Name: wl91122 Date: 09/08/99


import java.awt.geom.*;
/**
 * This program demonstrates an inconsistency between the
 * documentation and the implementation of java.awt.geom.Line2D
 * in JDK 1.2.2.
 *
 * Specifically, the relativeCCW() method returns the negative
 * value of what it should return.
 *
 * Bill Farrior
 * September 7, 1999
 * ###@###.###
 */
public class LineBug {

  public static void main(String args[])
  {
    System.out.println("Consider a line segment from p0 (0,0) to p1 (1,0).\n"+
    "A point P lies at (0,2).\n\n" +
    "For the line segment to \"point at\" the specified point, it must turn\n"+
    "counterclockwise 90 degrees about its first point at the origin.\n"+
    "According to the documention on Class java.awt.geom.Line2D, the\n"+
    "relativeCCW() method should rightfully return a postive 1 in this\n"+
    "situation."
    );

    System.out.println("\nHowever, the actual value returned is as follows:");

    // Define p0
    Point2D.Double p0 = new Point2D.Double(0,0);
    System.out.println("p0 = " + p0);

    // Define p1
    Point2D.Double p1 = new Point2D.Double(1,0);
    System.out.println("p1 = " + p1);

    // Define a line from p0 to p1
    Line2D.Double line = new Line2D.Double(p0,p1);
    System.out.println("line created from p0 to p1.");

    // Define p
    Point2D.Double p = new Point2D.Double(0,2);
    System.out.println("p = " + p);

    // Print the flawed result
    System.out.println("line.relativeCCW(p) = " + line.relativeCCW(p) );
  }
}
(Review ID: 94985)
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