// Marty Stepp, CSE 142, Autumn 2008
// This program displays a set of cities and simulates dropping a bomb
// that "blows up" some of the cities by turning them red.
// It is a "client program" that uses the Point class we are creating.
// This version of the program makes use of methods inside Point objects.
//
// Expected output (once the program is finished):
// Blast site x/y? 100 100
// Blast radius? 75

import java.awt.*;
import java.io.*;
import java.util.*;

public class Bomb {
	public static void main(String[] args) throws FileNotFoundException {
		// read first line of file (# of cities) and make array to store each one
		Scanner input = new Scanner(new File("cities.txt"));
		int numCities = input.nextInt();
		Point[] cities = new Point[numCities];

		DrawingPanel panel = new DrawingPanel(200, 200);
		Graphics g = panel.getGraphics();
		
		for (int i = 0; i < numCities; i++) {
			// read each city's x/y data from the file
			cities[i] = new Point();
			cities[i].x = input.nextInt();
			cities[i].y = input.nextInt();
			cities[i].draw(g);
		}
		
		// prompt for info about bomb blast
		Scanner console = new Scanner(System.in);
		System.out.print("Blast site x/y? ");
		Point blast = new Point();
		blast.x = console.nextInt();
		blast.y = console.nextInt();
		System.out.print("Blast radius? ");
		int blastRadius = console.nextInt();
		
		// draw bomb blast
		g.setColor(Color.RED);
		g.drawOval(blast.x - blastRadius, blast.y - blastRadius,
				2 * blastRadius, 2 * blastRadius);
		
		// draw cities red that are hit by the bomb
		for (int i = 0; i < numCities; i++) {
			if (blast.distance(cities[i]) <= blastRadius) {
				panel.sleep(500);    // pause 500ms
				cities[i].draw(g);   // re-draw in red
			}
		}
	}
}