/*
Copyright 2000 by Ralph Hartley
This software is licenced under the terms of the
Gnu Public Licence
*/
import java.io.*;

public class MapScale implements Serializable,Cloneable {

  private static final long serialVersionUID = Version.getSUID();

  public Unit display = Unit.inch;
  public Unit map = Unit.foot;
  public transient double metersperpixel = -1;

  public MapScale(Unit disp,Unit m) {
    display = disp;
    map = m;
  }

  public MapScale(Unit disp,Unit m,double metersperpixel) {
    display = disp;
    map = m;
    this.metersperpixel=metersperpixel;
  }

  public MapScale(double fact,Unit dispbase,Unit m,double metersperpixel) {
    this(new Unit(fact,dispbase),m);
    this.metersperpixel=metersperpixel;
  }

  public MapScale(double fact,Unit dispbase,Unit m) {
    this(new Unit(fact,dispbase),m);
    this.metersperpixel = -1;
  }

  public String toString() {
    return("disp = "+display+" map = "+map);
  }

  public double scale(Unit source) {
    return(display.size*map.toUnit(source,metersperpixel));
  }

  public Object clone() {
    return((Object)new MapScale(new Unit(display.size,display.base),map,metersperpixel));
  }

  public double toBase(Unit old) {
//    System.out.println("base = "+display.base+" old = "+old+" metersperpixel = "+metersperpixel);
    return(display.base.toUnit(old,metersperpixel));
  }

  public boolean equals(Object that) {
    return((that instanceof MapScale) &&
           (map==((MapScale)that).map) &&
           (display.base==((MapScale)that).display.base) &&
           (display.size==((MapScale)that).display.size));
  }

  public int compareTo(MapScale that) {
    double fact = (that.map.getRootSize()/
      (map.getRootSize()*display.toUnit(that.display,metersperpixel)));
    if (fact<1) return(-1);
    if (fact>1) return(1);
    return(0);
  }

}