trunk/libjava/classpath/gnu/java/awt/java2d/LineSegment.java

   1 /* LineSegment.java -- Line segment used for BasicStroke
   2    Copyright (C) 2006 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38
  39 package gnu.java.awt.java2d;
  40
  41
  42 import java.awt.geom.Point2D;
  43
  44 public class LineSegment extends Segment
  45 {
  46   public LineSegment(double x1, double y1, double x2, double y2)
  47   {
  48     super();
  49     P1 = new Point2D.Double(x1, y1);
  50     P2 = new Point2D.Double(x2, y2);
  51   }
  52
  53   public LineSegment(Point2D p1, Point2D p2)
  54   {
  55     super();
  56     P1 = (Point2D) p1.clone();
  57     P2 = (Point2D) p2.clone();
  58   }
  59
  60   /**
  61    * Clones this segment
  62    */
  63   public Object clone()
  64   {
  65     LineSegment segment = null;
  66
  67     try
  68       {
  69         segment = (LineSegment) super.clone();
  70         segment.P1 = (Point2D) P1.clone();
  71         segment.P2 = (Point2D) P2.clone();
  72       }
  73     catch (CloneNotSupportedException cnse)
  74       {
  75         InternalError ie = new InternalError();
  76         ie.initCause(cnse);
  77         throw ie;
  78       }
  79
  80     return segment;
  81   }
  82
  83   /**
  84    * Get the "top" and "bottom" segments of this segment.
  85    * First array element is p0 + normal, second is p0 - normal.
  86    */
  87   public Segment[] getDisplacedSegments(double radius)
  88   {
  89     this.radius = radius;
  90     double x0 = P1.getX();
  91     double y0 = P1.getY();
  92     double x1 = P2.getX();
  93     double y1 = P2.getY();
  94     double[] p = normal(x0, y0, x1, y1);
  95     Segment s1 = (new LineSegment(x0 + p[0], y0 + p[1],
  96                                   x1 + p[0], y1 + p[1] ));
  97     Segment s2 = (new LineSegment(x0 - p[0], y0 - p[1],
  98                                   x1 - p[0], y1 - p[1] ));
  99     return new Segment[]{s1, s2};
 100   }
 101
 102   public void reverse()
 103   {
 104     Point2D p = P1;
 105     P1 = P2;
 106     P2 = p;
 107   }
 108
 109   public double[] cp1()
 110   {
 111     return new double[]{P2.getX(), P2.getY()};
 112   }
 113
 114   public double[] cp2()
 115   {
 116     return new double[]{P1.getX(), P1.getY()};
 117   }
 118 } // class LineSegment