Android Open Source - WhatsUp Geo Point Util

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License

The source code is released under:

GNU General Public License

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Java Source Code

package nu.placebo.whatsup.util;
/*w  w  w. java 2s  .c  om*/
import android.os.Bundle;

import com.google.android.maps.GeoPoint;

public class GeoPointUtil {

  /**
   * Converts two GeoPoints and delivers an array with decimal degree doubles
   * in the order:
   * 
   * minLat, minLong, maxLat, maxLong
   * 
   * The coordinates will be ordered in this manner regardless of which
   * coordinate belongs to which GeoPoint
   * 
   * @param a
   * @param b
   * @return [minLat, minLong, maxLat, maxLong]
   */
  public static double[] convertAreaToDoubles(GeoPoint a, GeoPoint b) {
    double[] result = new double[4];

    result[0] = ((double) Math.min(a.getLatitudeE6(), b.getLatitudeE6())) / 1000000;
    result[1] = ((double) Math.min(a.getLongitudeE6(), b.getLongitudeE6())) / 1000000;
    result[2] = ((double) Math.max(a.getLatitudeE6(), b.getLatitudeE6())) / 1000000;
    result[3] = ((double) Math.max(a.getLongitudeE6(), b.getLongitudeE6())) / 1000000;

    return result;
  }

  /**
   * Converts a single GeoPoint to an array of decimal degree doubles
   * 
   * 
   * @param a
   * @return [lat, long]
   */
  public static double[] convertGeoPointToDoubles(GeoPoint a) {
    double[] result = new double[2];

    result[0] = ((double) a.getLatitudeE6()) / 1000000;
    result[1] = ((double) a.getLongitudeE6()) / 1000000;

    return result;
  }

  /**
   * Creates two GeoPoints with the center of the map, latitude span and longitude span
   * 
   * @param center - center of the current mapview
   * @param latSpan - latitude span from bottom to top
   * @param longSpan - longitude span from left to right
   * @return GeoPoint[] with two GeoPoints representing the bottom-left and top-right coordinates 
   */
  public static GeoPoint[] getBottomLeftToTopRightPoints(GeoPoint center,  int latSpan, int longSpan) {
    int bottom = center.getLatitudeE6() - (latSpan / 2);
    int top = center.getLatitudeE6() + (latSpan / 2);
    int left = center.getLongitudeE6() - (longSpan / 2);
    int right = center.getLongitudeE6() + (longSpan / 2);
    return new GeoPoint[] { new GeoPoint(bottom, left), new GeoPoint(top, right) };
  }

  /**
   * Convenience method for packing a GeoPoint in a Bundle (android.os)
   * 
   * 
   * 
   * @see #popGeoPoint(Bundle)
   * @see #bundleHasGeoPoint(Bundle)
   * @param p
   * @return Bundle with packaged GeoPoint
   */
  public static Bundle pushGeoPoint(GeoPoint p) {
    Bundle bundle = new Bundle();
    bundle.putInt("lat", p.getLatitudeE6());
    bundle.putInt("long", p.getLongitudeE6());

    return bundle;
  }

  /**
   * Convenience method for unpacking a GeoPoint from a android.os.Bundle bundle must be
   * packed according to local standards.
   * 
   * @param bundle
   * @return GeoPoint
   */
  public static GeoPoint popGeoPoint(Bundle bundle) {
    GeoPoint p = new GeoPoint(bundle.getInt("lat"), bundle.getInt("long"));

    return p;
  }

  /**
   * Returns whether the bundle contains a properly packaged GeoPoint
   * according to local standards.
   * 
   * @param b
   * @return
   */
  public static boolean bundleHasGeoPoint(Bundle b) {
    return b.containsKey("lat") && b.containsKey("long");
  }
}

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