linerenderer3d.java

关于jfreechart的电子说明书,一种说明图型使用的介绍

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2005, 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.]
 *
 * -------------------
 * LineRenderer3D.java
 * -------------------
 * (C) Copyright 2004, 2005, by Tobias Selb and Contributors.
 *
 * Original Author:  Tobias Selb;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * $Id: LineRenderer3D.java,v 1.10.2.4 2005/10/25 20:54:16 mungady Exp $
 *
 * Changes
 * -------
 * 15-Oct-2004 : Version 1 (TS);
 * 05-Nov-2004 : Modified drawItem() signature (DG);
 * 11-Nov-2004 : Now uses ShapeUtilities class to translate shapes (DG);
 * 26-Jan-2005 : Update for changes in super class (DG);
 * 13-Apr-2005 : Check item visibility in drawItem() method (DG);
 * 09-Jun-2005 : Use addItemEntity() in drawItem() method (DG);
 * 10-Jun-2005 : Fixed capitalisation of setXOffset() and setYOffset() (DG);
 * 
 */

package org.jfree.chart.renderer.category;

import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Composite;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Paint;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.GeneralPath;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;

import org.jfree.chart.Effect3D;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.event.RendererChangeEvent;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.Marker;
import org.jfree.chart.plot.Plot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.ValueMarker;
import org.jfree.data.Range;
import org.jfree.data.category.CategoryDataset;
import org.jfree.util.ShapeUtilities;

/**
 * A line renderer with a 3D effect.
 * 
 * @author Tobias Selb (http://www.uepselon.com) 
 */
public class LineRenderer3D extends LineAndShapeRenderer 
                            implements Effect3D, Serializable {
   
    /** For serialization. */
    private static final long serialVersionUID = 5467931468380928736L;
    
    /** The default x-offset for the 3D effect. */
    public static final double DEFAULT_X_OFFSET = 12.0;

    /** The default y-offset for the 3D effect. */
    public static final double DEFAULT_Y_OFFSET = 8.0;
   
    /** The default wall paint. */
    public static final Paint DEFAULT_WALL_PAINT = new Color(0xDD, 0xDD, 0xDD);
   
    /** The size of x-offset for the 3D effect. */
    private double xOffset;

    /** The size of y-offset for the 3D effect. */
    private double yOffset;
   
    /** The paint used to shade the left and lower 3D wall. */
    private transient Paint wallPaint;
   
    /**
     * Creates a new renderer.
     */
    public LineRenderer3D() {
        super(true, false);  //Create a line renderer only
        this.xOffset = DEFAULT_X_OFFSET;
        this.yOffset = DEFAULT_Y_OFFSET;
        this.wallPaint = DEFAULT_WALL_PAINT;
    }
   
    /**
     * Returns the x-offset for the 3D effect.
     *
     * @return The x-offset.
     */
    public double getXOffset() {
        return this.xOffset;
    }

    /**
     * Returns the y-offset for the 3D effect.
     *
     * @return The y-offset.
     */
    public double getYOffset() {
        return this.yOffset;
    }
   
    /**
     * Sets the x-offset.
     * 
     * @param xOffset  the x-offset.
     */
    public void setXOffset(double xOffset) {
        this.xOffset = xOffset;
        notifyListeners(new RendererChangeEvent(this));
    }

    /**
     * Sets the y-offset.
     * 
     * @param yOffset  the y-offset.
     */
    public void setYOffset(double yOffset) {
        this.yOffset = yOffset;
        notifyListeners(new RendererChangeEvent(this));
    }

    /**
     * Returns the paint used to highlight the left and bottom wall in the plot
     * background.
     *
     * @return The paint.
     */
    public Paint getWallPaint() {
        return this.wallPaint;
    }

    /**
     * Sets the paint used to hightlight the left and bottom walls in the plot
     * background.
     *
     * @param paint  the paint.
     */
    public void setWallPaint(Paint paint) {
        this.wallPaint = paint;
        notifyListeners(new RendererChangeEvent(this));
    }
   
