798 lines
18 KiB
Java
798 lines
18 KiB
Java
//******************************************************************************
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//
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// File: Ellipse.java
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// Package: edu.rit.draw.item
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// Unit: Class edu.rit.draw.item.Ellipse
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//
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// This Java source file is copyright (C) 2013 by Alan Kaminsky. All rights
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// reserved. For further information, contact the author, Alan Kaminsky, at
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// ark@cs.rit.edu.
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//
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// This Java source file is part of the Parallel Java 2 Library ("PJ2"). PJ2 is
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// free software; you can redistribute it and/or modify it under the terms of
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// the GNU General Public License as published by the Free Software Foundation;
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// either version 3 of the License, or (at your option) any later version.
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//
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// PJ2 is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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//
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// A copy of the GNU General Public License is provided in the file gpl.txt. You
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// may also obtain a copy of the GNU General Public License on the World Wide
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// Web at http://www.gnu.org/licenses/gpl.html.
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//
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//******************************************************************************
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package edu.rit.draw.item;
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import edu.rit.draw.Drawing;
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import java.awt.Shape;
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import java.awt.geom.Ellipse2D;
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/**
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* Class Ellipse provides an ellipse {@linkplain DrawingItem}. A circle is a
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* special case of an ellipse with equal width and height.
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* <P>
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* The static <TT>defaultSize()</TT>, <TT>defaultWidth()</TT>, and
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* <TT>defaultHeight()</TT> methods are provided to set the default size, width,
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* and height. If an ellipse's size, width, or height is not specified, the
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* current default size, width, or height is used.
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*
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* @author Alan Kaminsky
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* @version 23-Jun-2008
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*/
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public class Ellipse
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extends RectangularItem
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{
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// Exported constants.
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/**
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* The normal width for ellipses (72). <I>Note:</I> 72 points = 1 inch.
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*/
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public static final double NORMAL_WIDTH = 72.0;
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/**
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* The normal height for ellipses (72). <I>Note:</I> 72 points = 1 inch.
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*/
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public static final double NORMAL_HEIGHT = 72.0;
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// Hidden data members.
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private static final long serialVersionUID = 8085149752960383250L;
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private static double theDefaultWidth = NORMAL_WIDTH;
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private static double theDefaultHeight = NORMAL_HEIGHT;
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// Exported constructors.
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/**
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* Construct a new ellipse. The ellipse's northwest corner is located at
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* (0,0). The ellipse's size is the default size.
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*/
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public Ellipse()
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{
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super();
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this.width = theDefaultWidth;
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this.height = theDefaultHeight;
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}
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/**
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* Construct a new ellipse with the same outline, fill paint, location,
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* and size as the given ellipse.
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*
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* @param theItem Ellipse.
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*
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* @exception NullPointerException
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* (unchecked exception) Thrown if <TT>theItem</TT> is null.
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*/
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public Ellipse
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(Ellipse theItem)
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{
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super (theItem);
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}
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// Exported operations.
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/**
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* Returns the default size for ellipses.
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*
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* @return Default size.
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*/
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public static Size defaultSize()
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{
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return new Size (theDefaultWidth, theDefaultHeight);
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}
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/**
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* Set the default size for ellipses.
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*
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* @param theSize Default size.
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*
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* @exception IllegalArgumentException
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* (unchecked exception) Thrown if the width or the height of
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* <TT>theSize</TT> is less than 0.
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*/
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public static void defaultSize
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(Size theSize)
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{
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if (theSize.width < 0.0 || theSize.height < 0.0)
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{
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throw new IllegalArgumentException();
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}
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theDefaultWidth = theSize.width;
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theDefaultHeight = theSize.height;
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}
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/**
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* Returns the default width for ellipses.
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*
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* @return Default width.
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*/
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public static double defaultWidth()
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{
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return theDefaultWidth;
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}
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/**
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* Set the default width for ellipses.
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*
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* @param theWidth Default width.
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*
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* @exception IllegalArgumentException
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* (unchecked exception) Thrown if <TT>theWidth</TT> is less than 0.
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*/
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public static void defaultWidth
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(double theWidth)
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{
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if (theWidth < 0.0) throw new IllegalArgumentException();
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theDefaultWidth = theWidth;
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}
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/**
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* Returns the default height for ellipses.
