| /* |
| * Copyright (c) 1997, 2006, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package java.awt.geom; |
| |
| import java.io.Serializable; |
| |
| /** |
| * The <code>Ellipse2D</code> class describes an ellipse that is defined |
| * by a framing rectangle. |
| * <p> |
| * This class is only the abstract superclass for all objects which |
| * store a 2D ellipse. |
| * The actual storage representation of the coordinates is left to |
| * the subclass. |
| * |
| * @author Jim Graham |
| * @since 1.2 |
| */ |
| public abstract class Ellipse2D extends RectangularShape { |
| |
| /** |
| * The <code>Float</code> class defines an ellipse specified |
| * in <code>float</code> precision. |
| * @since 1.2 |
| */ |
| public static class Float extends Ellipse2D implements Serializable { |
| /** |
| * The X coordinate of the upper-left corner of the |
| * framing rectangle of this {@code Ellipse2D}. |
| * @since 1.2 |
| * @serial |
| */ |
| public float x; |
| |
| /** |
| * The Y coordinate of the upper-left corner of the |
| * framing rectangle of this {@code Ellipse2D}. |
| * @since 1.2 |
| * @serial |
| */ |
| public float y; |
| |
| /** |
| * The overall width of this <code>Ellipse2D</code>. |
| * @since 1.2 |
| * @serial |
| */ |
| public float width; |
| |
| /** |
| * The overall height of this <code>Ellipse2D</code>. |
| * @since 1.2 |
| * @serial |
| */ |
| public float height; |
| |
| /** |
| * Constructs a new <code>Ellipse2D</code>, initialized to |
| * location (0, 0) and size (0, 0). |
| * @since 1.2 |
| */ |
| public Float() { |
| } |
| |
| /** |
| * Constructs and initializes an <code>Ellipse2D</code> from the |
| * specified coordinates. |
| * |
| * @param x the X coordinate of the upper-left corner |
| * of the framing rectangle |
| * @param y the Y coordinate of the upper-left corner |
| * of the framing rectangle |
| * @param w the width of the framing rectangle |
| * @param h the height of the framing rectangle |
| * @since 1.2 |
| */ |
| public Float(float x, float y, float w, float h) { |
| setFrame(x, y, w, h); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * @since 1.2 |
| */ |
| public double getX() { |
| return (double) x; |
| } |
| |
| /** |
| * {@inheritDoc} |
| * @since 1.2 |
| */ |
| public double getY() { |
| return (double) y; |
| } |
| |
| /** |
| * {@inheritDoc} |
| * @since 1.2 |
| */ |
| public double getWidth() { |
| return (double) width; |
| } |
| |
| /** |
| * {@inheritDoc} |
| * @since 1.2 |
| */ |
| public double getHeight() { |
| return (double) height; |
| } |
| |
| /** |
| * {@inheritDoc} |
| * @since 1.2 |
| */ |
| public boolean isEmpty() { |
| return (width <= 0.0 || height <= 0.0); |
| } |
| |
| /** |
| * Sets the location and size of the framing rectangle of this |
| * <code>Shape</code> to the specified rectangular values. |
| * |
| * @param x the X coordinate of the upper-left corner of the |
| * specified rectangular shape |
| * @param y the Y coordinate of the upper-left corner of the |
| * specified rectangular shape |
| * @param w the width of the specified rectangular shape |
| * @param h the height of the specified rectangular shape |
| * @since 1.2 |
| */ |
| public void setFrame(float x, float y, float w, float h) { |
| this.x = x; |
| this.y = y; |
| this.width = w; |
| this.height = h; |
| } |
| |
| /** |
| * {@inheritDoc} |
| * @since 1.2 |
| */ |
| public void setFrame(double x, double y, double w, double h) { |
| this.x = (float) x; |
| this.y = (float) y; |
| this.width = (float) w; |
| this.height = (float) h; |
| } |
| |
| /** |
| * {@inheritDoc} |
| * @since 1.2 |
| */ |
| public Rectangle2D getBounds2D() { |
| return new Rectangle2D.Float(x, y, width, height); |
| } |
| |
| /* |
| * JDK 1.6 serialVersionUID |
