Java tutorial
/* =========================================================== * JFreeChart : a free chart library for the Java(tm) platform * =========================================================== * * (C) Copyright 2000-2014, 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.] * * ---------------------- * ChartTransferable.java * ---------------------- * (C) Copyright 2009-2014, by Object Refinery Limited. * * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): -; * * Changes * ------- * 08-Apr-2009 : Version 1, with inspiration from patch 1460845 (DG); * 05-May-2009 : Match the scaling options provided by the ChartPanel * class (DG); * */ package org.jfree.chart; import java.awt.Graphics2D; import java.awt.datatransfer.DataFlavor; import java.awt.datatransfer.Transferable; import java.awt.datatransfer.UnsupportedFlavorException; import java.awt.geom.AffineTransform; import java.awt.geom.Rectangle2D; import java.awt.image.BufferedImage; import java.io.IOException; /** * A class used to represent a chart on the clipboard. * * @since 1.0.13 */ public class ChartTransferable implements Transferable { /** The data flavor. */ final DataFlavor imageFlavor = new DataFlavor("image/x-java-image; class=java.awt.Image", "Image"); /** The chart. */ private JFreeChart chart; /** The width of the chart on the clipboard. */ private int width; /** The height of the chart on the clipboard. */ private int height; /** * The smallest width at which the chart will be drawn (if necessary, the * chart will then be scaled down to fit the requested width). * * @since 1.0.14 */ private int minDrawWidth; /** * The smallest height at which the chart will be drawn (if necessary, the * chart will then be scaled down to fit the requested height). * * @since 1.0.14 */ private int minDrawHeight; /** * The largest width at which the chart will be drawn (if necessary, the * chart will then be scaled up to fit the requested width). * * @since 1.0.14 */ private int maxDrawWidth; /** * The largest height at which the chart will be drawn (if necessary, the * chart will then be scaled up to fit the requested height). * * @since 1.0.14 */ private int maxDrawHeight; /** * Creates a new chart selection. * * @param chart the chart. * @param width the chart width. * @param height the chart height. */ public ChartTransferable(JFreeChart chart, int width, int height) { this(chart, width, height, true); } /** * Creates a new chart selection. * * @param chart the chart. * @param width the chart width. * @param height the chart height. * @param cloneData clone the dataset(s)? */ public ChartTransferable(JFreeChart chart, int width, int height, boolean cloneData) { this(chart, width, height, 0, 0, Integer.MAX_VALUE, Integer.MAX_VALUE, true); } /** * Creates a new chart selection. The minimum and maximum drawing * dimensions are used to match the scaling behaviour in the * {@link ChartPanel} class. * * @param chart the chart. * @param width the chart width. * @param height the chart height. * @param minDrawW the minimum drawing width. * @param minDrawH the minimum drawing height. * @param maxDrawW the maximum drawing width. * @param maxDrawH the maximum drawing height. * @param cloneData clone the dataset(s)? * * @since 1.0.14 */ public ChartTransferable(JFreeChart chart, int width, int height, int minDrawW, int minDrawH, int maxDrawW, int maxDrawH, boolean cloneData) { // we clone the chart because presumably there can be some delay // between putting this instance on the system clipboard and // actually having the getTransferData() method called... try { this.chart = (JFreeChart) chart.clone(); } catch (CloneNotSupportedException e) { this.chart = chart; } // FIXME: we've cloned the chart, but the dataset(s) aren't cloned // and we should do that this.width = width; this.height = height; this.minDrawWidth = minDrawW; this.minDrawHeight = minDrawH; this.maxDrawWidth = maxDrawW; this.maxDrawHeight = maxDrawH; } /** * Returns the data flavors supported. * * @return The data flavors supported. */ @Override public DataFlavor[] getTransferDataFlavors() { return new DataFlavor[] { this.imageFlavor }; } /** * Returns <code>true</code> if the specified flavor is supported. * * @param flavor the flavor. * * @return A boolean. */ @Override public boolean isDataFlavorSupported(DataFlavor flavor) { return this.imageFlavor.equals(flavor); } /** * Returns the content for the requested flavor, if it is supported. * * @param flavor the requested flavor. * * @return The content. * * @throws java.awt.datatransfer.UnsupportedFlavorException if the flavor * is not supported. * @throws java.io.IOException if there is an IO problem. */ @Override public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException { if (this.imageFlavor.equals(flavor)) { return createBufferedImage(this.chart, this.width, this.height, this.minDrawWidth, this.minDrawHeight, this.maxDrawWidth, this.maxDrawHeight); } else { throw new UnsupportedFlavorException(flavor); } } /** * A utility method that creates an image of a chart, with scaling. * * @param chart the chart. * @param w the image width. * @param h the image height. * @param minDrawW the minimum width for chart drawing. * @param minDrawH the minimum height for chart drawing. * @param maxDrawW the maximum width for chart drawing. * @param maxDrawH the maximum height for chart drawing. * * @return A chart image. * * @since 1.0.14 */ private BufferedImage createBufferedImage(JFreeChart chart, int w, int h, int minDrawW, int minDrawH, int maxDrawW, int maxDrawH) { BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB); Graphics2D g2 = image.createGraphics(); // work out if scaling is required... boolean scale = false; double drawWidth = w; double drawHeight = h; double scaleX = 1.0; double scaleY = 1.0; if (drawWidth < minDrawW) { scaleX = drawWidth / minDrawW; drawWidth = minDrawW; scale = true; } else if (drawWidth > maxDrawW) { scaleX = drawWidth / maxDrawW; drawWidth = maxDrawW; scale = true; } if (drawHeight < minDrawH) { scaleY = drawHeight / minDrawH; drawHeight = minDrawH; scale = true; } else if (drawHeight > maxDrawH) { scaleY = drawHeight / maxDrawH; drawHeight = maxDrawH; scale = true; } Rectangle2D chartArea = new Rectangle2D.Double(0.0, 0.0, drawWidth, drawHeight); if (scale) { AffineTransform st = AffineTransform.getScaleInstance(scaleX, scaleY); g2.transform(st); } chart.draw(g2, chartArea, null, null); g2.dispose(); return image; } }