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/*
 * Copyright (c) 1998 - 2011. University Corporation for Atmospheric Research/Unidata
 * Portions of this software were developed by the Unidata Program at the
 * University Corporation for Atmospheric Research.
 *
 * Access and use of this software shall impose the following obligations
 * and understandings on the user. The user is granted the right, without
 * any fee or cost, to use, copy, modify, alter, enhance and distribute
 * this software, and any derivative works thereof, and its supporting
 * documentation for any purpose whatsoever, provided that this entire
 * notice appears in all copies of the software, derivative works and
 * supporting documentation.  Further, UCAR requests that the user credit
 * UCAR/Unidata in any publications that result from the use of this
 * software or in any product that includes this software. The names UCAR
 * and/or Unidata, however, may not be used in any advertising or publicity
 * to endorse or promote any products or commercial entity unless specific
 * written permission is obtained from UCAR/Unidata. The user also
 * understands that UCAR/Unidata is not obligated to provide the user with
 * any support, consulting, training or assistance of any kind with regard
 * to the use, operation and performance of this software nor to provide
 * the user with any updates, revisions, new versions or "bug fixes."
 *
 * THIS SOFTWARE IS PROVIDED BY UCAR/UNIDATA "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL UCAR/UNIDATA BE LIABLE FOR ANY SPECIAL,
 * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE ACCESS, USE OR PERFORMANCE OF THIS SOFTWARE.
 */

package ucar.unidata.geoloc;

import ucar.unidata.util.Parameter;

/**
 * Projective geometry transformations from (lat,lon) to (x,y) on
 * a projective cartesian surface. We use the java.awt.geom 2D classes
 * to represent the coordinates on the projective plane.
 *
 * @author John Caron
 */

public interface Projection {

  /**
   * The name of this class of projections, eg "Transverse Mercator".
   *
   * @return the class name
   */
  public String getClassName();

  /**
   * The name of this projection.
   *
   * @return the name of this projection
   */
  public String getName();

  /**
   * String representation of the projection parameters.
   *
   * @return String representation of the projection parameters.
   */
  public String paramsToString();

  /**
   * Convert a LatLonPoint to projection coordinates.  Note: do not assume
   * a new object is created on each call for the return value.
   *
   * @param latlon convert from these lat, lon coordinates
   * @param result point to put result in
   * @return ProjectionPoint convert to these projection coordinates
   */
  public ProjectionPoint latLonToProj(LatLonPoint latlon, ProjectionPointImpl result);

  /**
   * Convert projection coordinates to a LatLonPoint.
   * Note: do not assume a new object is created on each call for the
   * return value.
   *
   * @param ppt    convert from these projection coordinates
   * @param result return result here, or null
   * @return lat/lon coordinates
   */
  public LatLonPoint projToLatLon(ProjectionPoint ppt, LatLonPointImpl result);

  /**
   * Does the line between these two points cross the projection "seam", which
   * is a discontinuity in the function latlon <-> projection plane
   *
   * @param pt1 the line goes between these two points
   * @param pt2 the line goes between these two points
   * @return false if there is no seam, or the line does not cross it.
   */
  public boolean crossSeam(ProjectionPoint pt1, ProjectionPoint pt2);

  /**
   * Get a reasonable bounding box in this projection.
   * Projections are typically specific to an area of the world;
   * theres no bounding box that works for all projections.
   *
   * @return a reasonable bounding box in this projection.
   */
  public ProjectionRect getDefaultMapArea();

  /**
   * Check for equality with the object in question
   *
   * @param proj projection to check
   * @return true if this represents the same Projection as proj.
   */
  public boolean equals(Object proj);

  /**
   * Get parameters as list of ucar.unidata.util.Parameter
   *
   * @return List of parameters
   */
  public java.util.List getProjectionParameters();

}