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jfreechart example source code file (StandardXYBarPainter.java)

This example jfreechart source code file (StandardXYBarPainter.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, color, color, geometry, gradientpainttransformer, io, paint, rectangle2d, rectangleedge, rectangleedge, rectangularshape, rectangularshape, serializable, standardxybarpainter, standardxybarpainter, stroke, xybarrenderer

The jfreechart StandardXYBarPainter.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.]
 *
 * -------------------------
 * StandardXYBarPainter.java
 * -------------------------
 * (C) Copyright 2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes:
 * --------
 * 19-Jun-2008 : Version 1 (DG);
 *
 */

package org.jfree.chart.renderer.xy;

import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Stroke;
import java.awt.geom.Rectangle2D;
import java.awt.geom.RectangularShape;
import java.io.Serializable;

import org.jfree.ui.GradientPaintTransformer;
import org.jfree.ui.RectangleEdge;

/**
 * An implementation of the {@link XYBarPainter} interface that preserves the
 * behaviour of bar painting that existed prior to the introduction of the
 * {@link XYBarPainter} interface.
 *
 * @see GradientXYBarPainter
 *
 * @since 1.0.11
 */
public class StandardXYBarPainter implements XYBarPainter, Serializable {

    /**
     * Creates a new instance.
     */
    public StandardXYBarPainter() {
    }

    /**
     * Paints a single bar instance.
     *
     * @param g2  the graphics target.
     * @param renderer  the renderer.
     * @param row  the row index.
     * @param column  the column index.
     * @param bar  the bar
     * @param base  indicates which side of the rectangle is the base of the
     *              bar.
     */
    public void paintBar(Graphics2D g2, XYBarRenderer renderer, int row,
            int column, RectangularShape bar, RectangleEdge base) {

        Paint itemPaint = renderer.getItemPaint(row, column);
        GradientPaintTransformer t = renderer.getGradientPaintTransformer();
        if (t != null && itemPaint instanceof GradientPaint) {
            itemPaint = t.transform((GradientPaint) itemPaint, bar);
        }
        g2.setPaint(itemPaint);
        g2.fill(bar);

        // draw the outline...
        if (renderer.isDrawBarOutline()) {
               // && state.getBarWidth() > BAR_OUTLINE_WIDTH_THRESHOLD) {
            Stroke stroke = renderer.getItemOutlineStroke(row, column);
            Paint paint = renderer.getItemOutlinePaint(row, column);
            if (stroke != null && paint != null) {
                g2.setStroke(stroke);
                g2.setPaint(paint);
                g2.draw(bar);
            }
        }

    }

    /**
     * Paints a single bar instance.
     *
     * @param g2  the graphics target.
     * @param renderer  the renderer.
     * @param row  the row index.
     * @param column  the column index.
     * @param bar  the bar
     * @param base  indicates which side of the rectangle is the base of the
     *              bar.
     * @param pegShadow  peg the shadow to the base of the bar?
     */
    public void paintBarShadow(Graphics2D g2, XYBarRenderer renderer, int row,
            int column, RectangularShape bar, RectangleEdge base,
            boolean pegShadow) {

        // handle a special case - if the bar colour has alpha == 0, it is
        // invisible so we shouldn't draw any shadow
        Paint itemPaint = renderer.getItemPaint(row, column);
        if (itemPaint instanceof Color) {
            Color c = (Color) itemPaint;
            if (c.getAlpha() == 0) {
                return;
            }
        }

        RectangularShape shadow = createShadow(bar, renderer.getShadowXOffset(),
                renderer.getShadowYOffset(), base, pegShadow);
        g2.setPaint(Color.gray);
        g2.fill(shadow);

    }

    /**
     * Creates a shadow for the bar.
     *
     * @param bar  the bar shape.
     * @param xOffset  the x-offset for the shadow.
     * @param yOffset  the y-offset for the shadow.
     * @param base  the edge that is the base of the bar.
     * @param pegShadow  peg the shadow to the base?
     *
     * @return A rectangle for the shadow.
     */
    private Rectangle2D createShadow(RectangularShape bar, double xOffset,
            double yOffset, RectangleEdge base, boolean pegShadow) {
        double x0 = bar.getMinX();
        double x1 = bar.getMaxX();
        double y0 = bar.getMinY();
        double y1 = bar.getMaxY();
        if (base == RectangleEdge.TOP) {
            x0 += xOffset;
            x1 += xOffset;
            if (!pegShadow) {
                y0 += yOffset;
            }
            y1 += yOffset;
        }
        else if (base == RectangleEdge.BOTTOM) {
            x0 += xOffset;
            x1 += xOffset;
            y0 += yOffset;
            if (!pegShadow) {
                y1 += yOffset;
            }
        }
        else if (base == RectangleEdge.LEFT) {
            if (!pegShadow) {
                x0 += xOffset;
            }
            x1 += xOffset;
            y0 += yOffset;
            y1 += yOffset;
        }
        else if (base == RectangleEdge.RIGHT) {
            x0 += xOffset;
            if (!pegShadow) {
                x1 += xOffset;
            }
            y0 += yOffset;
            y1 += yOffset;
        }
        return new Rectangle2D.Double(x0, y0, (x1 - x0), (y1 - y0));
    }

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

    /**
     * Returns a hash code for this instance.
     *
     * @return A hash code.
     */
    public int hashCode() {
        int hash = 37;
        // no fields to compute...
        return hash;
    }

}

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