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jfreechart example source code file (CrosshairOverlay.java)

This example jfreechart source code file (CrosshairOverlay.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, bean, crosshair, crosshair, crosshairoverlay, crosshairoverlay, geometry, illegalargumentexception, io, javabean, list, list, null, point2d, rectangle2d, rectangleanchor, rectangleanchor, shape, textanchor, util

The jfreechart CrosshairOverlay.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.]
 *
 * ---------------------
 * CrosshairOverlay.java
 * ---------------------
 * (C) Copyright 2009, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes:
 * --------
 * 09-Apr-2009 : Version 1 (DG);
 *
 */

package org.jfree.chart.panel;

import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Rectangle;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.Crosshair;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.text.TextUtilities;
import org.jfree.ui.RectangleAnchor;
import org.jfree.ui.RectangleEdge;
import org.jfree.ui.TextAnchor;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PublicCloneable;

/**
 * An overlay for a {@link ChartPanel} that draws crosshairs on a plot.
 *
 * @since 1.0.13
 */
public class CrosshairOverlay extends AbstractOverlay implements Overlay,
        PropertyChangeListener, PublicCloneable, Cloneable, Serializable {

    /** Storage for the crosshairs along the x-axis. */
    private List xCrosshairs;

    /** Storage for the crosshairs along the y-axis. */
    private List yCrosshairs;

    /**
     * Default constructor.
     */
    public CrosshairOverlay() {
        super();
        this.xCrosshairs = new java.util.ArrayList();
        this.yCrosshairs = new java.util.ArrayList();
    }

    /**
     * Adds a crosshair against the domain axis.
     *
     * @param crosshair  the crosshair.
     */
    public void addDomainCrosshair(Crosshair crosshair) {
        if (crosshair == null) {
            throw new IllegalArgumentException("Null 'crosshair' argument.");
        }
        this.xCrosshairs.add(crosshair);
        crosshair.addPropertyChangeListener(this);
    }

    public void removeDomainCrosshair(Crosshair crosshair) {
        if (crosshair == null) {
            throw new IllegalArgumentException("Null 'crosshair' argument.");
        }
        if (this.xCrosshairs.remove(crosshair)) {
            crosshair.removePropertyChangeListener(this);
            fireOverlayChanged();
        }
    }

    public void clearDomainCrosshairs() {
        if (this.xCrosshairs.isEmpty()) {
            return;  // nothing to do
        }
        List crosshairs = getDomainCrosshairs();
        for (int i = 0; i < crosshairs.size(); i++) {
            Crosshair c = (Crosshair) crosshairs.get(i);
            this.xCrosshairs.remove(c);
            c.removePropertyChangeListener(this);
        }
        fireOverlayChanged();
    }
    
    public List getDomainCrosshairs() {
        return new ArrayList(this.xCrosshairs);
    }

    /**
     * Adds a crosshair against the range axis.
     *
     * @param crosshair  the crosshair.
     */
    public void addRangeCrosshair(Crosshair crosshair) {
        if (crosshair == null) {
            throw new IllegalArgumentException("Null 'crosshair' argument.");
        }
        this.yCrosshairs.add(crosshair);
        crosshair.addPropertyChangeListener(this);
    }

    public void removeRangeCrosshair(Crosshair crosshair) {
        if (crosshair == null) {
            throw new IllegalArgumentException("Null 'crosshair' argument.");
        }
        if (this.yCrosshairs.remove(crosshair)) {
            crosshair.removePropertyChangeListener(this);
            fireOverlayChanged();
        }
    }

    public void clearRangeCrosshairs() {
        if (this.yCrosshairs.isEmpty()) {
            return;  // nothing to do
        }
        List crosshairs = getRangeCrosshairs();
        for (int i = 0; i < crosshairs.size(); i++) {
            Crosshair c = (Crosshair) crosshairs.get(i);
            this.yCrosshairs.remove(c);
            c.removePropertyChangeListener(this);
        }
        fireOverlayChanged();
    }

    public List getRangeCrosshairs() {
        return new ArrayList(this.yCrosshairs);
    }

    /**
     * Receives a property change event (typically a change in one of the
     * crosshairs).
     *
     * @param e  the event.
     */
    public void propertyChange(PropertyChangeEvent e) {
        fireOverlayChanged();
    }

