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jfreechart example source code file (XYSmoothLineAndShapeRenderer.java)

This example jfreechart source code file (XYSmoothLineAndShapeRenderer.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

a, awt, b, c, entitycollection, geometry, rectangle2d, rectangle2d, rectangleedge, rectangleedge, valueaxis, valueaxis, xydataset, xyplot, xyplot, xysmoothlineandshaperenderer

The jfreechart XYSmoothLineAndShapeRenderer.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2007, 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.]
 *
 * ---------------------------------
 * XYSmoothLineAndShapeRenderer.java
 * ---------------------------------
 * (C) Copyright 2007, by Object Refinery Limited and Contributors.
 *
 * Original Author:  -;
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 14-Jun-2007 : Version 1;
 *
 */

package org.jfree.experimental.chart.renderer.xy;

import java.awt.Graphics2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;

import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.plot.CrosshairState;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYItemRendererState;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.RectangleEdge;

/**
 * A line and shape renderer that performs line smoothing.  See
 * http://www.jfree.org/phpBB2/viewtopic.php?t=20671
 *
 * WARNING: THIS CLASS IS NOT PART OF THE STANDARD JFREECHART API AND IS
 * SUBJECT TO ALTERATION OR REMOVAL.  DO NOT RELY ON THIS CLASS FOR
 * PRODUCTION USE.  Please experiment with this code and provide feedback.
 */
public class XYSmoothLineAndShapeRenderer extends XYLineAndShapeRenderer {

    /**
     * Draws the item (first pass). This method draws the lines
     * connecting the items.
     *
     * @param g2  the graphics device.
     * @param state  the renderer state.
     * @param dataArea  the area within which the data is being drawn.
     * @param plot  the plot (can be used to obtain standard color
     *              information etc).
     * @param domainAxis  the domain axis.
     * @param rangeAxis  the range axis.
     * @param dataset  the dataset.
     * @param pass  the pass.
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     */
    protected void drawPrimaryLine(XYItemRendererState state, Graphics2D g2,
            XYPlot plot, XYDataset dataset, int pass, int series, int item,
            ValueAxis domainAxis, ValueAxis rangeAxis, Rectangle2D dataArea) {

        if (item == 0) {
            return;
        }

        // get the data point...
        double x1 = dataset.getXValue(series, item);
        double y1 = dataset.getYValue(series, item);
        if (Double.isNaN(y1) || Double.isNaN(x1)) {
            return;
        }

        double x0 = dataset.getXValue(series, item - 1);
        double y0 = dataset.getYValue(series, item - 1);
        if (Double.isNaN(y0) || Double.isNaN(x0)) {
            return;
        }

        RectangleEdge xAxisLocation = plot.getDomainAxisEdge();
        RectangleEdge yAxisLocation = plot.getRangeAxisEdge();

        double transX0 = domainAxis.valueToJava2D(x0, dataArea, xAxisLocation);
        double transY0 = rangeAxis.valueToJava2D(y0, dataArea, yAxisLocation);

        double transX1 = domainAxis.valueToJava2D(x1, dataArea, xAxisLocation);
        double transY1 = rangeAxis.valueToJava2D(y1, dataArea, yAxisLocation);

        // only draw if we have good values
        if (Double.isNaN(transX0) || Double.isNaN(transY0)
                || Double.isNaN(transX1) || Double.isNaN(transY1)) {
            return;
        }

        Point2D.Double point0 = new Point2D.Double();
        Point2D.Double point1 = new Point2D.Double();
        Point2D.Double point2 = new Point2D.Double();
        Point2D.Double point3 = new Point2D.Double();

        if (item == 1) {
            point0 = null;
        }
        else {
            point0.x = domainAxis.valueToJava2D(dataset.getXValue(series,
                    item - 2), dataArea, xAxisLocation);
            point0.y = rangeAxis.valueToJava2D(dataset.getYValue(series,
                    item - 2), dataArea, yAxisLocation);
        }

        point1.x = transX0;
        point1.y = transY0;

        point2.x = transX1;
        point2.y = transY1;

        if ((item + 1) == dataset.getItemCount(series)) {
            point3 = null;
        }
        else {
            point3.x = domainAxis.valueToJava2D(dataset.getXValue(series,
                    item + 1), dataArea, xAxisLocation);
            point3.y = rangeAxis.valueToJava2D(dataset.getYValue(series,
                    item + 1), dataArea, yAxisLocation);
        }

        int steps = ((int) ((point2.x - point1.x) / 0.2) < 30)
                ? (int) ((point2.x - point1.x) / 0.2) : 30;

        Point2D.Double[] points = getBezierCurve(point0, point1, point2,
                point3, 1, steps);

        for (int i = 1; i < points.length; i++) {
            transX0 = points[i - 1].x;
            transY0 = points[i - 1].y;
            transX1 = points[i].x;
            transY1 = points[i].y;

