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jfreechart example source code file (CyclicXYItemRenderer.java)

This example jfreechart source code file (CyclicXYItemRenderer.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

awt, cyclicnumberaxis, cyclicnumberaxis, cyclicxyitemrenderer, cyclicxyitemrenderer, double, geometry, io, number, number, overwritedataset, overwritedataset, serializable, valueaxis, xydataset, xyitemrendererstate, xytooltipgenerator

The jfreechart CyclicXYItemRenderer.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2008, 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.]
 *
 * ---------------------------
 * CyclicXYItemRenderer.java
 * ---------------------------
 * (C) Copyright 2003-2008, by Nicolas Brodu and Contributors.
 *
 * Original Author:  Nicolas Brodu;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * Changes
 * -------
 * 19-Nov-2003 : Initial import to JFreeChart from the JSynoptic project (NB);
 * 23-Dec-2003 : Added missing Javadocs (DG);
 * 25-Feb-2004 : Replaced CrosshairInfo with CrosshairState (DG);
 * 15-Jul-2004 : Switched getX() with getXValue() and getY() with
 *               getYValue() (DG);
 * ------------- JFREECHART 1.0.0 ---------------------------------------------
 * 06-Jul-2006 : Modified to call only dataset methods that return double
 *               primitives (DG);
 *
 */

package org.jfree.chart.renderer.xy;

import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;

import org.jfree.chart.axis.CyclicNumberAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.labels.XYToolTipGenerator;
import org.jfree.chart.plot.CrosshairState;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.urls.XYURLGenerator;
import org.jfree.data.DomainOrder;
import org.jfree.data.general.DatasetChangeListener;
import org.jfree.data.general.DatasetGroup;
import org.jfree.data.xy.XYDataset;

/**
 * The Cyclic XY item renderer is specially designed to handle cyclic axis.
 * While the standard renderer would draw a line across the plot when a cycling
 * occurs, the cyclic renderer splits the line at each cycle end instead. This
 * is done by interpolating new points at cycle boundary. Thus, correct
 * appearance is restored.
 *
 * The Cyclic XY item renderer works exactly like a standard XY item renderer
 * with non-cyclic axis.
 */
public class CyclicXYItemRenderer extends StandardXYItemRenderer
                                  implements Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 4035912243303764892L;

    /**
     * Default constructor.
     */
    public CyclicXYItemRenderer() {
        super();
    }

    /**
     * Creates a new renderer.
     *
     * @param type  the renderer type.
     */
    public CyclicXYItemRenderer(int type) {
        super(type);
    }

    /**
     * Creates a new renderer.
     *
     * @param type  the renderer type.
     * @param labelGenerator  the tooltip generator.
     */
    public CyclicXYItemRenderer(int type, XYToolTipGenerator labelGenerator) {
        super(type, labelGenerator);
    }

    /**
     * Creates a new renderer.
     *
     * @param type  the renderer type.
     * @param labelGenerator  the tooltip generator.
     * @param urlGenerator  the url generator.
     */
    public CyclicXYItemRenderer(int type,
                                XYToolTipGenerator labelGenerator,
                                XYURLGenerator urlGenerator) {
        super(type, labelGenerator, urlGenerator);
    }


    /**
     * Draws the visual representation of a single data item.
     * When using cyclic axis, do not draw a line from right to left when
     * cycling as would a standard XY item renderer, but instead draw a line
     * from the previous point to the cycle bound in the last cycle, and a line
     * from the cycle bound to current point in the current cycle.
     *
     * @param g2  the graphics device.
     * @param state  the renderer state.
     * @param dataArea  the data area.
     * @param info  the plot rendering info.
     * @param plot  the plot.
     * @param domainAxis  the domain axis.
     * @param rangeAxis  the range axis.
     * @param dataset  the dataset.
     * @param series  the series index.
     * @param item  the item index.
     * @param crosshairState  crosshair information for the plot
     *                        (<code>null permitted).
     * @param pass  the current pass index.
     */
    public void drawItem(Graphics2D g2,
                         XYItemRendererState state,
                         Rectangle2D dataArea,
                         PlotRenderingInfo info,
                         XYPlot plot,
                         ValueAxis domainAxis,
                         ValueAxis rangeAxis,
                         XYDataset dataset,
                         int series,
                         int item,
                         CrosshairState crosshairState,
                         int pass) {

        if ((!getPlotLines()) || ((!(domainAxis instanceof CyclicNumberAxis))
                && (!(rangeAxis instanceof CyclicNumberAxis))) || (item <= 0)) {
            super.drawItem(g2, state, dataArea, info, plot, domainAxis,
                    rangeAxis, dataset, series, item, crosshairState, pass);
            return;
        }

        // get the previous data point...
        double xn = dataset.getXValue(series, item - 1);
        double yn = dataset.getYValue(series, item - 1);
        // If null, don't draw line => then delegate to parent
        if (Double.isNaN(yn)) {
            super.drawItem(g2, state, dataArea, info, plot, domainAxis,
                    rangeAxis, dataset, series, item, crosshairState, pass);
            return;
        }
        double[] x = new double[2];
        double[] y = new double[2];
        x[0] = xn;
        y[0] = yn;

