/*
 * Copyright 1997-2006 Sun Microsystems, Inc.  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.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

package org.loon.framework.android.game.core.graphics.geom;

import java.io.Serializable;

/**
 * The <code>Rectangle2D</code> class describes a rectangle defined by a
 * location {@code (x,y)} and dimension {@code (w x h)}.
 * <p>
 * This class is only the abstract superclass for all objects that store a 2D
 * rectangle. The actual storage representation of the coordinates is left to
 * the subclass.
 * 
 * @author Jim Graham
 * @since 1.2
 */
public abstract class Rectangle2D extends RectangularShape {
	/**
	 * The bitmask that indicates that a point lies to the left of this
	 * <code>Rectangle2D</code>.
	 * 
	 * @since 1.2
	 */
	public static final int OUT_LEFT = 1;

	/**
	 * The bitmask that indicates that a point lies above this
	 * <code>Rectangle2D</code>.
	 * 
	 * @since 1.2
	 */
	public static final int OUT_TOP = 2;

	/**
	 * The bitmask that indicates that a point lies to the right of this
	 * <code>Rectangle2D</code>.
	 * 
	 * @since 1.2
	 */
	public static final int OUT_RIGHT = 4;

	/**
	 * The bitmask that indicates that a point lies below this
	 * <code>Rectangle2D</code>.
	 * 
	 * @since 1.2
	 */
	public static final int OUT_BOTTOM = 8;

	/**
	 * The <code>Float</code> class defines a rectangle specified in float
	 * coordinates.
	 * 
	 * @since 1.2
	 */
	public static class Float extends Rectangle2D implements Serializable {
		/**
		 * The X coordinate of this <code>Rectangle2D</code>.
		 * 
		 * @since 1.2
		 * @serial
		 */
		public float x;

		/**
		 * The Y coordinate of this <code>Rectangle2D</code>.
		 * 
		 * @since 1.2
		 * @serial
		 */
		public float y;

		/**
		 * The width of this <code>Rectangle2D</code>.
		 * 
		 * @since 1.2
		 * @serial
		 */
		public float width;

		/**
		 * The height of this <code>Rectangle2D</code>.
		 * 
		 * @since 1.2
		 * @serial
		 */
		public float height;

		/**
		 * Constructs a new <code>Rectangle2D</code>, initialized to location
		 * (0.0,&nbsp;0.0) and size (0.0,&nbsp;0.0).
		 * 
		 * @since 1.2
		 */
		public Float() {
		}

		/**
		 * Constructs and initializes a <code>Rectangle2D</code> from the
		 * specified <code>float</code> coordinates.
		 * 
		 * @param x
		 *            the X coordinate of the upper-left corner of the newly
		 *            constructed <code>Rectangle2D</code>
		 * @param y
		 *            the Y coordinate of the upper-left corner of the newly
		 *            constructed <code>Rectangle2D</code>
		 * @param w
		 *            the width of the newly constructed
		 *            <code>Rectangle2D</code>
		 * @param h
		 *            the height of the newly constructed
		 *            <code>Rectangle2D</code>
		 * @since 1.2
		 */
		public Float(float x, float y, float w, float h) {
			setRect(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 <= 0.0f) || (height <= 0.0f);
		}

		/**
		 * Sets the location and size of this <code>Rectangle2D</code> to the
		 * specified <code>float</code> values.
		 * 
		 * @param x
		 *            the X coordinate of the upper-left corner of this
		 *            <code>Rectangle2D</code>
		 * @param y
		 *            the Y coordinate of the upper-left corner of this
		 *            <code>Rectangle2D</code>
		 * @param w
		 *            the width of this <code>Rectangle2D</code>
		 * @param h
		 *            the height of this <code>Rectangle2D</code>
		 * @since 1.2
		 */
		public void setRect(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 setRect(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 void setRect(Rectangle2D r) {
			this.x = (float) r.getX();
			this.y = (float) r.getY();
			this.width = (float) r.getWidth();
			this.height = (float) r.getHeight();
		}

