// CSE 142, Summer 2008, Helene Martin
 
// Reads a file of student midterm scores and
// displays the score counts as a histogram.
// This main is a great summary of the program's behavior.

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

public class Histogram {
	public static void main(String[] args) throws FileNotFoundException {
		Scanner input = new Scanner(new File("midterm_scores.txt"));
		int[] scores = tallyScores(input);
		
		consoleHistogram(scores);
		drawHistogram(scores);
   }
	
	// Counts how many people got each score and returns an array
	// containing the counts.
	public static int[] tallyScores(Scanner input) {
		int[] scores = new int[102]; // scores range from 0 to 101
		
		while(input.hasNextInt()) {
			int score = input.nextInt();
			scores[score]++;
		}
		return scores;
	}
	
	// Outputs an ASCII histogram to the console.
	public static void consoleHistogram(int[] scores) {
		for(int i = 0; i < scores.length; i++){
			System.out.print(i + ": ");
			
			// print a * for each person who got a score of i 
			for(int j = 0; j < scores[i]; j++) {
				System.out.print("*");
			}
			System.out.println();
		}
	}
	
	// Draws a histogram on a DrawingPanel.
	public static void drawHistogram(int[] scores) { 
		DrawingPanel p = new DrawingPanel(scores.length * 3, 100);
		Graphics g = p.getGraphics();
		
		for(int i = 0; i < scores.length; i++) {
			g.drawLine(i * 3 + 3, 100, i * 3 + 3, 100 - scores[i] * 10);
		}
	}
}