    /**
     * Paints the crosshairs in the layer.
     *
     * @param g2  the graphics target.
     * @param chartPanel  the chart panel.
     */
    public void paintOverlay(Graphics2D g2, ChartPanel chartPanel) {
        Shape savedClip = g2.getClip();
        Rectangle2D dataArea = chartPanel.getScreenDataArea();
        g2.clip(dataArea);
        JFreeChart chart = chartPanel.getChart();
        XYPlot plot = (XYPlot) chart.getPlot();
        ValueAxis xAxis = plot.getDomainAxis();
        RectangleEdge xAxisEdge = plot.getDomainAxisEdge();
        Iterator iterator = this.xCrosshairs.iterator();
        while (iterator.hasNext()) {
            Crosshair ch = (Crosshair) iterator.next();
            if (ch.isVisible()) {
                double x = ch.getValue();
                double xx = xAxis.valueToJava2D(x, dataArea, xAxisEdge);
                if (plot.getOrientation() == PlotOrientation.VERTICAL) {
                    drawVerticalCrosshair(g2, dataArea, xx, ch);
                }
                else {
                    drawHorizontalCrosshair(g2, dataArea, xx, ch);
                }
            }
        }
        ValueAxis yAxis = plot.getRangeAxis();
        RectangleEdge yAxisEdge = plot.getRangeAxisEdge();
        iterator = this.yCrosshairs.iterator();
        while (iterator.hasNext()) {
            Crosshair ch = (Crosshair) iterator.next();
            if (ch.isVisible()) {
                double y = ch.getValue();
                double yy = yAxis.valueToJava2D(y, dataArea, yAxisEdge);
                if (plot.getOrientation() == PlotOrientation.VERTICAL) {
                    drawHorizontalCrosshair(g2, dataArea, yy, ch);
                }
                else {
                    drawVerticalCrosshair(g2, dataArea, yy, ch);
                }
            }
        }
        g2.setClip(savedClip);
    }

    /**
     * Draws a crosshair horizontally across the plot.
     *
     * @param g2  the graphics target.
     * @param dataArea  the data area.
     * @param y  the y-value in Java2D space.
     * @param crosshair  the crosshair.
     */
    protected void drawHorizontalCrosshair(Graphics2D g2, Rectangle2D dataArea,
            double y, Crosshair crosshair) {

        if (y >= dataArea.getMinY() && y <= dataArea.getMaxY()) {
            Line2D line = new Line2D.Double(dataArea.getMinX(), y,
                    dataArea.getMaxX(), y);
            Paint savedPaint = g2.getPaint();
            Stroke savedStroke = g2.getStroke();
            g2.setPaint(crosshair.getPaint());
            g2.setStroke(crosshair.getStroke());
            g2.draw(line);
            if (crosshair.isLabelVisible()) {
                String label = crosshair.getLabelGenerator().generateLabel(
                        crosshair);
                RectangleAnchor anchor = crosshair.getLabelAnchor();
                Point2D pt = calculateLabelPoint(line, anchor, 5, 5);
                float xx = (float) pt.getX();
                float yy = (float) pt.getY();
                TextAnchor alignPt = textAlignPtForLabelAnchorH(anchor);
                Shape hotspot = TextUtilities.calculateRotatedStringBounds(
                        label, g2, xx, yy, alignPt, 0.0, TextAnchor.CENTER);
                if (!dataArea.contains(hotspot.getBounds2D())) {
                    anchor = flipAnchorV(anchor);
                    pt = calculateLabelPoint(line, anchor, 5, 5);
                    xx = (float) pt.getX();
                    yy = (float) pt.getY();
                    alignPt = textAlignPtForLabelAnchorH(anchor);
                    hotspot = TextUtilities.calculateRotatedStringBounds(
                           label, g2, xx, yy, alignPt, 0.0, TextAnchor.CENTER);
                }

                g2.setPaint(crosshair.getLabelBackgroundPaint());
                g2.fill(hotspot);
                g2.setPaint(crosshair.getLabelOutlinePaint());
                g2.draw(hotspot);
                TextUtilities.drawAlignedString(label, g2, xx, yy, alignPt);
            }
            g2.setPaint(savedPaint);
            g2.setStroke(savedStroke);
        }
    }

    /**
     * Draws a crosshair vertically on the plot.
     *
     * @param g2  the graphics target.
     * @param dataArea  the data area.
     * @param x  the x-value in Java2D space.
     * @param crosshair  the crosshair.
     */
    protected void drawVerticalCrosshair(Graphics2D g2, Rectangle2D dataArea,
            double x, Crosshair crosshair) {