		/**
		 * {@inheritDoc}
		 * 
		 * @since 1.2
		 */
		public int outcode(double x, double y) {
			/*
			 * Note on casts to double below. If the arithmetic of x+w or y+h is
			 * done in float, then some bits may be lost if the binary exponents
			 * of x/y and w/h are not similar. By converting to double before
			 * the addition we force the addition to be carried out in double to
			 * avoid rounding error in the comparison.
			 * 
			 * See bug 4320890 for problems that this inaccuracy causes.
			 */
			int out = 0;
			if (this.width <= 0) {
				out |= OUT_LEFT | OUT_RIGHT;
			} else if (x < this.x) {
				out |= OUT_LEFT;
			} else if (x > this.x + (double) this.width) {
				out |= OUT_RIGHT;
			}
			if (this.height <= 0) {
				out |= OUT_TOP | OUT_BOTTOM;
			} else if (y < this.y) {
				out |= OUT_TOP;
			} else if (y > this.y + (double) this.height) {
				out |= OUT_BOTTOM;
			}
			return out;
		}

		/**
		 * {@inheritDoc}
		 * 
		 * @since 1.2
		 */
		public Rectangle2D getBounds2D() {
			return new Float(x, y, width, height);
		}

		/**
		 * {@inheritDoc}
		 * 
		 * @since 1.2
		 */
		public Rectangle2D createIntersection(Rectangle2D r) {
			Rectangle2D dest;
			if (r instanceof Float) {
				dest = new Rectangle2D.Float();
			} else {
				dest = new Rectangle2D.Double();
			}
			Rectangle2D.intersect(this, r, dest);
			return dest;
		}

		/**
		 * {@inheritDoc}
		 * 
		 * @since 1.2
		 */
		public Rectangle2D createUnion(Rectangle2D r) {
			Rectangle2D dest;
			if (r instanceof Float) {
				dest = new Rectangle2D.Float();
			} else {
				dest = new Rectangle2D.Double();
			}
			Rectangle2D.union(this, r, dest);
			return dest;
		}

		/**
		 * Returns the <code>String</code> representation of this
		 * <code>Rectangle2D</code>.
		 * 
		 * @return a <code>String</code> representing this
		 *         <code>Rectangle2D</code>.
		 * @since 1.2
		 */
		public String toString() {
			return getClass().getName() + "[x=" + x + ",y=" + y + ",w=" + width
					+ ",h=" + height + "]";
		}

		/*
		 * JDK 1.6 serialVersionUID
		 */
		private static final long serialVersionUID = 3798716824173675777L;
	}

	/**
	 * The <code>Double</code> class defines a rectangle specified in double
	 * coordinates.
	 * 
	 * @since 1.2
	 */
	public static class Double extends Rectangle2D implements Serializable {
		/**
		 * The X coordinate of this <code>Rectangle2D</code>.
		 * 
		 * @since 1.2
		 * @serial
		 */
		public double x;

		/**
		 * The Y coordinate of this <code>Rectangle2D</code>.
		 * 
		 * @since 1.2
		 * @serial
		 */
		public double y;

		/**
		 * The width of this <code>Rectangle2D</code>.
		 * 
		 * @since 1.2
		 * @serial
		 */
		public double width;

		/**
		 * The height of this <code>Rectangle2D</code>.
		 * 
		 * @since 1.2
		 * @serial
		 */
		public double height;

		/**
		 * Constructs a new <code>Rectangle2D</code>, initialized to location
		 * (0,&nbsp;0) and size (0,&nbsp;0).
		 * 
		 * @since 1.2
		 */
		public Double() {
		}

		/**
		 * Constructs and initializes a <code>Rectangle2D</code> from the
		 * specified <code>double</code> coordinates.
		 * 
		 * @param x
		 *            the X coordinate of the upper-left corner of the newly
		 *            constructed <code>Rectangle2D</code>
		 * @param y
		 *            the Y coordinate of the upper-left corner of the newly
		 *            constructed <code>Rectangle2D</code>
		 * @param w
		 *            the width of the newly constructed
		 *            <code>Rectangle2D</code>
		 * @param h
		 *            the height of the newly constructed
		 *            <code>Rectangle2D</code>
		 * @since 1.2
		 */
		public Double(double x, double y, double w, double h) {
			setRect(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 setRect(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 void setRect(Rectangle2D r) {
			this.x = r.getX();
			this.y = r.getY();
			this.width = r.getWidth();
			this.height = r.getHeight();
		}

		/**
		 * {@inheritDoc}
		 * 
		 * @since 1.2
		 */
		public int outcode(double x, double y) {
			int out = 0;
			if (this.width <= 0) {
				out |= OUT_LEFT | OUT_RIGHT;
			} else if (x < this.x) {
				out |= OUT_LEFT;
			} else if (x > this.x + this.width) {
				out |= OUT_RIGHT;
			}
			if (this.height <= 0) {
				out |= OUT_TOP | OUT_BOTTOM;
			} else if (y < this.y) {
				out |= OUT_TOP;
			} else if (y > this.y + this.height) {
				out |= OUT_BOTTOM;
			}
			return out;
		}

