/**
   * {@inheritDoc}
   *
   * @param positions Control points. This graphic uses only two control point, which determine the
   *     midpoints of two opposite sides of the quad. See Fire Support Area (2.X.4.3.2.1.2) on pg.
   *     652 of MIL-STD-2525C for an example of how these points are interpreted.
   */
  public void setPositions(Iterable<? extends Position> positions) {
    if (positions == null) {
      String message = Logging.getMessage("nullValue.PositionsListIsNull");
      Logging.logger().severe(message);
      throw new IllegalArgumentException(message);
    }

    Iterator<? extends Position> iterator = positions.iterator();
    try {
      Position pos1 = iterator.next();
      Position pos2 = iterator.next();

      LatLon center = LatLon.interpolateGreatCircle(0.5, pos1, pos2);
      this.quad.setCenter(center);

      Angle heading = LatLon.greatCircleAzimuth(pos2, pos1);
      this.quad.setHeading(heading.subtract(Angle.POS90));

      this.positions = positions;
      this.shapeInvalid = true; // Need to recompute quad size
    } catch (NoSuchElementException e) {
      String message = Logging.getMessage("generic.InsufficientPositions");
      Logging.logger().severe(message);
      throw new IllegalArgumentException(message);
    }
  }
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  protected List<Position> computePathPositions(
      Position startPosition, Position endPosition, Angle delta) {
    Angle dist = LatLon.greatCircleDistance(startPosition, endPosition);
    dist = dist.multiply(0.6);

    Angle azimuth = LatLon.greatCircleAzimuth(startPosition, endPosition);

    LatLon locA = LatLon.greatCircleEndPosition(startPosition, azimuth.add(delta), dist);

    dist = dist.multiply(0.9);
    LatLon locB = LatLon.greatCircleEndPosition(startPosition, azimuth.subtract(delta), dist);

    return Arrays.asList(startPosition, new Position(locA, 0), new Position(locB, 0), endPosition);
  }
  protected double[] computeAngles() {
    // Compute the start and sweep angles such that the partial cylinder shape tranverses a
    // clockwise path from
    // the start angle to the stop angle.
    Angle startAngle, stopAngle, sweepAngle;
    startAngle = normalizedAzimuth(this.leftAzimuth);
    stopAngle = normalizedAzimuth(this.rightAzimuth);

    int i = startAngle.compareTo(stopAngle);
    // Angles are equal, fallback to building a closed cylinder.
    if (i == 0) return null;

    if (i < 0) sweepAngle = stopAngle.subtract(startAngle);
    else // (i > 0)
    sweepAngle = Angle.POS360.subtract(startAngle).add(stopAngle);

    double[] array = new double[3];
    array[0] = startAngle.radians;
    array[1] = stopAngle.radians;
    array[2] = sweepAngle.radians;
    return array;
  }
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  /**
   * Create the list of positions that describe the arrow.
   *
   * @param dc Current draw context.
   */
  protected void createShapes(DrawContext dc) {
    this.paths = new Path[2];

    int i = 0;

    Angle azimuth1 = LatLon.greatCircleAzimuth(this.position1, this.position2);
    Angle azimuth2 = LatLon.greatCircleAzimuth(this.position1, this.position3);

    Angle delta = azimuth2.subtract(azimuth1);
    int sign = delta.degrees > 0 ? 1 : -1;

    delta = Angle.fromDegrees(sign * 5.0);

    // Create a path for the line part of the arrow
    List<Position> positions = this.computePathPositions(this.position1, this.position2, delta);
    this.paths[i++] = this.createPath(positions);

    // Create a polygon to draw the arrow head.
    double arrowLength = this.getArrowLength();
    Angle arrowAngle = this.getArrowAngle();
    positions =
        this.computeArrowheadPositions(
            dc, positions.get(2), positions.get(3), arrowLength, arrowAngle);
    this.arrowHead1 = this.createPolygon(positions);
    this.arrowHead1.setLocations(positions);

    delta = delta.multiply(-1.0);
    positions = this.computePathPositions(this.position1, this.position3, delta);
    this.paths[i] = this.createPath(positions);

    positions =
        this.computeArrowheadPositions(
            dc, positions.get(2), positions.get(3), arrowLength, arrowAngle);
    this.arrowHead2 = this.createPolygon(positions);
    this.arrowHead2.setLocations(positions);
  }