/**
   * Select the visible grid elements
   *
   * @param dc the current <code>DrawContext</code>.
   */
  protected void selectRenderables(DrawContext dc) {
    if (dc == null) {
      String message = Logging.getMessage("nullValue.DrawContextIsNull");
      Logging.logger().severe(message);
      throw new IllegalArgumentException(message);
    }
    Sector vs = dc.getVisibleSector();
    OrbitView view = (OrbitView) dc.getView();
    // Compute labels offset from view center
    Position centerPos = view.getCenterPosition();
    Double pixelSizeDegrees =
        Angle.fromRadians(
                view.computePixelSizeAtDistance(view.getZoom())
                    / dc.getGlobe().getEquatorialRadius())
            .degrees;
    Double labelOffsetDegrees = pixelSizeDegrees * view.getViewport().getWidth() / 4;
    Position labelPos =
        Position.fromDegrees(
            centerPos.getLatitude().degrees - labelOffsetDegrees,
            centerPos.getLongitude().degrees - labelOffsetDegrees,
            0);
    Double labelLatDegrees = labelPos.getLatitude().normalizedLatitude().degrees;
    labelLatDegrees = Math.min(Math.max(labelLatDegrees, -76), 78);
    labelPos =
        new Position(
            Angle.fromDegrees(labelLatDegrees), labelPos.getLongitude().normalizedLongitude(), 0);

    if (vs != null) {
      for (GridElement ge : this.gridElements) {
        if (ge.isInView(dc)) {
          if (ge.renderable instanceof GeographicText) {
            GeographicText gt = (GeographicText) ge.renderable;
            if (labelPos.getLatitude().degrees < 72
                || "*32*34*36*".indexOf("*" + gt.getText() + "*") == -1) {
              // Adjust label position according to eye position
              Position pos = gt.getPosition();
              if (ge.type.equals(GridElement.TYPE_LATITUDE_LABEL))
                pos =
                    Position.fromDegrees(
                        pos.getLatitude().degrees,
                        labelPos.getLongitude().degrees,
                        pos.getElevation());
              else if (ge.type.equals(GridElement.TYPE_LONGITUDE_LABEL))
                pos =
                    Position.fromDegrees(
                        labelPos.getLatitude().degrees,
                        pos.getLongitude().degrees,
                        pos.getElevation());

              gt.setPosition(pos);
            }
          }

          this.graticuleSupport.addRenderable(ge.renderable, GRATICULE_UTM);
        }
      }
      // System.out.println("Total elements: " + count + " visible sector: " + vs);
    }
  }
 private Iterable<GeographicText> makeIterable(DrawContext dc) {
   // get dispay dist for this service for use in label annealing
   double maxDisplayDistance = this.getPlaceNameService().getMaxDisplayDistance();
   ArrayList<GeographicText> list = new ArrayList<GeographicText>();
   for (int i = 0; i < this.numEntries; i++) {
     CharSequence str = getText(i);
     Position pos = getPosition(i);
     GeographicText text = new UserFacingText(str, pos);
     text.setFont(this.placeNameService.getFont());
     text.setColor(this.placeNameService.getColor());
     text.setBackgroundColor(this.placeNameService.getBackgroundColor());
     text.setVisible(isNameVisible(dc, this.placeNameService, pos));
     text.setPriority(maxDisplayDistance);
     list.add(text);
   }
   return list;
 }
    public void createRenderables() {
      this.gridElements = new ArrayList<GridElement>();

      ArrayList<Position> positions = new ArrayList<Position>();
      Position p1, p2;
      Object polyline;
      Sector lineSector;

      // left segment
      positions.clear();
      if (this.isTruncated) {
        computeTruncatedSegment(sw, nw, this.UTMZoneSector, positions);
      } else {
        positions.add(sw);
        positions.add(nw);
      }
      if (positions.size() > 0) {
        p1 = positions.get(0);
        p2 = positions.get(1);
        polyline = createLineRenderable(positions, Polyline.GREAT_CIRCLE);
        lineSector = Sector.boundingSector(p1, p2);
        GridElement ge = new GridElement(lineSector, polyline, GridElement.TYPE_LINE_WEST);
        ge.setValue(this.SWEasting);
        this.gridElements.add(ge);
      }

