home | career | drupal | java | mac | mysql | perl | scala | uml | unix  

jfreechart example source code file (RendererUtilities.java)

This example jfreechart source code file (RendererUtilities.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - jfreechart tags/keywords

illegalargumentexception, illegalargumentexception, null, null, rendererutilities, rendererutilities, requires, requires

The jfreechart RendererUtilities.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2009, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 *
 * 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 Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * ----------------------
 * RendererUtilities.java
 * ----------------------
 * (C) Copyright 2007-2009, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 19-Apr-2007 : Version 1 (DG);
 * 27-Mar-2009 : Fixed results for unsorted datasets (DG);
 *
 */

package org.jfree.chart.renderer;

import org.jfree.data.DomainOrder;
import org.jfree.data.xy.XYDataset;

/**
 * Utility methods related to the rendering process.
 *
 * @since 1.0.6
 */
public class RendererUtilities {

    /**
     * Finds the lower index of the range of live items in the specified data
     * series.
     *
     * @param dataset  the dataset (<code>null not permitted).
     * @param series  the series index.
     * @param xLow  the lowest x-value in the live range.
     * @param xHigh  the highest x-value in the live range.
     *
     * @return The index of the required item.
     *
     * @since 1.0.6
     *
     * @see #findLiveItemsUpperBound(XYDataset, int, double, double)
     */
    public static int findLiveItemsLowerBound(XYDataset dataset, int series,
            double xLow, double xHigh) {
        if (dataset == null) {
            throw new IllegalArgumentException("Null 'dataset' argument.");
        }
        if (xLow >= xHigh) {
            throw new IllegalArgumentException("Requires xLow < xHigh.");
        }
        int itemCount = dataset.getItemCount(series);
        if (itemCount <= 1) {
            return 0;
        }
        if (dataset.getDomainOrder() == DomainOrder.ASCENDING) {
            // for data in ascending order by x-value, we are (broadly) looking
            // for the index of the highest x-value that is less than xLow
            int low = 0;
            int high = itemCount - 1;
            double lowValue = dataset.getXValue(series, low);
            if (lowValue >= xLow) {
                // special case where the lowest x-value is >= xLow
                return low;
            }
            double highValue = dataset.getXValue(series, high);
            if (highValue < xLow) {
                // special case where the highest x-value is < xLow
                return high;
            }
            while (high - low > 1) {
                int mid = (low + high) / 2;
                double midV = dataset.getXValue(series, mid);
                if (midV >= xLow) {
                    high = mid;
                }
                else {
                    low = mid;
                }
            }
            return high;
        }
        else if (dataset.getDomainOrder() == DomainOrder.DESCENDING) {
            // when the x-values are sorted in descending order, the lower
            // bound is found by calculating relative to the xHigh value
            int low = 0;
            int high = itemCount - 1;
            double lowValue = dataset.getXValue(series, low);
            if (lowValue <= xHigh) {
                return low;
            }
            double highValue = dataset.getXValue(series, high);
            if (highValue > xHigh) {
                return high;
            }
            while (high - low > 1) {
                int mid = (low + high) / 2;
                double midV = dataset.getXValue(series, mid);
                if (midV > xHigh) {
                    low = mid;
                }
                else {
                    high = mid;
                }
                mid = (low + high) / 2;
            }
            return high;
        }
        else {
            // we don't know anything about the ordering of the x-values,
            // but we can still skip any initial values that fall outside the
            // range...
            int index = 0;
            // skip any items that don't need including...
            double x = dataset.getXValue(series, index);
            while (index < itemCount && (x < xLow || x > xHigh)) {
                index++;
                if (index < itemCount) {
                    x = dataset.getXValue(series, index);
                }
            }
            return Math.min(Math.max(0, index), itemCount - 1);
        }
    }

    /**
     * Finds the upper index of the range of live items in the specified data
     * series.
     *
     * @param dataset  the dataset (<code>null not permitted).
     * @param series  the series index.
     * @param xLow  the lowest x-value in the live range.
     * @param xHigh  the highest x-value in the live range.
     *
     * @return The index of the required item.
     *
     * @since 1.0.6
     *
     * @see #findLiveItemsLowerBound(XYDataset, int, double, double)
     */
    public static int findLiveItemsUpperBound(XYDataset dataset, int series,
            double xLow, double xHigh) {
        if (dataset == null) {
            throw new IllegalArgumentException("Null 'dataset' argument.");
        }
        if (xLow >= xHigh) {
            throw new IllegalArgumentException("Requires xLow < xHigh.");
        }
        int itemCount = dataset.getItemCount(series);
        if (itemCount <= 1) {
            return 0;
        }
        if (dataset.getDomainOrder() == DomainOrder.ASCENDING) {
            int low = 0;
            int high = itemCount - 1;
            double lowValue = dataset.getXValue(series, low);
            if (lowValue > xHigh) {
                return low;
            }
            double highValue = dataset.getXValue(series, high);
            if (highValue <= xHigh) {
                return high;
            }
            int mid = (low + high) / 2;
            while (high - low > 1) {
                double midV = dataset.getXValue(series, mid);
                if (midV <= xHigh) {
                    low = mid;
                }
                else {
                    high = mid;
                }
                mid = (low + high) / 2;
            }
            return mid;
        }
        else if (dataset.getDomainOrder() == DomainOrder.DESCENDING) {
            // when the x-values are descending, the upper bound is found by
            // comparing against xLow
            int low = 0;
            int high = itemCount - 1;
            int mid = (low + high) / 2;
            double lowValue = dataset.getXValue(series, low);
            if (lowValue < xLow) {
                return low;
            }
            double highValue = dataset.getXValue(series, high);
            if (highValue >= xLow) {
                return high;
            }
            while (high - low > 1) {
                double midV = dataset.getXValue(series, mid);
                if (midV >= xLow) {
                    low = mid;
                }
                else {
                    high = mid;
                }
                mid = (low + high) / 2;
            }
            return mid;
        }
        else {
            // we don't know anything about the ordering of the x-values,
            // but we can still skip any trailing values that fall outside the
            // range...
            int index = itemCount - 1;
            // skip any items that don't need including...
            double x = dataset.getXValue(series, index);
            while (index >= 0 && (x < xLow || x > xHigh)) {
                index--;
                if (index >= 0) {
                    x = dataset.getXValue(series, index);
                }
            }
            return Math.max(index, 0);
        }
    }

    /**
     * Finds a range of item indices that is guaranteed to contain all the
     * x-values from x0 to x1 (inclusive).
     *
     * @param dataset  the dataset (<code>null not permitted).
     * @param series  the series index.
     * @param xLow  the lower bound of the x-value range.
     * @param xHigh  the upper bound of the x-value range.
     *
     * @return The indices of the boundary items.
     */
    public static int[] findLiveItems(XYDataset dataset, int series,
            double xLow, double xHigh) {
        // here we could probably be a little faster by searching for both
        // indices simultaneously, but I'll look at that later if it seems
        // like it matters...
        int i0 = findLiveItemsLowerBound(dataset, series, xLow, xHigh);
        int i1 = findLiveItemsUpperBound(dataset, series, xLow, xHigh);
        if (i0 > i1) {
            i0 = i1;
        }
        return new int[] {i0, i1};
    }

}

Other jfreechart examples (source code examples)

Here is a short list of links related to this jfreechart RendererUtilities.java source code file:



my book on functional programming

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.