/*
CSE 142, Autumn 2007, Marty Stepp

This program reads an input file of test scores (integers) and 
displays a histogram of the score distribution.
*/

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

public class Histogram {
    public static void main(String[] args) throws FileNotFoundException {
        // tally up all the scores into an array
        // e.g. tally[83] stores how many people got an 83 on the exam
        Scanner input = new Scanner(new File("scores.txt"));
        int[] tally = new int[101];
        while (input.hasNextInt()) {
            int score = input.nextInt();
            tally[score]++;
        }
        
        // now that we've finished counting, print the results
        for (int i = 0; i < tally.length; i++) {
            if (tally[i] > 0) {
                System.out.print(i + ": ");
                
                // print tally[i] number of stars;
                // for example, if 4 people got an 83, then print 4 stars
                for (int j = 0; j < tally[i]; j++) {
                    System.out.print("*");
                }
                System.out.println();
            }
        }
        
        // draw a graphical histogram of the data
        DrawingPanel p = new DrawingPanel(400, 400);
        Graphics g = p.getGraphics();
        for (int i = 0; i < tally.length; i++) {
            // each line is 4 px apart, starts at the bottom of the panel (y=400),
            // and goes up by 15 pixels for each person who got that exam score
            g.drawLine(i * 4, 400, i * 4, 400 - (15 * tally[i]));
        }
    }
}