GraphScale.java

package com.spun.util.images;

import java.util.Date;

import com.spun.util.logger.SimpleLogger;

/**
  * An Interface for graphic objects
  **/
public class GraphScale
{
  public static final double VALUE_UNITS[]  = {0.01, 0.05, 0.10, 0.25, 0.5, 1, 2, 5, 10, 20, 100, 200, 1000};
  private double             minValue       = 0.0;
  private double             maxValue       = 0.0;
  private double             valueUnit      = 0.0;
  private int                valueUnitCount = 0;
  /***********************************************************************/
  /**
    * 
    **/
  public GraphScale(Date minDate, Date maxDate, double minValue, double maxValue)
  {
    setValueUnits(minValue, maxValue);
  }
  /***********************************************************************/
  private void setValueUnits(double minValue, double maxValue)
  {
    double range = maxValue - minValue;
    double unit = .01;
    double unitCount = range / .01;
    for (int i = 0; i < VALUE_UNITS.length; i++)
    {
      double tempCount = (range / VALUE_UNITS[i]);
      if (tempCount >= 4)
      {
        if (tempCount < unitCount)
        {
          unitCount = tempCount;
          unit = VALUE_UNITS[i];
        }
      }
    }
    this.valueUnit = unit;
    this.minValue = minValue - (minValue % unit);
    this.maxValue = maxValue + unit - (maxValue % unit);
    this.valueUnitCount = (int) Math.round((maxValue - minValue) / unit);
  }
  /***********************************************************************/
  /**
    *
    **/
  public String toString()
  {
    String text = "GraphScale [" + minValue + "-" + maxValue + "(" + valueUnit + "*" + valueUnitCount + "]";
    return text;
  }
  /***********************************************************************/
  public static void main(String args[])
  {
    SimpleLogger.variable(new GraphScale(null, null, 8, 15).toString());
  }
  /***********************************************************************/
  /***********************************************************************/
}