legendgraphic.java

java图形利器

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2006, 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.]
 *
 * ------------------
 * LegendGraphic.java
 * ------------------
 * (C) Copyright 2004-2006, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: LegendGraphic.java,v 1.9.2.4 2006/12/13 11:23:38 mungady Exp $
 *
 * Changes
 * -------
 * 26-Oct-2004 : Version 1 (DG);
 * 21-Jan-2005 : Modified return type of RectangleAnchor.coordinates() 
 *               method (DG);
 * 20-Apr-2005 : Added new draw() method (DG);
 * 13-May-2005 : Fixed to respect margin, border and padding settings (DG);
 * 01-Sep-2005 : Implemented PublicCloneable (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 13-Dec-2006 : Added fillPaintTransformer attribute, so legend graphics can
 *               display gradient paint correctly, updated equals() and 
 *               corrected clone() (DG);
 * 
 */

package org.jfree.chart.title;

import java.awt.GradientPaint;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

import org.jfree.chart.block.AbstractBlock;
import org.jfree.chart.block.Block;
import org.jfree.chart.block.LengthConstraintType;
import org.jfree.chart.block.RectangleConstraint;
import org.jfree.io.SerialUtilities;
import org.jfree.ui.GradientPaintTransformer;
import org.jfree.ui.RectangleAnchor;
import org.jfree.ui.Size2D;
import org.jfree.ui.StandardGradientPaintTransformer;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PaintUtilities;
import org.jfree.util.PublicCloneable;
import org.jfree.util.ShapeUtilities;

/**
 * The graphical item within a legend item.
 */
public class LegendGraphic extends AbstractBlock 
                           implements Block, PublicCloneable {
    
    /** 
     * A flag that controls whether or not the shape is visible - see also 
     * lineVisible. 
     */
    private boolean shapeVisible;
    
    /** 
     * The shape to display.  To allow for accurate positioning, the center
     * of the shape should be at (0, 0). 
     */
    private transient Shape shape;
    
    /**
     * Defines the location within the block to which the shape will be aligned.
     */
    private RectangleAnchor shapeLocation;
    
    /** 
     * Defines the point on the shape's bounding rectangle that will be 
     * aligned to the drawing location when the shape is rendered.
     */
    private RectangleAnchor shapeAnchor;
    
    /** A flag that controls whether or not the shape is filled. */
    private boolean shapeFilled;
    
    /** The fill paint for the shape. */
    private transient Paint fillPaint;
    
    /**
     * The fill paint transformer (used if the fillPaint is an instance of
     * GradientPaint).
     * 
     * @since 1.0.4
     */
    private GradientPaintTransformer fillPaintTransformer;
    
    /** A flag that controls whether or not the shape outline is visible. */
    private boolean shapeOutlineVisible;
    
    /** The outline paint for the shape. */
    private transient Paint outlinePaint;
    
    /** The outline stroke for the shape. */
    private transient Stroke outlineStroke;
    
    /** 
     * A flag that controls whether or not the line is visible - see also 
     * shapeVisible. 
     */
    private boolean lineVisible;
    
    /** The line. */
    private transient Shape line;
    
    /** The line stroke. */
    private transient Stroke lineStroke;
    
    /** The line paint. */
    private transient Paint linePaint;
    
    /**
     * Creates a new legend graphic.
     * 
     * @param shape  the shape (<code>null</code> not permitted).
     * @param fillPaint  the fill paint (<code>null</code> not permitted).
     */
    public LegendGraphic(Shape shape, Paint fillPaint) {
        if (shape == null) {
            throw new IllegalArgumentException("Null 'shape' argument.");
        }
        if (fillPaint == null) {
            throw new IllegalArgumentException("Null 'fillPaint' argument.");
        }
        this.shapeVisible = true;
        this.shape = shape;
        this.shapeAnchor = RectangleAnchor.CENTER;
        this.shapeLocation = RectangleAnchor.CENTER;
        this.shapeFilled = true;
        this.fillPaint = fillPaint;
        this.fillPaintTransformer = new StandardGradientPaintTransformer();
        setPadding(2.0, 2.0, 2.0, 2.0);
    }
    