		/**
		 * {@inheritDoc}
		 * 
		 * @since 1.2
		 */
		public Rectangle2D getBounds2D() {
			return new Double(x, y, width, height);
		}

		/**
		 * {@inheritDoc}
		 * 
		 * @since 1.2
		 */
		public Rectangle2D createIntersection(Rectangle2D r) {
			Rectangle2D dest = new Rectangle2D.Double();
			Rectangle2D.intersect(this, r, dest);
			return dest;
		}

		/**
		 * {@inheritDoc}
		 * 
		 * @since 1.2
		 */
		public Rectangle2D createUnion(Rectangle2D r) {
			Rectangle2D dest = new Rectangle2D.Double();
			Rectangle2D.union(this, r, dest);
			return dest;
		}

		/**
		 * Returns the <code>String</code> representation of this
		 * <code>Rectangle2D</code>.
		 * 
		 * @return a <code>String</code> representing this
		 *         <code>Rectangle2D</code>.
		 * @since 1.2
		 */
		public String toString() {
			return getClass().getName() + "[x=" + x + ",y=" + y + ",w=" + width
					+ ",h=" + height + "]";
		}

		/*
		 * JDK 1.6 serialVersionUID
		 */
		private static final long serialVersionUID = 7771313791441850493L;
	}

	/**
	 * 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 and.awt.geom.Rectangle2D.Float
	 * @see and.awt.geom.Rectangle2D.Double
	 * @see net.pbdavey.awt.Rectangle
	 * @since 1.2
	 */
	protected Rectangle2D() {
	}

	/**
	 * Sets the location and size of this <code>Rectangle2D</code> to the
	 * specified <code>double</code> values.
	 * 
	 * @param x
	 *            the X coordinate of the upper-left corner of this
	 *            <code>Rectangle2D</code>
	 * @param y
	 *            the Y coordinate of the upper-left corner of this
	 *            <code>Rectangle2D</code>
	 * @param w
	 *            the width of this <code>Rectangle2D</code>
	 * @param h
	 *            the height of this <code>Rectangle2D</code>
	 * @since 1.2
	 */
	public abstract void setRect(double x, double y, double w, double h);

	/**
	 * Sets this <code>Rectangle2D</code> to be the same as the specified
	 * <code>Rectangle2D</code>.
	 * 
	 * @param r
	 *            the specified <code>Rectangle2D</code>
	 * @since 1.2
	 */
	public void setRect(Rectangle2D r) {
		setRect(r.getX(), r.getY(), r.getWidth(), r.getHeight());
	}

	/**
	 * Tests if the specified line segment intersects the interior of this
	 * <code>Rectangle2D</code>.
	 * 
	 * @param x1
	 *            the X coordinate of the start point of the specified line
	 *            segment
	 * @param y1
	 *            the Y coordinate of the start point of the specified line
	 *            segment
	 * @param x2
	 *            the X coordinate of the end point of the specified line
	 *            segment
	 * @param y2
	 *            the Y coordinate of the end point of the specified line
	 *            segment
	 * @return <code>true</code> if the specified line segment intersects the
	 *         interior of this <code>Rectangle2D</code>; <code>false</code>
	 *         otherwise.
	 * @since 1.2
	 */
	public boolean intersectsLine(double x1, double y1, double x2, double y2) {
		int out1, out2;
		if ((out2 = outcode(x2, y2)) == 0) {
			return true;
		}
		while ((out1 = outcode(x1, y1)) != 0) {
			if ((out1 & out2) != 0) {
				return false;
			}
			if ((out1 & (OUT_LEFT | OUT_RIGHT)) != 0) {
				double x = getX();
				if ((out1 & OUT_RIGHT) != 0) {
					x += getWidth();
				}
				y1 = y1 + (x - x1) * (y2 - y1) / (x2 - x1);
				x1 = x;
			} else {
				double y = getY();
				if ((out1 & OUT_BOTTOM) != 0) {
					y += getHeight();
				}
				x1 = x1 + (y - y1) * (x2 - x1) / (y2 - y1);
				y1 = y;
			}
		}
		return true;
	}

