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JChart2D is an easy to use component for displaying two- dimensional traces in a coordinate system written in Java.
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/*
 *  AAxisInverse.java of project jchart2d, 
 *  an IAxis implementations that inverts the values and shows 
 *  decreasing values (10, 9,... 1).  
 *  Copyright (c) 2007 - 2011 Achim Westermann, created on 20:33:13.
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *  
 *  If you modify or optimize the code in a useful way please let me know.
 *  [email protected]
 *
 */
package info.monitorenter.gui.chart.axis;

import info.monitorenter.gui.chart.Chart2D;
import info.monitorenter.gui.chart.IAxis;
import info.monitorenter.gui.chart.IAxisLabelFormatter;
import info.monitorenter.gui.chart.IAxisScalePolicy;
import info.monitorenter.gui.chart.ITrace2D;
import info.monitorenter.gui.chart.ITracePoint2D;
import info.monitorenter.gui.chart.LabeledValue;
import info.monitorenter.util.Range;
import info.monitorenter.util.math.MathUtil;

import java.awt.Graphics;
import java.util.Iterator;
import java.util.List;

/**
 * An {@link AAxis} with inverse display of values.
 * 
 * 
 * Labels and values are starting from the highest value and go down to the
 * lowest one.
 * 

 * 
 * @param 
 *          Subtypes may be more picky which scale policies the accept to
 *          disallow incorrect scales: This supports it (see
 *          {@link IAxis#setAxisScalePolicy(IAxisScalePolicy)}).  
 *           
 * @author Andrea Plotegher (initial contribution)
 * 
 * @author Achim Westermann
 *         (adaption for core)
 * 
 * @version $Revision: 1.20 $
 */

public class AxisInverse extends AAxis {

  /**
   * 
   * An accessor for the x axis of a chart.
   * 
   * 
   * @author  getScaleValues(Graphics g2d, IAxis axis) {

        List ret = axisScalePolicy.getScaleValues(g2d, axis);
        for (LabeledValue label : ret) {
          label.setValue(1.0 - label.getValue());
        }
        return ret;
      }
    });
  }

  /**
   * @see info.monitorenter.gui.chart.IAxis#getScaledValue(double)
   */
  public double getScaledValue(final double absolute) {
    Range range = this.getRange();
    double scalerX = range.getExtent();
    double result = 1 - ((absolute - range.getMin()) / scalerX);
    if (!MathUtil.isDouble(result)) {
      result = 0;
    }
    return result;
  }
}