/*
 *   Written by Pieter @  android-developers on groups.google.com
 * 
 *   This file is part of OpenGPSTracker.
 *
 *   OpenGPSTracker is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   OpenGPSTracker is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with OpenGPSTracker.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
package nl.sogeti.android.gpstracker.viewer;

import nl.sogeti.android.gpstracker.R;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Point;
import android.graphics.drawable.Drawable;
import android.location.Location;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapView;
import com.google.android.maps.MyLocationOverlay;
import com.google.android.maps.Projection;

/**
 * Fix for a ClassCastException found on some Google Maps API's implementations.
 * @see <a href="http://www.spectrekking.com/download/FixedMyLocationOverlay.java">www.spectrekking.com</a> 
 * @version $Id: FixedMyLocationOverlay.java 888 2011-03-14 19:44:44Z rcgroot@gmail.com $
 */
public class FixedMyLocationOverlay extends MyLocationOverlay {
   private boolean bugged = false;

   private Paint accuracyPaint;
   private Point center;
   private Point left;
   private Drawable drawable;
   private int width;
   private int height;

   public FixedMyLocationOverlay(Context context, MapView mapView) {
      super(context, mapView);
   }

   @Override
   protected void drawMyLocation(Canvas canvas, MapView mapView, Location lastFix, GeoPoint myLoc, long when) {
      if (!bugged) {
         try {
            super.drawMyLocation(canvas, mapView, lastFix, myLoc, when);
         } catch (Exception e) {
            bugged = true;
         }
      }

      if (bugged) {
         if (drawable == null) {
            if( accuracyPaint == null )
            {
               accuracyPaint = new Paint();
               accuracyPaint.setAntiAlias(true);
               accuracyPaint.setStrokeWidth(2.0f);
            }
            drawable = mapView.getContext().getResources().getDrawable(R.drawable.mylocation);
            width = drawable.getIntrinsicWidth();
            height = drawable.getIntrinsicHeight();
            center = new Point();
            left = new Point();
         }
         Projection projection = mapView.getProjection();
         
         double latitude = lastFix.getLatitude();
         double longitude = lastFix.getLongitude();
         float accuracy = lastFix.getAccuracy();
         
         float[] result = new float[1];

         Location.distanceBetween(latitude, longitude, latitude, longitude + 1, result);
         float longitudeLineDistance = result[0];

         GeoPoint leftGeo = new GeoPoint((int)(latitude*1e6), (int)((longitude-accuracy/longitudeLineDistance)*1e6));
         projection.toPixels(leftGeo, left);
         projection.toPixels(myLoc, center);
         int radius = center.x - left.x;
         
         accuracyPaint.setColor(0xff6666ff);
         accuracyPaint.setStyle(Style.STROKE);
         canvas.drawCircle(center.x, center.y, radius, accuracyPaint);

         accuracyPaint.setColor(0x186666ff);
         accuracyPaint.setStyle(Style.FILL);
         canvas.drawCircle(center.x, center.y, radius, accuracyPaint);
                  
         drawable.setBounds(center.x - width / 2, center.y - height / 2, center.x + width / 2, center.y + height / 2);
         drawable.draw(canvas);
      }
   }

}