	/**
	 * Tests if the specified line segment intersects the interior of this
	 * <code>Rectangle2D</code>.
	 * 
	 * @param l
	 *            the specified {@link Line2D} to test for intersection with the
	 *            interior of this <code>Rectangle2D</code>
	 * @return <code>true</code> if the specified <code>Line2D</code> intersects
	 *         the interior of this <code>Rectangle2D</code>; <code>false</code>
	 *         otherwise.
	 * @since 1.2
	 */
	public boolean intersectsLine(Line2D l) {
		return intersectsLine(l.getX1(), l.getY1(), l.getX2(), l.getY2());
	}

	/**
	 * Determines where the specified coordinates lie with respect to this
	 * <code>Rectangle2D</code>. This method computes a binary OR of the
	 * appropriate mask values indicating, for each side of this
	 * <code>Rectangle2D</code>, whether or not the specified coordinates are on
	 * the same side of the edge as the rest of this <code>Rectangle2D</code>.
	 * 
	 * @param x
	 *            the specified X coordinate
	 * @param y
	 *            the specified Y coordinate
	 * @return the logical OR of all appropriate out codes.
	 * @see #OUT_LEFT
	 * @see #OUT_TOP
	 * @see #OUT_RIGHT
	 * @see #OUT_BOTTOM
	 * @since 1.2
	 */
	public abstract int outcode(double x, double y);

	/**
	 * Determines where the specified {@link Point2D} lies with respect to this
	 * <code>Rectangle2D</code>. This method computes a binary OR of the
	 * appropriate mask values indicating, for each side of this
	 * <code>Rectangle2D</code>, whether or not the specified
	 * <code>Point2D</code> is on the same side of the edge as the rest of this
	 * <code>Rectangle2D</code>.
	 * 
	 * @param p
	 *            the specified <code>Point2D</code>
	 * @return the logical OR of all appropriate out codes.
	 * @see #OUT_LEFT
	 * @see #OUT_TOP
	 * @see #OUT_RIGHT
	 * @see #OUT_BOTTOM
	 * @since 1.2
	 */
	public int outcode(Point2D p) {
		return outcode(p.getX(), p.getY());
	}

	/**
	 * Sets the location and size of the outer bounds of this
	 * <code>Rectangle2D</code> to the specified rectangular values.
	 * 
	 * @param x
	 *            the X coordinate of the upper-left corner of this
	 *            <code>Rectangle2D</code>
	 * @param y
	 *            the Y coordinate of the upper-left corner of this
	 *            <code>Rectangle2D</code>
	 * @param w
	 *            the width of this <code>Rectangle2D</code>
	 * @param h
	 *            the height of this <code>Rectangle2D</code>
	 * @since 1.2
	 */
	public void setFrame(double x, double y, double w, double h) {
		setRect(x, y, w, h);
	}

	/**
	 * {@inheritDoc}
	 * 
	 * @since 1.2
	 */
	public Rectangle2D getBounds2D() {
		return (Rectangle2D) clone();
	}

	/**
	 * {@inheritDoc}
	 * 
	 * @since 1.2
	 */
	public boolean contains(double x, double y) {
		double x0 = getX();
		double y0 = getY();
		return (x >= x0 && y >= y0 && x < x0 + getWidth() && y < y0
				+ getHeight());
	}

	/**
	 * {@inheritDoc}
	 * 
	 * @since 1.2
	 */
	public boolean intersects(double x, double y, double w, double h) {
		if (isEmpty() || w <= 0 || h <= 0) {
			return false;
		}
		double x0 = getX();
		double y0 = getY();
		return (x + w > x0 && y + h > y0 && x < x0 + getWidth() && y < y0
				+ getHeight());
	}

	/**
	 * {@inheritDoc}
	 * 
	 * @since 1.2
	 */
	public boolean contains(double x, double y, double w, double h) {
		if (isEmpty() || w <= 0 || h <= 0) {
			return false;
		}
		double x0 = getX();
		double y0 = getY();
		return (x >= x0 && y >= y0 && (x + w) <= x0 + getWidth() && (y + h) <= y0
				+ getHeight());
	}

	/**
	 * Returns a new <code>Rectangle2D</code> object representing the
	 * intersection of this <code>Rectangle2D</code> with the specified
	 * <code>Rectangle2D</code>.
	 * 
	 * @param r
	 *            the <code>Rectangle2D</code> to be intersected with this
	 *            <code>Rectangle2D</code>
	 * @return the largest <code>Rectangle2D</code> contained in both the
	 *         specified <code>Rectangle2D</code> and in this
	 *         <code>Rectangle2D</code>.
	 * @since 1.2
	 */
	public abstract Rectangle2D createIntersection(Rectangle2D r);

