import java.awt.*;

public class Grid {

    Cell cell[][];
    int size;            // number of rows and cols
    int cellSize;
    int dX, dY;          // screen offset in pixels
    public int row, col; // row and column of last mouse click in the grid 
                         // (-1, -1) means click was outside the grid
    Color color = Color.black;

    public Grid (int rows, int cellSize, int offset) {
	size = rows;
	this.cellSize = cellSize;
	cell = new Cell[size][size];
	dX = offset;
	dY = offset;
	clear( );
    }

    public void clear () {
	for (int i=0; i<size; i++)
	    for (int j=0; j<size; j++)
		cell[i][j] = new Cell(dX+j*cellSize, dY+i*cellSize, 
				       cellSize);
	 row = col = -1;             // no cell selected yet
    }

    public void paint(Graphics g) {
	for (int i=0; i<size; i++)
	    for (int j=0; j<size; j++) 
		cell[i][j].paint(g);
    }
  
    public boolean contains (int x, int y) {
	// determines whethe  the grid contains the point x-y.
	// If so, set the values of row and col appropriately and return
	// true.  Otherwise, x-y is not in the grid, so set row and col 
	// to -1 and return false.
	for (int i=0; i<size; i++)
	    for (int j=0; j<size; j++) 
		if (cell[i][j].contains(x, y)) {
		    row = i;
		    col = j;
		    return true;
		}
	// System.out.println("inGrid: outside grid");
	row = col = -1;
	return false;
    }

    public Cell getCell(int r, int c) { return cell[r][c]; }

}