Java tutorial
/* =========================================================== * JFreeChart : a free chart library for the Java(tm) platform * =========================================================== * * (C) Copyright 2000-2013, 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. * * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. * Other names may be trademarks of their respective owners.] * * ------------------------- * 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. */ @Override 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? */ @Override 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</code> permitted). * * @return A boolean. */ @Override 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. */ @Override public int hashCode() { int hash = 37; // no fields to compute... return hash; } }