// 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.
//
// This is the second version that utilizes our new methods in Point objects.

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

public class Bomb {
    public static void main(String[] args) throws FileNotFoundException {
        // read city data from file
        Scanner input = new Scanner(new File("cities.txt"));
        Point[] cities = readCities(input);
        
        // draw the cities
        DrawingPanel panel = new DrawingPanel(200, 200);
        Graphics g = panel.getGraphics();
        for (int i = 0; i < cities.length; i++) {
            cities[i].draw(g);
        }
        
        // 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();
        
        dropBomb(bomb, radius, cities, g);
    }
    
    // Reads the input file into an array of city points and returns it.
    public static Point[] readCities(Scanner input) {
        int numCities = input.nextInt();   // 6
        Point[] cities = new Point[numCities];
        for (int i = 0; i < numCities; i++) {
            cities[i] = new Point();
            cities[i].setLocation(input.nextInt(), input.nextInt());  // y
        }
        return cities;
    }
    
    // Drops a bomb at the given position and radius on the given cities.
    public static void dropBomb(Point bomb, int radius, Point[] cities, Graphics g) {
        g.setColor(Color.RED);
        g.drawOval(bomb.x - radius, bomb.y - radius, 2 * radius, 2 * radius);
        bomb.draw(g);

        // re-draw nuked cities in red
        for (int i = 0; i < cities.length; i++) {
            if (cities[i].distance(bomb) <= radius) {
                cities[i].draw(g);
            }
        }
    }
}