예제 #1
0
  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);
  }
예제 #2
0
 /**
  * Compute the view range footprint on the globe.
  *
  * @param dc the current <code>DrawContext</code>
  * @param steps the number of steps.
  * @return an array list of <code>LatLon</code> forming a closed shape.
  */
 protected ArrayList<LatLon> computeViewFootPrint(DrawContext dc, int steps) {
   ArrayList<LatLon> positions = new ArrayList<LatLon>();
   Position eyePos = dc.getView().getEyePosition();
   Angle distance =
       Angle.fromRadians(
           Math.asin(
               dc.getView().getFarClipDistance()
                   / (dc.getGlobe().getRadius() + eyePos.getElevation())));
   if (distance.degrees > 10) {
     double headStep = 360d / steps;
     Angle heading = Angle.ZERO;
     for (int i = 0; i <= steps; i++) {
       LatLon p = LatLon.greatCircleEndPosition(eyePos, heading, distance);
       positions.add(p);
       heading = heading.addDegrees(headStep);
     }
     return positions;
   } else return null;
 }
  /** {@inheritDoc} */
  @Override
  protected void determineLabelPositions(DrawContext dc) {
    Position center = this.getReferencePosition();
    if (center == null) return;

    // Position the labels along a line radiating out from the center of the circle. The angle (60
    // degrees) is
    // chosen to match the graphic template defined by MIL-STD-2525C, pg. 613.
    double globeRadius = dc.getGlobe().getRadius();

    Angle labelAngle = this.getLabelAngle();

    int i = 0;
    for (SurfaceCircle ring : this.rings) {
      double radius = ring.getRadius();

      LatLon ll = LatLon.greatCircleEndPosition(center, labelAngle.radians, radius / globeRadius);

      this.labels.get(i).setPosition(new Position(ll, 0));
      i += 1;
    }
  }