        // get the data point...
        xn = dataset.getXValue(series, item);
        yn = dataset.getYValue(series, item);
        // If null, don't draw line at all
        if (Double.isNaN(yn)) {
            return;
        }
        x[1] = xn;
        y[1] = yn;

        // Now split the segment as needed
        double xcycleBound = Double.NaN;
        double ycycleBound = Double.NaN;
        boolean xBoundMapping = false, yBoundMapping = false;
        CyclicNumberAxis cnax = null, cnay = null;

        if (domainAxis instanceof CyclicNumberAxis) {
            cnax = (CyclicNumberAxis) domainAxis;
            xcycleBound = cnax.getCycleBound();
            xBoundMapping = cnax.isBoundMappedToLastCycle();
            // If the segment must be splitted, insert a new point
            // Strict test forces to have real segments (not 2 equal points)
            // and avoids division by 0
            if ((x[0] != x[1])
                    && ((xcycleBound >= x[0])
                    && (xcycleBound <= x[1])
                    || (xcycleBound >= x[1])
                    && (xcycleBound <= x[0]))) {
                double[] nx = new double[3];
                double[] ny = new double[3];
                nx[0] = x[0]; nx[2] = x[1]; ny[0] = y[0]; ny[2] = y[1];
                nx[1] = xcycleBound;
                ny[1] = (y[1] - y[0]) * (xcycleBound - x[0])
                        / (x[1] - x[0]) + y[0];
                x = nx; y = ny;
            }
        }

        if (rangeAxis instanceof CyclicNumberAxis) {
            cnay = (CyclicNumberAxis) rangeAxis;
            ycycleBound = cnay.getCycleBound();
            yBoundMapping = cnay.isBoundMappedToLastCycle();
            // The split may occur in either x splitted segments, if any, but
            // not in both
            if ((y[0] != y[1]) && ((ycycleBound >= y[0])
                    && (ycycleBound <= y[1])
                    || (ycycleBound >= y[1]) && (ycycleBound <= y[0]))) {
                double[] nx = new double[x.length + 1];
                double[] ny = new double[y.length + 1];
                nx[0] = x[0]; nx[2] = x[1]; ny[0] = y[0]; ny[2] = y[1];
                ny[1] = ycycleBound;
                nx[1] = (x[1] - x[0]) * (ycycleBound - y[0])
                        / (y[1] - y[0]) + x[0];
                if (x.length == 3) {
                    nx[3] = x[2]; ny[3] = y[2];
                }
                x = nx; y = ny;
            }
            else if ((x.length == 3) && (y[1] != y[2]) && ((ycycleBound >= y[1])
                    && (ycycleBound <= y[2])
                    || (ycycleBound >= y[2]) && (ycycleBound <= y[1]))) {
                double[] nx = new double[4];
                double[] ny = new double[4];
                nx[0] = x[0]; nx[1] = x[1]; nx[3] = x[2];
                ny[0] = y[0]; ny[1] = y[1]; ny[3] = y[2];
                ny[2] = ycycleBound;
                nx[2] = (x[2] - x[1]) * (ycycleBound - y[1])
                        / (y[2] - y[1]) + x[1];
                x = nx; y = ny;
            }
        }

        // If the line is not wrapping, then parent is OK
        if (x.length == 2) {
            super.drawItem(g2, state, dataArea, info, plot, domainAxis,
                    rangeAxis, dataset, series, item, crosshairState, pass);
            return;
        }

        OverwriteDataSet newset = new OverwriteDataSet(x, y, dataset);

        if (cnax != null) {
            if (xcycleBound == x[0]) {
                cnax.setBoundMappedToLastCycle(x[1] <= xcycleBound);
            }
            if (xcycleBound == x[1]) {
                cnax.setBoundMappedToLastCycle(x[0] <= xcycleBound);
            }
        }
        if (cnay != null) {
            if (ycycleBound == y[0]) {
                cnay.setBoundMappedToLastCycle(y[1] <= ycycleBound);
            }
            if (ycycleBound == y[1]) {
                cnay.setBoundMappedToLastCycle(y[0] <= ycycleBound);
            }
        }
        super.drawItem(
            g2, state, dataArea, info, plot, domainAxis, rangeAxis,
            newset, series, 1, crosshairState, pass
        );

        if (cnax != null) {
            if (xcycleBound == x[1]) {
                cnax.setBoundMappedToLastCycle(x[2] <= xcycleBound);
            }
            if (xcycleBound == x[2]) {
                cnax.setBoundMappedToLastCycle(x[1] <= xcycleBound);
            }
        }
        if (cnay != null) {
            if (ycycleBound == y[1]) {
                cnay.setBoundMappedToLastCycle(y[2] <= ycycleBound);
            }
            if (ycycleBound == y[2]) {
                cnay.setBoundMappedToLastCycle(y[1] <= ycycleBound);
            }
        }
        super.drawItem(g2, state, dataArea, info, plot, domainAxis, rangeAxis,
                newset, series, 2, crosshairState, pass);

