package org.opentrafficsim.base.geometry;
   
   import java.util.List;
   
   import org.djutils.draw.bounds.Bounds;
   import org.djutils.draw.line.PolyLine2d;
   import org.djutils.draw.line.Polygon2d;
   import org.djutils.draw.point.Point2d;
   
  /**
   * Creates bounds that are at least 2m of size in the x and y direction, useful for animation objects a user may click on.
   * <p>
   * Copyright (c) 2023-2024 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
   * BSD-style license. See <a href="https://opentrafficsim.org/docs/license.html">OpenTrafficSim License</a>.
   * </p>
   * @author <a href="https://github.com/averbraeck">Alexander Verbraeck</a>
   * @author <a href="https://tudelft.nl/staff/p.knoppers-1">Peter Knoppers</a>
   * @author <a href="https://github.com/wjschakel">Wouter Schakel</a>
   */
  public class ClickableBounds
  {
  
      /** Minimum distance from center to edge. */
      private static double R_MIN = 1.0;
  
      /**
       * Constructor.
       */
      private ClickableBounds()
      {
          // utility class
      }
  
      /**
       * Creates bounds that are at least 2m of size in the x and y direction.
       * @param bounds Bounds&lt;?, ?, ?&gt;; actual object bounds.
       * @return Bounds&lt;?, ?, ?&gt;; bounds that are at least 2m of size in the x and y direction.
       */
      public static OtsBounds2d get(final Bounds<?, ?, ?> bounds)
      {
          if (bounds.getDeltaX() < 2 * R_MIN)
          {
              double x = (bounds.getMinX() + bounds.getMaxX()) / 2.0;
              if (bounds.getDeltaY() < 2 * R_MIN)
              {
                  double y = (bounds.getMinY() + bounds.getMaxY()) / 2.0;
                  return new BoundingRectangle(x - R_MIN, x + R_MIN, y - R_MIN, y + R_MIN);
              }
              return new BoundingRectangle(x - R_MIN, x + R_MIN, bounds.getMinY(), bounds.getMaxY());
          }
          if (bounds.getDeltaY() < 2 * R_MIN)
          {
              double y = (bounds.getMinY() + bounds.getMaxY()) / 2.0;
              return new BoundingRectangle(bounds.getMinX(), bounds.getMaxX(), y - R_MIN, y + R_MIN);
          }
          return new BoundingRectangle(bounds.getMinX(), bounds.getMaxX(), bounds.getMinY(), bounds.getMaxY());
      }
  
      /**
       * Creates bounds that are clickable from a line, generating an area of 2m wide.
       * @param flattenedLine PolyLine2d; line.
       * @return BoundingPolygon; bounding polygon.
       */
      public static BoundingPolygon get(final PolyLine2d flattenedLine)
      {
          PolyLine2d left = flattenedLine.offsetLine(R_MIN);
          PolyLine2d right = flattenedLine.offsetLine(-R_MIN);
          List<Point2d> points = left.getPointList();
          points.addAll(right.reverse().getPointList());
          return new BoundingPolygon(new Polygon2d(points));
      }
  
  }