      // right segment
      positions.clear();
      if (this.isTruncated) {
        computeTruncatedSegment(se, ne, this.UTMZoneSector, positions);
      } else {
        positions.add(se);
        positions.add(ne);
      }
      if (positions.size() > 0) {
        p1 = positions.get(0);
        p2 = positions.get(1);
        polyline = createLineRenderable(positions, Polyline.GREAT_CIRCLE);
        lineSector = Sector.boundingSector(p1, p2);
        GridElement ge = new GridElement(lineSector, polyline, GridElement.TYPE_LINE_EAST);
        ge.setValue(this.SWEasting + this.size);
        this.gridElements.add(ge);
      }

      // bottom segment
      positions.clear();
      if (this.isTruncated) {
        computeTruncatedSegment(sw, se, this.UTMZoneSector, positions);
      } else {
        positions.add(sw);
        positions.add(se);
      }
      if (positions.size() > 0) {
        p1 = positions.get(0);
        p2 = positions.get(1);
        polyline = createLineRenderable(positions, Polyline.GREAT_CIRCLE);
        lineSector = Sector.boundingSector(p1, p2);
        GridElement ge = new GridElement(lineSector, polyline, GridElement.TYPE_LINE_SOUTH);
        ge.setValue(this.SWNorthing);
        this.gridElements.add(ge);
      }

      // top segment
      positions.clear();
      if (this.isTruncated) {
        computeTruncatedSegment(nw, ne, this.UTMZoneSector, positions);
      } else {
        positions.add(nw);
        positions.add(ne);
      }
      if (positions.size() > 0) {
        p1 = positions.get(0);
        p2 = positions.get(1);
        polyline = createLineRenderable(positions, Polyline.GREAT_CIRCLE);
        lineSector = Sector.boundingSector(p1, p2);
        GridElement ge = new GridElement(lineSector, polyline, GridElement.TYPE_LINE_NORTH);
        ge.setValue(this.SWNorthing + this.size);
        this.gridElements.add(ge);
      }

      // Label
      if (this.name != null) {
        // Only add a label to squares above some dimension
        if (this.boundingSector.getDeltaLon().degrees
                    * Math.cos(this.centroid.getLatitude().radians)
                > .2
            && this.boundingSector.getDeltaLat().degrees > .2) {
          LatLon labelPos = null;
          if (this.UTMZone != 0) // Not at poles
          {
            labelPos = this.centroid;
          } else if (this.isPositionInside(new Position(this.squareCenter, 0))) {
            labelPos = this.squareCenter;
          } else if (this.squareCenter.getLatitude().degrees
                  <= this.UTMZoneSector.getMaxLatitude().degrees
              && this.squareCenter.getLatitude().degrees
                  >= this.UTMZoneSector.getMinLatitude().degrees) {
            labelPos = this.centroid;
          }
          if (labelPos != null) {
            GeographicText text = new UserFacingText(this.name, new Position(labelPos, 0));
            text.setPriority(this.size * 10);
            this.gridElements.add(
                new GridElement(this.boundingSector, text, GridElement.TYPE_GRIDZONE_LABEL));
          }
        }
      }
    }
    public void selectRenderables(DrawContext dc) {
      try {
        OrbitView view = (OrbitView) dc.getView();
        // Compute easting and northing label offsets
        Double pixelSize = view.computePixelSizeAtDistance(view.getZoom());
        Double eastingOffset = view.getViewport().width * pixelSize * offsetFactorX / 2;
        Double northingOffset = view.getViewport().height * pixelSize * offsetFactorY / 2;
        // Derive labels center pos from the view center
        Position centerPos = view.getCenterPosition();
        double labelEasting;
        double labelNorthing;
        String labelHemisphere;
        if (this.zone > 0) {
          UTMCoord UTM =
              UTMCoord.fromLatLon(centerPos.getLatitude(), centerPos.getLongitude(), dc.getGlobe());
          labelEasting = UTM.getEasting() + eastingOffset;
          labelNorthing = UTM.getNorthing() + northingOffset;
          labelHemisphere = UTM.getHemisphere();
          if (labelNorthing < 0) {
            labelNorthing = 10e6 + labelNorthing;
            labelHemisphere = AVKey.SOUTH;
          }
        } else {
          UPSCoord UPS =
              UPSCoord.fromLatLon(centerPos.getLatitude(), centerPos.getLongitude(), dc.getGlobe());
          labelEasting = UPS.getEasting() + eastingOffset;
          labelNorthing = UPS.getNorthing() + northingOffset;
          labelHemisphere = UPS.getHemisphere();
        }