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*
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* @return Default height.
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*/
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public static double defaultHeight()
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{
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return theDefaultHeight;
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}
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/**
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* Set the default height for ellipses.
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*
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* @param theHeight Default height.
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*
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* @exception IllegalArgumentException
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* (unchecked exception) Thrown if <TT>theHeight</TT> is less than 0.
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*/
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public static void defaultHeight
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(double theHeight)
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{
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if (theHeight < 0.0) throw new IllegalArgumentException();
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theDefaultHeight = theHeight;
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}
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/**
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* Set this ellipse's outline.
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*
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* @param theOutline Outline, or <TT>Outline.NONE</TT>.
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*
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* @return This ellipse.
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*/
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public Ellipse outline
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(Outline theOutline)
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{
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doOutline (theOutline);
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return this;
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}
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/**
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* Set this ellipse's fill paint.
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*
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* @param theFill Fill paint, or <TT>Fill.NONE</TT>.
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*
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* @return This ellipse.
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*/
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public Ellipse fill
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(Fill theFill)
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{
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doFill (theFill);
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return this;
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}
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/**
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* Set the size of this ellipse's bounding box.
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*
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* @param theSize Size.
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*
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* @return This ellipse.
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*
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* @exception IllegalArgumentException
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* (unchecked exception) Thrown if the width or the height of
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* <TT>theSize</TT> is less than 0.
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*/
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public Ellipse size
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(Size theSize)
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{
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doSize (theSize);
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return this;
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}
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/**
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* Set the width of this ellipse's bounding box.
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*
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* @param theWidth Width.
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*
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* @return This ellipse.
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*
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* @exception IllegalArgumentException
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* (unchecked exception) Thrown if <TT>theWidth</TT> is less than 0.
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*/
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public Ellipse width
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(double theWidth)
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{
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doWidth (theWidth);
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return this;
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}
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/**
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* Set the height of this ellipse's bounding box.
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*
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* @param theHeight Height.
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*
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* @return This ellipse.
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*
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* @exception IllegalArgumentException
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* (unchecked exception) Thrown if <TT>theHeight</TT> is less than 0.
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*/
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public Ellipse height
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(double theHeight)
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{
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doHeight (theHeight);
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return this;
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}
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/**
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* Set the width and height of this ellipse's bounding box to make this
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* ellipse a circle.
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*
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* @param theDiameter Diameter.
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*
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* @return This ellipse.
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*
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* @exception IllegalArgumentException
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* (unchecked exception) Thrown if <TT>theDiameter</TT> is less than 0.
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*/
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public Ellipse diameter
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(double theDiameter)
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{
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doWidth (theDiameter);
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doHeight (theDiameter);
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return this;
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}
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/**
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* Set the northwest corner point of this ellipse's bounding box.
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*
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* @param x X coordinate of northwest corner point.
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* @param y Y coordinate of northwest corner point.
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*
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* @return This ellipse.
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*/
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public Ellipse nw
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(double x,
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double y)
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{
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doNw (x, y);
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return this;
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}
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/**
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* Set the northwest corner point of this ellipse's bounding box.
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*
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* @param thePoint Northwest corner point.
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*
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* @return This ellipse.
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*
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* @exception NullPointerException
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* (unchecked exception) Thrown if <TT>thePoint</TT> is null.
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*/
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public Ellipse nw
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(Point thePoint)
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{
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doNw (thePoint.x, thePoint.y);
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return this;
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}
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/**
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* Set the north middle point of this ellipse's bounding box.
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*
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* @param x X coordinate of north middle point.
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* @param y Y coordinate of north middle point.
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*
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* @return This ellipse.
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*/
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public Ellipse n
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(double x,
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double y)
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{
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doN (x, y);
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return this;
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}
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/**
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* Set the north middle point of this ellipse's bounding box.
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*
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* @param thePoint North middle point.
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*
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* @return This ellipse.
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*
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* @exception NullPointerException
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* (unchecked exception) Thrown if <TT>thePoint</TT> is null.
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*/
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public Ellipse n
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(Point thePoint)
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{
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doN (thePoint.x, thePoint.y);
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return this;
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}
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/**
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* Set the northeast corner point of this ellipse's bounding box.