            PlotOrientation orientation = plot.getOrientation();
            if (orientation == PlotOrientation.HORIZONTAL) {
                state.workingLine.setLine(transY0, transX0, transY1, transX1);
            }
            else if (orientation == PlotOrientation.VERTICAL) {
                state.workingLine.setLine(transX0, transY0, transX1, transY1);
            }

            if (state.workingLine.intersects(dataArea)) {
                drawFirstPassShape(g2, pass, series, item, state.workingLine);
            }
        }
    }

    /**
     * Draws the item shapes and adds chart entities (second pass). This method
     * draws the shapes which mark the item positions. If <code>entities
     * is not <code>null it will be populated with entity information
     * for points that fall within the data area.
     *
     * @param g2  the graphics device.
     * @param plot  the plot (can be used to obtain standard color
     *              information etc).
     * @param domainAxis  the domain axis.
     * @param dataArea  the area within which the data is being drawn.
     * @param rangeAxis  the range axis.
     * @param dataset  the dataset.
     * @param pass  the pass.
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     * @param crosshairState  the crosshair state.
     * @param entities the entity collection.
     */
    protected void drawSecondaryPass(Graphics2D g2, XYPlot plot,
            XYDataset dataset, int pass, int series, int item,
            ValueAxis domainAxis, Rectangle2D dataArea,
            ValueAxis rangeAxis, CrosshairState crosshairState,
            EntityCollection entities) {
        // super.drawSecondaryPass(g2, plot, dataset, pass, series, item,
        // domainAxis, dataArea, rangeAxis, crosshairState, entities);
    }

    /**
     * Updates the control points.
     *
     * @param point0
     * @param point1
     * @param point2
     * @param point3
     * @param control1
     * @param control2
     * @param smooth
     */
    public static void getControlPoints(Point2D.Double point0,
            Point2D.Double point1, Point2D.Double point2,
            Point2D.Double point3, Point2D.Double control1,
            Point2D.Double control2, double smooth) {

        // Reference: http://www.antigrain.com/research/bezier_interpolation/

        if (point0 == null) point0 = point1; //new Point2D.Double(0, 0);
        if (point3 == null) point3 = point2; //new Point2D.Double(0, 0);

        Point2D.Double c1 = new Point2D.Double(
               (point0.x + point1.x) / 2.0, (point0.y + point1.y) / 2.0);
        Point2D.Double c2 = new Point2D.Double(
               (point1.x + point2.x) / 2.0, (point1.y + point2.y) / 2.0);
        Point2D.Double c3 = new Point2D.Double(
               (point2.x + point3.x) / 2.0, (point2.y + point3.y) / 2.0);

        double len1 = point1.distance(point0);
        double len2 = point2.distance(point1);
        double len3 = point3.distance(point2);

        double k1 = len1 / (len1 + len2);
        double k2 = len2 / (len2 + len3);

        Point2D.Double m1 = new Point2D.Double(
               c1.x + (c2.x - c1.x) * k1, c1.y + (c2.y - c1.y) * k1);
        Point2D.Double m2 = new Point2D.Double(
               c2.x + (c3.x - c2.x) * k2, c2.y + (c3.y - c2.y) * k2);

        control1.setLocation(new Point2D.Double(
               m1.x + (c2.x - m1.x) * smooth + point1.x - m1.x,
               m1.y + (c2.y - m1.y) * smooth + point1.y - m1.y));
        control2.setLocation(new Point2D.Double(
               m2.x + (c2.x - m2.x) * smooth + point2.x - m2.x,
               m2.y + (c2.y - m2.y) * smooth + point2.y - m2.y));
    }

    /**
     * Returns the points for a bezier curve.
     *
     * @param point0
     * @param point1
     * @param point2
     * @param point3
     * @param smooth
     * @param steps
     *
     * @return The curve points.
     */
    public static Point2D.Double[] getBezierCurve(Point2D.Double point0,
            Point2D.Double point1, Point2D.Double point2,
            Point2D.Double point3, double smooth, int steps) {
        Point2D.Double control1 = new Point2D.Double();
        Point2D.Double control2 = new Point2D.Double();

        getControlPoints(point0, point1, point2, point3, control1, control2,
                smooth);

        Point2D.Double C = new Point2D.Double(
               3 * (control1.x - point1.x), 3 * (control1.y - point1.y));
        Point2D.Double B = new Point2D.Double(3 * (control2.x - control1.x)
                - C.x, 3 * (control2.y - control1.y) - C.y);
        Point2D.Double A = new Point2D.Double(point2.x - point1.x - C.x - B.x,
                point2.y - point1.y - C.y - B.y);

        Point2D.Double[] res = new Point2D.Double[steps + 1];
        double stepSize = 1.0 / steps;
        double step = stepSize;

        res[0] = point1;
        for (int i = 1; i < steps; i++) {
            res[i] = new Point2D.Double(A.x * Math.pow(step, 3) + B.x
                    * Math.pow(step, 2) + C.x * step + point1.x, A.y
                    * Math.pow(step, 3) + B.y * Math.pow(step, 2) + C.y * step
                    + point1.y);
            //System.out.println(step + " : " + res[i]);
            step += stepSize;
        }
        res[steps] = point2;

        return res;
    }

}

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