import java.awt.Color;
import java.awt.Graphics2D;


public class Grid {

	public static void drawWhateverInsideCell(Graphics2D g, int left, int top, int szSubFig) {
		// this is where you draw INSIDE the cell
	}

	public static void grid(Graphics2D g, int x, int y, int szSubFig, int rc) {
		int left = x;
		int top = y;
		for (int r = 0; r < rc; r++) {
			for (int c = 0; c < rc; c++) {
				g.setColor(Color.BLACK);
				g.drawRect(left, top, szSubFig, szSubFig);
				drawWhateverInsideCell(g, left, top, szSubFig);
				left = left + szSubFig; // comment out this line to learn how this works
			}
			top = top + szSubFig; // comment out this line to learn how this works
			left = x; // comment out this line to learn how this works
		}
	}

	public static void frame(Graphics2D g,int x, int y, int szSubFig, int rc) {
		int left = x;
		int top = y;
		int wh = szSubFig * rc;
		grid(g, x, y, szSubFig, rc);
		g.setColor(Color.RED);
		g.drawRect(left, top, wh, wh);
	}


	public static void main(String[] args) {
		DrawingPanel dp = new DrawingPanel(400,400);
		dp.setBackground(Color.WHITE);
		Graphics2D g = dp.getGraphics();
		frame(g, 0, 0, 100, 1);
		frame(g, 10, 120, 24, 5);
		frame(g, 150, 20, 40, 6);
		frame(g, 130, 275, 36, 3);
	}


}