| */ |
| private static final long serialVersionUID = -6633761252372475977L; |
| } |
| |
| /** |
| * The <code>Double</code> class defines an ellipse specified |
| * in <code>double</code> precision. |
| * @since 1.2 |
| */ |
| public static class Double extends Ellipse2D implements Serializable { |
| /** |
| * The X coordinate of the upper-left corner of the |
| * framing rectangle of this {@code Ellipse2D}. |
| * @since 1.2 |
| * @serial |
| */ |
| public double x; |
| |
| /** |
| * The Y coordinate of the upper-left corner of the |
| * framing rectangle of this {@code Ellipse2D}. |
| * @since 1.2 |
| * @serial |
| */ |
| public double y; |
| |
| /** |
| * The overall width of this <code>Ellipse2D</code>. |
| * @since 1.2 |
| * @serial |
| */ |
| public double width; |
| |
| /** |
| * The overall height of the <code>Ellipse2D</code>. |
| * @since 1.2 |
| * @serial |
| */ |
| public double height; |
| |
| /** |
| * Constructs a new <code>Ellipse2D</code>, initialized to |
| * location (0, 0) and size (0, 0). |
| * @since 1.2 |
| */ |
| public Double() { |
| } |
| |
| /** |
| * Constructs and initializes an <code>Ellipse2D</code> from the |
| * specified coordinates. |
| * |
| * @param x the X coordinate of the upper-left corner |
| * of the framing rectangle |
| * @param y the Y coordinate of the upper-left corner |
| * of the framing rectangle |
| * @param w the width of the framing rectangle |
| * @param h the height of the framing rectangle |
| * @since 1.2 |
| */ |
| public Double(double x, double y, double w, double h) { |
| setFrame(x, y, w, h); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * @since 1.2 |
| */ |
| public double getX() { |
| return x; |
| } |
| |
| /** |
| * {@inheritDoc} |
| * @since 1.2 |
| */ |
| public double getY() { |
| return y; |
| } |
| |
| /** |
| * {@inheritDoc} |
| * @since 1.2 |
| */ |
| public double getWidth() { |
| return width; |
| } |
| |
| /** |
| * {@inheritDoc} |
| * @since 1.2 |
| */ |
| public double getHeight() { |
| return height; |
| } |
| |
| /** |
| * {@inheritDoc} |
| * @since 1.2 |
| */ |
| public boolean isEmpty() { |
| return (width <= 0.0 || height <= 0.0); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * @since 1.2 |
| */ |
| public void setFrame(double x, double y, double w, double h) { |
| this.x = x; |
| this.y = y; |
| this.width = w; |
| this.height = h; |
| } |
| |
| /** |
| * {@inheritDoc} |
| * @since 1.2 |
| */ |
| public Rectangle2D getBounds2D() { |
| return new Rectangle2D.Double(x, y, width, height); |
| } |
| |
| /* |
| * JDK 1.6 serialVersionUID |
| */ |
| private static final long serialVersionUID = 5555464816372320683L; |
| } |
| |
| /** |
| * This is an abstract class that cannot be instantiated directly. |
| * Type-specific implementation subclasses are available for |
| * instantiation and provide a number of formats for storing |
| * the information necessary to satisfy the various accessor |
| * methods below. |
| * |
| * @see java.awt.geom.Ellipse2D.Float |
| * @see java.awt.geom.Ellipse2D.Double |
| * @since 1.2 |
| */ |
| protected Ellipse2D() { |
| } |
| |
| /** |
| * {@inheritDoc} |
| * @since 1.2 |
| */ |
| public boolean contains(double x, double y) { |
| // Normalize the coordinates compared to the ellipse |
| // having a center at 0,0 and a radius of 0.5. |
| double ellw = getWidth(); |
| if (ellw <= 0.0) { |
| return false; |
| } |
| double normx = (x - getX()) / ellw - 0.5; |
| double ellh = getHeight(); |
| if (ellh <= 0.0) { |
| return false; |
| } |
| double normy = (y - getY()) / ellh - 0.5; |
| return (normx * normx + normy * normy) < 0.25; |
| } |
| |
| /** |
| * {@inheritDoc} |
| * @since 1.2 |
| */ |
| public boolean intersects(double x, double y, double w, double h) { |
