// Marty Stepp, CSE 142, Autumn 2009
// This "client" program displays a set of cities and simulates dropping a
// bomb that "blows up" some of the cities by turning them red.
//
// Expected output:
// Blast site x? 100
// Blast site y? 100
// Blast radius? 75

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

public class Bomb {
    public static void main(String[] args) throws FileNotFoundException {
        DrawingPanel panel = new DrawingPanel(200, 200);
        Graphics g = panel.getGraphics();

        // read city data from file
        Scanner input = new Scanner(new File("cities.txt"));
        int numCities = input.nextInt();   // 6
        Point[] cities = new Point[numCities];
        
        for (int i = 0; i < numCities; i++) {
            cities[i] = new Point();
            cities[i].x = input.nextInt();  // x
            cities[i].y = input.nextInt();  // y
        }
        
        // draw the cities
        for (int i = 0; i < numCities; i++) {
            g.fillOval(cities[i].x, cities[i].y, 3, 3);
            g.drawString("(" + cities[i].x + ", " + cities[i].y + ")",
                         cities[i].x, cities[i].y);
        }
        
        
        // drop the "bomb"
        Scanner console = new Scanner(System.in);
        Point bomb = new Point();
        System.out.print("Blast site x? ");
        bomb.x = console.nextInt();
        System.out.print("Blast site y? ");
        bomb.y = console.nextInt();
        System.out.print("Blast radius? ");
        int radius = console.nextInt();
        
        // drop the bomb >_<
        g.setColor(Color.RED);
        g.drawOval(bomb.x - radius, bomb.y - radius, 2 * radius, 2 * radius);

        // re-draw nuked cities in red
        for (int i = 0; i < numCities; i++) {
            // distance between bomb center and this city:
            // sqrt(dx^2 + dy^2)
            int dx = cities[i].x - bomb.x;
            int dy = cities[i].y - bomb.y;
            double distance = Math.sqrt(dx*dx + dy*dy);
            
            if (distance <= radius) {
                g.fillOval(cities[i].x, cities[i].y, 3, 3);
                g.drawString("(" + cities[i].x + ", " + cities[i].y + ")",
                             cities[i].x, cities[i].y);
            }
        }
    }
}