        if (x >= dataArea.getMinX() && x <= dataArea.getMaxX()) {
            Line2D line = new Line2D.Double(x, dataArea.getMinY(), x,
                    dataArea.getMaxY());
            Paint savedPaint = g2.getPaint();
            Stroke savedStroke = g2.getStroke();
            g2.setPaint(crosshair.getPaint());
            g2.setStroke(crosshair.getStroke());
            g2.draw(line);
            if (crosshair.isLabelVisible()) {
                String label = crosshair.getLabelGenerator().generateLabel(
                        crosshair);
                RectangleAnchor anchor = crosshair.getLabelAnchor();
                Point2D pt = calculateLabelPoint(line, anchor, 5, 5);
                float xx = (float) pt.getX();
                float yy = (float) pt.getY();
                TextAnchor alignPt = textAlignPtForLabelAnchorV(anchor);
                Shape hotspot = TextUtilities.calculateRotatedStringBounds(
                        label, g2, xx, yy, alignPt, 0.0, TextAnchor.CENTER);
                if (!dataArea.contains(hotspot.getBounds2D())) {
                    anchor = flipAnchorH(anchor);
                    pt = calculateLabelPoint(line, anchor, 5, 5);
                    xx = (float) pt.getX();
                    yy = (float) pt.getY();
                    alignPt = textAlignPtForLabelAnchorV(anchor);
                    hotspot = TextUtilities.calculateRotatedStringBounds(
                           label, g2, xx, yy, alignPt, 0.0, TextAnchor.CENTER);
                }
                g2.setPaint(crosshair.getLabelBackgroundPaint());
                g2.fill(hotspot);
                g2.setPaint(crosshair.getLabelOutlinePaint());
                g2.draw(hotspot);
                TextUtilities.drawAlignedString(label, g2, xx, yy, alignPt);
            }
            g2.setPaint(savedPaint);
            g2.setStroke(savedStroke);
        }
    }

    /**
     * Calculates the anchor point for a label.
     *
     * @param line  the line for the crosshair.
     * @param anchor  the anchor point.
     * @param deltaX  the x-offset.
     * @param deltaY  the y-offset.
     *
     * @return The anchor point.
     */
    private Point2D calculateLabelPoint(Line2D line, RectangleAnchor anchor,
            double deltaX, double deltaY) {
        double x = 0.0;
        double y = 0.0;
        boolean left = (anchor == RectangleAnchor.BOTTOM_LEFT 
                || anchor == RectangleAnchor.LEFT 
                || anchor == RectangleAnchor.TOP_LEFT);
        boolean right = (anchor == RectangleAnchor.BOTTOM_RIGHT 
                || anchor == RectangleAnchor.RIGHT 
                || anchor == RectangleAnchor.TOP_RIGHT);
        boolean top = (anchor == RectangleAnchor.TOP_LEFT 
                || anchor == RectangleAnchor.TOP 
                || anchor == RectangleAnchor.TOP_RIGHT);
        boolean bottom = (anchor == RectangleAnchor.BOTTOM_LEFT
                || anchor == RectangleAnchor.BOTTOM
                || anchor == RectangleAnchor.BOTTOM_RIGHT);
        Rectangle rect = line.getBounds();
        Point2D pt = RectangleAnchor.coordinates(rect, anchor);
        // we expect the line to be vertical or horizontal
        if (line.getX1() == line.getX2()) {  // vertical
            x = line.getX1();
            y = (line.getY1() + line.getY2()) / 2.0;
            if (left) {
                x = x - deltaX;
            }
            if (right) {
                x = x + deltaX;
            }
            if (top) {
                y = Math.min(line.getY1(), line.getY2()) + deltaY;
            }
            if (bottom) {
                y = Math.max(line.getY1(), line.getY2()) - deltaY;
            }
        }
        else {  // horizontal
            x = (line.getX1() + line.getX2()) / 2.0;
            y = line.getY1();
            if (left) {
                x = Math.min(line.getX1(), line.getX2()) + deltaX;
            }
            if (right) {
                x = Math.max(line.getX1(), line.getX2()) - deltaX;
            }
            if (top) {
                y = y - deltaY;
            }
            if (bottom) {
                y = y + deltaY;
            }
        }
        return new Point2D.Double(x, y);
    }

    /**
     * Returns the text anchor that is used to align a label to its anchor 
     * point.
     * 
     * @param anchor  the anchor.
     * 
     * @return The text alignment point.
     */
    private TextAnchor textAlignPtForLabelAnchorV(RectangleAnchor anchor) {
        TextAnchor result = TextAnchor.CENTER;
        if (anchor.equals(RectangleAnchor.TOP_LEFT)) {
            result = TextAnchor.TOP_RIGHT;
        }
        else if (anchor.equals(RectangleAnchor.TOP)) {
            result = TextAnchor.TOP_CENTER;
        }
        else if (anchor.equals(RectangleAnchor.TOP_RIGHT)) {
            result = TextAnchor.TOP_LEFT;
        }
        else if (anchor.equals(RectangleAnchor.LEFT)) {
            result = TextAnchor.HALF_ASCENT_RIGHT;
        }
        else if (anchor.equals(RectangleAnchor.RIGHT)) {
            result = TextAnchor.HALF_ASCENT_LEFT;
        }
        else if (anchor.equals(RectangleAnchor.BOTTOM_LEFT)) {
            result = TextAnchor.BOTTOM_RIGHT;
        }
        else if (anchor.equals(RectangleAnchor.BOTTOM)) {
            result = TextAnchor.BOTTOM_CENTER;
        }
        else if (anchor.equals(RectangleAnchor.BOTTOM_RIGHT)) {
            result = TextAnchor.BOTTOM_LEFT;
        }
        return result;
    }

