package algs12;
import stdlib.*;
/* ***********************************************************************
 *  Compilation:  javac VisualAccumulator.java
 *
 *************************************************************************/


public class XVisualAccumulator {
  private double total;
  private int N;

  public XVisualAccumulator(int trials, double max) {
    StdDraw.setXscale(0, trials);
    StdDraw.setYscale(0, max);
    StdDraw.setPenRadius(.005);
  }

  public void addDataValue(double val) {
    N++;
    total += val;
    StdDraw.setPenColor(StdDraw.DARK_GRAY);
    StdDraw.point(N, val);
    StdDraw.setPenColor(StdDraw.RED);
    StdDraw.point(N, mean());
  }

  public double mean() {
    return total / N;
  }

  public String toString() {
    return "Mean (" + N + " values): " + String.format("%8.5f", mean());
  }

  public static void main (String[] args) {
    args = new String[] { "1000" };
    int T = Integer.parseInt (args[0]);
    XVisualAccumulator a = new XVisualAccumulator (T, 1.0);
    for (int t = 0; t < T; t++)
      a.addDataValue (StdRandom.random ());
    StdOut.println (a);
  }
}