    /**
     * Returns a flag that controls whether or not the shape
     * is visible.
     * 
     * @return A boolean.
     */
    public boolean isShapeVisible() {
        return this.shapeVisible;
    }
    
    /**
     * Sets a flag that controls whether or not the shape is 
     * visible.
     * 
     * @param visible  the flag.
     */
    public void setShapeVisible(boolean visible) {
        this.shapeVisible = visible;
    }
    
    /**
     * Returns the shape.
     * 
     * @return The shape.
     */
    public Shape getShape() {
        return this.shape;
    }
    
    /**
     * Sets the shape.
     * 
     * @param shape  the shape.
     */
    public void setShape(Shape shape) {
        this.shape = shape;
    }

    /**
     * Returns a flag that controls whether or not the shapes
     * are filled.
     * 
     * @return A boolean.
     */
    public boolean isShapeFilled() {
        return this.shapeFilled;
    }
    
    /**
     * Sets a flag that controls whether or not the shape is
     * filled.
     * 
     * @param filled  the flag.
     */
    public void setShapeFilled(boolean filled) {
        this.shapeFilled = filled;
    }

    /**
     * Returns the paint used to fill the shape.
     * 
     * @return The fill paint.
     */
    public Paint getFillPaint() {
        return this.fillPaint;
    }
    
    /**
     * Sets the paint used to fill the shape.
     * 
     * @param paint  the paint.
     */
    public void setFillPaint(Paint paint) {
        this.fillPaint = paint;
    }
    
    /**
     * Returns the transformer used when the fill paint is an instance of 
     * <code>GradientPaint</code>.
     * 
     * @return The transformer (never <code>null</code>).
     * 
     * @since 1.0.4.
     */
    public GradientPaintTransformer getFillPaintTransformer() {
        return this.fillPaintTransformer;
    }
    
    /**
     * Sets the transformer used when the fill paint is an instance of 
     * <code>GradientPaint</code>.
     * 
     * @param transformer  the transformer (<code>null</code> not permitted).
     * 
     * @since 1.0.4
     */
    public void setFillPaintTransformer(GradientPaintTransformer transformer) {
        if (transformer == null) {
            throw new IllegalArgumentException("Null 'transformer' argument.");
        }
        this.fillPaintTransformer = transformer;
    }
    
    /**
     * Returns a flag that controls whether the shape outline is visible.
     * 
     * @return A boolean.
     */
    public boolean isShapeOutlineVisible() {
        return this.shapeOutlineVisible;
    }
    
    /**
     * Sets a flag that controls whether or not the shape outline
     * is visible.
     * 
     * @param visible  the flag.
     */
    public void setShapeOutlineVisible(boolean visible) {
        this.shapeOutlineVisible = visible;
    }
    
    /**
     * Returns the outline paint.
     * 
     * @return The paint.
     */
    public Paint getOutlinePaint() {
        return this.outlinePaint;
    }
    
    /**
     * Sets the outline paint.
     * 
     * @param paint  the paint.
     */
    public void setOutlinePaint(Paint paint) {
        this.outlinePaint = paint;
    }

    /**
     * Returns the outline stroke.
     * 
     * @return The stroke.
     */
    public Stroke getOutlineStroke() {
        return this.outlineStroke;
    }
    
    /**
     * Sets the outline stroke.
     * 
     * @param stroke  the stroke.
     */
    public void setOutlineStroke(Stroke stroke) {
        this.outlineStroke = stroke;
    }

    /**
     * Returns the shape anchor.
     * 
     * @return The shape anchor.
     */
    public RectangleAnchor getShapeAnchor() {
        return this.shapeAnchor;
    }
    
    /**
     * Sets the shape anchor.  This defines a point on the shapes bounding
     * rectangle that will be used to align the shape to a location.
     * 
     * @param anchor  the anchor (<code>null</code> not permitted).
     */
    public void setShapeAnchor(RectangleAnchor anchor) {
        if (anchor == null) {
            throw new IllegalArgumentException("Null 'anchor' argument.");
        }
        this.shapeAnchor = anchor;    
    }
    
    /**
     * Returns the shape location.
     * 
     * @return The shape location.
     */
    public RectangleAnchor getShapeLocation() {
        return this.shapeLocation;