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*
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* @param x X coordinate of northeast corner point.
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* @param y Y coordinate of northeast corner point.
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*
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* @return This ellipse.
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*/
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public Ellipse ne
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(double x,
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double y)
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{
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doNe (x, y);
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return this;
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}
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/**
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* Set the northeast corner point of this ellipse's bounding box.
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*
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* @param thePoint Northeast corner point.
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*
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* @return This ellipse.
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*
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* @exception NullPointerException
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* (unchecked exception) Thrown if <TT>thePoint</TT> is null.
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*/
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public Ellipse ne
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(Point thePoint)
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{
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doNe (thePoint.x, thePoint.y);
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return this;
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}
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/**
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* Set the west middle point of this ellipse's bounding box.
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*
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* @param x X coordinate of west middle point.
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* @param y Y coordinate of west middle point.
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*
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* @return This ellipse.
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*/
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public Ellipse w
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(double x,
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double y)
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{
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doW (x, y);
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return this;
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}
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/**
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* Set the west middle point of this ellipse's bounding box.
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*
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* @param thePoint West middle point.
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*
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* @return This ellipse.
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*
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* @exception NullPointerException
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* (unchecked exception) Thrown if <TT>thePoint</TT> is null.
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*/
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public Ellipse w
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(Point thePoint)
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{
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doW (thePoint.x, thePoint.y);
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return this;
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}
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/**
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* Set the center point of this ellipse's bounding box.
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*
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* @param x X coordinate of center point.
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* @param y Y coordinate of center point.
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*
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* @return This ellipse.
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*/
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public Ellipse c
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(double x,
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double y)
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{
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doC (x, y);
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return this;
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}
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/**
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* Set the center point of this ellipse's bounding box.
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*
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* @param thePoint Center point.
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*
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* @return This ellipse.
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*
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* @exception NullPointerException
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* (unchecked exception) Thrown if <TT>thePoint</TT> is null.
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*/
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public Ellipse c
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(Point thePoint)
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{
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doC (thePoint.x, thePoint.y);
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return this;
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}
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/**
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* Set the east middle point of this ellipse's bounding box.
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*
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* @param x X coordinate of east middle point.
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* @param y Y coordinate of east middle point.
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*
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* @return This ellipse.
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*/
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public Ellipse e
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(double x,
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double y)
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{
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doE (x, y);
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return this;
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}
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/**
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* Set the east middle point of this ellipse's bounding box.
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*
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* @param thePoint East middle point.
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*
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* @return This ellipse.
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*
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* @exception NullPointerException
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* (unchecked exception) Thrown if <TT>thePoint</TT> is null.
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*/
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public Ellipse e
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(Point thePoint)
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{
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doE (thePoint.x, thePoint.y);
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return this;
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}
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/**
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* Set the southwest corner point of this ellipse's bounding box.
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*
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* @param x X coordinate of southwest corner point.
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* @param y Y coordinate of southwest corner point.
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*
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* @return This ellipse.
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*/
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public Ellipse sw
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(double x,
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double y)
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{
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doSw (x, y);
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return this;
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}
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/**
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* Set the southwest corner point of this ellipse's bounding box.
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*
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* @param thePoint Southwest corner point.
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*
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* @return This ellipse.
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*
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* @exception NullPointerException
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* (unchecked exception) Thrown if <TT>thePoint</TT> is null.
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*/
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public Ellipse sw
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(Point thePoint)
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{
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doSw (thePoint.x, thePoint.y);
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return this;
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}
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/**
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* Set the south middle point of this ellipse's bounding box.
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*
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* @param x X coordinate of south middle point.
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* @param y Y coordinate of south middle point.
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*
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* @return This ellipse.
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*/
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public Ellipse s
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(double x,
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double y)
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{
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doS (x, y);
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return this;
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}
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/**
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* Set the south middle point of this ellipse's bounding box.
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*
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* @param thePoint South middle point.
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*
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* @return This ellipse.
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*
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* @exception NullPointerException
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* (unchecked exception) Thrown if <TT>thePoint</TT> is null.
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*/
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public Ellipse s
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(Point thePoint)
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{
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doS (thePoint.x, thePoint.y);
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return this;
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}
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/**
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* Set the southeast corner point of this ellipse's bounding box.
