/* Copyright 2013-2025 CS GROUP
    * Licensed to CS GROUP (CS) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * CS licenses this file to You under the Apache License, Version 2.0
    * (the "License"); you may not use this file except in compliance with
    * the License.  You may obtain a copy of the License at
    *
    *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.orekit.rugged.raster;
  
  import org.hipparchus.util.FastMath;
  
  public class CheckedPatternElevationUpdater implements TileUpdater {
  
      private double size;
      private int    n;
      private double elevation1;
      private double elevation2;
  
      public CheckedPatternElevationUpdater(double size, int n, double elevation1, double elevation2) {
          this.size       = size;
          this.n          = n;
          this.elevation1 = elevation1;
          this.elevation2 = elevation2;
      }
  
      public void updateTile(double latitude, double longitude, UpdatableTile tile) {
          
          double step         = size / (n - 1);
          double minLatitude  = size * FastMath.floor(latitude  / size);
          double minLongitude = size * FastMath.floor(longitude / size);
          tile.setGeometry(minLatitude, minLongitude, step, step, n, n);
          for (int i = 0; i < n; ++i) {
              int p = (int) FastMath.floor((minLatitude + i * step) / step);
              for (int j = 0; j < n; ++j) {
                  int q = (int) FastMath.floor((minLongitude + j * step) / step);
                  tile.setElevation(i, j, (((p ^ q) & 0x1) == 0) ? elevation1 : elevation2);
              }
          }
      }
  
  }