/* Judy Yang
 * CS210
 * 4/5/11
 * 
 * The class extends JPanel and draws a grid of squares (each square
 * represents a cell) that represents a grid of cells that are either
 * alive or dead depending on the values held in the GameOfLife
 * class. This paintComponent method in this class gets the values of
 * each cell from the GameOfLife class and colors a cell rose-pink if
 * it is dead and navy blue if it is alive. This class also keeps
 * track of where the mouse is clicked so the user can choose to
 * change whether a cell is alive or dead by clicking on it.
 */


import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.BorderFactory;
import javax.swing.JPanel;



public class CellGrid extends JPanel implements MouseListener {
	
	// RGB values of the color of a dead cell
	private static final int C1R = 190;
	private static final int C1G = 131;
	private static final int C1B = 143;
	// RGB values of the color of a live cell
	private static final int C2R = 36;
	private static final int C2G = 42;
	private static final int C2B = 127;
	
	// the size of the grid
	private int gridSize;
	
	// the Game of Life rendered in this JPanel
	private GameOfLife gol;
	

	// the location of the user's mouse click
	private int xClick = 0;
	private int yClick = 0;
	


	
	// creates a JPanel, sets the background to white, gets the
	// size of the game's grid from the GameOfLife gol
	public CellGrid(GameOfLife gol) {
		
	    // creates a JPanel by calling the constructor of the superclass
	    super();
	    
	    //sets gol to the gol sent in as a parameter
	    this.gol = gol;
	    
	    
		// gets the size of the GameOfLife grid
	    gridSize = gol.getSize();
	    
	    // sets the background of the JPanel to white
	    setBackground(Color.white);
	    
	    // adds this JPanel as a mouse listener
	    addMouseListener(this);
	}


    // draws a grid of rectangles that for each cell from the
    // GameOfLife and colors them pink for dead and blue for live
    public void paintComponent(Graphics g){
	
		// colors the background of the JPanel
		super.paintComponent(g);
		
		// the length and width of each square cell
		int length = 15;
		
		for (int i = 0; i < gridSize; i++) {
		    for (int j = 0; j < gridSize; j++){
			
			// if the mouse has not been clicked, color
			// the grid according to the current values
			// held in gol's gameGrid
			if (xClick == 0 && yClick == 0){
			    if (gol.isLive(j, i)) g.setColor(new Color(C2R, C2G, C2B));
			    else g.setColor(new Color(C1R, C1G, C1B));
			}
			// if the mouse has been clicked, find where
			// the mouse has been clicked and change the
			// cell to live if dead before, or to dead if
			// live before and then color the cell
			// accordingly
			if (xClick > i*length && xClick < (i+1)*length && 
			    yClick > j*length && yClick < (j+1)*length) {
			    gol.change(j, i);
			    if (gol.isLive(j, i)) g.setColor(new Color(C2R, C2G, C2B));
			    else g.setColor(new Color(C1R, C1G, C1B));
			}
			// if the mouse has been clicked, color the
			// rest of the grid accordingly
			else {
			    if (gol.isLive(j, i)) g.setColor(new Color(C2R, C2G, C2B));
			    else g.setColor(new Color(C1R, C1G, C1B));
			}
			
			
			
			// make a filled rectangle at the specified
			// location
			g.fillRect(i*length, j*length, length, length);
			// make the outlines of the rectangles and
			// color them black
			g.setColor(Color.black);
			g.drawRect(i*length, j*length, length, length);
			
			
		    }
		}
		
		// reset where the mouse was clicked back to zero
		xClick = yClick = 0;
		
    }
    
    
    // gets the x and y values of where the mouse is clicked when the
    // mouse is clicked
    public void mouseClicked(MouseEvent arg0) {
	
	// gets the x and y values of the location where the mouse is
	// clicked and sets xClick and yClick to the values
	// respectively and calls repaint
	xClick = arg0.getX();
	yClick = arg0.getY();
	repaint();
    }
    
    public void mouseEntered(MouseEvent arg0) {}
    public void mouseExited(MouseEvent arg0) {}
    public void mousePressed(MouseEvent arg0) {}
    public void mouseReleased(MouseEvent arg0) {}
    
}