	/**
	 * Intersects the pair of specified source <code>Rectangle2D</code> objects
	 * and puts the result into the specified destination
	 * <code>Rectangle2D</code> object. One of the source rectangles can also be
	 * the destination to avoid creating a third Rectangle2D object, but in this
	 * case the original points of this source rectangle will be overwritten by
	 * this method.
	 * 
	 * @param src1
	 *            the first of a pair of <code>Rectangle2D</code> objects to be
	 *            intersected with each other
	 * @param src2
	 *            the second of a pair of <code>Rectangle2D</code> objects to be
	 *            intersected with each other
	 * @param dest
	 *            the <code>Rectangle2D</code> that holds the results of the
	 *            intersection of <code>src1</code> and <code>src2</code>
	 * @since 1.2
	 */
	public static void intersect(Rectangle2D src1, Rectangle2D src2,
			Rectangle2D dest) {
		double x1 = Math.max(src1.getMinX(), src2.getMinX());
		double y1 = Math.max(src1.getMinY(), src2.getMinY());
		double x2 = Math.min(src1.getMaxX(), src2.getMaxX());
		double y2 = Math.min(src1.getMaxY(), src2.getMaxY());
		dest.setFrame(x1, y1, x2 - x1, y2 - y1);
	}

	/**
	 * Returns a new <code>Rectangle2D</code> object representing the union of
	 * this <code>Rectangle2D</code> with the specified <code>Rectangle2D</code>
	 * .
	 * 
	 * @param r
	 *            the <code>Rectangle2D</code> to be combined with this
	 *            <code>Rectangle2D</code>
	 * @return the smallest <code>Rectangle2D</code> containing both the
	 *         specified <code>Rectangle2D</code> and this
	 *         <code>Rectangle2D</code>.
	 * @since 1.2
	 */
	public abstract Rectangle2D createUnion(Rectangle2D r);

	/**
	 * Unions the pair of source <code>Rectangle2D</code> objects and puts the
	 * result into the specified destination <code>Rectangle2D</code> object.
	 * One of the source rectangles can also be the destination to avoid
	 * creating a third Rectangle2D object, but in this case the original points
	 * of this source rectangle will be overwritten by this method.
	 * 
	 * @param src1
	 *            the first of a pair of <code>Rectangle2D</code> objects to be
	 *            combined with each other
	 * @param src2
	 *            the second of a pair of <code>Rectangle2D</code> objects to be
	 *            combined with each other
	 * @param dest
	 *            the <code>Rectangle2D</code> that holds the results of the
	 *            union of <code>src1</code> and <code>src2</code>
	 * @since 1.2
	 */
	public static void union(Rectangle2D src1, Rectangle2D src2,
			Rectangle2D dest) {
		double x1 = Math.min(src1.getMinX(), src2.getMinX());
		double y1 = Math.min(src1.getMinY(), src2.getMinY());
		double x2 = Math.max(src1.getMaxX(), src2.getMaxX());
		double y2 = Math.max(src1.getMaxY(), src2.getMaxY());
		dest.setFrameFromDiagonal(x1, y1, x2, y2);
	}

	/**
	 * Adds a point, specified by the double precision arguments
	 * <code>newx</code> and <code>newy</code>, to this <code>Rectangle2D</code>
	 * . The resulting <code>Rectangle2D</code> is the smallest
	 * <code>Rectangle2D</code> that contains both the original
	 * <code>Rectangle2D</code> and the specified point.
	 * <p>
	 * After adding a point, a call to <code>contains</code> with the added
	 * point as an argument does not necessarily return <code>true</code>. The
	 * <code>contains</code> method does not return <code>true</code> for points
	 * on the right or bottom edges of a rectangle. Therefore, if the added
	 * point falls on the left or bottom edge of the enlarged rectangle,
	 * <code>contains</code> returns <code>false</code> for that point.
	 * 
	 * @param newx
	 *            the X coordinate of the new point
	 * @param newy
	 *            the Y coordinate of the new point
	 * @since 1.2
	 */
	public void add(double newx, double newy) {
		double x1 = Math.min(getMinX(), newx);
		double x2 = Math.max(getMaxX(), newx);
		double y1 = Math.min(getMinY(), newy);
		double y2 = Math.max(getMaxY(), newy);
		setRect(x1, y1, x2 - x1, y2 - y1);
	}