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*
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* @param x X coordinate of southeast corner point.
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* @param y Y coordinate of southeast corner point.
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*
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* @return This ellipse.
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*/
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public Ellipse se
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(double x,
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double y)
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{
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doSe (x, y);
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return this;
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}
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/**
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* Set the southeast corner point of this ellipse's bounding box.
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*
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* @param thePoint Southeast corner point.
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*
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* @return This ellipse.
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*
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* @exception NullPointerException
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* (unchecked exception) Thrown if <TT>thePoint</TT> is null.
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*/
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public Ellipse se
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(Point thePoint)
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{
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doSe (thePoint.x, thePoint.y);
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return this;
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}
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/**
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* Add this ellipse to the end of the default drawing's sequence of drawing
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* items.
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*
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* @return This ellipse.
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*
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* @exception NullPointerException
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* (unchecked exception) Thrown if there is no default drawing.
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*
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* @see Drawing#defaultDrawing()
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*/
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public Ellipse add()
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{
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doAdd (Drawing.defaultDrawing());
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return this;
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}
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/**
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* Add this ellipse to the end of the given drawing's sequence of drawing
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* items.
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*
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* @param theDrawing Drawing.
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*
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* @return This ellipse.
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*
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* @exception NullPointerException
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* (unchecked exception) Thrown if <TT>theDrawing</TT> is null.
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*/
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public Ellipse add
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(Drawing theDrawing)
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{
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doAdd (theDrawing);
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return this;
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}
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/**
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* Add this ellipse to the beginning of the default drawing's sequence of
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* drawing items.
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*
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* @return This ellipse.
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*
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* @exception NullPointerException
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* (unchecked exception) Thrown if there is no default drawing.
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*
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* @see Drawing#defaultDrawing()
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*/
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public Ellipse addFirst()
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{
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doAddFirst (Drawing.defaultDrawing());
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return this;
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}
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|
|
|
/**
|
|
* Add this ellipse to the beginning of the given drawing's sequence of
|
|
* drawing items.
|
|
*
|
|
* @param theDrawing Drawing.
|
|
*
|
|
* @return This ellipse.
|
|
*
|
|
* @exception NullPointerException
|
|
* (unchecked exception) Thrown if <TT>theDrawing</TT> is null.
|
|
*/
|
|
public Ellipse addFirst
|
|
(Drawing theDrawing)
|
|
{
|
|
doAddFirst (theDrawing);
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Returns the point on the circumference of this ellipse at the given angle
|
|
* relative to this ellipse's center. The point on the ellipse's
|
|
* circumference is determined by <TT>angle</TT>, measured in radians. An
|
|
* angle of 0 gives the east point; an angle of pi/2 gives the south point;
|
|
* an angle of pi gives the west point; an angle of 3*pi/2 gives the north
|
|
* point.
|
|
*
|
|
* @param angle Angle (radians).
|
|
*
|
|
* @return Point on this ellipse's circumference.
|
|
*/
|
|
public Point circumferencePoint
|
|
(double angle)
|
|
{
|
|
Point c = c();
|
|
double xc = c.x;
|
|
double yc = c.y;
|
|
double xr = width() / 2;
|
|
double yr = height() / 2;
|
|
double x1 = xc + xr * Math.cos (angle);
|
|
double y1 = yc + yr * Math.sin (angle);
|
|
return new Point (x1, y1);
|
|
}
|
|
|
|
/**
|
|
* Returns the point on the circumference of this ellipse at the given angle
|
|
* relative to this ellipse's center. The point on the ellipse's
|
|
* circumference is determined by <TT>angle</TT>, measured in degrees. An
|
|
* angle of 0 gives the east point; an angle of 90 gives the south point;
|
|
* an angle of 180 gives the west point; an angle of 270 gives the north
|
|
* point.
|
|
*
|
|
* @param angle Angle (degrees).
|
|
*
|
|
* @return Point on this ellipse's circumference.
|
|
*/
|
|
public Point circumferencePointDegrees
|
|
(double angle)
|
|
{
|
|
return circumferencePoint (angle / 180.0 * Math.PI);
|
|
}
|
|
|
|
/**
|
|
* Returns the point on the circumference of this ellipse at the given angle
|
|
* relative to this ellipse's center, extended outward by the given length.