    /**
     * Returns the text anchor that is used to align a label to its anchor
     * point.
     *
     * @param anchor  the anchor.
     *
     * @return The text alignment point.
     */
    private TextAnchor textAlignPtForLabelAnchorH(RectangleAnchor anchor) {
        TextAnchor result = TextAnchor.CENTER;
        if (anchor.equals(RectangleAnchor.TOP_LEFT)) {
            result = TextAnchor.BOTTOM_LEFT;
        }
        else if (anchor.equals(RectangleAnchor.TOP)) {
            result = TextAnchor.BOTTOM_CENTER;
        }
        else if (anchor.equals(RectangleAnchor.TOP_RIGHT)) {
            result = TextAnchor.BOTTOM_RIGHT;
        }
        else if (anchor.equals(RectangleAnchor.LEFT)) {
            result = TextAnchor.HALF_ASCENT_LEFT;
        }
        else if (anchor.equals(RectangleAnchor.RIGHT)) {
            result = TextAnchor.HALF_ASCENT_RIGHT;
        }
        else if (anchor.equals(RectangleAnchor.BOTTOM_LEFT)) {
            result = TextAnchor.TOP_LEFT;
        }
        else if (anchor.equals(RectangleAnchor.BOTTOM)) {
            result = TextAnchor.TOP_CENTER;
        }
        else if (anchor.equals(RectangleAnchor.BOTTOM_RIGHT)) {
            result = TextAnchor.TOP_RIGHT;
        }
        return result;
    }

    private RectangleAnchor flipAnchorH(RectangleAnchor anchor) {
        RectangleAnchor result = anchor;
        if (anchor.equals(RectangleAnchor.TOP_LEFT)) {
            result = RectangleAnchor.TOP_RIGHT;
        }
        else if (anchor.equals(RectangleAnchor.TOP_RIGHT)) {
            result = RectangleAnchor.TOP_LEFT;
        }
        else if (anchor.equals(RectangleAnchor.LEFT)) {
            result = RectangleAnchor.RIGHT;
        }
        else if (anchor.equals(RectangleAnchor.RIGHT)) {
            result = RectangleAnchor.LEFT;
        }
        else if (anchor.equals(RectangleAnchor.BOTTOM_LEFT)) {
            result = RectangleAnchor.BOTTOM_RIGHT;
        }
        else if (anchor.equals(RectangleAnchor.BOTTOM_RIGHT)) {
            result = RectangleAnchor.BOTTOM_LEFT;
        }
        return result;
    }

    private RectangleAnchor flipAnchorV(RectangleAnchor anchor) {
        RectangleAnchor result = anchor;
        if (anchor.equals(RectangleAnchor.TOP_LEFT)) {
            result = RectangleAnchor.BOTTOM_LEFT;
        }
        else if (anchor.equals(RectangleAnchor.TOP_RIGHT)) {
            result = RectangleAnchor.BOTTOM_RIGHT;
        }
        else if (anchor.equals(RectangleAnchor.TOP)) {
            result = RectangleAnchor.BOTTOM;
        }
        else if (anchor.equals(RectangleAnchor.BOTTOM)) {
            result = RectangleAnchor.TOP;
        }
        else if (anchor.equals(RectangleAnchor.BOTTOM_LEFT)) {
            result = RectangleAnchor.TOP_LEFT;
        }
        else if (anchor.equals(RectangleAnchor.BOTTOM_RIGHT)) {
            result = RectangleAnchor.TOP_RIGHT;
        }
        return result;
    }

    /**
     * Tests this overlay for equality with an arbitrary object.
     *
     * @param obj  the object (<code>null permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof CrosshairOverlay)) {
            return false;
        }
        CrosshairOverlay that = (CrosshairOverlay) obj;
        if (!this.xCrosshairs.equals(that.xCrosshairs)) {
            return false;
        }
        if (!this.yCrosshairs.equals(that.yCrosshairs)) {
            return false;
        }
        return true;
    }

    /**
     * Returns a clone of this instance.
     *
     * @return A clone of this instance.
     *
     * @throws java.lang.CloneNotSupportedException if there is some problem
     *     with the cloning.
     */
    public Object clone() throws CloneNotSupportedException {
        CrosshairOverlay clone = (CrosshairOverlay) super.clone();
        clone.xCrosshairs = (List) ObjectUtilities.deepClone(this.xCrosshairs);
        clone.yCrosshairs = (List) ObjectUtilities.deepClone(this.yCrosshairs);
        return clone;
    }

}

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