/**
 * A class representing arcs of BoundaryCircles which contribute to the
 * boundary of a fundamental domain.
 *
 * @author Jonathan A. Poritz
 * @version 1.7, 17 Sep 1998
 */

public class BoundaryArc extends BoundaryCircle {

  /**
   * The starting angle of the arc on this boundary circle.
   */
  double start;
  /**
   * The ending angle of the arc on this boundary circle.
   */
  double end;

  /**
   * Constructor for non-trivial BoundaryArcs.
   *
   * @param z11        the (1,1) entry of the current trace's generator matrix
   * @param dist       the current axis distance
   * @param ndx        the index of this BoundaryCircle
   * @param domaintype the selected index of <b>outputpanel</b>'s
   *                   Choice <b>fordordirichlet</b>
   * @param a          starting angle of this arc
   * @param b          ending angle of this arc
   */
  public BoundaryArc(Complex z11, double dist, int ndx, int domaintype, double a, double b) {
    super(z11, dist, ndx, domaintype);
    start = a;
    end = b;
  }

  /**
   * Constructor for trivial BoundaryArcs.
   */
  public BoundaryArc() {
    super();
    start = 0D;
    end = 0D;
  }

  /**
   * Makes a negative BoundaryArc corresponding to the input of a
   * positive one.
   *
   * @param pos the positive BoundaryArc to be copied and negated
   * @returns the new negative BoundaryArc
   */
  public static BoundaryArc makeNeg(BoundaryArc pos) {
    // copy the input BoundaryArc
    BoundaryArc neg = pos.copyArc();
    // make the index negative and take one minus the center
    neg.index = -pos.index;
    neg.cen = Complex.subtract(Complex.ONE, pos.cen);
    return neg;
  }

  /**
   * Copies this BoundaryArc, by making a trivial BoundaryArc and
   * then copying into it this's center, radius, index, start and end
   */
  public BoundaryArc copyArc() {
    BoundaryArc x = new BoundaryArc();
    x.cen.x = this.cen.x;
    x.cen.y = this.cen.y;
    x.rad = this.rad;
    x.index = this.index;
    x.start = this.start;
    x.end = this.end;
    return x;
  }

}