|
|
* First, a point on this ellipse's circumference is determined by
|
|
* <TT>angle</TT>, measured in radians. An angle of 0 gives the east point;
|
|
* an angle of pi/2 gives the south point; an angle of pi gives the west
|
|
* point; an angle of 3*pi/2 gives the north point. A line is projected from
|
|
* the center of this ellipse, through the point on the circumference, for a
|
|
* further distance of <TT>length</TT>; the endpoint of this line is
|
|
* returned.
|
|
*
|
|
* @param angle Angle (radians).
|
|
* @param length Length to extend from circumference.
|
|
*
|
|
* @return Point extended outward from this ellipse's circumference.
|
|
*/
|
|
public Point circumferencePoint
|
|
(double angle,
|
|
double length)
|
|
{
|
|
Point c = c();
|
|
double xc = c.x;
|
|
double yc = c.y;
|
|
double xr = width() / 2;
|
|
double yr = height() / 2;
|
|
double dx = xr * Math.cos (angle);
|
|
double dy = yr * Math.sin (angle);
|
|
double d = Math.sqrt (dx*dx + dy*dy);
|
|
double x1 = xc + dx + dx / d * length;
|
|
double y1 = yc + dy + dy / d * length;
|
|
return new Point (x1, y1);
|
|
}
|
|
|
|
/**
|
|
* Returns the point on the circumference of this ellipse at the given angle
|
|
* relative to this ellipse's center, extended outward by the given length.
|
|
* First, a point on this ellipse's circumference is determined by
|
|
* <TT>angle</TT>, measured in degrees. An angle of 0 gives the east point;
|
|
* an angle of 90 gives the south point; an angle of 180 gives the west
|
|
* point; an angle of 270 gives the north point. A line is projected from
|
|
* the center of this ellipse, through the point on the circumference, for a
|
|
* further distance of <TT>length</TT>; the endpoint of this line is
|
|
* returned.
|
|
*
|
|
* @param angle Angle (degrees).
|
|
* @param length Length to extend from circumference.
|
|
*
|
|
* @return Point extended outward from this ellipse's circumference.
|
|
*/
|
|
public Point circumferencePointDegrees
|
|
(double angle,
|
|
double length)
|
|
{
|
|
return circumferencePoint (angle / 180.0 * Math.PI, length);
|
|
}
|
|
|
|
/**
|
|
* Returns the point of intersection between (1) this ellipse's perimeter
|
|
* and (2) the line passing through this ellipse's center and the given
|
|
* point.
|
|
*
|
|
* @param point One point on the line.
|
|
*
|
|
* @return Point of intersection between perimeter and line.
|
|
*/
|
|
public Point perimeterIntersection
|
|
(Point point)
|
|
{
|
|
return perimeterIntersection (point.x, point.y);
|
|
}
|
|
|
|
/**
|
|
* Returns the point of intersection between (1) this ellipse's perimeter
|
|
* and (2) the line passing through this ellipse's center and the given
|
|
* point.
|
|
*
|
|
* @param x X coordinate of one point on the line.
|
|
* @param y Y coordinate of one point on the line.
|
|
*
|
|
* @return Point of intersection between perimeter and line.
|
|
*/
|
|
public Point perimeterIntersection
|
|
(double x,
|
|
double y)
|
|
{
|
|
Point center = c();
|
|
double cx = center.x;
|
|
double cy = center.y;
|
|
double w = width()/2;
|
|
double h = height()/2;
|
|
double dx = x - cx;
|
|
double dy = y - cy;
|
|
double d = Math.sqrt (dx*dx + dy*dy);
|
|
return new Point (cx + w*dx/d, cy + h*dy/d);
|
|
}
|
|
|
|
// Hidden operations.
|
|
|
|
/**
|
|
* Determine the 2-D graphics shape that this shape object will draw.
|
|
*
|
|
* @return Shape.
|
|
*/
|
|
Shape getShape()
|
|
{
|
|
Point nw = nw();
|
|
return new Ellipse2D.Double (nw.x, nw.y, width, height);
|
|
}
|
|
|
|
}
|