	/**
	 * Adds the <code>Point2D</code> object <code>pt</code> to this
	 * <code>Rectangle2D</code>. The resulting <code>Rectangle2D</code> is the
	 * smallest <code>Rectangle2D</code> that contains both the original
	 * <code>Rectangle2D</code> and the specified <code>Point2D</code>.
	 * <p>
	 * After adding a point, a call to <code>contains</code> with the added
	 * point as an argument does not necessarily return <code>true</code>. The
	 * <code>contains</code> method does not return <code>true</code> for points
	 * on the right or bottom edges of a rectangle. Therefore, if the added
	 * point falls on the left or bottom edge of the enlarged rectangle,
	 * <code>contains</code> returns <code>false</code> for that point.
	 * 
	 * @param pt
	 *            the new <code>Point2D</code> to add to this
	 *            <code>Rectangle2D</code>.
	 * @since 1.2
	 */
	public void add(Point2D pt) {
		add(pt.getX(), pt.getY());
	}

	/**
	 * Adds a <code>Rectangle2D</code> object to this <code>Rectangle2D</code>.
	 * The resulting <code>Rectangle2D</code> is the union of the two
	 * <code>Rectangle2D</code> objects.
	 * 
	 * @param r
	 *            the <code>Rectangle2D</code> to add to this
	 *            <code>Rectangle2D</code>.
	 * @since 1.2
	 */
	public void add(Rectangle2D r) {
		double x1 = Math.min(getMinX(), r.getMinX());
		double x2 = Math.max(getMaxX(), r.getMaxX());
		double y1 = Math.min(getMinY(), r.getMinY());
		double y2 = Math.max(getMaxY(), r.getMaxY());
		setRect(x1, y1, x2 - x1, y2 - y1);
	}

	/**
	 * Returns an iteration object that defines the boundary of this
	 * <code>Rectangle2D</code>. The iterator for this class is multi-threaded
	 * safe, which means that this <code>Rectangle2D</code> class guarantees
	 * that modifications to the geometry of this <code>Rectangle2D</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>Rectangle2D</code>, one segment at a
	 *         time.
	 * @since 1.2
	 */
	public PathIterator getPathIterator(AffineTransform at) {
		return new RectIterator(this, at);
	}

	/**
	 * Returns an iteration object that defines the boundary of the flattened
	 * <code>Rectangle2D</code>. Since rectangles are already flat, the
	 * <code>flatness</code> parameter is ignored. The iterator for this class
	 * is multi-threaded safe, which means that this <code>Rectangle2D</code>
	 * class guarantees that modifications to the geometry of this
	 * <code>Rectangle2D</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
	 * @param flatness
	 *            the maximum distance that the line segments used to
	 *            approximate the curved segments are allowed to deviate from
	 *            any point on the original curve. Since rectangles are already
	 *            flat, the <code>flatness</code> parameter is ignored.
	 * @return the <code>PathIterator</code> object that returns the geometry of
	 *         the outline of this <code>Rectangle2D</code>, one segment at a
	 *         time.
	 * @since 1.2
	 */
	public PathIterator getPathIterator(AffineTransform at, double flatness) {
		return new RectIterator(this, at);
	}

	/**
	 * Returns the hashcode for this <code>Rectangle2D</code>.
	 * 
	 * @return the hashcode for this <code>Rectangle2D</code>.
	 * @since 1.2
	 */
	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>Rectangle2D</code>. The specified <code>Object</code> is equal
	 * to this <code>Rectangle2D</code> if it is an instance of
	 * <code>Rectangle2D</code> and if its location and size are the same as
	 * this <code>Rectangle2D</code>.
	 * 
	 * @param obj
	 *            an <code>Object</code> to be compared with this
	 *            <code>Rectangle2D</code>.
	 * @return <code>true</code> if <code>obj</code> is an instance of
	 *         <code>Rectangle2D</code> and has the same values;
	 *         <code>false</code> otherwise.
	 * @since 1.2
	 */
	public boolean equals(Object obj) {
		if (obj == this) {
			return true;
		}
		if (obj instanceof Rectangle2D) {
			Rectangle2D r2d = (Rectangle2D) obj;
			return ((getX() == r2d.getX()) && (getY() == r2d.getY())
					&& (getWidth() == r2d.getWidth()) && (getHeight() == r2d
					.getHeight()));
		}
		return false;
	}
}