        if (x.length == 4) {
            if (cnax != null) {
                if (xcycleBound == x[2]) {
                    cnax.setBoundMappedToLastCycle(x[3] <= xcycleBound);
                }
                if (xcycleBound == x[3]) {
                    cnax.setBoundMappedToLastCycle(x[2] <= xcycleBound);
                }
            }
            if (cnay != null) {
                if (ycycleBound == y[2]) {
                    cnay.setBoundMappedToLastCycle(y[3] <= ycycleBound);
                }
                if (ycycleBound == y[3]) {
                    cnay.setBoundMappedToLastCycle(y[2] <= ycycleBound);
                }
            }
            super.drawItem(g2, state, dataArea, info, plot, domainAxis,
                    rangeAxis, newset, series, 3, crosshairState, pass);
        }

        if (cnax != null) {
            cnax.setBoundMappedToLastCycle(xBoundMapping);
        }
        if (cnay != null) {
            cnay.setBoundMappedToLastCycle(yBoundMapping);
        }
    }

    /**
     * A dataset to hold the interpolated points when drawing new lines.
     */
    protected static class OverwriteDataSet implements XYDataset {

        /** The delegate dataset. */
        protected XYDataset delegateSet;

        /** Storage for the x and y values. */
        Double[] x, y;

        /**
         * Creates a new dataset.
         *
         * @param x  the x values.
         * @param y  the y values.
         * @param delegateSet  the dataset.
         */
        public OverwriteDataSet(double [] x, double[] y,
                                XYDataset delegateSet) {
            this.delegateSet = delegateSet;
            this.x = new Double[x.length]; this.y = new Double[y.length];
            for (int i = 0; i < x.length; ++i) {
                this.x[i] = new Double(x[i]);
                this.y[i] = new Double(y[i]);
            }
        }

        /**
         * Returns the order of the domain (X) values.
         *
         * @return The domain order.
         */
        public DomainOrder getDomainOrder() {
            return DomainOrder.NONE;
        }

        /**
         * Returns the number of items for the given series.
         *
         * @param series  the series index (zero-based).
         *
         * @return The item count.
         */
        public int getItemCount(int series) {
            return this.x.length;
        }

        /**
         * Returns the x-value.
         *
         * @param series  the series index (zero-based).
         * @param item  the item index (zero-based).
         *
         * @return The x-value.
         */
        public Number getX(int series, int item) {
            return this.x[item];
        }

        /**
         * Returns the x-value (as a double primitive) for an item within a
         * series.
         *
         * @param series  the series (zero-based index).
         * @param item  the item (zero-based index).
         *
         * @return The x-value.
         */
        public double getXValue(int series, int item) {
            double result = Double.NaN;
            Number x = getX(series, item);
            if (x != null) {
                result = x.doubleValue();
            }
            return result;
        }

        /**
         * Returns the y-value.
         *
         * @param series  the series index (zero-based).
         * @param item  the item index (zero-based).
         *
         * @return The y-value.
         */
        public Number getY(int series, int item) {
            return this.y[item];
        }

        /**
         * Returns the y-value (as a double primitive) for an item within a
         * series.
         *
         * @param series  the series (zero-based index).
         * @param item  the item (zero-based index).
         *
         * @return The y-value.
         */
        public double getYValue(int series, int item) {
            double result = Double.NaN;
            Number y = getY(series, item);
            if (y != null) {
                result = y.doubleValue();
            }
            return result;
        }

        /**
         * Returns the number of series in the dataset.
         *
         * @return The series count.
         */
        public int getSeriesCount() {
            return this.delegateSet.getSeriesCount();
        }

        /**
         * Returns the name of the given series.
         *
         * @param series  the series index (zero-based).
         *
         * @return The series name.
         */
        public Comparable getSeriesKey(int series) {
            return this.delegateSet.getSeriesKey(series);
        }

        /**
         * Returns the index of the named series, or -1.
         *
         * @param seriesName  the series name.
         *
         * @return The index.
         */
        public int indexOf(Comparable seriesName) {
            return this.delegateSet.indexOf(seriesName);
        }

        /**
         * Does nothing.
         *
         * @param listener  ignored.
         */
        public void addChangeListener(DatasetChangeListener listener) {
            // unused in parent
        }

        /**
         * Does nothing.
         *
         * @param listener  ignored.
         */
        public void removeChangeListener(DatasetChangeListener listener) {
            // unused in parent
        }

        /**
         * Returns the dataset group.
         *
         * @return The dataset group.
         */
        public DatasetGroup getGroup() {
            // unused but must return something, so while we are at it...
            return this.delegateSet.getGroup();
        }

        /**
         * Does nothing.
         *
         * @param group  ignored.
         */
        public void setGroup(DatasetGroup group) {
            // unused in parent
        }

    }

}


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