/*
 *
 * This software is provided by NOAA for full, free and open release.  It is
 * understood by the recipient/user that NOAA assumes no liability for any
 * errors contained in the code.  Although this software is released without
 * conditions or restrictions in its use, it is expected that appropriate
 * credit be given to its author and to the National Oceanic and Atmospheric
 * Administration should the software be included by the recipient as an
 * element in other product development.
 */
// RCS $Id: LogTransform.java,v 1.8 2003/08/22 23:02:32 dwd Exp $
package  sgtplot;

import sgtplot.util.GeoDate;
import sgtplot.util.Range2D;
import sgtplot.util.SoTRange;
import sgtplot.util.SoTValue;
import sgtplot.util.TimeRange;
import java.lang.Math;


/**
 * Transform class for creation of "log" axes. An {@link sgtplot.demo.JLogLogDemo
 * example} is available demonstrating LogTransform use.
 *
 *--------------------------------------------------------------------------

 * NAME : LogTransform.java

 * FUNCTION : Performs a logarithm transform on a cartesian axis.

 * ORIGIN  : GFI INFORMATIQUE

 * PROJECT : SONC DPS

 * -------------------------------------------------------------------------

 * HISTORY

 * VERSION : 03/07/2002 LBE

 *        old version had no fonctionality. It was just written

 *        for future evolutions. This new version complete the class

 * END-HISTORY

 * ------------------------------------------------------------------------

 * @author Donald Denbo
 * @version $Revision: 1.8 $, $Date: 2003/08/22 23:02:32 $
 * @since 3.0
 */
public class LogTransform extends AxisTransform implements Cloneable {
  double at_;
  double bt_;
  double a_;
  double b_;
  int min_=-50;

  public LogTransform() {
    super();
  }
  public LogTransform(double p1,double p2,double u1,double u2){
    super(p1, p2, u1, u2);
  }
  public LogTransform(Range2D pr,Range2D ur){
    super(pr, ur);
  }
  public LogTransform(double p1,double p2,GeoDate t1,GeoDate t2){
    super(p1, p2, t1, t2);
  }
  public LogTransform(Range2D pr,TimeRange tr) {
    super(pr, tr);
  }
  public LogTransform(Range2D pr, SoTRange str){
    super(pr, str);
  }

  AxisTransform copy() {
    LogTransform newTransform;
    try {
      newTransform = (LogTransform)clone();
    } catch (CloneNotSupportedException e) {
      newTransform = new LogTransform();
    }
    return (AxisTransform)newTransform;
  }

  public double getTransP(double u) {
      try {
        if(u1_<=0 || u2_<=0) {
          //System.out.println("ERROR Negative LOG");
          throw new NegativeLogException("Can't Log negative values");
        }
      }catch(NegativeLogException e){e.printStackTrace();}
    return a_*(Math.log(u)/Math.log(10)) + b_;
  }
  public double getTransP(GeoDate t) {
    throw new MethodNotImplementedError();
  }
  public double getTransP(long t) {
    throw new MethodNotImplementedError();
  }
  public double getTransP(SoTValue v) {
    if(v.isTime()) {
        throw new MethodNotImplementedError();
    } else {
      double u = ((SoTValue.Double)v).getValue();
      try { //
        if(u<=0) throw new NegativeLogException("Can't Log negative values");
      }catch(NegativeLogException e){e.printStackTrace();}
      return a_*(Math.log(u)/Math.log(10)) + b_;
    }
  }

  public double getTransU(double p) {
    if((p-b_)/a_