private void drawTileIDs(DrawContext dc, ArrayList<MercatorTextureTile> tiles) {
    java.awt.Rectangle viewport = dc.getView().getViewport();
    if (this.textRenderer == null) {
      this.textRenderer = new TextRenderer(java.awt.Font.decode("Arial-Plain-13"), true, true);
      this.textRenderer.setUseVertexArrays(false);
    }

    dc.getGL().glDisable(GL.GL_DEPTH_TEST);
    dc.getGL().glDisable(GL.GL_BLEND);
    dc.getGL().glDisable(GL.GL_TEXTURE_2D);

    this.textRenderer.setColor(java.awt.Color.YELLOW);
    this.textRenderer.beginRendering(viewport.width, viewport.height);
    for (MercatorTextureTile tile : tiles) {
      String tileLabel = tile.getLabel();

      if (tile.getFallbackTile() != null) tileLabel += "/" + tile.getFallbackTile().getLabel();

      LatLon ll = tile.getSector().getCentroid();
      Vec4 pt =
          dc.getGlobe()
              .computePointFromPosition(
                  ll.getLatitude(),
                  ll.getLongitude(),
                  dc.getGlobe().getElevation(ll.getLatitude(), ll.getLongitude()));
      pt = dc.getView().project(pt);
      this.textRenderer.draw(tileLabel, (int) pt.x, (int) pt.y);
    }
    this.textRenderer.endRendering();
  }
 private boolean isTileVisible(DrawContext dc, MercatorTextureTile tile) {
   //        if (!(tile.getExtent(dc).intersects(dc.getView().getFrustumInModelCoordinates())
   //            && (dc.getVisibleSector() == null ||
   // dc.getVisibleSector().intersects(tile.getSector()))))
   //            return false;
   //
   //        Position eyePos = dc.getView().getEyePosition();
   //        LatLon centroid = tile.getSector().getCentroid();
   //        Angle d = LatLon.greatCircleDistance(eyePos.getLatLon(), centroid);
   //        if ((!tile.getLevelName().equals("0")) &&
   // d.compareTo(tile.getSector().getDeltaLat().multiply(2.5)) == 1)
   //            return false;
   //
   //        return true;
   //
   return tile.getExtent(dc).intersects(dc.getView().getFrustumInModelCoordinates())
       && (dc.getVisibleSector() == null || dc.getVisibleSector().intersects(tile.getSector()));
 }
  public BufferedImage composeImageForSector(
      Sector sector,
      int imageWidth,
      int imageHeight,
      int levelNumber,
      String mimeType,
      boolean abortOnError,
      BufferedImage image) {
    if (sector == null) {
      String message = Logging.getMessage("nullValue.SectorIsNull");
      Logging.logger().severe(message);
      throw new IllegalStateException(message);
    }

    if (levelNumber < 0) {
      levelNumber = this.levels.getLastLevel().getLevelNumber();
    } else if (levelNumber > this.levels.getLastLevel().getLevelNumber()) {
      Logging.logger()
          .warning(
              Logging.getMessage(
                  "generic.LevelRequestedGreaterThanMaxLevel",
                  levelNumber,
                  this.levels.getLastLevel().getLevelNumber()));
      levelNumber = this.levels.getLastLevel().getLevelNumber();
    }

    MercatorTextureTile[][] tiles = this.getTilesInSector(sector, levelNumber);

    if (tiles.length == 0 || tiles[0].length == 0) {
      Logging.logger().severe(Logging.getMessage("layers.TiledImageLayer.NoImagesAvailable"));
      return null;
    }

    if (image == null)
      image = new BufferedImage(imageWidth, imageHeight, BufferedImage.TYPE_INT_RGB);

    Graphics2D g = image.createGraphics();

    for (MercatorTextureTile[] row : tiles) {
      for (MercatorTextureTile tile : row) {
        if (tile == null) continue;

        BufferedImage tileImage;
        try {
          tileImage = this.getImage(tile, mimeType);

          double sh =
              ((double) imageHeight / (double) tileImage.getHeight())
                  * (tile.getSector().getDeltaLat().divide(sector.getDeltaLat()));
          double sw =
              ((double) imageWidth / (double) tileImage.getWidth())
                  * (tile.getSector().getDeltaLon().divide(sector.getDeltaLon()));

          double dh =
              imageHeight
                  * (-tile.getSector().getMaxLatitude().subtract(sector.getMaxLatitude()).degrees
                      / sector.getDeltaLat().degrees);
          double dw =
              imageWidth
                  * (tile.getSector().getMinLongitude().subtract(sector.getMinLongitude()).degrees
                      / sector.getDeltaLon().degrees);

          AffineTransform txf = g.getTransform();
          g.translate(dw, dh);
          g.scale(sw, sh);
          g.drawImage(tileImage, 0, 0, null);
          g.setTransform(txf);
        } catch (Exception e) {
          if (abortOnError) throw new RuntimeException(e);

          String message =
              Logging.getMessage("generic.ExceptionWhileRequestingImage", tile.getPath());
          Logging.logger().log(java.util.logging.Level.WARNING, message, e);
        }
      }
    }

    return image;
  }
 private boolean meetsRenderCriteria(DrawContext dc, MercatorTextureTile tile) {
   return this.levels.isFinalLevel(tile.getLevelNumber()) || !needToSplit(dc, tile.getSector());
 }