/*
Copyright 2001 by Ralph Hartley
This software is licenced under the terms of the
Gnu Public Licence
*/

import java.io.*;
import java.util.*;
import  org.w3c.dom.*;

public class Shot implements Serializable,Comparable,Displacement {

  private static final long serialVersionUID = 38512345874339L;

  public Station from;
  public Station to;

  public double dist = 0;
  public double az = 0;
  public double inc = 0;

  public String diststr;
  public String azstr;
  public String incstr;

  Element element;

  public Shot(Station from,Station to,String dist,String az,String inc,String unit,Element element) {
    this.azstr=az;
    this.incstr=inc;
    this.diststr=dist;

    if (az!=null) {
      try {
	this.az = Double.parseDouble(az);
      } catch (NumberFormatException ex) {}
    }

    if (inc!=null) {
      try {
	this.inc = Double.parseDouble(inc);
      } catch (NumberFormatException ex) {}
    }

    if (dist!=null) {
      try {
	this.dist = Double.parseDouble(dist);
      } catch (NumberFormatException ex) {}
    }

    if (unit != null) {
      if (unit.equals("meters"))
	this.dist *= 3.281;
      if (unit.equals("yards"))
	this.dist *= 3;
    }

    this.from=from;
    this.to=to;
    to.shots.add(this);
    from.shots.add(this);
    this.element = element;
  }


  public double vertical() {
    return(dist * Math.sin(Math.PI*inc/180));
  }

  public double verticalVar() {
    double std = dist * Math.cos(Math.PI*inc/180);
    return(std*std);
  } 

  public void reverse() {
    Station temp = from;
    from = to;
    to = temp;
    az = (az + 180 +360)%360;
    inc = -inc;
  }

  public String toString() {
    return("SHOT:"+from+"-"+to);
  }

  public int compareTo(Object that) {
    return(toString().compareTo(that.toString()));
  }

  public boolean equals(Object that) {
    return(toString().equals(that.toString()));
  }
}