Source for gnu.java.awt.java2d.LineSegment

   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