        Position labelPos;
        for (int i = 0; i < this.extremes.length; i++) {
          UTMExtremes levelExtremes = this.extremes[i];
          double gridStep = Math.pow(10, i);
          double gridStepTimesTen = gridStep * 10;
          String graticuleType = getTypeFor((int) gridStep);
          if (levelExtremes.minX <= levelExtremes.maxX) {
            // Process easting scale labels for this level
            for (double easting = levelExtremes.minX;
                easting <= levelExtremes.maxX;
                easting += gridStep) {
              // Skip multiples of ten grid steps except for last (higher) level
              if (i == this.extremes.length - 1 || easting % gridStepTimesTen != 0) {
                try {
                  labelPos = computePosition(this.zone, labelHemisphere, easting, labelNorthing);
                  if (labelPos == null) continue;
                  Angle lat = labelPos.getLatitude();
                  Angle lon = labelPos.getLongitude();
                  Vec4 surfacePoint = getSurfacePoint(dc, lat, lon);
                  if (viewFrustum.contains(surfacePoint) && isPointInRange(dc, surfacePoint)) {
                    String text = String.valueOf((int) (easting % this.scaleModulo));
                    GeographicText gt = new UserFacingText(text, new Position(lat, lon, 0));
                    gt.setPriority(gridStepTimesTen);
                    addRenderable(gt, graticuleType);
                  }
                } catch (IllegalArgumentException ignore) {
                }
              }
            }
          }
          if (!(levelExtremes.maxYHemisphere.equals(AVKey.SOUTH) && levelExtremes.maxY == 0)) {
            // Process northing scale labels for this level
            String currentHemisphere = levelExtremes.minYHemisphere;
            for (double northing = levelExtremes.minY;
                (northing <= levelExtremes.maxY)
                    || !currentHemisphere.equals(levelExtremes.maxYHemisphere);
                northing += gridStep) {
              // Skip multiples of ten grid steps except for last (higher) level
              if (i == this.extremes.length - 1 || northing % gridStepTimesTen != 0) {
                try {
                  labelPos = computePosition(this.zone, currentHemisphere, labelEasting, northing);
                  if (labelPos == null) continue;
                  Angle lat = labelPos.getLatitude();
                  Angle lon = labelPos.getLongitude();
                  Vec4 surfacePoint = getSurfacePoint(dc, lat, lon);
                  if (viewFrustum.contains(surfacePoint) && isPointInRange(dc, surfacePoint)) {
                    String text = String.valueOf((int) (northing % this.scaleModulo));
                    GeographicText gt = new UserFacingText(text, new Position(lat, lon, 0));
                    gt.setPriority(gridStepTimesTen);
                    addRenderable(gt, graticuleType);
                  }
                } catch (IllegalArgumentException ignore) {
                }

                if (!currentHemisphere.equals(levelExtremes.maxYHemisphere)
                    && northing >= 10e6 - gridStep) {
                  // Switch hemisphere
                  currentHemisphere = levelExtremes.maxYHemisphere;
                  northing = -gridStep;
                }
              }
            }
          } // end northing
        } // for levels
      } catch (IllegalArgumentException ignore) {
      }
    }