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.] * * -------------------- * RectangleAnchor.java * -------------------- * (C) Copyright 2003-2014, by Object Refinery Limited. * * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): -; * * Changes: * -------- * 31-Oct-2003 (DG); * 01-Apr-2004 : Changed java.awt.geom.Dimension2D to org.jfree.ui.Size2D * because of JDK bug 4976448 which persists on JDK 1.3.1 (DG); * 21-Jan-2005 : Changed return type of coordinates() method (DG); * 16-Jun-2012 : Moved from JCommon to JFreeChart (DG); * */ package org.jfree.chart.ui; import java.awt.geom.Point2D; import java.awt.geom.Rectangle2D; import org.jfree.chart.util.ParamChecks; /** * Used to indicate an anchor point for a rectangle. */ public enum RectangleAnchor { /** Center. */ CENTER("RectangleAnchor.CENTER"), /** Top. */ TOP("RectangleAnchor.TOP"), /** Top-Left. */ TOP_LEFT("RectangleAnchor.TOP_LEFT"), /** Top-Right. */ TOP_RIGHT("RectangleAnchor.TOP_RIGHT"), /** Bottom. */ BOTTOM("RectangleAnchor.BOTTOM"), /** Bottom-Left. */ BOTTOM_LEFT("RectangleAnchor.BOTTOM_LEFT"), /** Bottom-Right. */ BOTTOM_RIGHT("RectangleAnchor.BOTTOM_RIGHT"), /** Left. */ LEFT("RectangleAnchor.LEFT"), /** Right. */ RIGHT("RectangleAnchor.RIGHT"); /** The name. */ private final String name; /** * Private constructor. * * @param name the name. */ private RectangleAnchor(String name) { this.name = name; } /** * Returns the anchor point relative to the specified rectangle. * * @param rectangle the rectangle (<code>null</code> not permitted). * * @return The anchor point (never <code>null</code>). */ public Point2D getAnchorPoint(Rectangle2D rectangle) { ParamChecks.nullNotPermitted(rectangle, "rectangle"); Point2D result = new Point2D.Double(); if (this == RectangleAnchor.CENTER) { result.setLocation(rectangle.getCenterX(), rectangle.getCenterY()); } else if (this == RectangleAnchor.TOP) { result.setLocation(rectangle.getCenterX(), rectangle.getMinY()); } else if (this == RectangleAnchor.BOTTOM) { result.setLocation(rectangle.getCenterX(), rectangle.getMaxY()); } else if (this == RectangleAnchor.LEFT) { result.setLocation(rectangle.getMinX(), rectangle.getCenterY()); } else if (this == RectangleAnchor.RIGHT) { result.setLocation(rectangle.getMaxX(), rectangle.getCenterY()); } else if (this == RectangleAnchor.TOP_LEFT) { result.setLocation(rectangle.getMinX(), rectangle.getMinY()); } else if (this == RectangleAnchor.TOP_RIGHT) { result.setLocation(rectangle.getMaxX(), rectangle.getMinY()); } else if (this == RectangleAnchor.BOTTOM_LEFT) { result.setLocation(rectangle.getMinX(), rectangle.getMaxY()); } else if (this == RectangleAnchor.BOTTOM_RIGHT) { result.setLocation(rectangle.getMaxX(), rectangle.getMaxY()); } return result; } /** * Returns a string representing the object. * * @return The string. */ @Override public String toString() { return this.name; } /** * Returns the (x, y) coordinates of the specified anchor. * * @param rectangle the rectangle. * @param anchor the anchor. * * @return The (x, y) coordinates. * * @deprecated Use {@link #getAnchorPoint(java.awt.geom.Rectangle2D)}. */ public static Point2D coordinates(Rectangle2D rectangle, RectangleAnchor anchor) { return anchor.getAnchorPoint(rectangle); } /** * Creates a new rectangle with the specified dimensions that is aligned to * the given anchor point <code>(anchorX, anchorY)</code>. * * @param dimensions the dimensions (<code>null</code> not permitted). * @param anchorX the x-anchor. * @param anchorY the y-anchor. * @param anchor the anchor (<code>null</code> not permitted). * * @return A rectangle. */ public static Rectangle2D createRectangle(Size2D dimensions, double anchorX, double anchorY, RectangleAnchor anchor) { Rectangle2D result = null; double w = dimensions.getWidth(); double h = dimensions.getHeight(); if (anchor == RectangleAnchor.CENTER) { result = new Rectangle2D.Double(anchorX - w / 2.0, anchorY - h / 2.0, w, h); } else if (anchor == RectangleAnchor.TOP) { result = new Rectangle2D.Double(anchorX - w / 2.0, anchorY - h / 2.0, w, h); } else if (anchor == RectangleAnchor.BOTTOM) { result = new Rectangle2D.Double(anchorX - w / 2.0, anchorY - h / 2.0, w, h); } else if (anchor == RectangleAnchor.LEFT) { result = new Rectangle2D.Double(anchorX, anchorY - h / 2.0, w, h); } else if (anchor == RectangleAnchor.RIGHT) { result = new Rectangle2D.Double(anchorX - w, anchorY - h / 2.0, w, h); } else if (anchor == RectangleAnchor.TOP_LEFT) { result = new Rectangle2D.Double(anchorX - w / 2.0, anchorY - h / 2.0, w, h); } else if (anchor == RectangleAnchor.TOP_RIGHT) { result = new Rectangle2D.Double(anchorX - w / 2.0, anchorY - h / 2.0, w, h); } else if (anchor == RectangleAnchor.BOTTOM_LEFT) { result = new Rectangle2D.Double(anchorX - w / 2.0, anchorY - h / 2.0, w, h); } else if (anchor == RectangleAnchor.BOTTOM_RIGHT) { result = new Rectangle2D.Double(anchorX - w / 2.0, anchorY - h / 2.0, w, h); } return result; } }