    /**
     * Draws the background for the plot.
     *
     * @param g2  the graphics device.
     * @param plot  the plot.
     * @param dataArea  the area inside the axes.
     */
    public void drawBackground(Graphics2D g2, CategoryPlot plot, 
                               Rectangle2D dataArea) {

        float x0 = (float) dataArea.getX();
        float x1 = x0 + (float) Math.abs(this.xOffset);
        float x3 = (float) dataArea.getMaxX();
        float x2 = x3 - (float) Math.abs(this.xOffset);

        float y0 = (float) dataArea.getMaxY();
        float y1 = y0 - (float) Math.abs(this.yOffset);
        float y3 = (float) dataArea.getMinY();
        float y2 = y3 + (float) Math.abs(this.yOffset);

        GeneralPath clip = new GeneralPath();
        clip.moveTo(x0, y0);
        clip.lineTo(x0, y2);
        clip.lineTo(x1, y3);
        clip.lineTo(x3, y3);
        clip.lineTo(x3, y1);
        clip.lineTo(x2, y0);
        clip.closePath();

        // fill background...
        Paint backgroundPaint = plot.getBackgroundPaint();
        if (backgroundPaint != null) {
            g2.setPaint(backgroundPaint);
            g2.fill(clip);
        }

        GeneralPath leftWall = new GeneralPath();
        leftWall.moveTo(x0, y0);
        leftWall.lineTo(x0, y2);
        leftWall.lineTo(x1, y3);
        leftWall.lineTo(x1, y1);
        leftWall.closePath();
        g2.setPaint(getWallPaint());
        g2.fill(leftWall);

        GeneralPath bottomWall = new GeneralPath();
        bottomWall.moveTo(x0, y0);
        bottomWall.lineTo(x1, y1);
        bottomWall.lineTo(x3, y1);
        bottomWall.lineTo(x2, y0);
        bottomWall.closePath();
        g2.setPaint(getWallPaint());
        g2.fill(bottomWall);

        // higlight the background corners...
        g2.setPaint(Color.lightGray);
        Line2D corner = new Line2D.Double(x0, y0, x1, y1);
        g2.draw(corner);
        corner.setLine(x1, y1, x1, y3);
        g2.draw(corner);
        corner.setLine(x1, y1, x3, y1);
        g2.draw(corner);

        // draw background image, if there is one...
        Image backgroundImage = plot.getBackgroundImage();
        if (backgroundImage != null) {
            Composite originalComposite = g2.getComposite();
            g2.setComposite(AlphaComposite.getInstance(
                AlphaComposite.SRC, plot.getBackgroundAlpha())
            );
            g2.drawImage(
                backgroundImage,
                (int) x1, (int) y3,
                (int) (x3 - x1 + 1), (int) (y1 - y3 + 1),
                null
            );
            g2.setComposite(originalComposite);
        }

    }

    /**
     * Draws the outline for the plot.
     *
     * @param g2  the graphics device.
     * @param plot  the plot.
     * @param dataArea  the area inside the axes.
     */
    public void drawOutline(Graphics2D g2, CategoryPlot plot, 
                            Rectangle2D dataArea) {

        float x0 = (float) dataArea.getX();
        float x1 = x0 + (float) Math.abs(this.xOffset);
        float x3 = (float) dataArea.getMaxX();
        float x2 = x3 - (float) Math.abs(this.xOffset);

        float y0 = (float) dataArea.getMaxY();
        float y1 = y0 - (float) Math.abs(this.yOffset);
        float y3 = (float) dataArea.getMinY();
        float y2 = y3 + (float) Math.abs(this.yOffset);

        GeneralPath clip = new GeneralPath();
        clip.moveTo(x0, y0);
        clip.lineTo(x0, y2);
        clip.lineTo(x1, y3);
        clip.lineTo(x3, y3);
        clip.lineTo(x3, y1);
        clip.lineTo(x2, y0);
        clip.closePath();

        // put an outline around the data area...
        Stroke outlineStroke = plot.getOutlineStroke();
        Paint outlinePaint = plot.getOutlinePaint();
        if ((outlineStroke != null) && (outlinePaint != null)) {
            g2.setStroke(outlineStroke);
            g2.setPaint(outlinePaint);
            g2.draw(clip);
        }

    }