece)
    {
        this.piece = piece;
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        setLayout(new java.awt.GridLayout());
    }// </editor-fold>//GEN-END:initComponents


    // Variables declaration - do not modify//GEN-BEGIN:variables
    // End of variables declaration//GEN-END:variables
}