| if (w <= 0.0 || h <= 0.0) { |
| return false; |
| } |
| // Normalize the rectangular coordinates compared to the ellipse |
| // having a center at 0,0 and a radius of 0.5. |
| double ellw = getWidth(); |
| if (ellw <= 0.0) { |
| return false; |
| } |
| double normx0 = (x - getX()) / ellw - 0.5; |
| double normx1 = normx0 + w / ellw; |
| double ellh = getHeight(); |
| if (ellh <= 0.0) { |
| return false; |
| } |
| double normy0 = (y - getY()) / ellh - 0.5; |
| double normy1 = normy0 + h / ellh; |
| // find nearest x (left edge, right edge, 0.0) |
| // find nearest y (top edge, bottom edge, 0.0) |
| // if nearest x,y is inside circle of radius 0.5, then intersects |
| double nearx, neary; |
| if (normx0 > 0.0) { |
| // center to left of X extents |
| nearx = normx0; |
| } else if (normx1 < 0.0) { |
| // center to right of X extents |
| nearx = normx1; |
| } else { |
| nearx = 0.0; |
| } |
| if (normy0 > 0.0) { |
| // center above Y extents |
| neary = normy0; |
| } else if (normy1 < 0.0) { |
| // center below Y extents |
| neary = normy1; |
| } else { |
| neary = 0.0; |
| } |
| return (nearx * nearx + neary * neary) < 0.25; |
| } |
| |
| /** |
| * {@inheritDoc} |
| * @since 1.2 |
| */ |
| public boolean contains(double x, double y, double w, double h) { |
| return (contains(x, y) && |
| contains(x + w, y) && |
| contains(x, y + h) && |
| contains(x + w, y + h)); |
| } |
| |
| /** |
| * Returns an iteration object that defines the boundary of this |
| * <code>Ellipse2D</code>. |
| * The iterator for this class is multi-threaded safe, which means |
| * that this <code>Ellipse2D</code> class guarantees that |
| * modifications to the geometry of this <code>Ellipse2D</code> |
| * object do not affect any iterations of that geometry that |
| * are already in process. |
| * @param at an optional <code>AffineTransform</code> to be applied to |
| * the coordinates as they are returned in the iteration, or |
| * <code>null</code> if untransformed coordinates are desired |
| * @return the <code>PathIterator</code> object that returns the |
| * geometry of the outline of this <code>Ellipse2D</code>, |
| * one segment at a time. |
| * @since 1.2 |
| */ |
| public PathIterator getPathIterator(AffineTransform at) { |
| return new EllipseIterator(this, at); |
| } |
| |
| /** |
| * Returns the hashcode for this <code>Ellipse2D</code>. |
| * @return the hashcode for this <code>Ellipse2D</code>. |
| * @since 1.6 |
| */ |
| public int hashCode() { |
| long bits = java.lang.Double.doubleToLongBits(getX()); |
| bits += java.lang.Double.doubleToLongBits(getY()) * 37; |
| bits += java.lang.Double.doubleToLongBits(getWidth()) * 43; |
| bits += java.lang.Double.doubleToLongBits(getHeight()) * 47; |
| return (((int) bits) ^ ((int) (bits >> 32))); |
| } |
| |
| /** |
| * Determines whether or not the specified <code>Object</code> is |
| * equal to this <code>Ellipse2D</code>. The specified |
| * <code>Object</code> is equal to this <code>Ellipse2D</code> |
| * if it is an instance of <code>Ellipse2D</code> and if its |
| * location and size are the same as this <code>Ellipse2D</code>. |
| * @param obj an <code>Object</code> to be compared with this |
| * <code>Ellipse2D</code>. |
| * @return <code>true</code> if <code>obj</code> is an instance |
| * of <code>Ellipse2D</code> and has the same values; |
| * <code>false</code> otherwise. |
| * @since 1.6 |
| */ |
| public boolean equals(Object obj) { |
| if (obj == this) { |
| return true; |
| } |
| if (obj instanceof Ellipse2D) { |
| Ellipse2D e2d = (Ellipse2D) obj; |
| return ((getX() == e2d.getX()) && |
| (getY() == e2d.getY()) && |
| (getWidth() == e2d.getWidth()) && |
| (getHeight() == e2d.getHeight())); |
| } |
| return false; |
| } |
| } |
