/* Usage of this class -
   PlotRoller PlotPt = new PlotRoller(int fx, int fy);
   g.fillOval(PlotPt.xpoint(), PlotPt.ypoint(), 4,4); */

class PlotRoller {
  private double mfx = 0.0, mfy = 0.0;
  private boolean inside=false;

  //default constructor
  public PlotRoller() {
    this.mfx=0.0; this.mfy=0.0;
  }

  //constructor
  public PlotRoller(int fx, int fy) {
    this.mfx = (double)fx;
    this.mfy = -(double)fy;
  }

  //method to return x plot value
  public int xpoint() {
    double fx = (150-(-mfy))/50;
    fx = 200*fx + 100;
    return (int)fx;
  }

  //method to return y plot value
  public int ypoint() {
    double fy = Math.tan(Math.acos(1- ((150-(-mfy))/50) ));
    fy = 430-(fy*20);
    return (int)fy;
  }

  //method to return x value
  public double xval() {
    double fx = (150-(-mfy))/50;
    return fx;
  }

  //method to return y value
  public double yval() {
    double fy = Math.tan(Math.acos(1- ((150-(-mfy))/50) ));
    return fy;
  }

  //method to return x plot value from circles edge
  public int xcircle() {
    double fx = Math.sqrt(50*50 - (100-(-mfy))*(100-(-mfy)));
    fx = fx+100;
    return (int)fx;
  }

  //method to return x plot value for "N"
  public int NXVal() {
    double nfx;
    double fx = Math.sqrt(50*50 - (100-(-mfy))*(100-(-mfy)));
    fx = fx+100;
    nfx = Math.abs((200-100)/(-mfy-100)*(fx-100)) + 100;
    return (int) nfx;
  }

  //method to see if "inside" valid region
  public boolean isInside() {
    if ( (mfx>100) & (-mfy>100) & (-mfy<150) ) inside=true;
    else inside=false;
    return inside;
  }
}